Class / Patent application number | Description | Number of patent applications / Date published |
330207000 | MISCELLANEOUS | 23 |
20090091384 | Systems and methods of RF power transmission, modulation and amplification - Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion. | 04-09-2009 |
20100289577 | Cascade Voltage Amplifier and Method of Activating Cascaded Electron Tubes - Disclosed is a cascade voltage amplifier for producing an amplified output in pulse or continuous wave form comprises at least one non-final stage with an electron tube configured as a switching and Class A or C amplifying structure. A final stage comprises an electron tube configured as a Class A or C amplifying structure. The at least one non-final stage and the final stage are connected in series, and the amplified output has a voltage of at least 1000 volts. Further disclosed is a method of activating a plurality of cascaded electron tube stages within a common vacuum enclosure. Beneficially, a sufficient amount of energy supplied to the first stage serially propagates through any intervening stage to the final stage so as to facilitate activation of all tube stages. | 11-18-2010 |
20110121899 | POWER AMPLIFIER, NON-LINEAR DISTORTION CORRECTING METHOD OF POWER AMPLIFIER AND RADIO COMMUNICATION DEVICE - The invention intends to supply a power amplifier enable to correct a distortion correctly by linealizer corresponding to each amplifier if plural amplifiers are used at any operation points. A power amplifier according to the invention includes a plurality of amplifiers | 05-26-2011 |
20110279180 | POWER AMPLIFIER AND POWER AMPLIFYING METHOD - An aspect of a power amplifier according to the present invention is a power amplifier that amplifies a modulated signal including amplitude modulated components and phase modulated components, the power amplifier including a first voltage source | 11-17-2011 |
20120075021 | WIDEBAND LOW NOISE SENSOR AMPLIFIER CIRCUIT - A circuit having a sensor with a stray capacitance value. An output from the sensor is connected to the input of an amplifier while a negative capacitance circuit is electrically connected in parallel with the sensor output. The negative capacitance circuit reduces the effect of the sensor stray capacitance to provide an increased bandwidth and decreased noise on the amplifier output. | 03-29-2012 |
20120133435 | Amplification Circuit, Electronic Device, Amplification Method - In one embodiment, there is provided an amplification circuit. The amplification circuit includes: a plurality of amplifiers configured to amplify an input signal and output the amplified signal; a control circuit configured to control a current supplied to each of the plurality of amplifiers; and a switching circuit configured to switch the amplified signal output from the plurality of amplifiers in response to current control performed by the control circuit. | 05-31-2012 |
20100102880 | LOAD DRIVE DEVICE - A load drive device has a load drive unit including an input system electrically connectable to a control power supply and an output system electrically connectable to a load drive power supply. The load drive unit supplies the electrical load with load drive voltage from the load drive power supply via the output system when the control power supply applies control voltage to the input system. A potential difference detection unit detects a potential difference between the control voltage and the load drive voltage. A potential fixing unit fixes a potential at a control system electrical route, connecting the control power supply and the input system of the load drive unit, to a prohibition level that prohibits the output system of the load drive unit from driving the electrical load when the potential difference detected by the potential difference detection unit exceeds a predetermined threshold value. | 04-29-2010 |
20100295614 | AMPLIFYING DEVICE - An amplifying device for setting input impedance at several GΩ to several tens of GΩ and improving an ESD withstand current rating is provided. | 11-25-2010 |
20110128076 | Managing Power Supply Transients - In one embodiment, an apparatus includes a voltage regulator, an amplifier, and control logic. The regulator may receive a supply voltage and output a regulated voltage to an intermediate node. In turn, the amplifier is to be powered by the regulated voltage, while the control logic is coupled to the voltage regulator to cause a change in the regulated voltage to a safe voltage before one or more gain stages of the amplifier is to be coupled to or decoupled from an output signal path. | 06-02-2011 |
20120075020 | NETWORK COMMUNICATION DEVICE AND METHOD FOR DETECTING ABNORMAL LOAD - A network communication device includes a processor, an amplifier circuit, a matching circuit including a transmitting route and a coupling route, a storage module, and a detection and control module. The network communication device generate electronic signals, and outputs the electronic signals to a load via the transmitting route after the electronic signals being amplified and matched. Then the network communication device detects output signals and reflection signals of the coupling route to calculate a safety parameter accordingly, compares the calculated safety parameter with one or more safety parameter thresholds, and generates control signals to control the amplifier circuit. The network communication device determines if the load is abnormal according to the control signals and generates load abnormal signals if the load is abnormal. | 03-29-2012 |
