With Amplifier Bypass Means (e.g., Forward Feed) Patents (Class 330/151)
  • Patent number: 10264325
    Abstract: A frequency band selection device that can be inserted into a signal transmission line of a CATV system on the premise of a user includes at least two signal path sets between a tap side and a premise side. Each signal path set includes two discrete signal paths, a high frequency signal path for a downstream bandwidth and a low frequency signal path for an upstream bandwidth. The high frequency signal path and the low frequency signal path are separated by a cut-off transition frequency that is different for each signal path set. The device further includes a switch controller having at least two discrete switch positions. The switch controller chooses one of the switch positions as a result of an information signal. Each of the switch positions corresponds to a respective one of the signal path sets.
    Type: Grant
    Filed: February 22, 2016
    Date of Patent: April 16, 2019
    Assignee: PPC BROADBAND, INC.
    Inventors: Thomas A. Olson, David Kelma, Joseph Lai, Steven K. Shafer
  • Patent number: 10236865
    Abstract: An attenuator having an impedance that is controllable by a first setpoint signal is coupled to a transmission line. A matching circuit having an impedance that is controllable by a second setpoint signal is also coupled to the transmission line. A transformer circuit block also coupled to the transmission line has a complex impedance. A control circuit sets the first and second setpoint signals so as to control a conjugate impedance relationship between the variable impedances presented by the attenuator and matching circuit relative to the complex impedance of the transformer circuit.
    Type: Grant
    Filed: April 13, 2018
    Date of Patent: March 19, 2019
    Assignee: STMicroelectronics SA
    Inventors: Bruno Grelaud, Sebastien Pruvost
  • Patent number: 10199989
    Abstract: Described examples include Ethernet physical layer (PHY) interface integrated circuits with transmit interface circuitry for transmitting data to an Ethernet network through a magnetic interface, which includes a voltage mode first amplifier with an output that generates a first voltage signal from a supply voltage according to a data input signal. The transmit interface circuit also includes a feedforward second amplifier circuit with an output stage that operates in a first mode to generate a current signal from the supply voltage according to the first voltage signal and to provide the current signal to the first amplifier output to boost a peak voltage at the output above the supply voltage to facilitate support for higher peak signal voltage swings for 10Base-T applications while using 2.5 volt or other low voltage supply levels.
    Type: Grant
    Filed: September 10, 2015
    Date of Patent: February 5, 2019
    Assignee: Texas Instruments Incorporated
    Inventors: Sumantra Seth, Ashwin Ramachandran, Gururaj Ghorpade
  • Patent number: 10141964
    Abstract: A CMOS channel select filter for DVB-H direct-conversion receives based on a transresistance amplifier (TRA) is disclosed. The channel select filter includes a fully differential transresistance amplifier (FDTRA) configured to change an input current at each differential input terminal to a voltage at each differential output terminal based on an impedance at a corresponding differential impedance terminal. The channel select filter also includes two feedback resistors, each having one end connected to a respective differential output terminal of the FDTRA and having another end connected to the node, two first capacitors, each connected between ground and the node, and two second capacitors, each connected between ground and a respective differential impedance terminal.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: November 27, 2018
    Assignee: King Fahd University of Petroleum and Minerals
    Inventor: Hussain Alzaher
  • Patent number: 10079576
    Abstract: There is disclosed an envelope tracking modulated supply arranged to generate a modulated supply voltage in dependence on a reference signal, comprising a low frequency path for tracking low frequency variations in the reference signal and including a switched mode power supply, a correction path for tracking high frequency variations in the reference signal and including a linear amplifier, a feedback path from the output of the linear amplifier to the input of the linear amplifier, and a combiner for combining the output of the switched mode power supply and the output of the linear amplifier to generate a modulated supply voltage.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: September 18, 2018
    Assignee: SNAPTRACK, INC.
    Inventor: Gerard Wimpenny
  • Patent number: 10063906
    Abstract: Methods and systems for multi-path video and network channels may comprise a communication device comprising a wideband tuner (WB) and a narrowband tuner (NB). A video channel and a network channel may be received in the WB when the device is operating in a first stage. A video channel and a network channel may be received in the WB and the network channel may also be received in the NB when the device is operating in a second stage. The network channel may be received in the NB when the device is operating in a third stage. The reception of the network channel from both the WB and NB may enable a continuous reception of the network channel in a transition between the first and third stages. The WB may be operable to receive a plurality of channels and the NB may be operable to receive a single channel.
    Type: Grant
    Filed: February 7, 2017
    Date of Patent: August 28, 2018
    Assignee: Maxlinear, Inc.
