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Frequency modifying or conversion

Subclass of:

455 - Telecommunications

455130000 - RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
455323000 Particular frequency conversion structure or circuitry 126
455318000 With specified local oscillator structure or coupling 25
455314000 Plural separate successive conversions 8
455317000 Unwanted oscillation or radiation prevention 6
Entries
DocumentTitleDate
20090221257Method and System For Down-Converting An Electromagnetic Signal, And Transforms For Same, And Aperture Relationships - Methods, systems, and apparatuses, and combinations and sub-combinations thereof, for down-converting an electromagnetic (EM) signal are described herein. Briefly stated, in embodiments the invention operates by receiving an EM signal and recursively operating on approximate half cycles (½, 1½, 2½, etc.) of the carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.09-03-2009
20090191834ENHANCED PROGRAMMABLE AUTOMATIC LEVEL CONTROL - An enhanced programmable automatic level control loop comprising an input for receiving an input RF signal; a level modulator, wherein the level modulator receives the input RF signal and a control signal and wherein the level modulator produces a first signal; a mixer that receives the first signal and mixes it with an LO signal to produce a second signal; a programmable attenuator that receives the second signal and produces an output signal; a level detector that monitors RF power of the output signal and produces a DC voltage proportional to the RF power; and wherein the DC voltage is received at a loop amplifier which produces the control signal.07-30-2009
20100112971FREQUENCY CONVERTING CIRCUIT AND RECEIVER - A receiver includes a multiphase mixer that multiplies a received radio signal by multiphase local signals the number of which is the same as an integer having a first prime factor and a second prime factor different from the first prime factor, and generates first multiphase baseband signals the number of which is the same as the integer, a first processing circuit that suppresses common modes for first multiphase signal groups formed by dividing the first multiphase baseband signals into groups of signals the number of which is the same as the first prime factor, and generates second multiphase baseband signals, and a second processing circuit that suppresses common modes for second multiphase signal groups formed by dividing the second multiphase baseband signals into groups of signals the number of which is the same as the second prime factor, and generates third multiphase baseband signals.05-06-2010
20130115906Down-Conversion of Multiple RF Channels - A method and system is disclosed for designing a radio for down-converting RF signals to IF signals by sampling the signals in a round-robin sampling circuit and multiplying the samples by coefficients that are changed at a fixed rate equal to the rate of operation of each of the sampling circuits. The circuit is able to down-convert multiple channels simultaneously to adjacent positions in the IF band, while rejecting unwanted image signals. The method and system avoids the difficulty and cost of directly digitizing the RF signal, allowing each component to operate at a greatly reduced speed. The coefficients are selected to provide the desired transfer function while keeping the output signal centered at a desired frequency.05-09-2013
20110130109DIFFERENTIAL AMPLIFIER CIRCUIT AND WIRELESS RECEIVING APPARATUS - A differential amplifier circuit includes a source follower circuit to which is input one of the differential signals and a common source circuit that is connected in series with the source follower circuit and to which is input the other of the differential signals.06-02-2011
20110275340SEMICONDUCTOR INTEGRATED CIRCUIT - The present invention aims to efficiently calibrate the characteristics of a pair of reception or transmission low-pass filters by a receiving or transmitting circuit. A semiconductor integrated circuit includes an RF receiver that processes an RF reception signal, an RF transmitter that generates an RF transmission signal and a frequency synthesizer. A reception low-pass filter of the RF receiver suppresses undesired components contained in I and Q baseband reception signals. A transmission low-pass filter of the RF transmitter suppresses noise due to D/A conversion, which is contained in I and Q transmission analog baseband signals. A calibration test signal is supplied to the inputs of the pair of reception or transmission low-pass filters. A difference in phase between the pair of filters is detected by a phase detection unit. A calibration controller calibrates a relative mismatch between the cut-off frequencies of the pair of filters.11-10-2011
20090088119METHOD AND SYSTEM FOR USING A MICROSTRIP TO SWITCH CIRCUITS IN CMOS APPLICATIONS - Aspects of a method and system for using a microstrip to switch circuits in CMOS applications may include generating a second signal from a first signal by frequency-translating the first signal by switching a first current associated with the first signal between a first signal path and a second signal path. The switched first current may be filtered via a microstrip filter that may be tuned to a desired frequency component of the frequency-translated first signal, and the second signal may be generated from the difference between the voltage of the first signal path and the second signal path.04-02-2009