20090102556 | CLASS D AMPLIFIER - A Class D amplifier includes a ramp generator that generates a ramp signal and an inverted ramp signal. A signal generator generates first, second, third and fourth signals by comparing the ramp and inverted ramp signals to an input signal. A frequency of the ramp signal is approximately two orders of magnitude higher than a frequency of the input signal. The signal generator transitions from a first state to a second state of a first control signal after one of the first and second signals occurs, transitions from a first state to a second state of a second control signal after one of the third and fourth signals occurs, and transitions from the second state to the first state of one of the first and second control signals when the other of the first and second control signals transitions to the second state. An output stage includes first and second switches that are controlled based on the first and second control signals, respectively, and generates output current based on the first and second control signals. | 04-23-2009 |
20100019845 | SWITCHING POWER AMPLIFIER FOR QUANTIZED SIGNALS - An apparatus and method for communications are disclosed. The apparatus may include an a quantizer having three levels, and a switching power amplifier configured to drive a load having first and second terminals, wherein the switching power amplifier is further configured to switch the first and second terminals between first and second power rails only if the output from the quantizer is at one of the three levels. | 01-28-2010 |
20100134185 | AUDIO AMPLIFIER - An audio amplifier including a differential mode integrator, a first comparator, a second comparator, a logic circuit and a driving unit is provided. The differential mode integrator receives a differential input signal and a differential output signal and outputs a differential mode intermediate signal. The first comparator has a positive input terminal receiving a first terminal signal of the differential mode intermediate signal, a negative input terminal receiving a ramp signal, and generates a first signal. The second comparator has a positive input terminal receiving a ramp signal, a negative input terminal receiving a second terminal signal of the differential mode intermediate signal, and generates a second signal. The logic circuit performs a logic operation on the first and second signals to generate a third signal and a fourth signal. The driving unit generates a differential output signal to drive a load according to the third and fourth signals. | 06-03-2010 |
20100315163 | Class D Power Amplifier - A class D power amplifier includes: a signal input terminal for receiving an analog signal; an analog signal processing unit for amplifying the analog signal; an integrating circuit for integrating the analog signal received from analog signal processing unit; a PWM circuit for providing pulse width modulation to an integration signal received from the integrating circuit, and outputting a resulting pulse width modulation signal having a duty ratio falling within a first duty ratio range; a duty ratio adjusting circuit for adjusting the pulse width modulation signal, received from the PWM circuit, to have a pulse width falling within a second duty ratio range narrower than the first duty ratio range; a first driver and a second driver each for processing the pulse width modulation signal received from the duty ratio adjusting circuit; and power transistors. | 12-16-2010 |
20110043283 | VARIABLE FREQUENCY CLASS-D AMPLIFIER, CONTROL METHOD THEREOF, AND RAMP GENERATOR THEREFOR - A class-D amplifier includes a ramp generator to provide a ramp signal having a frequency varying with an audio input signal, and a modulator to convert the audio input signal to a pulse width modulation signal according to the ramp signal for a driver to drive a load device. The varying frequency of the ramp signal will cause the frequency of the pulse width modulation signal unfixed and consequently improves EMI issue. | 02-24-2011 |
20110221529 | CLASS D AMPLIFIER - A class D amplifier includes an amplifier that generates a digital signal for driving a load based on an input signal, an attenuator that attenuates the input signal according to an attenuation command signal, and a clip prevention controller that outputs the attenuation command signal to intermittently attenuate the input signal when the digital signal is brought into a clip state or a near-clip state. | 09-15-2011 |
20110248779 | AMPLIFIER CIRCUITRY, INTEGRATED CIRCUIT AND COMMUNICATION UNIT - Amplifier circuitry comprising a class-D amplifier for amplifying an audio input signal. The amplifier circuitry comprises sigma-delta modulation logic arranged to receive the audio input signal and to generate a modulated signal representative of the audio input signal, and an output stage arranged to generate an output signal for the amplifier circuitry. The amplifier circuitry further comprises finite impulse response, filter logic operably coupled between the modulation logic and the output stage, and having at least one zero in its transfer function arranged to substantially pass signal components within the modulated signal occurring at frequencies less than the at least one zero and to attenuate signal components within the modulated signal at frequencies greater than the at least one zero. | 10-13-2011 |
20110316625 | MIXED-SIGNAL TRANSMISSION CIRCUIT FOR SWITCHING POWER AMPLIFIERS - The invention relates to an upstream unit ( | 12-29-2011 |