    Inventors: Anand Anandakumar, Sheng Ye, Curtis Ling
  • Patent number: 10044495
    Abstract: Embodiments of the present invention provide a apparatus. The apparatus includes: N timing phase adjusters, a level calculator, and a first selector, where N is an integer greater than or equal to 2; the timing phase adjuster is configured to perform phase adjustment on a first signal according to a phase adjustment value, to obtain an adjusted first signal, where the first signal is a baseband signal, and the N timing phase adjusters respectively correspond to different phase adjustment values; the level calculator is configured to acquire level fluctuation values, within a preset time, of N adjusted first signals, determine an identifier of an adjusted first signal corresponding to a minimum level fluctuation value, and send the identifier to the first selector; and the first selector is configured to output the adjusted first signal corresponding to the identifier.
    Type: Grant
    Filed: October 3, 2016
    Date of Patent: August 7, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Rui Lyu
  • Patent number: 9985588
    Abstract: A radio-frequency (RF) module includes a driver transistor having a base, collector and emitter, an RF input port coupled to the base of the driver transistor, a cascode transistor having a base, collector and emitter, the emitter of the cascode transistor being coupled to the collector of the driver transistor, an RF output port coupled to the collector of the cascode transistor, and a coupling path connecting the base of the cascode transistor to the emitter of the cascode transistor, the coupling path including a capacitor.
    Type: Grant
    Filed: November 3, 2016
    Date of Patent: May 29, 2018
    Assignee: Skyworks Solutions, Inc.
    Inventor: John William Mitchell Rogers
  • Patent number: 9917553
    Abstract: A circuit and method for an audio op-amp that is configured to minimize crossover distortion between push and pull components of the audio op-amp. The audio op-amp includes an input stage that receives differential input signals and generates an output that amplifies the difference between the input signals. The audio op-amp further includes an output stage that receive the amplified signal and generate an audio output signal for playback by a speaker system. The output stage includes a diamond driver circuit that buffers the input stage from the speaker system, a boost circuit that includes a pair of boosting transistors that amplify the current of the amplified signal, and a biasing circuit that provides bias currents to the transistors of the boost circuit in a manner that minimizes crossover distortion between the boosting transistors.
    Type: Grant
    Filed: June 20, 2016
    Date of Patent: March 13, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Sergey V. Alenin, Steven G. Brantley
  • Patent number: 9906177
    Abstract: A low-frequency band suppression enhanced anti-reversal power system stabilizer is presented by the invention. Currently the widely used PSS2B power system stabilizer needs lead elements above Order 2 to meet the phase compensation requirement of DC blocking signal of active power, thus quickly increasing high-frequency band gain, restricting allowable total setting gain of PSS, limiting low-band gain and reducing low-frequency band suppression ability of power system stabilizer. The invention will add generator speed signal ? (which is treated by DC blocking element and corrected by parallel proportional differential PD) and active power signal Pe (which is treated by DC blocking element and gained by gain factor Ks3) to get equivalent synthetic mechanical power of power system stabilizer.
    Type: Grant
    Filed: April 13, 2016
    Date of Patent: February 27, 2018
    Assignees: STATE GRID ZHEJIANG ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID CORPORATION OF CHINA, NR ELECTRIC CO., LTD
    Inventors: Kuayu Wu, Cencen Lu, Long Wu, Xiaoming Huang, Chengyu Lu, Boliang Lou, Bing Han, Jiahua Lu, Hongtao Xiong, Yijun Shen, Haiqing Lu
  • Patent number: 9899966
    Abstract: A device, system and method for a wideband low noise amplifier is provided. The device may include a main amplifier and an error amplifier. In each amplifier is a phase inverter configured to invert the incoming signal. Additionally, rather than being formed from discrete components, the conductors of this wideband low noise amplifier are formed from microwave monolithic integrated circuits to provide for greater efficiency, which enables the low noise amplifier to operate in wideband rather than narrowband. A method of using the same is also provided.
    Type: Grant
    Filed: June 16, 2016
    Date of Patent: February 20, 2018
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: James J. Komiak
  • Patent number: 9813265
    Abstract: Systems and methods for determining the DC offset of a wireless device including the antenna are disclosed. Systems and methods for calibrating or cancelling the DC offset are also disclosed.
    Type: Grant
    Filed: April 14, 2015
    Date of Patent: November 7, 2017
    Assignee: GainSpan Corporation
    Inventor: Qiang Lin
  • Patent number: 9780739
    Abstract: A device and method for controlling reproduction of an audio signal is provided, wherein the device is operated by means of an energy storage device. The method comprises the steps of deactivating a normal mode and activating an energy saving mode. Power consumption from the energy storage device for reproduction of the audio signal is reduced in the energy saving mode when compared to the normal mode. The method comprises reducing in the energy saving mode, a bass frequency component of a frequency spectrum of the audio signal and outputting the audio signal with reduced bass frequency component. The method further comprises ascertaining a charge state of the energy storage device and controlling the reduction in the bass frequency component based on a decrease in the charge state of the energy storage device.
