Plural Amplifier Channels Patents (Class 330/84)
  • Patent number: 10256899
    Abstract: A power amplification system comprises a pre-processor including a wavefront multiplexer, a set of power amplifiers, and a post-processor including a wavefront demultiplexer. The wavefront multiplexer receives concurrently N input signals, N being an integer greater than 2, performs a wavefront multiplexing transform on the N input signals by attaching N wavefronts to the N input signals respectively, and generates N first output signals. The N wavefronts are unique and mutually orthogonal. The wavefront multiplexing transform has an inverse. The N power amplifiers amplify the N first output signals and generate N amplified signals. The wavefront demultiplexer performs the inverse of the wavefront multiplexing transform on the N amplified signals and generates N second output signals, the N second output signals corresponding respectively to the N input signals. Each of the N second output signals is an amplified version of a corresponding one of the N input signals.
    Type: Grant
    Filed: September 11, 2017
    Date of Patent: April 9, 2019
    Assignee: SPATIAL DIGITAL SYSTEMS, INC.
    Inventor: Donald C. D. Chang
  • Patent number: 9608579
    Abstract: Provided herein are apparatus and methods for low distortion composite amplifiers with high load current. In certain configurations, a composite amplifier can be a closed loop system which includes two or more amplifiers such that one or more amplifiers can provide an output current to a load while one or more amplifiers can control an output voltage to be proportional to an input voltage. The loop gain can be proportional to the product of the individual amplifier gains and to a noise gain network function. In this way the composite amplifier can maintain low distortion for heavier loads and for load currents which exceed the normal load current operation of a single amplifier.
    Type: Grant
    Filed: April 1, 2015
    Date of Patent: March 28, 2017
    Assignee: Analog Devices, Inc.
    Inventor: Gustavo Castro
  • Patent number: 9531325
    Abstract: A Doherty power amplifier circuit is provided, which includes a power divider circuit, and a power amplifier circuit connected with the power divider circuit; this Doherty power amplifier circuit further includes a combination output circuit connected with the power amplifier circuit, wherein the combination output circuit is a rheostat filter coupler, or a rheostat filter, or a rheostat coupler. By adopting the circuit, the size of a power amplifier circuit can be reduced, the cost of the power amplifier circuit can be lowered, and the efficiency of a power amplifier can be improved.
    Type: Grant
    Filed: September 18, 2013
    Date of Patent: December 27, 2016
    Assignee: ZTE Corporation
    Inventors: Minde Yu, Li Dai, Tianyin Qin, Wenyu Zhai
  • Patent number: 9444420
    Abstract: An amplifier comprises a main-amplifier circuit, an auxiliary-amplifier circuit and a signal-generating device. Output terminals of the main-amplifier circuit and of the auxiliary-amplifier circuit are connected according to the Doherty principle. The signal-generating device is configured to generate directly a main-amplifier signal as an input signal of the main-amplifier circuit and an auxiliary-amplifier signal as an input signal of the auxiliary-amplifier circuit.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: September 13, 2016
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Uwe Dalisda, Peter Mühlbacher
  • Patent number: 9187090
    Abstract: An object of the vehicle body vibration-damping control device according to the present invention is to achieve a targeted effect for damping the vehicle body vibration regardless of the responsiveness of an actuator for controlling the drive torque. The vehicle body vibration-damping control device has a body vibration estimating unit (205) for estimating a sprung mass behavior of a vehicle body based on input information during travel, and a torque command-value computing unit (206) for computing a correction torque value for correcting a drive torque command value applied to an engine (106) when the sprung mass behavior is controlled.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: November 17, 2015
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Yuuki Shiozawa, Shoji Kawaguchi, Yosuke Kobayashi
  • Patent number: 9077317
    Abstract: The invention relates to a method and an apparatus for automatically tuning an impedance matrix, for instance the impedance matrix seen by the power amplifiers of a radio transmitter using a plurality of antennas simultaneously, and to a radio transmitter using this apparatus. An apparatus for automatically tuning an impedance matrix has 4 user ports and 4 target ports, and comprises: 4 sensing units; a signal processing unit, the signal processing unit estimating real quantities depending on the impedance matrix presented by the user ports, using the sensing unit output signals obtained for 4 different excitations applied successively to the user ports; a multiple-input-port and multiple-output-port tuning unit comprising adjustable impedance devices; and a tuning control unit delivering tuning control signals to the multiple-input-port and multiple-output-port tuning unit, the reactance of each of the adjustable impedance devices being mainly determined by one or more of the tuning control signals.
