Including Particular Power Supply Circuitry Patents (Class 330/297)
  • Patent number: 8773200
    Abstract: Embodiments for at least one method and apparatus of a voltage supply are disclosed. One voltage supply apparatus includes a voltage supply, a plurality of power amplifier (PA) decoupling circuits, and a plurality of power amplifiers. Each PA decoupling circuit is connected to the voltage supply and provides a filtered voltage supply to a corresponding one of the plurality power amplifiers. Each PA decoupling circuit configured to suppress noise of the provided filtered voltage supply below a threshold at one or more selected frequencies, wherein the suppression is provided by the PA decoupling circuit operating in conjunction with at least one other of the plurality of PA decoupling circuits.
    Type: Grant
    Filed: November 11, 2012
    Date of Patent: July 8, 2014
    Assignee: R2 Semiconductor, Inc.
    Inventors: Cory Severson, Ravi Ramachandran, David Fisher
  • Patent number: 8773201
    Abstract: An amplifying device 1 of the present invention performs distortion compensation on distortion appearing in input-output characteristics of an amplifier 4 based on an input signal and an output signal of the amplifier 4, and includes a predistorter 23 that obtains the input signal and the output signal and performs distortion compensation of the amplifier; an ACLR calculation unit 25 that detects the distortion level of the distortion of the amplifier 4; and an adjustment unit 26 that adjusts the power of the input signal in accordance with the distortion level.
    Type: Grant
    Filed: September 8, 2010
    Date of Patent: July 8, 2014
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takashi Yamamoto, Tadashi Araki
  • Publication number: 20140184334
    Abstract: Optimization methods via various circuital arrangements for amplifier with variable supply power are presented. In one embodiment, a switch can be controlled to include or exclude a feedback network in a feedback path to the amplifier to adjust a response of the amplifier dependent on a region of operation of the amplifier arrangement (e.g. linear region or compression region).
    Type: Application
    Filed: March 14, 2013
    Publication date: July 3, 2014
    Applicant: PEREGRINE SEMICONDUCTOR CORPORATION
    Inventor: PEREGRINE SEMICONDUCTOR CORPORATION
  • Publication number: 20140184335
    Abstract: Various envelope tracking amplifiers are presented that can be switched between an ET (envelope tracking) mode and a non-ET mode. Switches and/or tunable components are utilized in constructing the envelope tracking amplifiers that can be switched between the ET mode and the non-ET mode.
    Type: Application
    Filed: March 14, 2013
    Publication date: July 3, 2014
    Applicant: PEREGRINE SEMICONDUCTOR CORPORATION
    Inventors: Dan William Nobbe, Jeffrey A. Dykstra, Chris Olson, James S. Cable
  • Publication number: 20140184339
    Abstract: Highly power efficient transmitter output stage designs are provided. In an embodiment, the probability density function (PDF) of an input signal is divided into a plurality of regions, and samples of the input signal are processed depending on the region of the PDF within which they fail. The PDF can be divided between an inner region corresponding to samples of the input signal that are within a predetermined amplitude range, and outer regions corresponding to samples of the input signal that are outside of the predetermined amplitude range. Samples of the input signal that fall in the inner region are processed by a class A biased amplifier and samples of the input signal that fall in the outer regions are processed by a class B biased amplifier. Output stage designs according to embodiments can be implemented as power amplifiers or power digital-to-analog converters (DACs).
    Type: Application
    Filed: February 15, 2013
    Publication date: July 3, 2014
    Applicant: Broadcom Corporation
    Inventors: Ramon GOMEZ, Massmo Brandolini, Jiangfeng Wu, Kevin Lee Miller, Hans Eberhart, Tianwei Li
  • Patent number: 8766716
    Abstract: An apparatus of a hybrid power modulator using interleaving switching is provided. The apparatus includes a linear switching unit for generating an output signal by comparing an envelope input signal and a feedback signal, an interleaving signal generator for generating an interleaving switching signal arranged not to supply the signal to input stages of P-type Metal-Oxide-Semiconductor (MOS) Field Effect Transistors (FETs) and N-type MOS FETs of power cells at the same time by comparing the output signal and a reference signal, and a switching amplifying unit for determining a level of the switching signal using the interleaving switching signal. Hence, the hybrid power modulator using the interleaving switching method in the envelope signal of the wide bandwidth maintains high efficiency and high linearity. In addition, the buck converter can use the single inductor by preventing the simultaneous on/off of the power cells.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: July 1, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ji-Seon Paek, Dong-Ki Kim, Hee-Sang Noh, Hyung-Sun Lim, Jun-Seok Yang, Young-Eil Kim
  • Patent number: 8754705
    Abstract: An audio amplifier is powered by a switch mode power supply optimized for audio applications. The power supply includes a rectifier circuit and a discontinuous mode multiphase isolated flyback power circuit and does not require a separate power factor correction stage. The discontinuous mode multiphase isolated flyback power circuit includes multiple isolated flyback converters operating synchronously to each convert a portion of the power and supply a phase-summed direct current voltage to the audio amplifier.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: June 17, 2014
    Assignee: Crestron Electronics Inc.