20090156155RECEIVER, TUNER AND METHOD OF PROCESSING A TELEVISION SIGNAL - The invention is related to a receiver and a tuner respectively, particularly to a television receiver or tuner which can be integrated in a single circuit device. The invention is also related to a method for processing RF signal.06-18-2009
20090215421RF RECEIVER AND METHOD OF RECEIVING RF SIGNAL - A radio frequency (RF) receiver and a method of receiving an RF signal are provided. The RF receiver includes a low-noise amplifying unit which amplifies a received signal while restricting out-of-band interferer of the received signal, a sampling unit which performs sampling to convert the amplified signal to a discrete time domain signal, a frequency translation unit which down-converts the sampled signal into a frequency band that enables the sampled signal to be converted into a digital signal and restricts interferer from a frequency within an aliasing band according to a sampling frequency, an anti-aliasing filtering unit which prevents aliasing from the down-converted signal, a clock unit which provides the sampling unit, the frequency translation unit, and the anti-aliasing filtering unit with sampling frequencies, and an analog-digital-converter which converts the converted signal into the digital signal.08-27-2009
20100099372TUNABLE FILTERS WITH LOWER RESIDUAL SIDEBAND - An apparatus includes first and second filters and a bandwidth control circuit. The first filter operates as part of a first oscillator in a first mode and filters a first input signal and provides a first output signal in a second mode. The second filter operates as part of a second oscillator in the first mode and filters a second input signal and provides a second output signal in the second mode. The bandwidth control circuit adjusts the bandwidth of the first and second filters in the first mode, e.g., adjusts the oscillation frequency of each oscillator to obtain a target bandwidth for an associated filter. The apparatus may further include first and second gain control circuits. Each gain control circuit may vary the amplitude of an oscillator signal from an associated oscillator and/or set a gain of an associated filter in the first mode.04-22-2010
20080311876Signal Receiver for Wideband Wireless Communication - A signal receiver for use in a 60 GHz wireless area network, in which the received RF signal band (12-18-2008
20080268806Digital Radio Frequency Memory - A digital radio frequency memory (DFRM) which converts an incoming analog radio frequency signal to a fourteen bit digital signal allowing for digital signal processing and then retransmitted as an analog RF signal. The DFRM provides a time delay for RF signals by storing the signal. The DFRM also changes the signal frequency in the range of plus or minus 100,000 KHz which places a doppler on the signal. The signal phase is changed in a range of 0 to 359 degrees by the DFRM.10-30-2008
20090081982METHOD AND SYSTEM FOR DISTRIBUTED TRANSCEIVERS BASED ON NOTCH FILTERS AND PASSIVE MIXERS - Aspects of a method and system for a distributed transceiver for high frequency applications may include generating a second signal from a first signal by frequency-translating the first signal via a plurality of conversion stages. Each of the plurality of conversion stages may frequency-translate a corresponding input signal by a local oscillator frequency or by a fraction of said local oscillator frequency, and each of the plurality of conversion stages may comprise a multiplier and a notch filter. The first signal may be the corresponding input signal to an initial stage of a the plurality of conversion stages, an output signal of a previous one of the plurality of conversion stages may be the corresponding input signal to a subsequent one of the plurality of conversion stages, and the second signal may be an output signal of a final stage of the plurality of conversion stages.03-26-2009
20090258629BROADBAND TUNER FOR VERY WIDE SIGNAL CONVERSION - An agile RF tuner circuit capable of converting a wide portion of RF signal into an IF signal suitable for analog-to-digital conversion. The circuit up converts a received RF signal to a high IF signal and then down converts the high IF signal to a low IF signal. Embodiments of the RF circuit incorporate harmonic reject mixers to suppress harmonies and intermodulations typically associated with the frequency conversion process.10-15-2009
20090186591RECEIVER - In a mixer circuit 07-23-2009
20090170464Enhanced Mixer Device - This device (07-02-2009
20120142302DOWN SAMPLING METHOD AND DOWN SAMPLING DEVICE - In the field of communications technologies, a down sampling method and a down sampling device are provided, to enable the energy of a down sampling point obtained in down sampling to be as large as possible. The down sampling method includes: extracting energy statistical values of sampling point sets in a current period; selecting a sampling position corresponding to a sampling point set with the largest energy statistical value as a down sampling position; and performing down sampling according to the down sampling position.06-07-2012
20090203346DOWN-CONVERTER AND CALIBRATION METHOD THEREOF - A mixer and calibration method thereof are provided. A direct conversion receiver comprises a differential loading pair utilizing at least one binary weighted resistor. The binary weighted resistor is adjustable to provide a resistance linear to a digital code, comprising a fixed resistor and an adjustable resistor cascaded to the fixed resistor in parallel. Every increment of the digital code induces an equal increment of the resistance. The magnitude of every incremental resistance is below a negligible ratio of the fixed resistor.08-13-2009