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: July 7, 2015
    Assignee: TEKCEM
    Inventors: Frédéric Broyde, Evelyne Clavelier
  • Patent number: 9030255
    Abstract: Circuits and techniques to linearize the operation of an RF power amplifier are described. A linearizer circuit may include a non-amplification signal path which includes a delay line and an amplification signal path which includes at least one amplifier stage. In some embodiments, the amplification signal path may include an odd number of amplification stages. The linearizer may be used to precondition an input signal of an RF power amplifier in a manner that improves the overall linearity of operation.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: May 12, 2015
    Assignee: Auriga Measurement Systems, LLC
    Inventors: Cheryl V. Liss, Yusuke Tajima, Qin Shen-Schultz, John Muir
  • Patent number: 9014619
    Abstract: A satellite communications system includes a satellite configured to communicate with terminals, a station configured to communicate signals intended for the terminals to the satellite via a plurality of feeder links and a beamformer including an input multi-port hybrid matrix (MPHM) and a complementary output MPHM in a signal path with the plurality of feeder links. The output MPHM is positioned at the satellite and coupled to the input MPHM via the plurality of feeder links. For example, the input MPHM may be positioned at a ground-based satellite gateway. The input and output MPHMs may be configured to implement fully populated signal transformation matrices that collectively provide a substantially diagonal signal transformation matrix.
    Type: Grant
    Filed: May 22, 2007
    Date of Patent: April 21, 2015
    Assignee: ATC Technologies, LLC
    Inventors: Ted Benjamin, Matthew Griffin, William W. Chapman
  • 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: 8952752
    Abstract: A power-combined amplifier and method are provided. In one aspect, the power-combined amplifier and method overcome problems associated with decreased output power efficiency caused by phase mismatch between constituent amplifiers.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: February 10, 2015
    Assignee: Nuvotronics, LLC
    Inventor: Steven E. Huettner
  • Patent number: 8947160
    Abstract: A Lange coupler having a first plurality of lines on a first level and a second plurality of lines on a second level. At least one line on the first level is cross-coupled to a respective line on the second level via electromagnetic waves traveling through the first and second plurality of lines. The first and second plurality of lines may be made of metal, and the first level may be higher than the second level. A substrate may be provided into which the first and second plurality of lines are etched so as to define an on-chip Lange coupler.
    Type: Grant
    Filed: October 30, 2013
    Date of Patent: February 3, 2015
    Assignee: International Business Machines Corporation
    Inventors: Hanyi Ding, Kwan Him Lam
  • Patent number: 8928398
    Abstract: The even order harmonic distortion in a differential circuit is reduced or eliminated by treating the amplitude and phase mismatch sources that cause the distortion as impedance mismatches, and utilizing switched resistor circuitry that adjusts the load resistance to reduce the effects of the amplitude mismatch sources, and switched capacitor circuitry that adds shunt capacitance to reduce the effects of the phase mismatch sources.
    Type: Grant
    Filed: April 30, 2013
    Date of Patent: January 6, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Bumha Lee, Yongseon Koh
  • Patent number: 8902998
    Abstract: The invention relates to a receiver for a near-field chip-to-chip multichannel transmission system such as the capacitive or inductive links used for vertical signal transmission between the stacked chips of a system-in-package. A receiver for near-field chip-to-chip multichannel transmission providing 4 transmission channels for digital transmission between two monolithic integrated circuits comprises 4 coupling devices (211) (212) (213) (214), each of said coupling devices being a planar winding sensitive to magnetic field variations. A multiple-input-port and multiple-output-port amplifier (23) has 4 input ports, each of said input ports being connected to one and only one of said coupling devices (211) (212) (213) (214).
    Type: Grant
    Filed: May 24, 2011
    Date of Patent: December 2, 2014
    Assignee: Apple Inc.
