| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 455110000 | Angle modulation | 34 |
| 20100075620 | NONLINEARITY CALIBRATION SCHEME FOR A FREQUENCY MODULATION TRANSMITTER - A nonlinearity calibration system and method for a frequency modulation (FM) transmitter. A nonlinearity calibration system for a FM transmitter includes a digitally controlled oscillator (DCO) with a variable capacitor array. The DCO receives a calibrated fine code for tuning the variable capacitor array to modulate a digitally encoded audio signal transmitted by the FM transmitter to a modulation frequency. The nonlinearity calibration system also includes a nonlinearity estimator for generating an approximation of an integral nonlinearity associated with processing of a fine code to tune the variable capacitor array. The nonlinearity calibration system further includes a subtractor for subtracting the approximation of the integral nonlinearity from the fine code to generate the calibrated fine code. | 03-25-2010 |
| 20100081398 | AUDIO SIGNAL PROCESSING CIRCUIT - An audio signal processing circuit comprising: a modulation circuit configured to output a modulated signal of a frequency corresponding to an input audio signal; a drive circuit configured to generate a driving current for driving the modulation circuit based on a control signal; an audio detection circuit configured to detect presence or absence of the audio signal input to the modulation circuit; and a control signal generation circuit configured to generate the control signal for generating the driving current in the drive circuit when the presence of the audio signal is detected and generate the control signal for stopping generation of the driving current in the drive circuit when the absence of the audio signal is detected for a predetermined period, based on a detection result of the audio detection circuit. | 04-01-2010 |
| 20130029616 | Transmitter with Hybrid Closed Loop Power Control - Systems and method for implementing a transmitter with hybrid closed loop power control in a communication device. | 01-31-2013 |
| 20090270054 | DIRECT CONVERSION DEVICE WITH COMPENSATION MEANS FOR A TRANSMISSION PATH OF A WIRELESS COMMUNICATION EQUIPMENT - A conversion device (CD) is dedicated to conversion of baseband analog I/Q input signals into RF signals in a transmitting path of a wireless communication equipment. This device (CD) comprises i) first (PP | 10-29-2009 |
| 20120108187 | TRANSMITTER CIRCUIT AND COMMUNICATION APPARATUS - A transmitter circuit is provided which is capable of reducing modulation distortion even when an output power of a power amplifying section | 05-03-2012 |
| 20090191826 | High-Efficiency Envelope Tracking Systems and Methods for Radio Frequency Power Amplifiers - Envelope tracking (ET) methods and systems for controlling the delivery of power to radio frequency power amplifiers (RFPAs). An exemplary ET system includes an RFPA and a wide bandwidth capable and power efficient envelope modulator that includes a first power supplying apparatus and a second power supplying apparatus. The first power supplying apparatus includes a switch-mode converter and a regulator. The first mode converter is operable to dynamically step down a fixed power supply voltage according to amplitude variations in an envelope signal received by the regulator, and use the resulting dynamic power supply signal to power the regulator. The second power supplying apparatus is connected in parallel with the first power supplying apparatus. Depending on a power of an output signal to be generated at an output of the power amplifier, power is supplied to the power amplifier from either or both of the first and second power supplying apparatuses. | 07-30-2009 |
| 20090081968 | Power Amplifier Controller With Polar Transmitter - A power amplifier controller controls a power amplifier and is coupled to a polar modulator. The polar modulator generates an amplitude component and a phase-modulated component of the desired RF modulated signal, and outputs to the power amplifier controller. The power amplifier controller regenerates a combined phase and amplitude modulated RF signal to generate an input signal to a power amplifier by adjusting the gain of a VGA based on the amplitude component of the desired RF modulated signal. Concurrently, the power amplifier controller both controls an adjusted supply voltage to the PA and adjusts the gain of the VGA based upon an amplitude correction signal or amplitude error signal. | 03-26-2009 |
| 20100261442 | INCIDENT AND REFLECTED SIGNAL PHASE DIFFERENCE DETECTION - Embodiments include methods and apparatus for detecting a phase angle between an incident signal and a reflected signal. The apparatus comprises a plurality of phase shifters and additional circuitry. The plurality of phase shifters is adapted to apply first phase shifts to a representation of the incident signal and to apply second phase shifts to a representation of the reflected signal. The additional circuitry, which is operatively coupled to the plurality of phase shifters, is adapted to produce a first indication of a location of a relative phase difference between the incident signal and the reflected signal within a first region of a first reference circle, and to produce a second indication of the location of the relative phase difference within a second region of a second reference circle, wherein the second reference circle is rotated with respect to the first reference circle. | 10-14-2010 |