20090203345Method and system for down-converting an Electromagnetic signal, transforms for same, and Aperture relationships - Methods, systems, and apparatuses, and combinations and sub-combinations thereof, for down-converting an electromagnetic (EM) signal are described herein. Briefly stated, in embodiments the invention operates by receiving an EM signal and recursively operating on approximate half cycles (½, 1½, 2½, etc.) of the carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.08-13-2009
20090117870RECEIVER - There are provided an IF signal generating portion 05-07-2009
20090215422RECEIVER - By providing switch portions (08-27-2009
20100167682Radio receiver - An apparatus configured to separate from a received radio frequency (RF) signal a first low-frequency signal and a second low-frequency signal having different phases, up-convert the first low-frequency signal and the second low-frequency signal into a first intermediate frequency signal and a second intermediate frequency signal, respectively, and amplify the first and the second intermediate-frequency signals.07-01-2010
20090081981METHOD AND SYSTEM FOR A DISTRIBUTED TRANSCEIVER FOR HIGH FREQUENCY APPLICATIONS - Aspects of a method and system for a distributed transceiver for high frequency applications may include generating a second signal from a first signal by frequency-translating the first signal via a plurality of conversion stages. Each of the plurality of conversion stages may frequency-translate a corresponding input signal by a local oscillator frequency or by a fraction of said local oscillator frequency. The first signal may be the corresponding input signal to an initial stage of a the plurality of conversion stages, an output signal of a previous one of the plurality of conversion stages may be the corresponding input signal to a subsequent one of the plurality of conversion stages, and the second signal may be an output signal of a final stage of the plurality of conversion stages.03-26-2009
20110151821Methods and Systems for Down-Converting a Signal Using a Complementary Transistor Structure - Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is aliased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down-converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a demodulated baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.06-23-2011
20100311382RECEPTION DEVICE AND ELECTRONIC DEVICE USING THE SAME - Provided is a reception device that selectively receives an analog broadcast signal and a digital broadcast signal. The reception device includes: an oscillation unit operable to output an oscillator signal; a frequency conversion unit operable to output an IF (Intermediate Frequency) signal group based on the oscillator signal outputted from the oscillation unit and a reception signal; a filter unit connected to an output side of the frequency conversion unit; and a control unit operable to control a frequency of the oscillator signal outputted from the oscillation unit. The control unit controls: the frequency of the oscillator signal to be within a reception frequency band when receiving the digital broadcast signal; and the frequency of the oscillator signal to be outside the reception frequency band when receiving the analog broadcast signal. With this configuration, it is possible to improve reception quality when receiving an analog broadcast signal.12-09-2010
20100190463FREQUENCY DIVIDER WITH AN AC-COUPLING ELEMENT ON ITS FEEDBACK PATH - One embodiment relates to a frequency divider. The frequency divider includes an active mixer having a first mixer input, a second mixer input, and a mixer output. The first mixer input is adapted to receive an input signal having an input frequency, and the mixer output is adapted to provide a mixed signal based on the input signal. The frequency divider also includes an amplification element having an amplification input and an amplification output. The amplification input is adapted to receive the mixed signal and the amplification output is adapted to provide an amplification output signal having an output frequency. A feedback path, which includes an alternating current (AC) coupling element, couples the amplification output to the second mixer input. Other systems and methods are also disclosed.07-29-2010
20090023412FM RADIO RECEIVER - A diversity FM radio receiver comprises two tuners for simultaneously tuning to the same FM channel. To avoid disturbances between the local oscillator signals of the tuners and to be able to use standard IF filters, one of the tuners operate with high-side LO injection and the other tuner operates with low-side LO-injection. To equalize the frequencies of the signals to be subjected to the diversity operation the two IF-signals of the tuners are fed to complex mixers with oppositely rotating phases.01-22-2009
20120252393Technique to Generate Divide by Two and 25% Duty Cycle - A frequency divider with a twenty-five percent duty cycle is disclosed. A frequency divider may include an input configured to receive a clock signal, each cycle of the clock signal including a first phase and a second phase, a plurality of latches, and a plurality of three-state circuits wherein a first of the plurality of three-state circuits is configured to drive a first twenty-five percent duty cycle signal from within the first three-state circuit high during a first phase of a first of two clock cycles.10-04-2012