    Inventors: Frederic Broyde, Evelyne Clavelier
  • Patent number: 8866545
    Abstract: A linearity power amplification device is provided. The device comprises a divider, a combiner, n?1 first signal paths, and a second signal path coupled between the divider and the combiner. The first signal path comprises a main invariable attenuator connected to the divider, a first power amplifier connected to the combiner, and a first attenuator and a first shifter coupled between the first power amplifier and the main invariable attenuator. The second signal path comprises a main amplification circuit, and an error calibration circuit.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: October 21, 2014
    Assignee: GE Medical Systems Global Technology Company
    Inventors: Haoyang Xing, Yu Liu, Anmou Liao, Chenxing Zhao, Kai Wang
  • Publication number: 20140266424
    Abstract: A system of detecting signal power may include a first interface port configured to receive a first signal. The system may also include a second interface port communicatively coupled to the first interface port and configured to receive a second signal. The second interface port may be communicatively coupled to the first interface port such that the first signal propagates from the first interface port to the second interface port and such that the second signal propagates from the second interface port to the first interface port. The system may further include a common signal detector communicatively coupled between the first interface port and the second interface port such that the common signal detector is configured to receive both the first and second signals and is configured to detect a first power level of the first signal and a second power level of the second signal.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: WILSON ELECTRONICS, LLC
    Inventors: Christopher K. Ashworth, James W. Wilson, Patrick L. Cook
  • Patent number: 8830008
    Abstract: A generator of a high-power modulated signal, a method for calibrating the generator, and a magnetic resonance imaging system. The generator includes means for generating a sinewave signal phase-shifted by a first variable value relative to a phase reference and a sinewave signal phase-shifted by a given fixed value added to a second variable value relative to the phase reference, the second variable value opposite to the first variable value relative to the phase reference, the variable values representative of the modulation of the radiofrequency signal, the two sinewave signals being of constant amplitude, two amplifiers each amplifying one of the sinewave signals in a congested regime, and a fixed phase shifter with a value equal to the given value of the means to generate the two sinewave signals, the fixed phase shifter coupling the signals originating from the two amplifiers to deliver the modulated radiofrequency signal.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: September 9, 2014
    Assignee: Thales
    Inventor: Bernard Darges
  • Publication number: 20140142458
    Abstract: Techniques for amplifying a plurality of input voltages to generate a corresponding plurality of output voltages. In an exemplary embodiment, each of the plurality of input voltages is referenced to a common voltage comprising the average of the plurality of input voltages, wherein for each of the input voltages, the common voltage is coupled to a common node via a corresponding switch.
    Type: Application
    Filed: January 24, 2014
    Publication date: May 22, 2014
    Inventors: Kent W. Leyde, Jaideep Mavoori
  • Publication number: 20140111444
    Abstract: An apparatus is provided. There is an input terminal that is configured to receive an input signal from a optical receiver and an output terminal. First and second integrators are coupled between the input and output terminals. In the second integrator, there is a current source that is coupled to the input terminal, a first resistor that is coupled to the output terminal, and a second resistor. Also, there is an amplifier having a first input, a second input, and an output, where the first resistor is coupled to the first input of the amplifier and where the second input of the amplifier is configured to receive a reference voltage. A transistor is coupled between the current source the second resistor and is coupled to the output of the amplifier at its gate. A capacitor is also coupled between the first input of the amplifier and the second resistor.
    Type: Application
    Filed: October 19, 2012
    Publication date: April 24, 2014
    Applicant: Texas Instruments Incorporated
    Inventors: Saska J. Lindfors, Matti Aaltonen, Jonne J. Lindeberg
  • Patent number: 8680918
    Abstract: A high-voltage driver amplifier for piezo haptics comprises an input amplifier having a gain greater than one, a first amplifier of an amplifier pair coupled to an output of the input amplifier, a second amplifier of the amplifier pair coupled to the output of the input amplifier, a first impedance coupled between an output of the first amplifier of the amplifier pair and an input of the input amplifier, and a second impedance coupled between the output of the first amplifier of the amplifier pair coupled to an output of the second amplifier of the amplifier pair. A substantially capacitive load is coupled to the output of the second amplifier. The substantially capacitive load is a piezo-capacitance, wherein the piezo-capacitance is employed in haptics. The second impedance, a shunt impedance, allows for a feedback of output variations between the first amplifier and the second amplifier over the first impedance.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: March 25, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Brett Earl Forejt, Mayank Garg, David John Baldwin
  • Patent number: 8654867
    Abstract: A method for generating an amplified radio frequency (RF) signal is provided. In-phase (I) and quadrature (Q) signals are received and interleaved so as to generate a time-interleaved signal. Delayed time-interleaved signals are then generated from the time interleaved signal, and each of the delayed time-interleaved signals is amplified so as to generate a plurality of amplified signals. The amplified signals are then combined with a transformer, where the delayed time-interleaved signals are arranged to generate a filter response with the transformer.
    Type: Grant
    Filed: December 7, 2011
    Date of Patent: February 18, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Rahmi Hezar, Lei Ding, Joonhoi Hur, Baher S. Haroun
  • Publication number: 20140009224
    Abstract: Included is a radio transmission system comprising a plurality of power amplifiers (PAs); a plurality of Volterra Engine (VE) linearizers corresponding to the PAs; a plurality of feedback loops corresponding to the PAs; at least one digital hybrid matrix (DHM) coupled to the VE linearizers; and an analog hybrid matrix (AHM) coupled to the PAs, wherein the feedback loops are connected to the AHM and the VE linearizers but not to the PAs to reduce the number of feedback loops. Also included is a radio system comprising a plurality of PAs; a Volterra DHM (VDHM) coupled to the PAs; a plurality of feedback loops corresponding to the PAs; and an AHM coupled to the PAs, wherein the feedback loops are connected to the AHM but not to the PAs to reduce the number of feedback loops.