20110316626 | D-CLASS AMPLIFIER - A D-class amplifier includes: a bridge circuit adapted to drive an inductive load; a power supply voltage detection section outputting a quantized power supply voltage signal indicating a power supply voltage fed to the bridge circuit; and a gain-controlled PWM section adjusting a gain in response to the quantized power supply voltage signal, amplifying the input signal in response to the gain, generating a PWM signal from the amplified input signal, and feeding the PWM signal to the bridge circuit. The power supply voltage detection section includes: an error integration section generating a quantized signal by integrating a difference between the power supply voltage and the quantized power supply voltage signal; and a digital filter removing high frequency components of the quantized signal to output the quantized power supply voltage signal. The gain-controlled PWM section controls the gain such that variations of the power supply voltage are cancelled. | 12-29-2011 |
20120013402 | Closed-loop class-d amplifier with modulated reference signal and related method - Disclosed is a closed-loop class-D amplifier circuit including a modulated reference signal generator that provides a modulated reference signal in a feed-forward path, where the reference signal is modulated corresponding to an input signal. The closed-loop class-D amplifier circuit further includes a comparator to generate a control signal based on a comparison of the modulated reference signal and a correction signal, which in turn is produced by filtering a combination of the input signal and a feedback signal. The closed-loop class-D amplifier circuit also includes a pulse generator to generate a pulse-width-modulated signal to drive an output stage of the closed-loop class-D amplifier based on the control signal. | 01-19-2012 |
20120105155 | PULSE WIDTH MODULATION CIRCUIT AND VOLTAGE-FEEDBACK CLASS-D AMPLIFIER CIRCUIT - The frequency characteristic of a voltage-feedback class-D amplifier circuit for driving an output load is improved. A triangular-wave correction circuit which compensates a gradient of a triangular wave is provided to a triangular-wave signal generator which supplies a triangular wave signal used as a PWM carrier to a comparison circuit for performing PWM modulation of an input signal. In an area where a duty of a command value for an output circuit drive becomes about 50%, a slew rate (gradient) of the triangular wave is decreased. | 05-03-2012 |
20120235742 | POWER AMPLIFIER - A power amplifier for amplifying an electric input signal in an operational frequency range and providing an output signal, comprising switching means ( | 09-20-2012 |
20130088294 | Attenuating Non-Linear Noise in An Amplifier with Alternating DC -offset Correction - An amplifier may include two or more pulse-width modulators controlling respective sets of switches to produce an amplified version of a source signal. A positive DC-offset based on the source signal may be applied to the pulse-width modulator controlling one respective set of switches, and an equal value negative DC-offset may be applied to the pulse-width modulator controlling the other respective set of switches, to provide an effective offset between the respective points in time of the rising/falling edges of the different pulse-width modulated control signals. The addition of alternating positive and negative DC-offset values doesn't affect the output load, and doesn't degrade the signal. The DC-offsets may be added at a frequency selected to be beyond the signal baseband, and the value of the small input signal level may be determined using an RMS level comparator or similar measurement technique. | 04-11-2013 |
330207000 | Class D | 13 |
20090091384 | Systems and methods of RF power transmission, modulation and amplification - Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion. | 04-09-2009 |
20100289577 | Cascade Voltage Amplifier and Method of Activating Cascaded Electron Tubes - Disclosed is a cascade voltage amplifier for producing an amplified output in pulse or continuous wave form comprises at least one non-final stage with an electron tube configured as a switching and Class A or C amplifying structure. A final stage comprises an electron tube configured as a Class A or C amplifying structure. The at least one non-final stage and the final stage are connected in series, and the amplified output has a voltage of at least 1000 volts. Further disclosed is a method of activating a plurality of cascaded electron tube stages within a common vacuum enclosure. Beneficially, a sufficient amount of energy supplied to the first stage serially propagates through any intervening stage to the final stage so as to facilitate activation of all tube stages. | 11-18-2010 |
20110121899 | POWER AMPLIFIER, NON-LINEAR DISTORTION CORRECTING METHOD OF POWER AMPLIFIER AND RADIO COMMUNICATION DEVICE - The invention intends to supply a power amplifier enable to correct a distortion correctly by linealizer corresponding to each amplifier if plural amplifiers are used at any operation points. A power amplifier according to the invention includes a plurality of amplifiers | 05-26-2011 |
20110279180 | POWER AMPLIFIER AND POWER AMPLIFYING METHOD - An aspect of a power amplifier according to the present invention is a power amplifier that amplifies a modulated signal including amplitude modulated components and phase modulated components, the power amplifier including a first voltage source | 11-17-2011 |