    Type: Grant
    Filed: October 12, 2012
    Date of Patent: October 3, 2017
    Assignee: Harman Becker Automotive Systems GmbH
    Inventors: Tobias Muench, Philipp Schmauderer, Christoph Benz, Andreas Koerner
  • Patent number: 9762416
    Abstract: The disclosure provides circuitry and methods to determine the reflection coefficient of a transmission line connected another physical element or device such as an antenna. The outgoing and the reflected signals on the transmission line are compared using two separate paths, with one path going through a signal conditioning circuitry such as an equalizer. The two paths are then combined and detected. A lookup table may be used for non-linear responses.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: September 12, 2017
    Assignee: Abtum Inc.
    Inventor: Sam Mandegaran
  • Patent number: 9742360
    Abstract: A novel and useful linear, efficient, smart wideband CMOS hybrid power amplifier that combined an analog linear amplification path and a digital power amplification (DPA) path. PA path control logic analyzes the input I and Q signals and determines which amplification paths to steer the input I and Q signals to. The analog linear amplification path comprises digital to analog converters for both I and Q paths and one or more analog linear power amplifiers. The digital power amplification path comprises I and Q up-sampling circuits and I and Q RF DAC circuits (e.g., digital PA circuits). In operation, the PA path control logic compares the I and Q signals to thresholds (which may or may not be different) and based on the comparisons, selects one or more paths for the input I and Q signals. Whether the signals from the analog and digital amplification paths are to be combined or selected (i.e.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: August 22, 2017
    Assignee: DSP GROUP LTD.
    Inventors: Sergey Anderson, Udi Suissa
  • Patent number: 9735742
    Abstract: Disclosed is a multi-port power amplifier (“MPA”) having an input hybrid matrix (“IHM”), an output hybrid matrix (“OHM”), and a plurality of high-power amplifier (“HPA”) chains. The MPA may include a plurality of adjustable delay modules (“ADMs”) in signal communication with the IHM and the plurality of HPA chains. Each adjustable delay module (“ADM”) of the plurality of ADMs may be in signal communication with the IHM and a corresponding HPA chain of the plurality of HPA chains.
    Type: Grant
    Filed: July 21, 2015
    Date of Patent: August 15, 2017
    Assignee: The Boeing Company
    Inventors: Daniel S. Roukos, John A. Fleming
  • Patent number: 9690957
    Abstract: RFID systems are disclosed that include at least one RFID receiver system and a distributed exciter architecture. Exciters can be connected via wired and/or wireless connections to the RFID receiver system, which can control activation of the exciters to detect the presence of RFID tags within interrogation spaces defined by the exciter topology. One embodiment includes an RFID receiver system configured to detect information from RFID tags within a receive coverage area, and a plurality of exciters defining a plurality of interrogation spaces within the receive coverage area of the receiver system. The receiver system is configured to transmit a control signal that identifies one of the exciters and includes information indicative of an RFID tag interrogation signal, the exciters are configured to receive the control signal, and the exciter identified in the control signal is configured to illuminate an interrogation space with the RFID tag interrogation signal.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: June 27, 2017
    Assignee: Mojix, Inc.
    Inventors: Ramin Sadr, John Gevargiz, Robert Lee, Majid Manteghi, Gordon Oliver, Michael Collender, Christopher Jones, Syed Hassan Yousaf
  • Patent number: 9660587
    Abstract: A power amplifier (PA) has been disclosed for linearity improvement. The PA comprises at least an amplifying transistor and at least an auxiliary transistor. Each amplifying transistor of the at least an amplifying transistor includes a first terminal for receiving an input signal of the PA, a second terminal for delivering an output signal of the PA, and a third terminal. Each auxiliary transistor of the at least an auxiliary transistor includes a first terminal, a second terminal coupled to the second terminal of the at least an amplifying transistor, and a third terminal electrically connected to the first terminal of the at least an amplifying transistor.
    Type: Grant
    Filed: October 14, 2015
    Date of Patent: May 23, 2017
    Assignee: WIN Semiconductors Corp.
    Inventors: Fan-Hsiu Huang, Jui-Chieh Chiu, Chih-Wen Huang
  • Patent number: 9641130
    Abstract: A low noise amplifier (LNA) has been disclosed for the noise and linearity performance improvement. The LNA includes an amplifying transistor and an auxiliary transistor. The amplifying transistor includes a first terminal for receiving an input signal of the LNA, a second terminal for outputting an output signal of the LNA, and a third terminal. The auxiliary transistor has a first terminal, a second terminal coupled to the second terminal of the amplifying transistor, and a third terminal electrically connected to the first terminal of the amplifying transistor.