| 20110059704 | TRANSMITTER AND SEMICONDUCTOR INTEGRATED CIRCUIT AVAILABLE FOR IT - The transmitter synthesizes amplitude and phase components and calibrates a delay mismatch between amplitude and phase components with high accuracy at high speed. The transmitter has: a digital-to-analog converter (DAC) and a low-pass filter (LPF) in its amplitude-signal path; and a phase modulator operable to convert up a phase component into an RF component in its phase-signal path. In an operation of delay calibration, a test input signal is supplied to a delay-calibrating unit in the amplitude-signal path, and the delay-calibrating unit provides a test input signal to DAC. Then, LPF generates a test output signal. The delay-calibrating unit detects a delay of the test output signal relative to the test input signal, calibrates an amplitude signal delay in a range from the input of the delay-calibrating unit to the output of LPF, reduces the difference between amplitude and phase signal delays of the phase modulator in the phase-signal path. | 03-10-2011 |
| 20100056081 | MODULATING APPARATUS, MOBILE COMMUNICATION SYSTEM, MODULATING METHOD, AND COMMUNICATION METHOD - An encoder encodes audio data and the like to generate a binary signal. A mapper converts the binary signal into a four-level symbol and outputs the four-level symbol. A base band filter includes a root raised cosine filter and a sinc filter. The base band filter blocks a predetermined frequency component of a symbol to shape the symbol into a waveform signal and outputs the waveform signal shape. An FM modulator transmits a signal subjected to FM modulation according to a magnitude of an amplitude of a waveform signal to a receiving unit. When a symbol of ±3 is outputted from the mapper, a frequency shift of a signal transmitted from the FM modulator has a predetermined value in a range of ±0.822 [kHz] to ±0.952 [kHz]. This makes it possible to provide a modulating apparatus, a mobile communication system, a modulating method, and a communication method that use a modulating method that can conform to the FCC rule to be enforced in 2005 without using a linear power amplifier. | 03-04-2010 |
| 20100311359 | Method and System for an N-Phase Transmitter Utilizing a Leaky Wave Antenna - Methods and systems for an n-phase transmitter utilizing a leaky wave antenna (LWA) are disclosed and may include transmitting an n-phase wireless signal at a first frequency via the LWA utilizing a plurality of second frequency signals from one or more signal sources, and the second frequency may be lower than the first frequency. Each of the second frequency signals may be configured with a phase difference and may be communicated to the LWA utilizing one or more power amplifiers (PAs). The PAs may be operated in switching mode, thereby generating a square wave. The LWAs may be integrated on the chip, on a package to which the chip is affixed, and/or on a printed circuit board to which the chip is affixed. Square wave signals may be generated utilizing the signal sources. The transmitted wireless signal may be amplitude modulated utilizing a bias voltage applied to the LWAs. | 12-09-2010 |
| 20110124301 | System and method for wireless communication of magnetic resonance data - In one embodiment, a method of wirelessly transmitting magnetic resonance (MR) data is provided. The method comprises steps of obtaining at least one MR signal having a Larmor frequency from a radio frequency (RF) channel in an RF coil, the RF coil comprising multiple RF channels, each RF channel associated with a single imaging element, generating a modulation signal based on the MR signal, generating a carrier signal with a predetermined frequency, the predetermined frequency being associated with the RF channel and using the modulation signal to phase modulate the carrier signal to form a phase-modulated signal. | 05-26-2011 |
| 20110250856 | Direct FM/PM Modulation - Representative implementations of direct FM/PM modulation and systems are disclosed describing frequency modulation or phase modulation of information onto a carrier signal using a divider that is remote from the carrier signal generation path. | 10-13-2011 |
| 20090098840 | Apparatus and method for measuring the level of RF signals, and a transmitter including a wide band measurement circuit - On a radio frequency signal path a transmission phase shifter causes a phase shift. From a first end of said phase shifter comes a first sample, and from a second end of said phase shifter comes a second sample. Another phase shifter changes the phase of the second sample by the same magnitude as said transmission phase shifter. A measurement circuit combines the phase-shifted second sample with a phase-inverted version of the first sample to produce an output indicative of a power level of the original signal on the radio frequency signal path. | 04-16-2009 |