20120075021 | WIDEBAND LOW NOISE SENSOR AMPLIFIER CIRCUIT - A circuit having a sensor with a stray capacitance value. An output from the sensor is connected to the input of an amplifier while a negative capacitance circuit is electrically connected in parallel with the sensor output. The negative capacitance circuit reduces the effect of the sensor stray capacitance to provide an increased bandwidth and decreased noise on the amplifier output. | 03-29-2012 |
20120133435 | Amplification Circuit, Electronic Device, Amplification Method - In one embodiment, there is provided an amplification circuit. The amplification circuit includes: a plurality of amplifiers configured to amplify an input signal and output the amplified signal; a control circuit configured to control a current supplied to each of the plurality of amplifiers; and a switching circuit configured to switch the amplified signal output from the plurality of amplifiers in response to current control performed by the control circuit. | 05-31-2012 |
20100102880 | LOAD DRIVE DEVICE - A load drive device has a load drive unit including an input system electrically connectable to a control power supply and an output system electrically connectable to a load drive power supply. The load drive unit supplies the electrical load with load drive voltage from the load drive power supply via the output system when the control power supply applies control voltage to the input system. A potential difference detection unit detects a potential difference between the control voltage and the load drive voltage. A potential fixing unit fixes a potential at a control system electrical route, connecting the control power supply and the input system of the load drive unit, to a prohibition level that prohibits the output system of the load drive unit from driving the electrical load when the potential difference detected by the potential difference detection unit exceeds a predetermined threshold value. | 04-29-2010 |
20100295614 | AMPLIFYING DEVICE - An amplifying device for setting input impedance at several GΩ to several tens of GΩ and improving an ESD withstand current rating is provided. | 11-25-2010 |
20110128076 | Managing Power Supply Transients - In one embodiment, an apparatus includes a voltage regulator, an amplifier, and control logic. The regulator may receive a supply voltage and output a regulated voltage to an intermediate node. In turn, the amplifier is to be powered by the regulated voltage, while the control logic is coupled to the voltage regulator to cause a change in the regulated voltage to a safe voltage before one or more gain stages of the amplifier is to be coupled to or decoupled from an output signal path. | 06-02-2011 |
20120075020 | NETWORK COMMUNICATION DEVICE AND METHOD FOR DETECTING ABNORMAL LOAD - A network communication device includes a processor, an amplifier circuit, a matching circuit including a transmitting route and a coupling route, a storage module, and a detection and control module. The network communication device generate electronic signals, and outputs the electronic signals to a load via the transmitting route after the electronic signals being amplified and matched. Then the network communication device detects output signals and reflection signals of the coupling route to calculate a safety parameter accordingly, compares the calculated safety parameter with one or more safety parameter thresholds, and generates control signals to control the amplifier circuit. The network communication device determines if the load is abnormal according to the control signals and generates load abnormal signals if the load is abnormal. | 03-29-2012 |
20090102556 | CLASS D AMPLIFIER - A Class D amplifier includes a ramp generator that generates a ramp signal and an inverted ramp signal. A signal generator generates first, second, third and fourth signals by comparing the ramp and inverted ramp signals to an input signal. A frequency of the ramp signal is approximately two orders of magnitude higher than a frequency of the input signal. The signal generator transitions from a first state to a second state of a first control signal after one of the first and second signals occurs, transitions from a first state to a second state of a second control signal after one of the third and fourth signals occurs, and transitions from the second state to the first state of one of the first and second control signals when the other of the first and second control signals transitions to the second state. An output stage includes first and second switches that are controlled based on the first and second control signals, respectively, and generates output current based on the first and second control signals. | 04-23-2009 |
20100019845 | SWITCHING POWER AMPLIFIER FOR QUANTIZED SIGNALS - An apparatus and method for communications are disclosed. The apparatus may include an a quantizer having three levels, and a switching power amplifier configured to drive a load having first and second terminals, wherein the switching power amplifier is further configured to switch the first and second terminals between first and second power rails only if the output from the quantizer is at one of the three levels. | 01-28-2010 |