    Inventor: Robert Buono
  • Patent number: 8749304
    Abstract: The switching arrangement is used for the redundant power supply for a power amplifier, especially a high-frequency power amplifier. The power amplifier in this context provides several output-stage components and several power-supply units. The power-supply units are connected together at their load-end connections and supply the output-stage components jointly with energy. If a power-supply unit fails, at least two output-stage components are actively switched off, so that the power amplifier can continue to operate although with reduced output power.
    Type: Grant
    Filed: December 1, 2010
    Date of Patent: June 10, 2014
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Bernhard Kaehs, Ludwig Moll
  • Patent number: 8750812
    Abstract: A power amplification device is disclosed that includes a power amplification circuit operable to amplify a radio frequency (RF) signal in accordance with an amplification gain, and a voltage regulation circuit operable to generate a regulated voltage. A regulated voltage level of the regulated voltage sets the amplification gain. To help prevent the voltage regulation circuit from saturating, the voltage regulation circuit is configured to reduce a voltage adjustment gain when the regulated voltage level reaches a threshold voltage level. In one embodiment, the threshold voltage level is set to be higher when a band-select signal indicates that the RF signal is being transmitted within a first frequency band, and is set to be lower when the band-select signal indicates that the RF signal is being transmitted within a second frequency band. The spectral performance of the power amplification device thus improves with regard to the second frequency band.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: June 10, 2014
    Assignee: RF Micro Devices, Inc.
    Inventors: Erik Pedersen, Søren Deleuran Laursen, Jean-Christophe Berchtold
  • Patent number: 8750539
    Abstract: Charge pump circuits having circuit components such as transistors which may be damaged by voltage transients greater than the normal operating voltage levels of the charge pump circuit, such as may be experienced during powering down. The circuit components to be protected are connected in parallel with a leakage element arranged to have a leakage current that is small enough during normal operation to allow the charge pump to operate effectively but which is large enough, during development of a voltage transient, to prevent excess voltage levels being achieved. The leakage element may have a significant leakage current at a voltage less than the breakdown voltage of the circuit component. Suitable leakage elements are poly diodes.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: June 10, 2014
    Assignee: Wolfson Microelectronics plc
    Inventors: John Laurence Pennock, John Bruce Bowlerwell
  • Patent number: 8750525
    Abstract: A system is provided to protect a loudspeaker (144) by controlling a level of an applied audio signal. A control signal is generated by applying an input audio signal (115) to the collective operations of a gain control system (100). The gain control system (100) uses the input audio signal (115) in conjunction with at least one parameter to derive an estimated stress associated with the loudspeaker (144). The estimated stress is compared with a protection threshold stress (127). If the protection threshold stress is exceeded, a gain applied by a gain component (134) is selectively adjusted to modify the input audio signal (115). The resulting gain-controlled audio signal (116) is employed to drive the loudspeaker (144).
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: June 10, 2014
    Assignee: Harris Corporation
    Inventors: Donald Martz, Bryce Tennant, Anthony Richard Alan Keane
  • Patent number: 8742843
    Abstract: Various embodiments are directed to apparatuses and methods to reduce average power dissipation in transceiver stages such as power amplifiers and low noise amplifiers (LNAs) that process signals of varying output amplitudes. Power dissipation may be reduced by varying the supply voltage in sympathy with the amplitude of the signal and/or the stage current density which may also be varied in sympathy with the signal amplitude.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: June 3, 2014
    Assignee: Intel Corporation
    Inventors: Nicholas P. Cowley, Isaac Ali, William L. Barber
  • Publication number: 20140132354
    Abstract: Circuits and methods for achieving high linearity, high efficiency power amplifiers, including digital predistortion (DPD) and pulse cancellation in switched-state RF power amplifier systems are described.
    Type: Application
    Filed: March 15, 2013
    Publication date: May 15, 2014
    Applicant: ETA DEVICES, INC.