    Type: Grant
    Filed: October 14, 2015
    Date of Patent: May 2, 2017
    Assignee: WIN Semiconductors Corp.
    Inventors: Fan-Hsiu Huang, Jui-Chieh Chiu, Chih-Wen Huang
  • Patent number: 9634809
    Abstract: The present invention discloses a mobile communications terminal. The mobile communications terminal includes a signal processing module and a radio frequency power amplifier, where the signal processing module outputs, to a radio frequency signal input end of the radio frequency power amplifier, a radio frequency signal corresponding to one group of data packets, and synchronously outputs an enable signal to an enable signal input end of the radio frequency power amplifier; and the signal processing module periodically stops outputting the enable signal to the enable signal input end within first predetermined duration, and outputs, to the radio frequency signal input end, a radio frequency signal corresponding to at least one piece of pilot data and synchronously outputs the enable signal to the enable signal input end within second predetermined duration.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: April 25, 2017
    Assignee: HUAWEI DEVICE CO., LTD.
    Inventors: Zhangong Zhang, Meifang Zhong
  • Patent number: 9479198
    Abstract: Disclosed herein are an analog compensation circuit and a method for tuning an analog compensator in full-duplex transmission systems. An embodiment analog compensation circuit includes a secondary receiver configured to receive and convert a sampled self-interference signal to a baseband self-interference signal. A tuner is coupled to the secondary receiver and configured to receive a baseband transmit signal and the baseband self-interference signal, and to compute complex gains according to the baseband transmit signal and the baseband self-interference signal. An analog compensator is coupled to the tuner and has multiple branches. The analog compensator is configured to receive the complex gains and use them to adjust respective attenuators and phase shifters of the branches. The analog compensator is further configured to process a sample of a transmit signal using the branches, the transmit signal being up-converted from a new baseband transmit signal.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: October 25, 2016
    Assignee: HUWAEI TECHNOLOGIES CO., LTD.
    Inventors: Michael Moher, James Gary Griffiths
  • Patent number: 9405332
    Abstract: A linear amplifier circuit includes a multi-stage power amplifier that can amplify an input signal to produce an output signal, and a gain feedback control circuit coupled with the output and the input of the multi-stage power amplifier. An adjacent-channel leakage feedback control circuit can detect the output signal at the output of the multi-stage power amplifier and reduce adjacent-channel leakage in the output signal over an output power range based on the detected output signal.
    Type: Grant
    Filed: July 20, 2015
    Date of Patent: August 2, 2016
    Assignee: MICRO MOBIO CORPORATION
    Inventors: Ikuroh Ichitsubo, Musaya Kuwano, Koshiro Matsumoto
  • Patent number: 9369095
    Abstract: An unbalanced linear power amplifier (PA) is disclosed having a quadrature coupler with a 90° phase input port, a 0° phase input port, an output termination port, and a signal output port. Each of the 90° phase input port, the 0° phase input port, the output termination port, and the signal output port have a characteristic resistance (Ro). Also included is a first PA having an output coupled to a 90° phase input port of the quadrature coupler and a second PA having an output coupled to a 0° phase input port of the quadrature coupler. Biasing circuitry provides the first PA and the second PA with a similar gain. A tuning network is coupled between the output termination port and ground. The tuning network has an isolation resistance in series with an isolation inductance, wherein the isolation resistance is between about 0.02*Ro ? and 0.8*Ro ?.
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: June 14, 2016
    Assignee: RF Micro Devices, Inc.
    Inventor: Kevin Wesley Kobayashi
  • Patent number: 9331670
    Abstract: A hybrid load pull tuner system uses a combination of a passive and active tuner system. A closed loop system means that the system is independent of the available power of the device under test (DUT). The proposed hybrid system is formed around a closed loop Gamma Boosting Unit (GBU) consisting of two back to back broadband directional couplers, broadband variable time-delay, broadband variable phase-shifter and a broadband microwave amplifier, all inserted in the coupled path of the couplers; the GBU is connected in cascade with a passive tuner and boosts its reflection factor; for this the amplifier must have enough linear power and gain to match the difference between the power reflected back to the DUT by the passive tuner and the desired total reflected power to reach the expected Gamma, considering coupling loss and insertion loss of the test fixture.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: May 3, 2016
    Inventors: Reza Mahmoudi, Foad Arfaei Malekzadeh, Jacobus A. J. Essing
  • Patent number: 9237047
    Abstract: A circuit for receiving data in an integrated circuit is described. The circuit comprises a receiver configured to receive an input signal and to generate output data based upon the input signal, the receiver having a level detection circuit coupled to receive the input signal; and a calibration circuit coupled to the receiver, the calibration circuit having an input for receiving the input signal; an error detection circuit coupled to the input, the error detection circuit coupled to receive the input signal, a first reference voltage and a second reference voltage; and a control circuit coupled to an output of the error detection circuit, wherein the control circuit selectively generates either an offset control signal or an amplitude control signal based upon comparisons of the input signal to the first reference voltage and the second reference voltage. A method of receiving data is also disclosed.
