Including Particular Power Supply Circuitry Patents (Class 330/297)
  • Patent number: 9172336
    Abstract: Circuits and methods for performing multilevel power amplification using multiple different supply voltages or states are disclosed. In some embodiments, power amplifiers are provided that switch between three or more supply voltages or states.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: October 27, 2015
    Assignee: Ela Devices, Inc.
    Inventors: Mark A. Briffa, Joel L. Dawson, John E. DeRoo, Krenar Komoni, David J. Perreault, Oguzhan Uyar
  • Patent number: 9154095
    Abstract: A method and an amplifier for amplifying audio signals receive and process an incoming audio sample in preparation for amplification by an electronic amplifier circuit. A boost supply circuit receives a voltage from a power supply. A processor system determines whether amplification of the incoming audio sample warrants more voltage than the voltage received from the power supply. Before completing the processing of the incoming audio sample, the processor system sends a signal to the boost supply circuit to boost the voltage received from the power supply and to supply the boosted voltage to the electronic amplifier circuit if the incoming audio sample warrants more voltage than the voltage received from the power supply. Otherwise, the boost supply circuit passes the voltage received from the power supply to the electronic amplifier circuit.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: October 6, 2015
    Assignee: Bose Corporation
    Inventors: Jay Solomon, Valerie M. Mollo, Elena Acosta Antonellis, Shiufun Cheung
  • Patent number: 9136795
    Abstract: A voltage converter can be switched among two or more modes to produce an output voltage tracking a reference voltage that can be of an intermediate level between discrete levels corresponding to the modes. One or more voltages generated from a power supply voltage, such as a battery voltage, can be compared with the reference voltage to determine whether to adjust the mode. The reference voltage can be independent of the power supply voltage.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: September 15, 2015
    Assignee: Skyworks Solutions, Inc.
    Inventors: Hui Liu, David Steven Ripley
  • Patent number: 9136805
    Abstract: A multi-level amplifier including a converter circuit being supplied with a supply voltage and operable to generate at least two output voltages, a voltage comparator circuit adapted to compare each of the output voltages with the supply voltage to generate a driving signal, and an amplifier circuit being supplied with an analog input signal, the amplifier circuit including an analog-to-digital converter coupled to a power stage driver and power stage, wherein the power stage driver receives the driving signal from the voltage comparator.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: September 15, 2015
    Assignee: ANALOG DEVICES GLOBAL
    Inventors: Dan Li, Hui Shen, Yang Pan
  • Patent number: 9118277
    Abstract: Apparatus and methods for envelope tracking are disclosed. In one embodiment, a power amplifier system including a power amplifier and an envelope tracker is provided. The power amplifier is configured to amplify a radio frequency (RF) signal, and the envelope tracker is configured to control a supply voltage of the power amplifier using an envelope of the RF signal. The envelope tracker includes a buck converter for generating a buck voltage from a battery voltage and a digital-to-analog conversion (DAC) module for adjusting the buck voltage based on the envelope of the RF signal to generate the supply voltage for the power amplifier.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: August 25, 2015
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventors: Florinel G. Balteanu, Sabah Khesbak, Yevgeniy A. Tkachenko, David Steven Ripley, Robert John Thompson
  • Patent number: 9106183
    Abstract: A voltage converter can be switched among two or more modes to produce an output voltage tracking a reference voltage that can be of an intermediate level between discrete levels corresponding to the modes. One or more voltages generated from a power supply voltage, such as a battery voltage, can be compared with the reference voltage to determine whether to adjust the mode. The reference voltage can be independent of the power supply voltage.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: August 11, 2015
    Assignee: Skyworks Solutions, Inc.
    Inventors: Hui Liu, David Steven Ripley
  • Patent number: 9099976
    Abstract: Apparatus and methods are disclosed, such as those involving a receiver device. One such apparatus includes an equalizer configured to process an input signal transmitted over a channel. The equalizer can include a programmable gain amplifier (PGA) block which includes an input node configured to receive the input signal; an output node; and a programmable gain amplifier (PGA). The PGA amplifies the input signal with an adjustable gain. The PGA block also includes a gain control block having an input electrically coupled to the input node. The gain control block is configured to adjust the gain of the PGA at least partly in response to the input signal from the input node such that the PGA generates an output signal with a substantially constant amplitude envelope to the output node.
    Type: Grant
    Filed: October 7, 2013
    Date of Patent: August 4, 2015
    Assignee: Analog Devices, Inc.