20090253398MODULATION AND UPCONVERSION TECHNIQUES - Techniques are disclosed for producing RF signals from baseband signals. For instance, an apparatus may include an intermediate frequency (IF) signal generation module, and an upconversion module. The IF signal generation module produces an analog IF signal from a digital baseband signal. In turn, the upconversion module generates a radio frequency (RF) output signal from the analog IF signal. The upconversion module may include a translational phase locked loop (PLL) to receive the analog IF signal and to produce the RF output signal. The RF output signal may be for transmission in a wireless communications network, such as a cellular network.10-08-2009
20120046008Translational Switching System and Signal Distribution System Employing Same - A frequency translation system includes first and second translational switches, and a signal bus coupled therebetween. The first translational switch includes one or more inputs configured to receive a respective one or more first input signals, a first plurality of outputs, and a second plurality of outputs. The second translational switch includes one or more inputs configured to receive a respective one or more second input signals, a first output, and a second output. The signal bus, coupled between the first and second translational switches, includes (i) a first bus line coupled to a first one of the first plurality of outputs of the first translational switch, and to the first output of the second translational switch, and (ii) a second bus line coupled to a first one of the second plurality of outputs of the first translational switch, and to the second output of the second translational switch.02-23-2012
20120015619MIXER ARRANGEMENT - A quadrature connected passive mixer arrangement for frequency converting analog signals from a first to a second frequency. The arrangement comprises two parallel connected mixers provided as transistors. First and second LO signals and their inverse signals having separated phases are provided for driving the transistors. Signal path switches are provided between the RF terminals and the mixer transistors. The switches are driven by signals having a different phase than the signal driving the corresponding mixer transistor. Thus, any short circuit between IF terminals of the arrangement may be eliminated.01-19-2012
20110183640Method and System for Down-Converting an Electromagnetic Signal, and Transforms for Same, and Aperture Relationships - Methods, systems, and apparatuses, and combinations and sub-combinations thereof, for down-converting an electromagnetic (EM) signal are described herein. Briefly stated, in embodiments the invention operates by receiving an EM signal and recursively operating on approximate half cycles (½, 1½, 2½, etc.) of the carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.07-28-2011
20120178397RECEIVER APPLIED TO A SATELLITE DOWN CONVERTER AND RADIO FREQUENCY METAL-OXIDE-SEMICONDUCTOR AMPLIFIER - A receiver includes a radio frequency metal-oxide-semiconductor amplifier, a mixer, and an intermediate frequency amplifier. The radio frequency metal-oxide-semiconductor amplifier is used for receiving amplifying a signal of a first band and a signal of a second band of a satellite microwave band from an external antenna circuit according to a control signal. The mixer is coupled to the radio frequency metal-oxide-semiconductor amplifier for reducing the signal of the first band to a signal of a first intermediate frequency band according to a first oscillation frequency of a local oscillator, or reducing the signal of the second band to a signal of a second intermediate frequency band according to a second oscillation frequency of the local oscillator. The intermediate frequency amplifier is coupled to the mixer for amplifying and outputting the signal of the first intermediate frequency band and the signal of the second intermediate frequency band.07-12-2012
20100009648Receiver for multiple signal spectra - A radio receiver for receiving first signals of a first frequency spectrum having principal energy in a first frequency band and second signals of a second frequency spectrum having principal energy in second and third frequency bands, located on either side of the first frequency band, includes (i) an input for receiving an incoming signal; (ii) frequency shifting means for frequency shifting the incoming signal to form an intermediate frequency signal; and (iii) a filter for filtering the intermediate frequency signal. The filter has a frequency response that has a first passband and a second passband separated by a central stopband. A control unit for controlling the frequency shifting means has first and second modes for reception of the first and second signals. In the first mode, the control unit controls the frequency shifting means so as to frequency shift the incoming signal so that (a) the first frequency band of the incoming signal is shifted onto one of the first and second passbands and (b) one of the second and third frequency bands of the incoming signal is shifted onto the central stopband. In the second mode, the control unit controls the frequency shifting means so as to frequency shift the incoming signal so that (a) the second and third frequency bands of the incoming signal are shifted onto, respectively, the first and second passbands and (b) the first frequency band of the incoming signal is shifted onto the central stopband.01-14-2010