    Type: Grant
    Filed: April 17, 2015
    Date of Patent: January 12, 2016
    Assignee: XILINX, INC.
    Inventors: Hongtao Zhang, Geoffrey Zhang, Patrick Satarzadeh, Zhaoyin D. Wu
  • Patent number: 9099966
    Abstract: An apparatus and method linearize a power amplifier in a transmitter by using a dual time alignment scheme. A first adjustable time delay unit delays a modulator signal input of a power amplifier. A first time delay estimator estimates a time delay between the delayed feedback signal and the reference signal, and adjusts the first adjustable time delay unit based on the estimated time delay between the delayed feedback signal and the reference signal. A second adjustable time delay unit delays the feedback signal. And a second time delay estimator estimates the time delay between the delayed feedback signal and the reference signal, and adjusts the second adjustable time delay unit based on the estimated time delay between the delayed feedback signal and the reference signal.
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: August 4, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Khalil C. Haddad
  • Patent number: 9048817
    Abstract: An apparatus for active feed forward electromagnetic interference (EMI) filtering, including, a noise detection and current reconstruction circuit that receives EMI noise occurring at a noise source, and noise voltage compensation circuit operatively coupled to the noise detection and current reconstruction circuits. The active feed forward circuit generates a noise voltage compensation signal based on the EMI noise reconstructed by the noise detection circuit.
    Type: Grant
    Filed: January 23, 2014
    Date of Patent: June 2, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Miaosen Shen
  • Patent number: 8995932
    Abstract: Systems and methods for suppressing transmitter noise in a receive band of a co-located receiver that are suitable for wideband applications are disclosed. In one embodiment, an analog radio frequency transmit signal output by a transmitter includes a desired signal in a transmit band of the transmitter and transmitter noise in a receive band of a main receiver. A secondary receiver obtains a secondary receiver input signal that is representative of at least the transmitter noise in the receive band of the main receiver and outputs a digital feedforward signal. A digital feedforward transmit noise cancellation subsystem generates a digital transmitter noise cancellation signal that is representative of the transmitter noise in the receive band based on the digital feedforward signal and subtracts the digital transmitter noise cancellation signal from a digital receive signal output by the main receiver to thereby provide a compensated digital receive signal.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: March 31, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Mark Wyville
  • Patent number: 8994436
    Abstract: According to one embodiment, there is provided a semiconductor device including a first amplifier and a second amplifier. The first amplifier has an input terminal to receive a first signal and an output terminal to output a second signal. The second amplifier is configured to receive the first signal and a correction data, to generate a correction signal according to the first signal and the correction data, and to output the generated correction signal to the output terminal of the first amplifier so as to add the first signal and the generated correction signal.
    Type: Grant
    Filed: March 20, 2013
    Date of Patent: March 31, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takafumi Yamaji, Yosuke Ogasawara
  • Patent number: 8989253
    Abstract: A technique for a reconditioning equalizer filter for non-constant envelope signals is described. The input to a transmitter chain is modified by a reconditioning equalizer filter, prior to being applied to the transmitter. The reconditioning equalizer filter modifies and smoothens the amplitude of the signal. The modified and smoothened signal has its peaks reduced which results in lower Crest Factor. The input to the reconditioning equalizer filter could be a baseband, intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal, it needs to be down-converted to baseband before being applied to the reconditioning equalizer filter. The reconditioning equalizer filter could be performed in a digital or analog domain.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: March 24, 2015
    Assignee: Altera Corporation
    Inventor: Kiomars Anvari
  • Patent number: 8965454
    Abstract: In one embodiment, an amplifier system has a tap, a delay filter, a linearized amplifier, and a hybrid combiner. The tapped portion of an input signal is amplified by the amplifier, the untapped portion of the input signal is delayed by the delay filter, and the combiner combines the resulting amplified, tapped portion and the delayed, untapped portion to generate an amplified output signal. By re-combining the delayed, untapped portion of the input signal with the amplified, tapped portion, the power of the untapped portion is not lost, and the amplifier does not have to compensate for all of the distortion that would otherwise be associated with the total output power level. Such an amplifier system is applicable, for example, in upgrading an existing GSM cell site to support both GSM communications as well as UMTS communications without degrading GSM operations.