    Inventors: Pablo Acosta-Serafini, Kimo Tam, Stuart McCracken, Daniel Mulcahy
  • Patent number: 9088249
    Abstract: Apparatus and methods for reducing capacitive loading of an envelope tracker are disclosed. In one embodiment, a wireless device comprises an envelope tracker including an output configured to generate a power amplifier supply voltage, a plurality of power amplifiers, and a power supply network configured to provide the power amplifier supply voltage to the plurality of power amplifiers. The power amplifier supply network includes a first inductor electrically connected between a supply input of a first power amplifier and the output of the envelope tracker, and a second inductor electrically connected between a supply input of a second power amplifier and the output of the envelope tracker. The first inductor resonates with a distributed capacitance of the power supply network at a frequency greater than the envelope tracker's modulation bandwidth of, and the second inductor resonates with the distributed capacitance at a frequency greater than the envelope tracker's modulation bandwidth.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: July 21, 2015
    Assignee: Skyworks Solutions, Inc.
    Inventors: Daniel Lee Kaczman, James Phillip Young
  • Patent number: 9065385
    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: Grant
    Filed: October 30, 2013
    Date of Patent: June 23, 2015
    Assignee: RFAXIS, INC.
    Inventor: Oleksandr Gorbachov
  • Patent number: 9054658
    Abstract: An apparatus for driving speakers includes user-configurable amplifier cells for driving selected speakers, a synchronous rectifier circuit, and a control system. Each cell connects between power rails. The rectifier circuit provides current on the rails for consumption by the cells. The current depends on the configuration. The control system implements a model of the rectifier circuit and cells and uses it to control an audio input signal in response to information concerning electrical outputs of the amplifier cells. This indirectly limits current drawn from the synchronous rectifier circuit.
    Type: Grant
    Filed: May 13, 2011
    Date of Patent: June 9, 2015
    Assignee: Bose Corporation
    Inventors: Michael Nussbaum, Zoran Coric, Christopher J. Perkins, Timothy W. Sheen
  • Publication number: 20150145606
    Abstract: A power amplifier may include a first amplifying unit receiving a first bias signal to amplify a power level of an input signal; an envelope detecting unit detecting an envelope of the input signal; a comparing circuit unit comparing a peak value of the detected envelope with a preset reference voltage; and a second amplifying unit amplifying the power level of the input signal according to a second bias signal set depending on a comparison result of the comparing circuit unit.
    Type: Application
    Filed: May 8, 2014
    Publication date: May 28, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Kwang Du LEE, Jeong Hoon KIM, Ho Kwon YOON, Joong Jin NAM, Kyu Jin CHOI, Suk Chan KANG, Jae Hyouck CHOI, Kyung Hee HONG
  • Publication number: 20150145605
    Abstract: Peak information about an envelope of a high frequency signal extracted from an output of a high frequency power amplifier (101) and information about a power supply voltage applied to the high frequency power amplifier (101) are detected. In order to suppress HCI degradation based on an additional value that is calculated by addition of the information a controller (10) controls a power supply voltage regulation circuit (125) and a current regulation circuit (126), thereby automatically regulating a power supply voltage and an operating current for the high frequency power amplifier (101). Even when an output voltage exceeds the power supply voltage, a maximum value of a voltage applied to a transistor can be identified, so that HCI degradation can be suppressed.
    Type: Application
    Filed: January 23, 2013
    Publication date: May 28, 2015
    Inventor: Noriaki Saito
  • Patent number: 9041462
    Abstract: An electronic circuit, including, a power amplifier adapted to amplify an RF signal and provide it as output from the integrated circuit; a power source that is adapted to provide an unregulated voltage to the power amplifier; a regulator adapted to provide a regulated bias voltage; a subtracter that is adapted to accept a voltage proportional to the unregulated voltage and subtract it from the bias voltage to provide a reference voltage to the power amplifier; wherein the power amplifier is adapted to use the reference voltage to adjust the output from the power amplifier so that it will provide a stable power output.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: May 26, 2015
    Assignee: DSP GROUP LTD.
    Inventor: Svetlana Kantor
  • Patent number: 9041479
    Abstract: Systems and methods are provided for generating an amplitude modulation signal to a switchmode power amplifier. A DC to DC switch is configured to receive a DC input voltage and to provide a DC output voltage. A low dropout regulator is configured to provide the amplitude modulation signal according to a modulation control signal received by the low dropout regulator. A control circuit is configured to establish a nominal operating power level for the power amplifier via the amplitude modulation signal and to maintain a minimum voltage difference between the DC output voltage and the low dropout regulator output. A modulator control circuit is configured to provide the modulation control signal to the low dropout regulator. The modulator control circuit provides the transition from a high amplitude to a low amplitude and a transition from the low amplitude to the high amplitude at configurable first and second slopes, respectively.