    Inventors: Mark A. Briffa, Joel L. Dawson, John E. DeRoo, Krenar Komoni, David J. Perreault, Oguzhan Uyar
  • Patent number: 8723605
    Abstract: A dynamic power supply for N amplifiers includes first and second power boost circuits which temporarily boost the positive or negative power supply rail, respectively. A control circuit monitors amplifier output signal levels and provides power boost control signals to the power boost circuits, which temporarily raise the positive supply voltage above the nominal voltage level in tandem with the highest output signal from the N amplifiers and lower the negative supply voltage below the nominal voltage level in tandem with the lowest output signal level from the N amplifiers. The power boost circuits each may be coupled to a reservoir capacitor from which current is drawn to provide the power boost. When inactive, the reservoir capacitors charge up from the respective power supply rails. The dynamic power supply is well suited for audio amplification systems.
    Type: Grant
    Filed: February 3, 2012
    Date of Patent: May 13, 2014
    Assignee: THX Ltd
    Inventors: Owen Jones, Lawrence R. Fincham
  • Publication number: 20140118075
    Abstract: A radio frequency (RF) power amplifier circuit with spur cancellation for GSM/GPRS/EDGE transceivers is disclosed. There is a power amplifier with an RF input, an RF output, and a voltage supply input. Additionally, there is an adjustable DC-DC converter with an input connected to a battery, an output connected to the voltage supply input of the power amplifier with a DC supply voltage signal generated thereby. A spur compensator generates an error control signal responsive to spurs in the DC supply voltage signal. The error control signal is applied to the RF input of the power amplifier.
    Type: Application
    Filed: October 30, 2013
    Publication date: May 1, 2014
    Applicant: RFAXIS, INC.
    Inventor: OLEKSANDR GORBACHOV
  • Patent number: 8710925
    Abstract: A radio frequency (RF) power amplifier system adjusts the supply voltage provided to a power amplifier (PA) adaptively, responsive to the measured or estimated power of the RF output signal of the PA. The RF PA system includes a power amplifier (PA) which receives and amplifies an RF input signal to generate an RF output signal at a level suitable for transmission to an antenna. A PA supply voltage controller generates a supply voltage control signal, which is used to control the supply voltage to the final stage of the PA. The supply voltage control signal is generated responsive to the measured or estimated power of the PA RF output signal, and also may be responsive to a parameter indicative of impedance mismatch experienced at the PA output. By controlling this supply voltage to the RF PA, the efficiency of the PA is improved.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: April 29, 2014
    Assignee: Quantance, Inc.
    Inventors: Serge Francois Drogi, Martin A. Tomasz
  • Patent number: 8704599
    Abstract: A highly power-efficient switching power supply is realized. A switching power supply circuit of the present invention comprises: a pulse generation unit configured to generate a pulse for alternately opening and closing a first and a second switching elements; and a switching unit configured to input a voltage to the pulse generation unit in accordance with the detected power consumption level in the external load, wherein the pulse generation unit is configured so as to reduce the pulse width of the pulse that is generated if the voltage input from the switching unit is higher than a reference voltage, and to increase the pulse width of the pulse that is generated if the voltage input from the switching unit is lower than the reference voltage.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: April 22, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Naoki Umemura
  • Patent number: 8698558
    Abstract: Techniques for efficiently generating a power supply are described. In one design, an apparatus includes an envelope amplifier and a boost converter. The boost converter generates a boosted supply voltage having a higher voltage than a first supply voltage (e.g., a battery voltage). The envelope amplifier generates a second supply voltage based on an envelope signal and the boosted supply voltage (and also possibly the first supply voltage). A power amplifier operates based on the second supply voltage. In another design, an apparatus includes a switcher, an envelope amplifier, and a power amplifier. The switcher receives a first supply voltage and provides a first supply current. The envelope amplifier provides a second supply current based on an envelope signal. The power amplifier receives a total supply current including the first and second supply currents. In one design, the switcher detects the second supply current and adds an offset to generate a larger first supply current than without the offset.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: April 15, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Lennart K Mathe, Thomas Domenick Marra, Todd R Sutton
  • Patent number: 8693676
    Abstract: An apparatus comprising a first line driver, a second line driver, a charge pump, and a control logic circuit coupled to the first line driver and the second line driver and configured to disable the charge pump when both a first control signal associated with the first line driver and a second control signal associated with the second line driver indicate a charge pump disable state. A network component comprising at least one processor configured to implement a method comprising receiving a first control signal and a second control signal, disabling a charge pump when both the first control signal and the second control signal indicate a charge pump disable state, and operating the charge pump to boost a voltage when the first control signal, the second control signal, or both indicate a charge pump active state.