| 20110151807 | PHASE MODULATION APPARATUS AND METHOD - A phase modulation apparatus and method are provided. The phase modulation apparatus includes a storage to store phase modulation setting values corresponding to various communication modes; a phase modulation setting value selector to select, when a communication mode is changed, phase modulation setting values corresponding to the changed communication mode among the phase modulation setting values stored in the storage; and a phase modulator to modulate a phase of a transmission signal using the phase modulation setting values selected by the phase modulation setting value selector. According to the phase modulation apparatus, since a frequency characteristic of a loop filter in a PLL circuit is changed depending on a transmission mode of a communication apparatus and phase modulation is performed using appropriate bandwidths according to various transmission modes, it is possible to prevent noise characteristics from degrading when a PLL bandwidth changes. | 06-23-2011 |
| 20100029225 | POLAR MODULATION TRANSMISSION APPARATUS - By compensating for a detection result of the detector in feedback control of output power of the power amplifier, the polar modulation transmission apparatus is able to realize accurate transmission power control. Polar modulation transmission apparatus | 02-04-2010 |
| 20090258612 | BANDWIDTH REDUCTION MECHANISM FOR POLAR MODULATION - A novel and useful apparatus for and method of reducing phase and amplitude modulation bandwidth in polar transmitters. The bandwidth reduction mechanism of the present invention effectively reduces the phase modulation bandwidth of the polar modulation performed in the transmitter by modifying the zero-crossing trajectories in the IQ domain. This significantly reduces the phase modulation bandwidth while still meeting the output spectrum and error vector magnitude (EVM) requirements of the particular modern wideband wireless standard, such as 3G WCDMA, etc. The mechanism detects a zero crossing or a near zero crossing within a predetermined threshold of the origin and an offset vector is generated that when added to the input TX IQ data, shifts the trajectory to avoid the origin thus reducing the resultant polar modulation amplitude and phase bandwidth. | 10-15-2009 |
| 20080261542 | POWER SUPPLY CIRCUIT - Provided is a power supply circuit capable of operating with low noise and low power consumption. In a power supply circuit | 10-23-2008 |
| 20110105056 | METHOD AND APPARATUS FOR TRANSMITTING SEQUENCE IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting a sequence in a wireless communication system is provided. A transmitter generates a block sequence comprising a first sub-block sequence and a second sub-block sequence, generates a phase modulated block sequence by performing phase modulation on the block sequence, maps the phase modulated block sequence to a plurality of sub-blocks, and transmits the phase modulated block sequence mapped to the plurality of sub-blocks. | 05-05-2011 |
| 20100291886 | Polar feedback architecture - Polar feedback architecture. A polar modulator, as may be implemented within a transmitter module, of a communication device includes feedback. This feedback involves monitoring of phase information and magnitude/amplitude information of an output signal generated by the polar modulator. The output signal can be a radio frequency (RF) signal such as may be transmitted via a communication channel within a communication system. A baseband processing module processes the monitored phase information and magnitude/amplitude information to perform adjustment of a phase modulator and/or other components within the polar modulator. | 11-18-2010 |
| 455111000 | Including distributed parameter structure | 1 |
| 20100099368 | MONOLITHIC FM-BAND TRANSMIT POWER AMPLIFIER FOR MOBILE CELLULAR DEVICES AND METHOD OF OPERATION THEREOF - An FM-band transmit power amplifier and a method of transmitting in multiple bands. In one embodiment, the FM-band transmit power amplifier has an input and an output and includes: (1) a pre-filter including a charge-pump based integrator coupled to the input and a passive notch filter having a notch frequency in a band other than an FM band and (2) an output driver coupled between the passive pre-filter and the output and having PMOS and NMOS transconductors configured to receive an output from the passive filter. | 04-22-2010 |
| 455113000 | With frequency control | 13 |
| 20100120381 | POLAR TRANSMITTER, METHOD AND APPARATUS FOR PHASE MODULATION - A phase modulation method with a polar transmitter. A target frequency is first designated by comparing the RF signal with a reference frequency and the phase sample. An oscillator control word is generated based on the target frequency. A digital oscillator can modulate from a first phase to a second phase to synthesize a preliminary RF signal based on the oscillator control word. When the target frequency exceeds the modulation capability of the digital oscillator, the oscillator control word is generated based on the target frequency minus 180 degrees, and the preliminary RF signal is shifted by 180 degrees to be the RF signal having the target frequency. When the target frequency does not exceed the modulation capability of the digital oscillator, the oscillator control word is generated solely based on the target frequency to output the preliminary RF signal to be the RF signal having the target frequency. | 05-13-2010 |