    Type: Grant
    Filed: March 4, 2009
    Date of Patent: February 24, 2015
    Assignee: Andrew LLC
    Inventors: George P. Vella-Coleiro, Josef Ocenasek, Jeffrey G. Strahler, Christopher F. Zappala
  • Patent number: 8909185
    Abstract: A method of providing frequency dependent signal attenuation. An RF input signal is split into a first signal portion and a second signal portion. Discrete time filtering, a negative group delay and bandstop filtering are applied to the first signal portion to provide a filtered signal portion. The second signal portion is applied to a component, and a component output signal portion is received from the component. The component output signal portion is combined with the filtered signal portion to provide an RF output signal having frequency dependent attenuation.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: December 9, 2014
    Assignee: Rockstar Consortium US LP
    Inventor: Mark Wyville
  • Patent number: 8908797
    Abstract: An apparatus and method for a Time Alignment (TA) operation used by an Envelope Tracking (ET) Radio Frequency (RF) Power Amplifier (PA) that amplifies RF signals are provided. The ET RF PA has an input signal including complex, reference, and feedback signals. The apparatus includes a fast convolution unit for receiving the reference signal and the feedback signal, fore extracting respective envelopes of the reference signal and the feedback signal, for generating a cross-covariance vector for the reference signal envelope and the feedback signal envelope, a delay estimation unit for receiving the cross-covariance vector from the fast convolution unit, for determining peak values of the cross-covariance vector, for performing a fine time delay estimation, and for generating time delay settings according to the fine time delay estimation, and delay filters respectively delaying a timing of the reference signal and the feedback signal according to the generated time delay settings.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: December 9, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Ernesto G. Jeckeln
  • Patent number: 8854131
    Abstract: In an example embodiment, a method for bidirectional signal propagation comprises: a) sensing a voltage level of a first signal at a first port; b) coupling the first port to an output of an amplifier with a solid state switch if the voltage level of the first signal is less than a threshold voltage, whereby a second signal applied to a second port coupled to an input of the amplifier is propagated in a first direction from the second port to the first port; and c) bypassing the amplifier if the voltage level of the first signal is greater than the threshold voltage such that the first signal is propagated in a second direction from the first port to the second port.
    Type: Grant
    Filed: June 17, 2013
    Date of Patent: October 7, 2014
    Assignee: MAXIM Integrated Products, Inc.
    Inventors: Luigi Franchini, Diego Maiocchi, Roberto Amadio
  • Publication number: 20140266433
    Abstract: Methods and systems for optimizing amplifier operations are described. The described methods and systems particularly describe a feed-forward control circuit that may also be used as a feed-back control circuit in certain applications. The feed-forward control circuit provides a control signal that may be used to configure an amplifier in a variety of ways.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: Peregrine Semiconductor Corporation
    Inventor: Peregrine Semiconductor Corporation
  • Patent number: 8824991
    Abstract: A multi-mode power amplifier includes a high-power mode amplifier circuit, a mid-power mode amplifier circuit, and a low power amplifier circuit, where the low-power mode amplifier circuit comprises a plurality of independently selectable power cell/amplifier branches. The multi-mode power amplifiers selectively enable or disable amplifier branches to provide multiple levels of amplification. Selectively enabling certain of a plurality of split collector amplifier branches provides multiple low power and ultra-low power amplifier modes without the impedance mismatch or board layout problems associated with an RF switch.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: September 2, 2014
    Assignee: Skyworks Solutions, Inc.
    Inventors: Shiaw Wen Chang, Xuejun Chen, Guohao Zhang, Jing Sun, Piyou Zhang, Jinim Won
  • Patent number: 8787438
    Abstract: A technique for a reconditioning equalizer filter for non-constant envelope signals is described. The input to a transmitter chain is modified by a reconditioning equalizer filter, prior to being applied to the transmitter. The reconditioning equalizer filter modifies and smoothens the amplitude of the signal. The modified and smoothened signal has its peaks reduced which results in lower Crest Factor. The input to the reconditioning equalizer filter could be a baseband, intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal, it needs to be down-converted to baseband before being applied to the reconditioning equalizer filter. The reconditioning equalizer filter could be performed in a digital or analog domain.
    Type: Grant
    Filed: December 23, 2013
    Date of Patent: July 22, 2014
    Assignee: Altera Corporation
    Inventor: Kiomars Anvari
  • Patent number: 8766719
    Abstract: A digitally-controlled power amplifier (DPA) with bandpass filtering includes a radio-frequency (RF) clock input, an amplitude control word (ACW) input, and a plurality of DPA cells. The RF clock input is arranged for receiving an RF clock. The ACW input is arranged for receiving a digital ACW signal. The DPA cells are coupled to the RF clock and the digital ACW signal, wherein at least one of the DPA cells is gradually turned on and off in response to at least one bit of the digital ACW signal.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: July 1, 2014
    Assignee: Mediatek Inc.