    Type: Grant
    Filed: December 6, 2010
    Date of Patent: May 26, 2015
    Assignee: STRYKER COMBO, L.L.C.
    Inventors: Regis J. Nero, Jr., Jeffrey A. Gibala
  • Patent number: 9041468
    Abstract: A method of operating a switched-mode power supply (SMPS) for supplying power to a load circuit, which draws a supply current that varies with an input signal to the load circuit is disclosed. The method comprises monitoring the input signal and controlling the amount of accumulated energy transferred for consumption by the load circuit, in use, in accordance with the input signal.
    Type: Grant
    Filed: March 20, 2013
    Date of Patent: May 26, 2015
    Assignee: NXP B.V.
    Inventors: Benno Krabbenborg, Marco Berkhout, Johan Somberg, Peter Van De Haar
  • Patent number: 9041464
    Abstract: Circuitry for reducing power consumption is described. The circuitry includes a power amplifier. The circuitry also includes a predistorter coupled to the power amplifier. The circuitry further includes a power supply coupled to the power amplifier. The circuitry additionally includes a controller coupled to the power amplifier, to the predistorter and to the power supply. The controller captures a transmit signal and a feedback signal concurrently and determines a minimum bias voltage from a set of voltages and a predistortion that enable the power amplifier to produce an amplified transmit signal in accordance with a requirement.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: May 26, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Christos Komninakis, Vijay K. Chellappa, Jifeng Geng
  • Publication number: 20150137892
    Abstract: A polarity-switching amplifier circuit includes: a first amplifying transistor and a second amplifying transistor, a transformer which includes a primary winding and a secondary winding, and a polarity-switching controller. An unbalanced input signal is input to the first amplifying transistor and the second amplifying transistor. The transformer receives an output signal of the first amplifying transistor and an output signal of the second amplifying transistor as a balanced signal input to the primary winding, and outputs a signal from the secondary winding. The polarity-switching controller turns on one of the first amplifying transistor and the second amplifying transistor and turns off the other thereof.
    Type: Application
    Filed: March 20, 2014
    Publication date: May 21, 2015
    Applicant: Panasonic Intellectual Property Management Co., Lt d.
    Inventors: Isao Imazeki, Masaki Kanemaru
  • Publication number: 20150137893
    Abstract: A power supply stage and a method of controlling the same comprising: a means for generating an intermediate supply signal in dependence on a reference signal representing a desired power supply; and a plurality of adjusting means, each adapted to generate an adjusted supply signal tracking the reference signal, in dependence on the generated intermediate supply signal and the reference signal.
    Type: Application
    Filed: January 29, 2015
    Publication date: May 21, 2015
    Inventor: Gerard Wimpenny
  • Patent number: 9035699
    Abstract: Exemplary embodiments are directed to operating a multi-stage amplifier with low-voltage supply voltages. A multi-stage amplifier may include a first path of an amplifier output stage configured to convey an output signal if a first supply voltage is greater than a threshold voltage. The multi-stage amplifier may also include a second path of the amplifier output stage configured to convey the output signal if the first supply voltage is less than or equal to the threshold voltage.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: May 19, 2015
    Assignee: QUALCOMM Incorporated
    Inventor: Vijayakumar Dhanasekaran
  • Patent number: 9030261
    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: Grant
    Filed: June 14, 2012
    Date of Patent: May 12, 2015
    Assignee: Bang & Olufsen Icepower A/S
    Inventor: Mads Peter Frium
  • Publication number: 20150123733
    Abstract: An amplification stage comprising: an input scaling block for scaling an input signal in dependence on an input scaling factor to generate a scaled version of the input signal; a power amplifier for generating an amplified version of the scaled input signal; an envelope detector for generating a signal representing the envelope of the input signal; an envelope scaling block for scaling the envelope signal in dependence on an envelope scaling factor to generate a scaled version of the envelope signal; a non-linear mapping block for generating a voltage representative of the supply voltage in dependence on the scaled envelope signal; a modulator for generating a power supply voltage for the amplifier in dependence on the voltage generated by the non-linear mapping block; and a power control block for maintaining a linear relationship between the envelope scaling factor and the input scaling factor.