    Type: Application
    Filed: July 3, 2012
    Publication date: January 9, 2014
    Inventors: John-Peter van Zelm, Peter Rashev
  • Patent number: 8618878
    Abstract: A multiport amplifier and a wireless device using the same are obtained in which isolation among output terminals is improved, whereby the quality of communication is improved. The multiport amplifier includes an input hybrid, an output hybrid, a plurality of amplifiers and a plurality of gain and phase control circuits that are inserted between the input hybrid and the output hybrid, a plurality of output coupling circuits that are inserted between the output hybrid and a plurality of output terminals so that they receive output extraction signals corresponding to a plurality of output signals, and a feedback circuit including a frequency selection circuit that is inserted between the plurality of output coupling circuits and the plurality of gain and phase control circuits.
    Type: Grant
    Filed: October 1, 2009
    Date of Patent: December 31, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masatake Hangai, Kazutomi Mori, Kenichi Tajima, Yukihiro Tahara, Morishige Hieda
  • Patent number: 8588334
    Abstract: A wireless communication system that includes a robust transmitter array. The robust transmitter array includes an antenna array system with at least one column, at least one antenna element, and at least one polarization, a plurality of transmitter devices to transmit analog voice/data signals through the antenna array system, and a signal processor. The signal processor modifies two or more input signals in the event of a transmitter device failure such that substantially similar amounts of each of the two or more input signals are output from the transmitter system to the antenna array system, and wherein substantially less transmitted signal power is lost than in the case wherein the signal processor does not modify the two or more input signals in the event of a transmitter failure.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: November 19, 2013
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Neil McGowan, Marthuinus Willem Da Silveira
  • Patent number: 8587374
    Abstract: An amplifier comprises a main amplification stage and an auxiliary amplification stage. An input of the main amplification stage and an input of the auxiliary amplification stage are coupled to a common node, and an output of the main amplification stage is coupled to an output node. During activation, before power is supplied to the main amplification stage, the output node is coupled to a reference voltage (VREF). A quiescent voltage is then established at the common node by coupling power to the auxiliary amplification stage. Only then is power coupled to the main amplification stage and the reference voltage (VREF) de-coupled from the output node.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: November 19, 2013
    Assignee: St-Ericsson SA
    Inventor: Robert Hwat Hian Teng
  • Patent number: 8581663
    Abstract: A system for multi-distributed amplification of a communication signal including at least one plurality N of input pathways connected to an input Butler matrix which delivers as output N distributed signals, a plurality N of tube amplifiers which receive as input said distributed signals and produce as output N amplified and phase-shifted signals each of a complex gain Gi and an output Butler matrix which receives as input said amplified signals and produces as output N output signals, wherein the phase error and amplitude error are self-compensated in the presence of traffic.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: November 12, 2013
    Assignee: Thales
    Inventors: Christian Tronche, Jean-Marc Soulie
  • Publication number: 20130113569
    Abstract: An operational amplifier can include a plurality of amplifiers connected to form a plurality of amplification paths extending from an input terminal to an output terminal of the operational amplifier. An amplifier in one of the amplification paths can include an intrinsic amplification-transistor capacitance connected between a first amplifier input and a first amplifier output, and a cross-coupling capacitor connected between the first amplifier input and a second amplifier output. A plurality of the amplification paths can include series-connected amplifiers connected in parallel with the cross-coupled amplifier. The cross-coupling capacitor can have a capacitance value selected as a function of the intrinsic capacitance and a gain experienced between the amplifier inputs and outputs. The operational amplifier can include an AC coupling capacitor connected in series with the cross-coupled amplifier. The operational amplifier can be arranged in feedback configuration.
    Type: Application
    Filed: November 9, 2011
    Publication date: May 9, 2013
    Applicant: ANALOG DEVICES, INC.
    Inventors: Hajime SHIBATA, Richard SCHREIER, Wenhua YANG
  • Publication number: 20130082771
    Abstract: A new type of amplifier, herein designated a resource pooling amplifier, involves extended usage of one or more inductors that is implemented by sharing. The sharing is either by switching the inductor or inductors among more than one load terminal at the same time (e.g., a bridged configuration or two different loads terminals with different polarity requirements) or by using the inductor or inductors for more than one purpose at different times. The inductor or inductors may be time shared such as by allocating different phases of a clock. The inductor or inductors may also be shared by monitoring load requirements and using the inductor or inductors only when needed (leaving other inductor cycles for other loads). In addition, inductor sharing may be implemented during different application requirements such as if two or more loads are not needed at the same time in a system. These types of sharing may be combined.