20100134185 | AUDIO AMPLIFIER - An audio amplifier including a differential mode integrator, a first comparator, a second comparator, a logic circuit and a driving unit is provided. The differential mode integrator receives a differential input signal and a differential output signal and outputs a differential mode intermediate signal. The first comparator has a positive input terminal receiving a first terminal signal of the differential mode intermediate signal, a negative input terminal receiving a ramp signal, and generates a first signal. The second comparator has a positive input terminal receiving a ramp signal, a negative input terminal receiving a second terminal signal of the differential mode intermediate signal, and generates a second signal. The logic circuit performs a logic operation on the first and second signals to generate a third signal and a fourth signal. The driving unit generates a differential output signal to drive a load according to the third and fourth signals. | 06-03-2010 |
20100315163 | Class D Power Amplifier - A class D power amplifier includes: a signal input terminal for receiving an analog signal; an analog signal processing unit for amplifying the analog signal; an integrating circuit for integrating the analog signal received from analog signal processing unit; a PWM circuit for providing pulse width modulation to an integration signal received from the integrating circuit, and outputting a resulting pulse width modulation signal having a duty ratio falling within a first duty ratio range; a duty ratio adjusting circuit for adjusting the pulse width modulation signal, received from the PWM circuit, to have a pulse width falling within a second duty ratio range narrower than the first duty ratio range; a first driver and a second driver each for processing the pulse width modulation signal received from the duty ratio adjusting circuit; and power transistors. | 12-16-2010 |
20110043283 | VARIABLE FREQUENCY CLASS-D AMPLIFIER, CONTROL METHOD THEREOF, AND RAMP GENERATOR THEREFOR - A class-D amplifier includes a ramp generator to provide a ramp signal having a frequency varying with an audio input signal, and a modulator to convert the audio input signal to a pulse width modulation signal according to the ramp signal for a driver to drive a load device. The varying frequency of the ramp signal will cause the frequency of the pulse width modulation signal unfixed and consequently improves EMI issue. | 02-24-2011 |
20110221529 | CLASS D AMPLIFIER - A class D amplifier includes an amplifier that generates a digital signal for driving a load based on an input signal, an attenuator that attenuates the input signal according to an attenuation command signal, and a clip prevention controller that outputs the attenuation command signal to intermittently attenuate the input signal when the digital signal is brought into a clip state or a near-clip state. | 09-15-2011 |
20110248779 | AMPLIFIER CIRCUITRY, INTEGRATED CIRCUIT AND COMMUNICATION UNIT - Amplifier circuitry comprising a class-D amplifier for amplifying an audio input signal. The amplifier circuitry comprises sigma-delta modulation logic arranged to receive the audio input signal and to generate a modulated signal representative of the audio input signal, and an output stage arranged to generate an output signal for the amplifier circuitry. The amplifier circuitry further comprises finite impulse response, filter logic operably coupled between the modulation logic and the output stage, and having at least one zero in its transfer function arranged to substantially pass signal components within the modulated signal occurring at frequencies less than the at least one zero and to attenuate signal components within the modulated signal at frequencies greater than the at least one zero. | 10-13-2011 |
20110316625 | MIXED-SIGNAL TRANSMISSION CIRCUIT FOR SWITCHING POWER AMPLIFIERS - The invention relates to an upstream unit ( | 12-29-2011 |
20110316626 | D-CLASS AMPLIFIER - A D-class amplifier includes: a bridge circuit adapted to drive an inductive load; a power supply voltage detection section outputting a quantized power supply voltage signal indicating a power supply voltage fed to the bridge circuit; and a gain-controlled PWM section adjusting a gain in response to the quantized power supply voltage signal, amplifying the input signal in response to the gain, generating a PWM signal from the amplified input signal, and feeding the PWM signal to the bridge circuit. The power supply voltage detection section includes: an error integration section generating a quantized signal by integrating a difference between the power supply voltage and the quantized power supply voltage signal; and a digital filter removing high frequency components of the quantized signal to output the quantized power supply voltage signal. The gain-controlled PWM section controls the gain such that variations of the power supply voltage are cancelled. | 12-29-2011 |
20120013402 | Closed-loop class-d amplifier with modulated reference signal and related method - Disclosed is a closed-loop class-D amplifier circuit including a modulated reference signal generator that provides a modulated reference signal in a feed-forward path, where the reference signal is modulated corresponding to an input signal. The closed-loop class-D amplifier circuit further includes a comparator to generate a control signal based on a comparison of the modulated reference signal and a correction signal, which in turn is produced by filtering a combination of the input signal and a feedback signal. The closed-loop class-D amplifier circuit also includes a pulse generator to generate a pulse-width-modulated signal to drive an output stage of the closed-loop class-D amplifier based on the control signal. | 01-19-2012 |