    Type: Grant
    Filed: April 7, 2010
    Date of Patent: April 8, 2014
    Assignee: Futurewei Technologies, Inc.
    Inventors: Ruijie Xiao, Guozhu Long, Zhilei Zhao
  • Patent number: 8692620
    Abstract: A power amplifier including a MOSFET including a source supplied with a first DC power, a gate connected to an RF input signal, and a drain connected to a power supply terminal of an RF power amplification unit; a supply voltage modulation control unit that determines a DC gate voltage of the MOSFET based on an envelope of the RF input signal; and a bypass circuit connected between the drain and the power supply terminal. The MOSFET outputs a second DC power via the drain and amplifies the RF input signal based on a third DC power substantially identical to a differential between the first and the second DC power, and also outputs an RF power via the drain. The bypass circuit receives and rectifies the RF power to supply a recycled DC power to the power supply terminal of the RF power amplification unit.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: April 8, 2014
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Moon Suk Jeon, Jung-Rin Woo, Sang Hwa Jung, Jung Hyun Kim, Young Kwon, Il Do Jung
  • Patent number: 8688033
    Abstract: An antenna transmission control device has a base-station-side and an antenna-side multiplexer circuit. There is an alternating protocol transfer between these two multiplexer circuits to control components close to the antenna. The current-alarmed or protocol-alarmed signals present at the antenna-side terminals of the multiplexer provided on the antenna side can be measured or detected by the multiplexer circuits and supplied to the transmission link together with a terminal-dependent or load-dependent protocol.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: April 1, 2014
    Assignee: Kathrein-Werke KG
    Inventors: Alexander Seeor, Markus Mohr, Roland Gabriel
  • Patent number: 8686792
    Abstract: A supply voltage controller 11 includes a simplified envelope creating unit 111 that calculates an envelope of an input audio signal according to an input audio signal from an external device, creates a supply voltage control signal so that a waveform of the supply voltage control signal follows a waveform of the envelope, and outputs the supply voltage control signal to a voltage variable power supply 12 a constant time before the input audio signal is amplified by the amplifier 14. Accordingly, an amplifying device can be provided which can reduce the distortion of the output signal not depending on a change in the slew rate of the voltage variable power supply 12 and suppress the deterioration of power efficiency.
    Type: Grant
    Filed: January 5, 2011
    Date of Patent: April 1, 2014
    Assignee: Panasonic Corporation
    Inventors: Rintaro Sukegawa, Seigo Ozaki
  • Patent number: 8687826
    Abstract: An amplifier circuit comprises an input, for receiving an input signal to be amplified; a preamplifier, for amplifying the input signal based on a variable gain; a power amplifier for amplifying the signal output from the preamplifier, and a variable voltage power supply for supplying one or more supply voltages to the power amplifier. The supply voltages are adjusted based on the variable gain or the input digital signal. According to other aspects of the invention, a power supply of an amplifier circuit is clocked using a clock signal, whereby the clock signal has a frequency that varies in accordance with a volume signal or an input signal.
    Type: Grant
    Filed: August 4, 2008
    Date of Patent: April 1, 2014
    Assignee: Wolfson Microelectronics plc
    Inventor: John Paul Lesso
  • Publication number: 20140085007
    Abstract: An envelope detector (ED) includes a voltage-mode ED core including parallel detection transistors for detecting a voltage envelope of a radio frequency (RF) signal input, the RF signal input including an output of a radio such as a cellular transmitter (TX). The ED further includes multiple voltage amplifiers positioned serially in gain stages between the TX output and the ED core to provide a total linear voltage range of the envelope detector. A final voltage amplifier of the multiple voltage amplifiers drives the ED core and includes a class-AB RF amplifier configured to operate within a full linear voltage range of the ED core.
    Type: Application
    Filed: September 26, 2012
    Publication date: March 27, 2014
    Applicant: BROADCOM CORPORATION
    Inventors: Amir Hadji-Abdolhamid, Janice Chiu
  • Publication number: 20140085008
    Abstract: A novel and useful radio frequency (RF) front end module (FEM) circuit that provides high linearity and power efficiency and meets the requirements of modern wireless communication standards such as 802.11 WLAN, 3G and 4G cellular standards, Bluetooth, ZigBee, etc. The configuration of the FEM circuit permits the use of common, relatively low cost semiconductor fabrication techniques such as standard CMOS processes. The FEM circuit includes a power amplifier made up of one or more sub-amplifiers having high and low power circuits and whose outputs are combined to yield the total desired power gain. An integrated multi-tap transformer having primary and secondary windings arranged in a novel configuration provide efficient power combining and transfer to the antenna of the power generated by the individual sub-amplifiers.