    Inventors: Jie-Wei Lai, Meng-Hsiung Hung, Robert Bogdan Staszewski
  • Patent number: 8643433
    Abstract: Embodiments of a two-stage bypass power amplifier are provided. In general, the two-stage bypass power amplifier is configured to receive a RF signal that is to be transmitted to a remote device and provide gain to the RF signal prior to the RF signal being transmitted to the remote device. The two-stage bypass power amplifier is configured to operate efficiently (in terms of power) at two different gain or output power levels and can be extended to operate efficiently at additional gain or output power levels.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: February 4, 2014
    Assignee: Broadcom Corporation
    Inventors: Min-Chung Ho, Shao-Min Hsu, Philippe Riondet, Seunghwan Yoon, Alfred Grau Besoli, Hooman Darabi, Rahul Magoon
  • Publication number: 20140015605
    Abstract: In an example embodiment, a method for bidirectional signal propagation comprises: a) sensing a voltage level of a first signal at a first port; b) coupling the first port to an output of an amplifier with a solid state switch if the voltage level of the first signal is less than a threshold voltage, whereby a second signal applied to a second port coupled to an input of the amplifier is propagated in a first direction from the second port to the first port; and c) bypassing the amplifier if the voltage level of the first signal is greater than the threshold voltage such that the first signal is propagated in a second direction from the first port to the second port.
    Type: Application
    Filed: June 17, 2013
    Publication date: January 16, 2014
    Applicant: Maxim Integrated Products, Inc.
    Inventors: Luigi Franchini, Diego Maiocchi, Roberto Amadio
  • Patent number: 8618880
    Abstract: The present invention is directed to systems and methods for reducing the distortion of power amplifiers. In particular, methods and systems are described that enable a determination of a pre-distortion correction signal to be determined, which when added to the nominal signal, a reduction in the distortion of the power amplifier results. In addition, methods and systems are described that enable calibration of individual power amplifiers to be accomplished for use with the above described approach. More specifically, the methods and systems are described for use in a MIMO application. These approaches may be applied to on-chip power amplifiers, off-chip power amplifiers, or any combination thereof.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: December 31, 2013
    Assignee: Broadcom Corporation
    Inventors: Christopher Young, Elias Simpson
  • Patent number: 8619847
    Abstract: A technique for a reconditioning equalizer filter for non-constant envelope signals is described. The input to a transmitter chain is modified by a reconditioning equalizer filter, prior to being applied to the transmitter. The reconditioning equalizer filter modifies and smoothens the amplitude of the signal. The modified and smoothened signal has its peaks reduced which results in lower Crest Factor. The input to the reconditioning equalizer filter could be a baseband, intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal, it needs to be down-converted to baseband before being applied to the reconditioning equalizer filter. The reconditioning equalizer filter could be performed in a digital or analog domain.
    Type: Grant
    Filed: November 24, 2006
    Date of Patent: December 31, 2013
    Assignee: Altera Corporation
    Inventor: Kiomars Anvari
  • Patent number: 8610499
    Abstract: An apparatus and technique for operating an RF amplifier having a pre-distortion processor and a drain modulation circuit includes generating a compensating drain bias signal having a value which is a function of an RF input signal, a sampled RF output signal and a sampled drain bias signal. The compensating drain bias signal is applied to the RF amplifier. By sampling both the drain bias signal and the RF output signal and providing drain feedback and RF output feedback signals to a pre-distortion processor, RF amplifier distortions can be linearized enabling the RF amplifier to operate over a bandwidth which exceeds the bandwidth of the drain modulation circuit (i.e., the RF bandwidth can exceed the bandwidth of the drain modulator).
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: December 17, 2013
    Assignee: Auriga Measurement Systems, LLC
    Inventor: Mark A. Royer
  • Patent number: 8582694
    Abstract: The present invention provides a high-performance adaptive digital receiver with adaptive background control that optimizes the performance in rapidly changing signal environments and provides 3.6 GH; instantaneous bandwidth, SFDR>90 dB, SNR=66 dB, with dynamic digital channelization. The receiver takes advantage of several levels of adaptivity that conventional approaches do not offer. In addition to a dynamic digital channelizer that is adaptively tuned based on detected signals, the present invention employs a powerful software reconfigurable digitizer that is adaptively optimized for the current signal environment to control important receiver parameters such as bandwidth, dynamic range, resolution, and sensitivity.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: November 12, 2013
    Inventors: Scott R. Velazquez, Rich J. Velazquez
  • Patent number: 8576945
    Abstract: A system for and method of amplifying a modulated input signal can include separating the input signal into a first amplitude component signal and a first amplitude composite signal (e.g., an amplitude only component signal). The method further includes subtracting the first amplitude composite signal from the input signal to provide a difference signal. The method also includes amplifying the difference signal asymmetrically with respect to the first amplitude composite signal. The method can also include adding the difference signal and the first amplitude composite signal after asymmetric amplification. The power amplifier supply voltage can be powered as a function of the first amplitude component signal. The mathematical operations can be performed in the digital domain.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: November 5, 2013
    Assignee: Rockwell Collins, Inc.