| 20100323638 | PHASE CORRECTOR AND PHASE CORRECTION METHOD - A phase corrector in a radio transmitter includes a quadrature modulator which modulates a first carrier signal by using an in-phase component and a quadrature component of a first signal, a quadrature demodulator which demodulates a feedback signal by using a second carrier signal to generate a second signal including an in-phase component and a quadrature component, a phase detector which detects a phase error between the first signal and the second signal based on the in-phase components and the quadrature components of the first signal and the second signal, and a phase shifter which performs phase shift of any one of the first signal, the second signal, the first carrier signal and the second carrier signal based on a sum value obtained by adding to the phase error a first phase amount varying on a time base in a given phase range. | 12-23-2010 |
| 20100285761 | FILTERING COMMUNICATIONS CHANNELS WITHIN TELECOMMUNICATIONS SATELLITES - A variable bandwidth filter for use in filtering signal channels in a telecommunication satellite between uplink and downlink beams, and having a reduced amount of phase noise, includes a first mixer for translating the frequency of an input signal by a first predetermined frequency value, a first filter for defining one edge of the variable bandwidth, a second mixer for translating the frequency of the input signal by a second predetermined frequency value, a second filter for defining another edge of the variable bandwidth, and further mixer for translating the frequency of the input signal by a further predetermined frequency value, and wherein first and second local oscillator frequencies are applied to the first mixer, the second mixer and the further mixer such that each frequency translation of the input signal in one direction has a counterpart translation of corresponding value in the opposite direction. | 11-11-2010 |
| 20080233900 | METHOD AND SYSTEM FOR CALIBRATION IN AN FM TRANSCEIVER SYSTEM WITH OFF-CHIP CONTROL - Aspects of a method and system for calibration in an FM transceiver system with off-chip control may include, in an integrated FM system comprising an FM radio transmitter, an FM radio receiver and a common local oscillator, receiving one or more control signals that control calibration of the integrated FM system. Responsive to the one or more control signals, one or more RF carrier signals and corresponding phase-shifted versions of the generated one or more RF carrier signals may be generated via the common local oscillator. The FM radio transmitter and/or the FM radio receiver may be calibrated based on an RF calibration signal generated from the one or more RF carrier signal and/or the corresponding phase-shifted versions of the generated one or more RF carrier signals. An in-phase baseband signal component associated with the generated RF calibration signal may be zeroed. | 09-25-2008 |
| 20080261543 | TRANSMISSION CIRCUIT AND COMMUNICATION DEVICE - Provided is a transmission circuit capable of operating with high linearity and with low noise. An AM variable fc filter | 10-23-2008 |
| 20100323640 | PHASE CORRECTION APPARATUS AND PHASE CORRECTION METHOD - A phase correction apparatus in a wireless transmitter includes a modulator configured to modulate an in-phase component and a quadrature component of a first signal by a first carrier wave signal, a demodulator configured to demodulate a returned signal by a second carrier wave signal and generate a second signal that includes an in-phase component and a quadrature component, a phase detector configured to binarize the in-phase components and the quadrature components of the first and second signals according to signal levels, and detect a phase error between the first signal and the second signal based on combinations of the binarized signal components in the first signal and the second signal, and a phase shifter configured to phase-shift the first signal, the second signal, the first carrier wave signal, or the second carrier wave signal, based on the phase error. | 12-23-2010 |
| 20100323639 | PHASE CORRECTION APPARATUS AND PHASE CORRECTION METHOD - A phase correction apparatus in a wireless transmitter includes a modulator for modulating a first carrier signal by an in-phase component and a quadrature-phase component of a first signal, a demodulator for demodulating a returned signal by a second carrier signal and generating a second signal including an in-phase component and an quadrature-phase component, a phase detector for detecting a phase error between the first signal and the second signal based on the in-phase components and the quadrature-phase components of the first and second signals, and a phase shifter group for performing a phase shift based on the phase error, the phase shifter group including a first phase shifter for performing a phase shift on any of the first signal, the second signal, the first carrier signal, and the second carrier signal and a second phase shifter for shifting a phase of the first signal. | 12-23-2010 |