    Type: Application
    Filed: September 25, 2012
    Publication date: April 4, 2013
    Applicant: Clevech Corporation
    Inventor: Cary L. Delano
  • Patent number: 8400223
    Abstract: An amplifier arrangement with an amplifier arrangement input and an amplifier arrangement output is disclosed. The amplifier arrangement comprises a first transistor and a first ballast resistance, wherein the first ballast resistance connects a first transistor base of the first transistor to a common base terminal at least one second transistor and at least one second ballast resistance, wherein the at least one second ballast resistance connects a second transistor base of the at least second transistor to the common base terminal; and a feedback device comprising a feedback input terminal for sensing at least a base voltage of the first transistor and further comprising a feedback output terminal that is connected to the common base terminal.
    Type: Grant
    Filed: February 7, 2011
    Date of Patent: March 19, 2013
    Assignee: Ubidyne, Inc.
    Inventors: Udo Karthaus, Lothar Schmidt
  • Publication number: 20130063208
    Abstract: A transmitter that uses a digital pre-distortion (DPD) circuit to mitigate the effects of nonlinearity of a multistage or multi-branch power amplifier. The DPD circuit relies on two or more feedback signals received from an RF-output circuit of the transmitter to generate individually pre-distorted signals for the individual stages/branches of the power amplifier. The use of these individually pre-distorted signals advantageously enables the transmitter to achieve a more efficient suppression of inter-modulation-distortion products than that typically achieved with a comparable prior-art transmitter.
    Type: Application
    Filed: September 8, 2011
    Publication date: March 14, 2013
    Applicant: ALCATEL-LUCENT CANADA INC.
    Inventor: Igor Acimovic
  • Publication number: 20130049858
    Abstract: There is disclosed an amplifier arrangement comprising a plurality of amplifiers each arranged to amplify one of a plurality of different input signals, the arrangement comprising an envelope tracking modulator for generating a common power supply voltage for the power amplifiers, and further comprising an envelope selector adapted to receive a plurality of signals representing the envelopes of the plurality of input signals, and adapted to generate an output envelope signal representing the one of the plurality of envelopes having the highest level at a particular time instant as the input signal for the envelope tracking modulator.
    Type: Application
    Filed: June 22, 2012
    Publication date: February 28, 2013
    Applicant: NUJIRA LIMITED
    Inventor: Gerard Wimpenny
  • Publication number: 20120319771
    Abstract: A multiport amplifier modulates a reference quadrature phase shift keying (QPSK) signal using an input RF signal to an input hybrid network, generates a plurality of binary phase shift keying (BPSK) signals by demodulating RF signals that are amplified by a plurality of power amplifiers, detects an amplitude error and a phase error of two corresponding amplified RF signals by comparing a QPSK signal that is generated by coupling two RF signals having a phase difference of 90° among the plurality of BPSK signals with a reference QPSK signal, and compensates the detected amplitude error and phase error.
    Type: Application
    Filed: June 13, 2012
    Publication date: December 20, 2012
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Seong Mo MOON, Dong Hwan SHIN, In Bok YOM
  • Patent number: 8274332
    Abstract: A power amplifier using N-way Doherty structure with adaptive bias supply power tracking for extending the efficiency region over the high peak-to-average power ratio of the multiplexing modulated signals such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. In an embodiment, the present invention uses a dual-feed distributed structure to an N-way Doherty amplifier to improve the isolation between at least one main amplifier and at least one peaking amplifier and, and also to improve both gain and efficiency performance at high output back-off power. Hybrid couplers can be used at either or both of the input and output. In at least some implementations, circuit space is also conserved due to the integration of amplification, power splitting and combining.
    Type: Grant
    Filed: October 21, 2009
    Date of Patent: September 25, 2012
    Assignee: Dali Systems Co. Ltd.
    Inventors: Kyoung Joon Cho, Wan Jong Kim, Shawn Patrick Stapleton
  • Publication number: 20120229206
    Abstract: Included is a radio transmission system comprising a plurality of power amplifiers (PAs); a plurality of Volterra Engine (VE) linearizers corresponding to the PAs; a plurality of feedback loops corresponding to the PAs; at least one digital hybrid matrix (DHM) coupled to the VE linearizers; and an analog hybrid matrix (AHM) coupled to the PAs, wherein the feedback loops are connected to the AHM and the VE linearizers but not to the PAs to reduce the number of feedback loops. Also included is a radio system comprising a plurality of PAs; a Volterra DHM (VDHM) coupled to the PAs; a plurality of feedback loops corresponding to the PAs; and an AHM coupled to the PAs, wherein the feedback loops are connected to the AHM but not to the PAs to reduce the number of feedback loops.