    Inventor: William B. Sorsby
  • Patent number: 8520767
    Abstract: A transmission circuit adjust a difference between signal delay amounts in an amplitude path and a phase path with a low power consumption. An amplitude modulation section amplitude-modulates a phase modulation signal outputted from a phase modulation section with a voltage control signal provided by a regulator to generate a transmission signal for an output of an antenna. Similarly, a feedback signal generation section amplitude-modulates the phase modulation signal with a voltage control signal to generate a feedback signal. The signal is fed back to a delay adjustments sections used for calculating and adjusting the difference between the signal delay amounts in the amplitude path and the phase path. The feedback signal generation section is attained by a power amplifier having the same configuration as the amplitude modulation section and a smaller circuit scale.
    Type: Grant
    Filed: December 28, 2010
    Date of Patent: August 27, 2013
    Assignee: Panasonic Corporation
    Inventors: Yukihiro Omoto, Shigeru Morimoto
  • Patent number: 8519790
    Abstract: Linearizers can improve the linearity of power amplifiers by canceling or reducing amplitude of non-linearity components, (e.g., IM3, IM5, IM7, IM9, etc.) generated by the power amplifier. The linearizers can obtain samples of signals output by the power amplifier and process the samples to produce a canceling signal that is applied onto or into an output of the power amplifier. The canceling signal is generated such that when applied to the output of the power amplifier, the canceling signal cancels or reduces at least a portion of the non-linearity components produced by the power amplifier. A controller can improve the correction of the non-linearity components by executing one or more tuning algorithms and adjusting settings of the linearizer based on the results of the algorithm(s).
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: August 27, 2013
    Assignee: Intersil Americas Inc.
    Inventors: Wei Chen, Wilhelm Steffen Hahn
  • Publication number: 20130214862
    Abstract: Techniques for bypassing a supply voltage for an amplifier are disclosed. In an exemplary design, an apparatus includes an amplifier and an adjustable bypass circuit. The amplifier (e.g., a power amplifier) receives a supply voltage from a supply source. The adjustable bypass circuit is coupled to the supply source and provides bypassing for the supply voltage. The adjustable bypass circuit includes an adjustable capacitor or a fixed capacitor coupled to an adjustable resistor. The supply source may be (i) a power supply source providing a fixed supply voltage for the amplifier or (ii) an envelope tracker providing a variable supply voltage for the amplifier.
    Type: Application
    Filed: February 21, 2012
    Publication date: August 22, 2013
    Applicant: QUALCOMM INCORPORATED
    Inventors: Calogero D. Presti, Jose Cabanillas
  • Patent number: 8514020
    Abstract: A feedforward linearizer device is disclosed. The device includes a main amplifier, and a linearizing amplifier operatively coupled to the main amplifier. A first reference generator is operatively coupled to the main amplifier by a first reference node. A second reference generator is operatively coupled to the linearizing amplifier by a second reference node, and is configured to cause an optimal linearizing amplifier output current for each of a plurality of temperatures. In one such case, the second reference generator is configured to cause an optimal linearizing amplifier output current for each of a plurality of temperatures based on a corresponding optimal ratio of main amplifier output current and linearizing amplifier output current. The linearizing amplifier may be configured with a tunable current source that is controlled by the second reference generator, or a current source having a fixed total transistor area (not tunable).
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: August 20, 2013
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Thomas E. Collins, III, Gregory M. Flewelling
  • Patent number: 8498322
    Abstract: Interference-reducing circuits include a feed-forward circuit for subtracting all or part of a desired transmitter-signal component from a signal coupled from the power amplifier's output path. The error signal from this feed-forward circuit contains a replica of distortion in the power amplifier output. A cancellation loop adjusts the phase and/or amplitude of this error signal and combines this adjusted error signal with an interference-carrying signal, removing some of the undesired distortion. A spread-spectrum pilot signal is used in one or both loops, to provide a reference signal that can be monitored by an adjustment circuit, which measures the magnitude and/or phase of a spread-spectrum signal that is injected into the interference-carrying signal and, based on that measurement, adjusts the amplitude, phase, and/or delay of the cancellation signal that is added to the interference-carrying signal. This yields a reduced-interference signal in which undesired distortion is reduced.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: July 30, 2013
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Russell Clifford Smiley