    Type: Application
    Filed: September 23, 2013
    Publication date: March 27, 2014
    Applicant: DSP Group, Ltd.
    Inventors: Avi Cohen, Michael Gulko
  • Patent number: 8680710
    Abstract: Supply voltage sequencing circuitry includes a first sequencer (10-1) that produces an active level of a Power Good signal PG if a first supply voltage VOUT1 exceeds an upper threshold V90% while a control signal EN_PG is active, and produces an inactive level of PG if EN_PG is inactive. The PG level is latched when a control signal EN is inactive. A Power Down signal PD is produced if VOUT1 is less than a lower threshold V10% while EN is inactive. An active level of PD is produced when EN is active. A power-up sequence of supply voltages VOUT1, VOUT2, and VOUT3 monitored by the first sequencer and similar second (10-2) and third (10-3) sequencers, respectively, is determined by connection of PG of each of the first and second sequencers to control the supply voltage monitored by the next sequencer.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: March 25, 2014
    Assignee: Texas Instruments Incorporated
    Inventor: Masashi Nogawa
  • Patent number: 8680925
    Abstract: An amplifier arrangement comprising an amplifier (AMP) with a terminal (SPL) for a supply signal (VSPL) and a bias circuit (BIAS) for providing the supply signal (VSPL) at the terminal (SPL). The bias circuit holds an operating point (OP) of the amplifier (AMP) constant by means of the supply signal (VSPL). The bias circuit (BIAS) comprises a reference circuit (REF) for providing a reference signal (VREF) and a correction device (COR) by means of which the supply signal (VSPL) is regulated based on the reference signal (VREF) and a correction signal (Vfeed), the correction signal (Vfeed) being dependent on the operating point (OP) of the amplifier (AMP). A method for operating an amplifier arrangement is also described.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: March 25, 2014
    Assignee: AMS AG
    Inventor: Thomas Christen
  • Publication number: 20140077884
    Abstract: Some embodiments provide an amplifier apparatus, comprising: a plurality of amplifier transistor circuits coupled in series, wherein each of the plurality of amplifier transistor circuits comprises: a transistor, wherein the transistors of the plurality of amplifier transistor circuits are coupled in series; a transistor voltage control and drive circuit coupled with the corresponding transistor, wherein the transistor voltage control and drive circuit is configured to control and drive the corresponding transistor in accordance with received control signals and in parallel with the other of the plurality of amplifier transistor circuits; and isolation circuitry that isolates control of the transistor from control of the other of the amplifier transistor circuits; wherein the plurality of amplifier transistor circuits are configured to be controlled and driven in parallel relative to the control signals.
    Type: Application
    Filed: September 14, 2012
    Publication date: March 20, 2014
    Applicant: GENERAL ATOMICS
    Inventors: Paul Huynh, Joseph F. Tooker
  • Publication number: 20140079096
    Abstract: To improve upon efficiency of a transmitter's power amplifier during low power operation, a switching system is used to selectively switch between different (e.g., normal and reduced) power supplies. Suitable hardware/software in the form of circuitry, logic gates, and/or code functions to process, amplify, and transmit an input RF signal and selectively switch IN/OUT a plurality of supply voltages using control logic.
    Type: Application
    Filed: September 14, 2012
    Publication date: March 20, 2014
    Applicant: BROADCOM CORPORATION
    Inventors: Ali Afsahi, Arya Reza Behzad, Ali Karimi-Sanjaani, Dandan Li, Kyujin Oh, Prasad Sitaram
  • Publication number: 20140077885
    Abstract: A power converter with positive and negative supply rail outputs for feeding a single ended class D amplifier, the converter comprising a transformer arrangement, a supply pump reduction arrangement connected between the secondary windings and the positive and negative supply rail outputs, and a boost drive mode switching arrangement. A controller is adapted to control the power converter in a negate drive mode and a boost drive mode, wherein the output voltage in the boost mode is increased by means of the transformer and the boost drive mode switching arrangement. The output voltages on the positive and negative rails can be generated at two different output voltage levels without changing the duty cycle or dead time of the control signals.