    Type: Application
    Filed: May 22, 2012
    Publication date: September 13, 2012
    Applicant: ROCKSTAR BIDCO LP
    Inventors: John-Peter van Zelm, Peter Rashev
  • Patent number: 8254496
    Abstract: A power amplifier (10) comprises: an A/D converter (11) for converting, to a time discrete signal, an envelope signal included in a high-frequency modulated signal and including only an amplitude modulated component of the high-frequency modulated signal; a switching amplifier (12) for amplifying the output signal of the A/D converter (11); a low-pass filter (13) for removing high frequency noise from the output signal of the switching amplifier (12); a plurality of high-frequency power amplifiers (15-1 to 15-n) for receiving the output signal of the low-pass filter (13) as a power supply and for amplifying a carrier signal included in the high-frequency modulated signal; and a power controller (14) for adjusting the average power of the output signal of the power amplifier (10) by controlling the total gains of the plurality of high-frequency power amplifiers (15-1 to 15-n).
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: August 28, 2012
    Assignee: NEC Corporation
    Inventor: Kiyohiko Takahashi
  • Publication number: 20120177143
    Abstract: A signal distributor sequentially outputs N input signals respectively corresponding to N rows of a matrix of which each has N element signals in which a predetermined matrix is obtained by dividing the matrix by a predetermined value. A coupler adds the amplified N element signals for each the input signal. A solver computes feedback signals Y* for the individual amplifiers by using an addition result Y of the outputs for each the input signal and the inverse matrix L?1 of the predetermined matrix.
    Type: Application
    Filed: November 30, 2011
    Publication date: July 12, 2012
    Applicant: FUJITSU LIMITED
    Inventor: Alexander N. LOZHKIN
  • Patent number: 8155348
    Abstract: A post phase-inverter master volume regulator for use in combination with a tube-type musical amplifier having a phase-inverter tube. The signals at both sides of the phase-inverter tube's DC voltage plate are extracted from the amplifier for processing by the master volume regulator. In one embodiment, such signals are extracted by inserting a male/female tube base between the amplifier's phase-inverter tube and its socket. The two voltage plate signals are then transmitted through a multiconductor umbilical to an exterior enclosure. Each signal is connected to ground through its respective user adjustable rheostat, permitting the user to simultaneously change the inverter-tube's two voltage signals (and vary the amplifier's volume). The regulator may also include circuitry adapted to provide a bass-boost, and/or a high frequency cutoff. Sometimes, first and second volume controls may be provided to permit a user to quickly change between two volume settings.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: April 10, 2012
    Inventor: David William Bray
  • Publication number: 20110267141
    Abstract: A multiport amplifier and a wireless device using the same are obtained in which isolation among output terminals is improved, whereby the quality of communication is improved. The multiport amplifier includes an input hybrid, an output hybrid, a plurality of amplifiers and a plurality of gain and phase control circuits that are inserted between the input hybrid and the output hybrid, a plurality of output coupling circuits that are inserted between the output hybrid and a plurality of output terminals so that they receive output extraction signals corresponding to a plurality of output signals, and a feedback circuit including a frequency selection circuit that is inserted between the plurality of output coupling circuits and the plurality of gain and phase control circuits.
    Type: Application
    Filed: October 1, 2009
    Publication date: November 3, 2011
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masatake Hangai, Kazutomi Mori, Kenichi Tajima, Yukihiro Tahara, Morishige Hieda
  • Publication number: 20110254622
    Abstract: A radio frequency amplifier amplifies a modulation signal or its phase modulation signal and outputs the resultant signal. A linear amplifying section adds an output voltage to a power supply voltage supplied to the radio frequency amplifier and negatively feeds back the power supply voltage supplied to the radio frequency amplifier such that the power supply voltage matches the amplitude modulation component of the modulation signal with a predetermined ratio. A control signal generation section detects a direction in which an output current of the linear amplifying section flows and generates a pulse modulation signal according to the direction of the current. A switching amplifying section controls connection and disconnection of a DC current based on the pulse modulation signal as a control signal so as to perform switching amplification for an output signal of the linear amplifying section and supply the resultant signal as the power supply voltage to the radio frequency amplifier.
    Type: Application
    Filed: December 16, 2009
    Publication date: October 20, 2011
    Inventors: Kazuaki Kunihiro, Shingo Yamanouchi, Kiyohiko Takahashi
  • Publication number: 20110241772
    Abstract: An error amplifier may be part of a voltage regulator and may include a single feedback input configured to receive a feedback signal. A single error output may be configured to provide an error output signal indicative of error in the feedback signal. A comparison circuit may be configured to provide an error signal to the single error output which is indicative of a difference between the feedback signal and whichever one of a set of reference signals is closest to the feedback signal. One or more of these reference signals may each be derived from an offset from a ground reference. One or more of the other reference signals may each be derived from an offset from a non-ground reference, such as a source of power for the error amplifier. The error amplifier may be on a single integrated circuit along with an associated driver circuit.