| 20100330937 | FM SIGNAL TRANSMITTER AND AUDIO FILTERING METHOD - An FM signal transmitter has a processing module, a connecting module and an FM transmitting module. The connecting module is electronically connected to the processing module and has a Universal Serial Bus (USB) unit that is selectively connected to a computer and receives audio data from the computer, wherein the USB unit has a memory storing a preset USB class. The FM transmitting module is electronically connected to and controlled by the processing module to broadcast an FM signal corresponding to the audio data under a specific frequency. The computer may perform an audio filtering method to successively rewrite the preset USB class from USB-HID, USB-AUDIO and USB-HID so that the computer can transmit audio data excluding system generated sounds to the FM signal transmitter. | 12-30-2010 |
| 20080220731 | REVERSE PATH OPTICAL LINK USING FREQUENCY MODULATION - Systems and methods of upstream communications using frequency modulation are disclosed. An exemplary method embodiment, among others, includes frequency modulating a communications signal, intensity modulating the frequency modulated signal, and applying that intensity modulated signal to a transmission medium. Also disclosed is a method of receiving the upstream signal including intensity demodulating the signal received from the transmission medium and frequency demodulating the resultant signal. | 09-11-2008 |
| 20120129474 | Modulation Method and Apparatus - A modulation circuit for use in a radiofrequency transmitter includes a local oscillator circuit configured to generate one or more local oscillator signals at a desired frequency and with a duty cycle at or about twenty-five percent, and a modulator configured to generate one or more modulated signals responsive to the one or more local oscillator signals and one or more baseband information signals. In at least one embodiment, the modulation circuit includes a modulator comprising a combined mixing and transconductance circuit that includes a transistor circuit for each baseband information signal serving as a modulation input to the modulator. Each transistor circuit comprises a first transistor driven by the baseband information signal and coupling a modulator output node to a corresponding transconductance element, and a second transistor driven by one of the one or more local oscillator signals and coupling the corresponding transconductance element to a signal ground node. | 05-24-2012 |
| 20100273439 | RADIO COMMUNICATION APPARATUS AND DC OFFSET ADJUSTMENT METHOD - At a transmitting side, during carrier leak adjustment, quadrature modulation means uses a carrier wave having a frequency different from that at a receiving side to quadrature-modulate an outgoing signal. Feedback means feeds a modulated wave resulting from the quadrature modulation back to the receiving side. At the receiving side, quadrature demodulation means quadrature-demodulates the fed back modulated wave. Phase locking means locks the phase of the signal resulting from the quadrature demodulation to match the phase to the phase at the transmitting side. Offset detection means time-averages the phase-locked signal to detect a direct-current offset. At the transmitting side, based on the value of the direct-current offset detected at the receiving side, offset adjustment means corrects a direct-current offset of the outgoing signal to be quadrature-modulated. | 10-28-2010 |
| 20110124302 | Modulation Method and Apparatus - A modulation circuit for use in a radiofrequency transmitter includes a local oscillator circuit configured to generate one or more local oscillator signals at a desired frequency and with a duty cycle at or about twenty-five percent, and a modulator configured to generate one or more modulated signals responsive to the one or more local oscillator signals and one or more baseband information signals. In at least one embodiment, the modulation circuit includes a modulator comprising a combined mixing and transconductance circuit that includes a transistor circuit for each baseband information signal serving as a modulation input to the modulator. Each transistor circuit comprises a first transistor driven by the baseband information signal and coupling a modulator output node to a corresponding transconductance element, and a second transistor driven by one of the one or more local oscillator signals and coupling the corresponding transconductance element to a signal ground node. | 05-26-2011 |
| 20090029657 | AUTO FREQUENCY CONTROL METHOD - An auto frequency control method of this invention has a first step of a base station BS detecting a frequency deviation Δf | 01-29-2009 |