    Type: Application
    Filed: June 14, 2012
    Publication date: March 20, 2014
    Applicant: BANK & OLUFSEN ICEPOWER A/S
    Inventor: Mads Peter Frium
  • Patent number: 8669811
    Abstract: A radio-frequency power amplifier with envelope tracking, comprising: a power RF amplifying device for amplifying a RF signal; and a switching DC/DC converter, comprising a switching device and a rectifying device, for providing said power RF amplifying device with a DC power supply at a voltage level proportional to an envelope of said RF signal; wherein said switching device is a RF power transistor; characterized in that said rectifying device, and preferably also said power RF amplifying device, is also a transistor of a same technology, connected as a two-terminal device. Preferably, said power RF amplifying device is also a transistor of said same technology. A low-pass filter can also be provided for reducing the bandwidth of the envelope signal on which the PWM signal driving the DC/DC converter depends.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: March 11, 2014
    Assignee: Agence Spatiale Europeenne
    Inventors: Nicolas Le Gallou, Christophe Delepaut, David Sardin, Michel Campovecchio
  • Patent number: 8665018
    Abstract: An integrated circuit for providing a differential interface for an envelope tracking signal is described. The integrated circuit includes a subtraction module having a first input for receiving a digital envelope tracking signal and a second input for receiving a second signal, wherein the subtraction module is arranged to subtract the second signal from the digital envelope tracking signal and produce an envelope tracking signal with a reduced average direct current (DC) component; a digital-to-analog converter (DAC) arranged to receive the envelope tracking signal with the reduced average DC component and produce a differential analog version thereof; and a modulator operably coupled to a differential output of the DAC, wherein the modulator comprises a DC input point arranged to insert a DC component into the differential analog version of the envelope tracking signal.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: March 4, 2014
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Jonathan Richard Strange, Paul Fowers
  • Patent number: 8665021
    Abstract: Apparatus and methods for amplifier power supply control are provided. In certain implementations, an amplifier includes an input amplification stage and a power supply control block for generating a power high supply and a power low supply for the input amplification stage. The power supply control block receives a reference signal indicative of a common-mode input voltage of the amplifier, and the power supply control block adjusts a voltage level of the power high and power low supplies while maintaining a substantially constant voltage difference between the power high and power low supplies. The power supply control block changes the voltage level of the power high and power low supplies based on the reference signal such that the voltage levels of the power high and power low supplies move in relation to the common-mode input voltage.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: March 4, 2014
    Assignee: Analog Devices, Inc.
    Inventor: Mark Reisiger
  • Patent number: 8659356
    Abstract: Embodiments of the present invention a power supply circuit of a power amplifier and a terminal, relating to the communication field. The power supply circuit of the power amplifier includes a direct current/direct current converter chip, where the direct current/direct current converter chip includes an input pin, an inductance pin, and a feedback pin, and the input pin is connected to a power supply and the inductance pin is connected to a voltage input end of the power amplifier through an LC storage circuit. A control circuit is connected between the voltage input end of the power amplifier and the feedback pin; the control circuit includes a control voltage, where the control voltage adjusts the voltage at the voltage input end of the power amplifier through the control circuit and the control voltage is variable.
    Type: Grant
    Filed: January 17, 2012
    Date of Patent: February 25, 2014
    Assignee: Huawei Device Co., Ltd.
    Inventor: Zexu Qian
  • Patent number: 8653891
    Abstract: Embodiments of power amplification devices are described that include a power amplification circuit, a first voltage regulation circuit, and a second voltage regulation circuit. The voltage regulation circuits are configured to provide regulated voltages to the power amplification circuit. The power amplification device also includes a threshold detection circuit to get better maximum output power performance while preserving power efficiency. The threshold detection circuit is configured to increase a voltage adjustment gain of the first voltage regulation circuit when a regulated voltage level of regulated voltage from the second voltage regulation circuit reaches a threshold voltage level. In this manner, the voltage adjustment gain can be increased when the second voltage regulation circuit is close to or has railed.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: February 18, 2014
    Assignee: RF Micro Devices, Inc.
    Inventors: Lars Sandahl Ubbesen, Erik Pedersen, Søren Deleuran Laursen
  • Patent number: 8653886
    Abstract: The invention is based on the fact that the current output from a DDB controlled amplifier in backoff, i.e. for low amplitudes, is reduced more or less linearly with the amplitude of the signal to be amplified. Therefore, it is enough to use smaller amplifiers which are able to output the necessary RF current. Hence, according to the present invention, the total DDB amplifier is divided into smaller parts that are coupled to the output only when needed.