    Type: Application
    Filed: April 1, 2010
    Publication date: October 6, 2011
    Applicant: LINEAR TECHNOLOGY CORPORATION
    Inventors: Mathew Todd Wich, Albert MienYee Wu
  • Patent number: 7952429
    Abstract: The invention relates to an amplifier capable of delivering a plurality of output signals, these output signals being controlled by a plurality of input signals. A multiple-input and multiple-output amplifier of the invention comprises a common input terminal, 4 signal input terminals, 4 signal output terminals, a common terminal amplifier, 4 active sub-circuits and a feedback network. Each active sub-circuit has a sub-circuit input terminal connected to one of the signal input terminals, a sub-circuit output terminal connected to one of the signal output terminals and a sub-circuit common terminal. The feedback network has four C terminals and one R terminal. Each of said C terminals of the feedback network is coupled to the sub-circuit common terminal of one of said active sub-circuits. The output terminal of the common terminal amplifier is coupled to said R terminal of the feedback network.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: May 31, 2011
    Assignee: Excem
    Inventors: Frederic Broyde, Evelyne Clavelier
  • Patent number: 7940119
    Abstract: The invention relates to an amplifier capable of producing a plurality of output signals, these output signals being controlled by a plurality of input signals. A multiple-input and multiple-output amplifier of the invention includes 4 signal input terminals, 4 signal output terminals, 4 active sub-circuits and a feedback network. Each active sub-circuit has a sub-circuit input terminals connected to one of the signal input terminals, a sub-circuit output terminal connected to one of the signal output terminals and a sub-circuit common terminal. The feedback network uses mutual induction between windings. The feedback network has terminals connected to the sub-circuit common terminal of the active sub-circuits. The feedback network presents an impedance matrix producing a negative feedback such that the transfer admittance matrix of the multiple-input and multiple-output amplifier approximates a given admittance matrix.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: May 10, 2011
    Assignee: Excem SAS
    Inventors: Frédéric Broyde, Evelyne Clavelier
  • Patent number: 7847630
    Abstract: There is provided an amplifier for combining outputs of a plurality of amplifying circuits to generate an amplifier output. The amplifier includes a first amplifying circuit for operating a first amplifying device in class-AB, wherein the first amplifying circuit is one among the plurality of the amplifying circuits; a second amplifying circuit for operating a second amplifying device in class-B or class-C, wherein the second amplifying circuit is one among the plurality of the amplifying circuits; and a summing node at which an output of the first amplifying circuit is combined with an output of the second amplifying circuit via a first impedance transformer containing a transmission line of an electrical length other than ?/4. The second amplifying device is connected to the summing node via an output matching circuit and a second impedance transformer containing a transmission line.
    Type: Grant
    Filed: October 24, 2005
    Date of Patent: December 7, 2010
    Assignee: Hitachi Kokusai Electric Inc.
    Inventors: Yoichi Okubo, Masaki Suto, Yasuhiro Takeda, Masaru Adachi
  • Patent number: 7813515
    Abstract: A multi-channel power amplifier for driving a plurality of loads, each associated with a respective channel, each channel comprising a pair of operational amplifiers, first and second, one operational amplifier of each channel being connectable by configuring switches either in a bridge configuration with the other operational amplifier or in single-ended configuration to a constant reference voltage output by a dedicated voltage buffer of the multi-channel amplifier for driving the respective load of the channel, comprises a window comparator for monitoring the level of the input signal of the channel and producing a logic control signal for the configuring switches. Each channel has a dedicated window comparator monitoring the level of the input signal of the channel that generates a logic signal for positioning the switches that configure the output power structure of the channel in single-ended or bridge configuration.
    Type: Grant
    Filed: June 9, 2004
    Date of Patent: October 12, 2010
    Assignee: STMicroelectronics, S.r.l.
