Patent application number | Description | Published |
20080243899 | SYSTEMS, APPARATUS AND METHOD FOR PERFORMING DIGITAL PRE-DISTORTION BASED ON LOOKUP TABLE GAIN VALUES | 10-02-2008 |
20080298500 | SYSTEMS, APPARATUS, AND METHODS FOR PERFORMING DIGITAL PRE-DISTORTION WITH FEEDBACK SIGNAL ADJUSTMENT - In an embodiment, a digital pre-distortion apparatus processes an input signal to produce a pre-distorted signal, and processes the pre-distorted signal to produce a feedback signal. The apparatus also rotates an adjustment gain by a gain rotation angle to produce a rotated adjustment gain, where the gain rotation angle is based on a phase difference between the input signal and the feedback signal. The apparatus also applies the rotated adjustment gain to the feedback signal, which may result in rotation of the feedback signal into a target phase region. | 12-04-2008 |
20090111399 | ADAPTIVE PRE-DISTORTION WITH INTERFERENCE DETECTION AND MITIGATION - Embodiments include methods, apparatus, and electronic systems adapted to perform adaptive pre-distortion. Embodiments include combining an input sample with a gain value to generate a pre-distorted data sample, where the gain value is a function of at least one gain entry stored within a gain lookup table. An amplified analog signal is generated from the pre-distorted data sample, and a feedback sample is also generated, which corresponds to an antenna output signal. The antenna output signal includes the amplified analog signal. A difference indicator is generated to reflect a difference between the input sample and the feedback sample, and at least one updated gain value is generated based on a comparison between the difference indicator and at least one previous difference indicator. At least one gain entry within the gain lookup table is updated with the at least one updated gain value. | 04-30-2009 |
20090179704 | LOAD INSENSITIVE BALANCED POWER AMPLIFIER AND RELATED OPERATING METHOD - A balanced power amplifier that is insensitive to load line variations is provided. The balanced power amplifier is suitable for use in wireless transmitter applications, such as cellular telephones, mobile computing devices, and portable communication devices. An embodiment of such a balanced power amplifier includes an input coupler, first and second amplifier devices, and a level adjustment component. The input coupler generates a first signal component and a second signal component from an input signal, where the first signal component and the second signal component are out of phase relative to one another. The first amplifier device generates a first output signal that is influenced by the first signal component, and the second amplifier device generates a second output signal that is influenced by the second signal component. The level adjustment component is coupled between the input coupler device and the input of the first amplifier device. The level adjustment component performs signal level tuning on its input signal. The signal level tuning is adaptively performed in response to the impedance characteristics of the load being driven by the balanced power amplifier. | 07-16-2009 |
20110183636 | RADIO FREQUENCY TRANSMITTER HAVING AN AMPLIFIER WITH POWER SUPPLY MODULATION - A circuit including a carrier amplifier having an input, an output, a first transistor coupled to a first power supply voltage terminal for receiving a modulated power supply voltage, and a second transistor coupled to a second power supply voltage terminal for receiving a fixed power supply voltage is provided. The circuit further includes a peaking amplifier having an input coupled to the input of the carrier amplifier and an output coupled to the output of the carrier amplifier. | 07-28-2011 |
20120213263 | 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. | 08-23-2012 |
20130194017 | DELAY LINE PHASE SHIFTER WITH SELECTABLE PHASE SHIFT - A phase shifter with selectable phase shift and comprises a switchable phase shifting element that includes a first and second signal path coupled between an input and an output and providing a, respective, first and second phase shift for a signal coupled through the respective signal paths; a switch circuit for selecting between the first and second signal paths where the first and second signal paths and the switch circuit are configured to equalize the insertion loss for the first and second signal path, the phase shifter further including control circuit for controlling the switch circuit. | 08-01-2013 |
20130194023 | ADJUSTABLE POWER SPLITTER AND CORRESPONDING METHODS & APPARATUS - An adjustable power splitter includes: a power divider with an input and a first and second divider output; a first adjustable phase shifter and first adjustable attenuator series coupled to the first divider output and providing a first power output; and a second adjustable phase shifter and second adjustable attenuator series coupled to the second divider output and providing a second power output. | 08-01-2013 |
20130314143 | ADJUSTABLE POWER SPLITTER AND CORRESPONDING METHODS & APPARATUS - An adjustable power splitter includes: a power divider with an input and a first and second divider output; a first adjustable phase shifter and first adjustable attenuator series coupled to the first divider output and providing a first power output; a second adjustable phase shifter and second adjustable attenuator series coupled to the second divider output and providing a second power output; an interface; and a controller. The controller is configured to receive, via the interface, data indicating phase shifts to be applied by the first and second adjustable phase shifters and attenuation levels to be applied by the first and second adjustable attenuators, and to control, based on the data, the phase shifts and attenuation levels applied by the first and second adjustable phase shifters and the first and second adjustable attenuators. | 11-28-2013 |