20120105155 | PULSE WIDTH MODULATION CIRCUIT AND VOLTAGE-FEEDBACK CLASS-D AMPLIFIER CIRCUIT - The frequency characteristic of a voltage-feedback class-D amplifier circuit for driving an output load is improved. A triangular-wave correction circuit which compensates a gradient of a triangular wave is provided to a triangular-wave signal generator which supplies a triangular wave signal used as a PWM carrier to a comparison circuit for performing PWM modulation of an input signal. In an area where a duty of a command value for an output circuit drive becomes about 50%, a slew rate (gradient) of the triangular wave is decreased. | 05-03-2012 |
20120235742 | POWER AMPLIFIER - A power amplifier for amplifying an electric input signal in an operational frequency range and providing an output signal, comprising switching means ( | 09-20-2012 |
20130088294 | Attenuating Non-Linear Noise in An Amplifier with Alternating DC -offset Correction - An amplifier may include two or more pulse-width modulators controlling respective sets of switches to produce an amplified version of a source signal. A positive DC-offset based on the source signal may be applied to the pulse-width modulator controlling one respective set of switches, and an equal value negative DC-offset may be applied to the pulse-width modulator controlling the other respective set of switches, to provide an effective offset between the respective points in time of the rising/falling edges of the different pulse-width modulated control signals. The addition of alternating positive and negative DC-offset values doesn't affect the output load, and doesn't degrade the signal. The DC-offsets may be added at a frequency selected to be beyond the signal baseband, and the value of the small input signal level may be determined using an RMS level comparator or similar measurement technique. | 04-11-2013 |
330207000 | Amplifier protection means | 4 |
20090091384 | Systems and methods of RF power transmission, modulation and amplification - Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion. | 04-09-2009 |
20100289577 | Cascade Voltage Amplifier and Method of Activating Cascaded Electron Tubes - Disclosed is a cascade voltage amplifier for producing an amplified output in pulse or continuous wave form comprises at least one non-final stage with an electron tube configured as a switching and Class A or C amplifying structure. A final stage comprises an electron tube configured as a Class A or C amplifying structure. The at least one non-final stage and the final stage are connected in series, and the amplified output has a voltage of at least 1000 volts. Further disclosed is a method of activating a plurality of cascaded electron tube stages within a common vacuum enclosure. Beneficially, a sufficient amount of energy supplied to the first stage serially propagates through any intervening stage to the final stage so as to facilitate activation of all tube stages. | 11-18-2010 |
20110121899 | POWER AMPLIFIER, NON-LINEAR DISTORTION CORRECTING METHOD OF POWER AMPLIFIER AND RADIO COMMUNICATION DEVICE - The invention intends to supply a power amplifier enable to correct a distortion correctly by linealizer corresponding to each amplifier if plural amplifiers are used at any operation points. A power amplifier according to the invention includes a plurality of amplifiers | 05-26-2011 |
20110279180 | POWER AMPLIFIER AND POWER AMPLIFYING METHOD - An aspect of a power amplifier according to the present invention is a power amplifier that amplifies a modulated signal including amplitude modulated components and phase modulated components, the power amplifier including a first voltage source | 11-17-2011 |
20120075021 | WIDEBAND LOW NOISE SENSOR AMPLIFIER CIRCUIT - A circuit having a sensor with a stray capacitance value. An output from the sensor is connected to the input of an amplifier while a negative capacitance circuit is electrically connected in parallel with the sensor output. The negative capacitance circuit reduces the effect of the sensor stray capacitance to provide an increased bandwidth and decreased noise on the amplifier output. | 03-29-2012 |
20120133435 | Amplification Circuit, Electronic Device, Amplification Method - In one embodiment, there is provided an amplification circuit. The amplification circuit includes: a plurality of amplifiers configured to amplify an input signal and output the amplified signal; a control circuit configured to control a current supplied to each of the plurality of amplifiers; and a switching circuit configured to switch the amplified signal output from the plurality of amplifiers in response to current control performed by the control circuit. | 05-31-2012 |
20100102880 | LOAD DRIVE DEVICE - A load drive device has a load drive unit including an input system electrically connectable to a control power supply and an output system electrically connectable to a load drive power supply. The load drive unit supplies the electrical load with load drive voltage from the load drive power supply via the output system when the control power supply applies control voltage to the input system. A potential difference detection unit detects a potential difference between the control voltage and the load drive voltage. A potential fixing unit fixes a potential at a control system electrical route, connecting the control power supply and the input system of the load drive unit, to a prohibition level that prohibits the output system of the load drive unit from driving the electrical load when the potential difference detected by the potential difference detection unit exceeds a predetermined threshold value. | 04-29-2010 |
