Patent application number | Description | Published |
20100033246 | ADAPTIVE DIGITAL PREDISTORTION OF COMPLEX MODULATED WAVEFORM USING PEAK AND RMS VOLTAGE FEEDBACK FROM THE OUTPUT OF A POWER AMPLIFIER - Exemplary embodiments of the invention includes an amplifier and a processor that adapts a baseline or previous model of the input-output signal characteristic of the amplifier using metrics of the system, including peak power, peak voltage, average power, root mean square (RMS) voltage, samples of the output signal of the amplifier, or environmental metrics such as temperature, power supply voltage, signal frequency, etc. In particular, the system comprises an amplifier; a device to measure a metric of the system; a processor to generate a present model of the input-output signal characteristic of the amplifier based on the system metric; and a predistortion device to predistort the input signal for the amplifier based on the present amplifier model. | 02-11-2010 |
20100271123 | ADAPTIVE DIGITAL PREDISTORTION OF COMPLEX MODULATED WAVEFORM USING LOCALIZED PEAK FEEDBACK FROM THE OUTPUT OF A POWER AMPLIFIER - Exemplary embodiments of the invention includes an amplifier and a processor that adapts a baseline or previous model of the input-output signal characteristic of the amplifier using metrics of the system, including peak power, peak voltage, average power, root mean square (RMS) voltage, samples of the output signal of the amplifier, etc. In particular, the system comprises an amplifier; a device to measure a metric of the system; a processor to generate a present model of the input-output signal characteristic of the amplifier based on the system metric as determined through a localized sampling window of the output signal; and a predistortion device to predistort the input signal for the amplifier based on the present amplifier model. | 10-28-2010 |
20110103455 | ADAPTIVE DIGITAL POST DISTORTION REDUCTION - A method for adaptive digital post distortion reduction is described. An analog radio frequency (RF) signal is received. The frequency of the analog RF signal is downconverted using analog circuitry. The analog RF signal is converted to a digital signal using an analog to digital converter (ADC). Digital post distortion reduction is applied to the digital signal to reduce nonlinearities in the digital signal. | 05-05-2011 |
20120002752 | PREDISTORTION OF COMPLEX MODULATED WAVEFORM - Exemplary embodiments of the invention include a transmitter system configured to predistort an input signal to generate a target output signal. An exemplary transmitter system includes a forward path including a predistortion device coupled with an amplifier, the forward path configured for predistorting an input signal to the predistortion device in response to a phase error compensation signal and an amplitude error compensation signal in order to generate a desired output signal for the output signal of the amplifier, and a feedback path including a processor configured for generating the phase error compensation signal and the amplitude error compensation signal based on a comparison of the input signal with phase and amplitude information of the output signal of the amplifier, wherein the phase and amplitude information of the amplifier are transmitted to the processor on a single path of the feedback path. Other methods and apparatuses are also presented herein. | 01-05-2012 |
20130094550 | SHARED FEEDBACK FOR ADAPTIVE TRANSMITTER PRE-DISTORTION - A modem is described. The modem includes a transmitter. The transmitter includes a digital pre-distortion module and a power amplifier. The modem also includes one or more selected shared receivers. The one or more selected shared receivers generate a feedback signal for the digital pre-distortion module. The modem further includes a feedback switch. The feedback switch selectively couples the one or more selected shared receivers to an output of the transmitter. | 04-18-2013 |
20150145600 | CIRCUITS AND METHODS FOR POWER AMPLIFICATION WITH EXTENDED HIGH EFFICIENCY - The present disclosure includes circuits and methods for power amplifiers. In one embodiment, a main and peaking amplifier receive dynamic power supply voltages to operate an RF power amplifier in a high efficiency range for a particular output voltage. The power supply voltages may be changed based on an output voltage so that the power amplifier operates within a high efficiency plateau. In one embodiment, different discrete power supply voltage levels are used for different output voltage ranges. In another embodiment, a continuous time varying power supply voltage is provided as the power supply voltage. A dynamic supply voltage may be generated having a lower frequency than a signal path of the power amplifier. | 05-28-2015 |
Patent application number | Description | Published |
20100069023 | METHOD AND APPARATUS FOR PREDISTORTING A WAVEFORM FOR INPUT TO AN AMPLIFIER - A method of predistorting a waveform for input to an amplifier includes receiving information associated with the waveform, the information comprising a modulation configuration of the waveform. The method further includes predicting a chain model for the waveform based on the modulation configuration. In addition, the method includes predistorting the waveform for input to the amplifier, based on the chain model, an ideal waveform, and target output power. An apparatus is also provided for predistorting a waveform for input to an amplifier. | 03-18-2010 |
20140092838 | DETERMINING MAXIMUM POWER REDUCTION (MPR) FOR MULTI-CLUSTER WIRELESS TRANSMISSIONS - A method of wireless communication includes determining spectral positions of intermodulation distortion products for a multi-cluster transmission. The method also includes mapping the spectral positions to corresponding spectral regions. The method further includes determining a maximum power reduction value of the multi-cluster transmission based on the corresponding spectral regions. | 04-03-2014 |
20150229272 | TRI-PHASE DIGITAL POLAR MODULATOR - Exemplary embodiments are related to a tri-phase digital polar modulator. A device may include a modulator configured to generate a primary phase modulated signal including the most significant bits (MSBs) of a modulated signal, a leading phase modulated signal including a first least significant bits (LSB) of the modulated signal, and a lagging phase modulated signal including a second LSB of the modulated signal. The device may also include a combination unit configured to add the primary phase modulated signal, the leading phase modulated signal, and the lagging phase modulated signal | 08-13-2015 |
20150244322 | BIAS CIRCUITS AND METHODS FOR STACKED DEVICES - Embodiments of the present disclosure include a bias circuit for generating bias voltages to stacked transistors. In one embodiment, stacked transistors are coupled between an input transistor and an output node. A modulated power supply voltage and an input signal produce a voltage at the output node. The modulated power supply voltage is provided as an input to the bias circuit. Bias voltages are generated that change with the power supply voltage. In one embodiment, particular transistors in the stack are biased so that their control terminals are effectively short circuited when the power supply voltage is reduced. | 08-27-2015 |
20150295541 | CIRCUITS AND METHODS FOR BIASING A POWER AMPLIFIER - The present disclosure includes circuits and methods for power amplifiers. In one embodiment, a main amplifier stage and peaking amplifier stage of a power amplifier receive a modulated supply voltage. The peaking amplifier stage is biased dynamically to adjust the bias of peaking stage to compensate for changes in the power supply voltage. A bias voltage may be increased as the supply voltage on the peaking stage decreases, and the bias voltage may be decreased as the supply voltage on the peaking stage increases. Accordingly, bias characteristics of the peaking stage are maintained across supply voltage variations, and the efficiency of the power amplifier is improved. | 10-15-2015 |