    Type: Grant
    Filed: September 15, 2009
    Date of Patent: February 18, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Richard Hellberg
  • Patent number: 8643435
    Abstract: An apparatus and a method for expanding an operation region in an envelope tracking power amplifier are provided. The apparatus for amplifying power of a transmission signal includes an amplitude component determination unit, a supply modulator, and a power amplify module. The amplitude component determination unit determines an amplitude component of a transmission signal. The supply modulator generates a supply voltage to be provided to the power amplify module depending on the amplitude component of the transmission signal determined by the amplitude component determination unit. The power amplify module amplifies power of the transmission signal depending on the supply voltage generated by the supply modulator.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: February 4, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyung-Sun Lim, Hee-Sang Noh, Young-Eil Kim, Bok-Ju Park, Sang-Hyun Baek, Ji-Seon Paek, Jun-Seok Yang
  • Patent number: 8638170
    Abstract: A headphone driver amplifier operative from a single DC voltage supply, coupled directly to the headphone speakers without the need for DC coupling capacitors used for preventing DC reaching the headphones. An onboard power supply generates a negative voltage rail which powers the output amplifiers, allowing driver amplifier operation from both positive and negative rails. Since the amplifiers can be biased at ground potential (0 volts), no significant DC voltage exists across the speaker load and the need for DC coupling capacitors is eliminated.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: January 28, 2014
    Assignee: Maxim Integrated Products, Inc.
    Inventor: Tony Doy
  • Patent number: 8633766
    Abstract: Embodiments disclosed in the detailed description relate to a pseudo-envelope follower power management system including a parallel amplifier and a switch mode power supply converter cooperatively coupled to generate a power supply voltage at a power supply output coupled to a linear RF power amplifier. The parallel amplifier output is in communication with the power amplifier supply output. The parallel amplifier governs operation of the switch mode power supply converter and regulates the power amplifier supply voltage base on a VRAMP signal. The parallel amplifier circuit includes an open loop high frequency compensation assist circuit that generates a high frequency ripple compensation current based on an estimate of the high frequency ripple currents contained in a ripple current of the power inductor. The high frequency ripple compensation current is injected into the parallel amplifier circuit output to cancel out high frequency ripple currents at the power amplifier supply output.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: January 21, 2014
    Assignee: RF Micro Devices, Inc.
    Inventors: Nadim Khlat, Michael R. Kay, Philippe Gorisse
  • Patent number: 8633768
    Abstract: To provide an envelope tracking type amplifier that has high efficiency and small fluctuations, an output unit supplies an output signal that is adjusted corresponding to an input signal to a power supply terminal of the amplifier. The output unit includes an analog amplifying circuit that amplifies the input signal; a digital circuit that selectively outputs a first voltage or a second voltage that is lower than the first voltage; and first and second output circuits. The first output circuit includes a first integrating circuit that integrates an output signal of the digital circuit; and a combining section that combines an output signal of the first integrating circuit and an output signal of the analog amplifying circuit and outputs the combined signal to a power supply terminal of the amplifier.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: January 21, 2014
    Assignee: NEC Corporation
    Inventor: Yuji Takahashi
  • Patent number: 8633772
    Abstract: A power conversion circuit includes a pulse width modulator, a feedback module, a negative voltage producing module, a voltage regulating module, a path switch, and a rectifier module. The path switch is connected to a power port connected to a power source. The feedback module produces a feedback signal according to the voltage of a positive voltage input port of a power amplifier. The pulse width modulator receives the feedback signal, and outputs a pulse signal with a corresponding duty cycle according to the feedback signal to the path switch, then producing a switching power supply signal; the rectifier module converts the switching power supply signal to a direct current signal with a suitable positive voltage. The negative voltage producing module produces corresponding negative voltage when the path switch is turned on or off. The voltage regulating module regulates the negative voltage to a suitable negative voltage.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: January 21, 2014
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd, Hon Hai Precision Industry Co., Ltd.
    Inventor: Xing-Hua Tang
  • Patent number: 8605915
    Abstract: The present technology is directed to class G audio amplifiers and the associated methods of operation. In one embodiment, a class G audio amplifier includes an input port, an audio output stage, a level detector, and a charge pump. The class G audio amplifier regulates the power supplies of the audio output stage according to the input signal, so as to realize high efficiency and high quality audio output.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: December 10, 2013
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Haishi Wang, Zhengwei Zhang, Rui Wang, Jinyan Lin
  • Publication number: 20130322197
    Abstract: A method includes forming a power control circuit through coupling a gate switch array between a buffer stage at an input of the power control circuit and an amplifier array including N amplifier stages in parallel to each other, with N>1. The method also includes coupling each of the N amplifier stages to a corresponding gate switch of the gate switch array, and controlling an output power of the power control circuit by switching one or more appropriate gate switches of the gate switch array to apply an input signal from the buffer stage to a corresponding one or more amplifier stages coupled to the one or more appropriate gate switches such that a maximum output power is achieved when all of the N amplifier stages are turned on and a minimum output power is achieved when only one amplifier stage is turned on.