20100295614 | AMPLIFYING DEVICE - An amplifying device for setting input impedance at several GΩ to several tens of GΩ and improving an ESD withstand current rating is provided. | 11-25-2010 |
20110128076 | Managing Power Supply Transients - In one embodiment, an apparatus includes a voltage regulator, an amplifier, and control logic. The regulator may receive a supply voltage and output a regulated voltage to an intermediate node. In turn, the amplifier is to be powered by the regulated voltage, while the control logic is coupled to the voltage regulator to cause a change in the regulated voltage to a safe voltage before one or more gain stages of the amplifier is to be coupled to or decoupled from an output signal path. | 06-02-2011 |
20120075020 | NETWORK COMMUNICATION DEVICE AND METHOD FOR DETECTING ABNORMAL LOAD - A network communication device includes a processor, an amplifier circuit, a matching circuit including a transmitting route and a coupling route, a storage module, and a detection and control module. The network communication device generate electronic signals, and outputs the electronic signals to a load via the transmitting route after the electronic signals being amplified and matched. Then the network communication device detects output signals and reflection signals of the coupling route to calculate a safety parameter accordingly, compares the calculated safety parameter with one or more safety parameter thresholds, and generates control signals to control the amplifier circuit. The network communication device determines if the load is abnormal according to the control signals and generates load abnormal signals if the load is abnormal. | 03-29-2012 |
20090102556 | CLASS D AMPLIFIER - A Class D amplifier includes a ramp generator that generates a ramp signal and an inverted ramp signal. A signal generator generates first, second, third and fourth signals by comparing the ramp and inverted ramp signals to an input signal. A frequency of the ramp signal is approximately two orders of magnitude higher than a frequency of the input signal. The signal generator transitions from a first state to a second state of a first control signal after one of the first and second signals occurs, transitions from a first state to a second state of a second control signal after one of the third and fourth signals occurs, and transitions from the second state to the first state of one of the first and second control signals when the other of the first and second control signals transitions to the second state. An output stage includes first and second switches that are controlled based on the first and second control signals, respectively, and generates output current based on the first and second control signals. | 04-23-2009 |
20100019845 | SWITCHING POWER AMPLIFIER FOR QUANTIZED SIGNALS - An apparatus and method for communications are disclosed. The apparatus may include an a quantizer having three levels, and a switching power amplifier configured to drive a load having first and second terminals, wherein the switching power amplifier is further configured to switch the first and second terminals between first and second power rails only if the output from the quantizer is at one of the three levels. | 01-28-2010 |
20100134185 | AUDIO AMPLIFIER - An audio amplifier including a differential mode integrator, a first comparator, a second comparator, a logic circuit and a driving unit is provided. The differential mode integrator receives a differential input signal and a differential output signal and outputs a differential mode intermediate signal. The first comparator has a positive input terminal receiving a first terminal signal of the differential mode intermediate signal, a negative input terminal receiving a ramp signal, and generates a first signal. The second comparator has a positive input terminal receiving a ramp signal, a negative input terminal receiving a second terminal signal of the differential mode intermediate signal, and generates a second signal. The logic circuit performs a logic operation on the first and second signals to generate a third signal and a fourth signal. The driving unit generates a differential output signal to drive a load according to the third and fourth signals. | 06-03-2010 |
20100315163 | Class D Power Amplifier - A class D power amplifier includes: a signal input terminal for receiving an analog signal; an analog signal processing unit for amplifying the analog signal; an integrating circuit for integrating the analog signal received from analog signal processing unit; a PWM circuit for providing pulse width modulation to an integration signal received from the integrating circuit, and outputting a resulting pulse width modulation signal having a duty ratio falling within a first duty ratio range; a duty ratio adjusting circuit for adjusting the pulse width modulation signal, received from the PWM circuit, to have a pulse width falling within a second duty ratio range narrower than the first duty ratio range; a first driver and a second driver each for processing the pulse width modulation signal received from the duty ratio adjusting circuit; and power transistors. | 12-16-2010 |