20090061809METHODS AND APPARATUS TO IMPLEMENT RECEIVER LINEARITY ENHANCEMENT - Methods and apparatus to implement receiver linearity enhancement are described. One example method includes controlling receiver gain by determining a level of a received signal that is to be provided to a radio frequency component; determining if the level of the received signal would cause the radio frequency components internally generated noise to increase; and when the level of the received signal would cause the radio frequency components internally generated noise to increase, reducing the level of the received signal prior to providing the received signal to the radio frequency component.03-05-2009
20100093301HETERODYNE RECEIVER USING ANALOG DISCRETE-TIME SIGNAL PROCESSING AND SIGNAL RECEIVING METHOD THEREOF - A heterodyne receiver of a wireless communication system using an analog discrete-time signal processing is provided. The heterodyne receiver includes: a radio signal processing unit configured to extract a signal of a desired band from a received radio signal and convert the extracted signal into an intermediate frequency (IF) signal that is an integer multiple of a sample rate specified in a specification of the wireless communication system; a discrete-time signal processing unit configured to charge-sample the IF signal in unit of a predetermined time and perform an anti-aliasing filtering and a successive decimation on the charge-sampled signal, a final output rate according to the decimation being an integer multiple of the specified sample rate; and an analog-to-digital conversion unit configured to convert the successively-decimated analog signal into a digital signal.04-15-2010
20120264390MOBILE COMMUNICATIONS RADIO RECEIVER FOR MULTIPLE NETWORK OPERATION - A mobile communications radio receiver for multiple radio network operation includes an RF unit configured to generate a first down-converted signal from a radio signal received from a first radio network and a second down-converted signal from a radio signal received from a second radio network. Further, the mobile communications radio receiver includes a paging indicator channel demodulator configured to demodulate during a first period of time a paging indicator channel of the first radio network based on the first down-converted signal and for demodulating during a second period of time a paging indicator channel of the second radio network based on the second down-converted signal.10-18-2012
20120252394RAPID AUTONOMOUS SCAN IN FM OR OTHER RECEIVERS WITH PARALLEL SEARCH STRATEGY, AND CIRCUITS, PROCESSES AND SYSTEMS - A wireless receiver scan circuit (10-04-2012
20130143511Method and Apparatus of an Input Resistance of a Passive Mixer to Broaden the Input Matching Bandwidth of a Common Source/Gate LNA - A cascode common source and common gate LNAs operating at 60 GHz are introduced and described. The cascode common source LNA is simulated to arrive at an optimum ratio of upper device width to the lower device width. The voltage output of the cascode common source LNA is translated into a current to feed and apply energy to the mixer stage. These input current signals apply the energy associated with the current directly into the switched capacitors in the mixer to minimize the overall power dissipation of the system. The LNA is capacitively coupled to the mixer switches in the I and Q mixers and are enabled and disabled by the clocks generated by the quadrature oscillator. These signals are then amplified by a differential amplifier to generate the sum and difference frequency spectra.06-06-2013
20100279643COMMUNICATION DEVICE, COMMUNICATION SYSTEM, CONTROL METHOD, AND CONTROL PROGRAM - To provide a communication device in which an operation of demodulating a reception signal can be performed with good accuracy.11-04-2010
20100304702RADIO RECEIVER - Operating a radio receiver can include identifying a set of stations that broadcast a radio program using different frequencies or different transmission protocols at substantially the same time. Broadcast signal strength, or some other signal quality metric, of broadcast signals from the stations can be evaluated, and the radio receiver can be tuned to one of the stations in the set of stations based on the evaluation.12-02-2010
20100317312APPARATUS AND METHOD FOR COMPENSATING FOR DC-OFFSET IN DIRECT CONVERSION RECEIVER OF WIRELESS COMMUNICATIONS SYSTEM - An apparatus and method of compensating for a direct voltage offset in a direct conversion receiver of a wireless communications system is provided. The apparatus includes a voltage control oscillator for generating a local oscillation signal having the same frequency as an input signal, a frequency converter for combining the input signal with the local oscillation signal, a first compensator for determining a first direct voltage offset generated due to a leaked local oscillation signal flowed into the frequency converter, for feeding back a magnitude of the determined first direct voltage offset to the frequency converter and for compensating for the first direct voltage offset, and a first register for storing a magnitude of direct voltage offset for a first variable gain amplifier, wherein the first variable gain amplifier is positioned in a rear end of the frequency converter, connected to the first register, and performs a modem associated offset compensation using a magnitude of direct voltage offset stored in the first register.12-16-2010

Patent applications in class Frequency modifying or conversion

Patent applications in all subclasses Frequency modifying or conversion