20140070881 | QUIESCENT CURRENT DETERMINATION USING IN-PACKAGE VOLTAGE MEASUREMENTS - Apparatus, systems, and fabrication methods are provided for biasing amplifier arrangements inside device packages to a target quiescent current. In one embodiment, an amplifier device has an output interface and includes an amplifier arrangement having an amplifier output and impedance matching circuitry coupled between the amplifier output and the output interface. A method for biasing the amplifier arrangement involves measuring or otherwise obtaining a voltage between the amplifier output and the output interface, determining an estimated quiescent current through the amplifier arrangement based on that voltage, and adjusting a bias voltage provided to the input of the amplifier arrangement based on a difference between the estimated quiescent current. In exemplary embodiments, the bias voltage is adjusted until the estimated quiescent current is substantially equal to a target quiescent current. | 03-13-2014 |
20140077874 | ADJUSTABLE POWER SPLITTERS AND CORRESPONDING METHODS & APPARATUS - An adjustable power splitter includes: a power divider with an input and a plurality, N, of divider outputs; a plurality, N, of adjustable phase shifters and a plurality, N, of adjustable attenuators series coupled to the divider outputs and providing a plurality, N, of power outputs; an interface; and a controller. The controller is configured to receive, via the interface, data indicating phase shifts to be applied by the adjustable phase shifters and attenuation levels to be applied by the adjustable attenuators, and to control, based on the data, the phase shifts and attenuation levels applied by the adjustable phase shifters and the adjustable attenuators. | 03-20-2014 |
20140253248 | PHASE SHIFT AND ATTENUATION CIRCUITS FOR USE WITH MULTIPLE-PATH AMPLIFIERS - Embodiments of circuits for use with an amplifier that includes multiple amplifier paths include a first series circuit and a second series circuit in parallel with the first series circuit. The first series circuit includes a first input coupled to a first power divider output, a first output coupled to a first amplifier path of the multiple amplifier paths, and a first adjustable phase shifter and a first adjustable attenuator series coupled between the first input and the first output. The second series circuit includes a second input coupled to a second power divider output, a second output coupled to a second amplifier path of the multiple amplifier paths, and a second adjustable phase shifter and a second adjustable attenuator series coupled between the second input and the second output. | 09-11-2014 |
20140312975 | AMPLIFIER USING NONLINEAR DRIVERS - A device includes a Doherty amplifier having a main path and a peaking path. The Doherty amplifier includes a main amplifier configured to amplify a signal received from the main path and a peaking amplifier configured to amplify a signal received from the peaking path when the signal received from the peaking path exceeds a predetermined threshold. The device includes a first driver amplifier connected to the main path of the Doherty amplifier. The first driver amplifier is configured to exhibit an amplitude and phase distortion characteristic that is an inverse of an amplitude and phase distortion characteristic of the main amplifier. The device includes a second driver amplifier connected to the peaking path of the Doherty amplifier. The second driver amplifier is configured to exhibit an amplitude and phase distortion characteristic that is an inverse of an amplitude and phase distortion characteristic of the peaking amplifier. | 10-23-2014 |
20150028948 | SWITCH-MODE AMPLIFIER - A device includes a Doherty amplifier. The Doherty amplifier has a carrier path and a peaking path. The Doherty amplifier includes a carrier amplifier configured to amplify a signal received from the carrier path and a peaking amplifier configured to amplify a signal received from the peaking path. The device includes a resistive switch having a first terminal connected to the peaking path and a second terminal connected to a voltage reference, and a controller configured to set the resistive switch to a first resistance value when a power input of the Doherty amplifier is below a threshold and to a second resistance value when the power input of the Doherty amplifier is above the threshold. | 01-29-2015 |
20150035604 | COUPLER WITH DISTRIBUTED FEEDING AND COMPENSATION - The embodiments described herein can provide improved signal feeding between hybrid couplers and associated transistors. As such, these embodiments can improve the performance of amplifiers and other such RF devices that utilize these components. In one embodiment a device includes a distribution network and a compensation resonator. The distribution network is configured to output a signal through a relatively wide output feedline. This relatively wide output feedline provides distributed signal feeding that can improve signal distribution and performance. The output feedline is coupled to the compensation resonator. In general, the compensation resonator is configured to resonate with the distribution network at the frequency band of the signal. Thus, the distribution network and compensation resonator together can provide improved signal distribution while maintaining performance at the frequencies of interest. | 02-05-2015 |