20110043283 | VARIABLE FREQUENCY CLASS-D AMPLIFIER, CONTROL METHOD THEREOF, AND RAMP GENERATOR THEREFOR - A class-D amplifier includes a ramp generator to provide a ramp signal having a frequency varying with an audio input signal, and a modulator to convert the audio input signal to a pulse width modulation signal according to the ramp signal for a driver to drive a load device. The varying frequency of the ramp signal will cause the frequency of the pulse width modulation signal unfixed and consequently improves EMI issue. | 02-24-2011 |
20110221529 | CLASS D AMPLIFIER - A class D amplifier includes an amplifier that generates a digital signal for driving a load based on an input signal, an attenuator that attenuates the input signal according to an attenuation command signal, and a clip prevention controller that outputs the attenuation command signal to intermittently attenuate the input signal when the digital signal is brought into a clip state or a near-clip state. | 09-15-2011 |
20110248779 | AMPLIFIER CIRCUITRY, INTEGRATED CIRCUIT AND COMMUNICATION UNIT - Amplifier circuitry comprising a class-D amplifier for amplifying an audio input signal. The amplifier circuitry comprises sigma-delta modulation logic arranged to receive the audio input signal and to generate a modulated signal representative of the audio input signal, and an output stage arranged to generate an output signal for the amplifier circuitry. The amplifier circuitry further comprises finite impulse response, filter logic operably coupled between the modulation logic and the output stage, and having at least one zero in its transfer function arranged to substantially pass signal components within the modulated signal occurring at frequencies less than the at least one zero and to attenuate signal components within the modulated signal at frequencies greater than the at least one zero. | 10-13-2011 |
20110316625 | MIXED-SIGNAL TRANSMISSION CIRCUIT FOR SWITCHING POWER AMPLIFIERS - The invention relates to an upstream unit ( | 12-29-2011 |
20110316626 | D-CLASS AMPLIFIER - A D-class amplifier includes: a bridge circuit adapted to drive an inductive load; a power supply voltage detection section outputting a quantized power supply voltage signal indicating a power supply voltage fed to the bridge circuit; and a gain-controlled PWM section adjusting a gain in response to the quantized power supply voltage signal, amplifying the input signal in response to the gain, generating a PWM signal from the amplified input signal, and feeding the PWM signal to the bridge circuit. The power supply voltage detection section includes: an error integration section generating a quantized signal by integrating a difference between the power supply voltage and the quantized power supply voltage signal; and a digital filter removing high frequency components of the quantized signal to output the quantized power supply voltage signal. The gain-controlled PWM section controls the gain such that variations of the power supply voltage are cancelled. | 12-29-2011 |
20120013402 | Closed-loop class-d amplifier with modulated reference signal and related method - Disclosed is a closed-loop class-D amplifier circuit including a modulated reference signal generator that provides a modulated reference signal in a feed-forward path, where the reference signal is modulated corresponding to an input signal. The closed-loop class-D amplifier circuit further includes a comparator to generate a control signal based on a comparison of the modulated reference signal and a correction signal, which in turn is produced by filtering a combination of the input signal and a feedback signal. The closed-loop class-D amplifier circuit also includes a pulse generator to generate a pulse-width-modulated signal to drive an output stage of the closed-loop class-D amplifier based on the control signal. | 01-19-2012 |
20120105155 | PULSE WIDTH MODULATION CIRCUIT AND VOLTAGE-FEEDBACK CLASS-D AMPLIFIER CIRCUIT - The frequency characteristic of a voltage-feedback class-D amplifier circuit for driving an output load is improved. A triangular-wave correction circuit which compensates a gradient of a triangular wave is provided to a triangular-wave signal generator which supplies a triangular wave signal used as a PWM carrier to a comparison circuit for performing PWM modulation of an input signal. In an area where a duty of a command value for an output circuit drive becomes about 50%, a slew rate (gradient) of the triangular wave is decreased. | 05-03-2012 |
20120235742 | POWER AMPLIFIER - A power amplifier for amplifying an electric input signal in an operational frequency range and providing an output signal, comprising switching means ( | 09-20-2012 |
20130088294 | Attenuating Non-Linear Noise in An Amplifier with Alternating DC -offset Correction - An amplifier may include two or more pulse-width modulators controlling respective sets of switches to produce an amplified version of a source signal. A positive DC-offset based on the source signal may be applied to the pulse-width modulator controlling one respective set of switches, and an equal value negative DC-offset may be applied to the pulse-width modulator controlling the other respective set of switches, to provide an effective offset between the respective points in time of the rising/falling edges of the different pulse-width modulated control signals. The addition of alternating positive and negative DC-offset values doesn't affect the output load, and doesn't degrade the signal. The DC-offsets may be added at a frequency selected to be beyond the signal baseband, and the value of the small input signal level may be determined using an RMS level comparator or similar measurement technique. | 04-11-2013 |