    Type: Application
    Filed: May 30, 2012
    Publication date: December 5, 2013
    Inventors: Christopher T. Schiller, Michael Joseph Shaw
  • Patent number: 8598950
    Abstract: Apparatus and methods for capacitive load reduction are disclosed. In one embodiment, a power amplifier system includes a plurality of power amplifiers and an envelope tracking module for generating a supply voltage for the power amplifiers. The power amplifier system further includes a switch and a decoupling capacitor operatively associated with a first power amplifier of the system. The switch is configured to electrically float an end of the decoupling capacitor when the first power amplifier is disabled so as to reduce capacitive loading of the envelope tracker and to operate as a dampening resistor when the power amplifier is enabled so as to improve the stability of the system.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: December 3, 2013
    Assignee: Skyworks Solutions, Inc.
    Inventor: Sabah Khesbak
  • Patent number: 8598952
    Abstract: The present invention relates to a voltage variable type digital audio amplifying device for noise compensation and a method therefor, and more specifically, varies the power according to an audio input signal, and compensates for the noise generated when varying the power, thereby enhancing audio output efficiency and easily removing noise.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: December 3, 2013
    Assignee: Pulsus Technology Inc.
    Inventors: Jong Hoon Oh, Il Suk Ko
  • Patent number: 8587379
    Abstract: A power amplifier circuit comprising a transistor for receiving a signal to be amplified at an input and for outputting an amplified signal at an output; a modulated power supply connected to the transistor output; and a resistive element connected at the transistor output such that a low impedance is maintained at the transistor output across a range of operational frequencies.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: November 19, 2013
    Assignee: Nujira Limited
    Inventor: Martin Paul Wilson
  • Patent number: 8588713
    Abstract: A power management system for a multi-carriers transmitter is disclosed. The power management system includes a first switcher having a control input and a power output, and a second switcher having a control input and a power output. Also included is a mode switch having a mode control input, wherein the mode switch is adapted to selectively couple the power output of the first switcher to the power output of the second switcher in response to a mode control signal received by the mode control input. Further included is a control system adapted to generate the mode control signal. The control system is coupled to the mode control input of the mode switch.
    Type: Grant
    Filed: January 5, 2012
    Date of Patent: November 19, 2013
    Assignee: RF Micro Devices, Inc.
    Inventor: Nadim Khlat
  • Patent number: 8587380
    Abstract: A system for preventing power amplifier supply voltage saturation includes a multiple stage voltage regulator configured to provide a regulated voltage, a power amplifier configured to receive the regulated voltage, and a saturation protection circuit configured to apply a current into a first stage of the multiple stage voltage regulator when the regulated voltage reaches a reference voltage, the applied current causing a subsequent stage of the multiple stage voltage regulator to prevent the regulated voltage from exceeding the reference voltage.
    Type: Grant
    Filed: July 24, 2012
    Date of Patent: November 19, 2013
    Assignee: Skyworks Solutions, Inc.
    Inventor: Lige Wang
  • Patent number: 8576011
    Abstract: An amplifier with high power supply rejection is disclosed. In an exemplary implementation, an amplifier includes a first stage configured to receive a signal to be amplified, a second stage comprising an input transistor coupled to the first stage, and further comprising at least one additional transistor, and a voltage regulator configured to received a first supply voltage and generate a regulated supply voltage, the first supply voltage coupled to the at least one additional transistor, the regulated supply voltage coupled to the first stage and the input transistor of the second stage to improve power supply noise rejection of the apparatus.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: November 5, 2013
    Assignee: QUALCOMM Incorporated
    Inventor: Vijayakumar Dhanasekaran
  • Publication number: 20130285751
    Abstract: A variable supply rail generator is described. The variable supply rail generator includes a regulator configured to use an estimated load current for a power amplifier to optimize efficiency. The variable supply rail generator also includes a power amplifier controller. The power amplifier controller provides the estimated load current to the regulator.
    Type: Application
    Filed: September 12, 2012
    Publication date: October 31, 2013
    Applicant: QUALCOMM INCORPORATED
    Inventor: Vijayakumar Dhanasekaran