    Inventors: Edoardo Botti, Fabio Cagnetti
  • Patent number: 7737778
    Abstract: Systems, methods, and devices relating to the provision of deliberate predistortion to an input signal to compensate for distortions introduced by an amplifier subsystem. An input signal is received by a signal processing system which includes a predistortion subsystem. The input signal is decomposed and the fragments are then predistorted by the predistortion subsystem by applying a deliberate predistortion to the fragments. The predistorted fragments are then separately processed and recombined to arrive at the system output signal. The predistortion subsystem adaptively adjusts based on characteristics of the system output signal. Also, the predistortion subsystem is equipped with a control system that is state based—the state of the predistortion subsystem is dependent upon the prevailing conditions and, when required, the control system switches the state of the predistortion subsystem.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: June 15, 2010
    Inventor: Aryan Saed
  • Publication number: 20100090762
    Abstract: Included is a radio transmission system comprising a plurality of power amplifiers (PAs); a plurality of Volterra Engine (VE) linearizers corresponding to the PAs; a plurality of feedback loops corresponding to the PAs; at least one digital hybrid matrix (DHM) coupled to the VE linearizers; and an analog hybrid matrix (AHM) coupled to the PAs, wherein the feedback loops are connected to the AHM and the VE linearizers but not to the PAs to reduce the number of feedback loops. Also included is a radio system comprising a plurality of PAs; a Volterra DHM (VDHM) coupled to the PAs; a plurality of feedback loops corresponding to the PAs; and an AHM coupled to the PAs, wherein the feedback loops are connected to the AHM but not to the PAs to reduce the number of feedback loops.
    Type: Application
    Filed: October 15, 2008
    Publication date: April 15, 2010
    Applicant: Nortel Networks Limited
    Inventors: John-Peter van Zelm, Peter Rashev
  • Patent number: 7669426
    Abstract: Circuits, methods, and systems are directed to controlling the amount and polarity of current to multiple loads with switches, where the loads share switching components. The loads may be thermoelectric elements, which heat or cool based on the state of the switches. The switches may be run in a single mode during a duty cycle, or multiple successive modes during the duty cycle to achieve full control of the loads.
    Type: Grant
    Filed: May 11, 2006
    Date of Patent: March 2, 2010
    Assignee: Bio-Rad Laboratories, Inc.
    Inventors: Robert Alan Iovanni, Peter Edward Cann, David J. Kelley
  • Patent number: 7642849
    Abstract: The invention relates to an amplifier capable of producing a plurality of currents at its output terminals, these currents being controlled by a plurality of input voltages. A multiple-input and multiple-output amplifier of the invention includes 4 signal input terminals, 4 signal output terminals, 4 active sub-circuits and a feedback network. Each active sub-circuit has a sub-circuit input terminal connected to one of the signal input terminals, a sub-circuit output terminal connected to one of the signal output terminals and a sub-circuit common terminal. The feedback network has terminals connected to the sub-circuit common terminal of each active sub-circuit. The feedback network presents, in a known frequency band, an impedance matrix producing a negative feedback such that the transfer admittance matrix of the multiple-input and multiple-output amplifier approximates a given admittance matrix.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: January 5, 2010
    Assignee: Excem SAS
    Inventors: Frederic Broyde, Evelyne Clavelier
  • Patent number: 7567122
    Abstract: A system for controlling gain in a polar loop is disclosed. Embodiments of the invention provide for a substantially constant gain tolerant of changes in supply voltage, ambient temperature, and/or manufacturing process.
    Type: Grant
    Filed: February 2, 2006
    Date of Patent: July 28, 2009
    Assignee: Skyworks Solutions, Inc.
    Inventor: Tirdad Sowlati
  • Patent number: 7557651
    Abstract: Various systems and methods for signal amplification are disclosed. For example, some embodiments of the present invention provide differential amplifiers that include dual transconductance characteristics. Such amplifiers include two dual input operational amplifiers that each include two input sets. A first of the input sets exhibits a first transconductance and a second of the input sets exhibits a second transconductance. The two dual input operational amplifiers are configured such that to a common mode signal, the amplifier exhibits an overall transconductance that is the difference between the first transconductance and the second transconductance. In contrast, to a differential signal, the overall transconductance is the sum of the first transconductance and the second transconductance.
    Type: Grant
    Filed: February 2, 2007
    Date of Patent: July 7, 2009
    Assignee: Texas Instruments Incorporated
    Inventor: Marco Corsi
  • Patent number: 7512387
    Abstract: A system for controlling a power supplied to a load from a radio frequency amplifier system includes a radio frequency signal generator adapted for generating a radio frequency signal, an amplifier to which the radio frequency signal is supplied and that amplifies the radio frequency signal into a radio frequency power signal, a power coupler connected to the amplifying member for coupling the radio frequency power signals, where the power coupler includes a summing connection adapted for connection to the load and a compensating connection adapted for connection to a dissipative element. A first control value generating member is adapted for receiving a signal proportional to a power output from the power coupler at the summing connection and is adapted for generating a first control signal for controlling the amplifier or a current supply that supplies current to the amplifier.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: March 31, 2009
    Assignee: Huettinger Elektronik GmbH + Co. KG
    Inventor: Michael Glueck