    Type: Application
    Filed: January 8, 2015
    Publication date: May 7, 2015
    Inventors: Gerard Wimpenny, Robert Henshaw
  • Publication number: 20150123735
    Abstract: An envelope tracking power amplifier system comprising an RF input path and an envelope path for providing a modulated power amplifier supply, further comprising a plurality of envelope detectors for detecting the envelope of a plurality of frequency bands of an input signal and each generating an output signal, and a combiner for combining the output of the envelope detectors.
    Type: Application
    Filed: October 21, 2014
    Publication date: May 7, 2015
    Inventor: Gerard Wimpenny
  • Patent number: 9013239
    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 2, 2014
    Date of Patent: April 21, 2015
    Assignee: Crestron Electronics Inc.
    Inventor: Robert Buono
  • Patent number: 9008332
    Abstract: A processing chip for a digital microphone and related input circuit and a digital microphone are described herein. In one aspect, the input circuit for a processing chip of a digital microphone includes: a PMOS transistor, a resistor, a current source, and a low-pass filter. The described processing chip possesses high anti high-frequency interference capabilities and the described input circuit possesses high high-frequency power supply rejection ratio.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: April 14, 2015
    Assignee: Beijing KT Micro, Ltd.
    Inventors: Wenjing Wang, Jianting Wang, Rongrong Bai, Jing Cao
  • Publication number: 20150097625
    Abstract: Methods and apparatus, including computer program products, are provided for hybrid DC-DC converters. In one aspect, there is provided a method. The method may include tracking, by an envelope detector, an envelope of a signal being amplified by an amplifier. The method may further include supplying, by a first direct-current to direct-current converter, power to the amplifier, the power supplied by the first direct-current to direct-current converter including one or more high-frequency components of the envelope tracked by the envelope detector. The method may further include supplying, by a second direct-current to direct-current converter, power to the amplifier, the power supplied by the second direct-current to direct-current converter including one or more low-frequency components of the envelope tracked by the envelope detector. Related systems, apparatuses, and computer program products are also disclosed.
    Type: Application
    Filed: October 7, 2013
    Publication date: April 9, 2015
    Applicant: Nokia Corporation
    Inventor: Faizan UL HAQ
  • Patent number: 9000843
    Abstract: Various embodiments are directed to apparatuses and methods to generate a first signal representing modulation data and a second signal representing an amplitude of the modulation data, the first signal and the second signal to depend on an output signal and vary a power supply voltage to a gain stage in proportion to the amplitude of the modulation data.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: April 7, 2015
    Assignee: Intel Corporation
    Inventors: Nicholas P. Cowley, Isaac Ali, William L. Barber
  • Publication number: 20150091655
    Abstract: A method and apparatus is provided to improve upon the efficiency of a power amplifier. Suitable hardware/software in the form of circuitry, logic gates, and/or code functions to construct an envelope tracking waveform of an input communications signal and modulate the input supply voltage based on power amplifier circuitry operational parameters such as slew rates.
    Type: Application
    Filed: October 22, 2013
    Publication date: April 2, 2015
    Inventors: Dmitriy Rozenblit, Vipin Kumar Aggarwal
  • Publication number: 20150084701
    Abstract: An integrated power supply and modulator system includes integrated power supply and modulator system includes three subsystems: a switched-capacitor voltage balancer stage; a magnetic regulation stage; and at least one output switching stage. In one embodiment, the integrated power supply and modulator system further includes startup circuitry, feedback/feedforward circuitry and control circuitry.
    Type: Application
    Filed: September 24, 2013
    Publication date: March 26, 2015
    Applicant: Eta Devices, Inc.
    Inventors: David J. Perreault, Wei Li, Yevgeniy A. Tkachenko
  • Patent number: 8988149
    Abstract: An amplifier circuit, comprising: an input, for receiving an input signal to be amplified; a power amplifier, for amplifying the input signal; a switched power supply, having a switching frequency, for providing at least one supply voltage to the power amplifier; and a dither block, for dithering the switching frequency of the switched power supply. The dither block is controlled based on the input signal. Another aspect of the invention involves using first and second switches, each having different capacitances and resistances, and using the first or second switch depending on the input signal or volume signal. Another aspect of the invention involves controlling a bias signal provided to one or more components in the signal path based on the input signal or volume signal.
    Type: Grant
    Filed: July 15, 2013
    Date of Patent: March 24, 2015
    Assignee: Cirrus Logic International (UK) Limited
    Inventor: John Paul Lesso
  • Patent number: 8981847
    Abstract: Apparatus and methods for envelope tracking are disclosed herein. In certain implementations, an envelope tracking system for generating a power amplifier supply voltage for a power amplifier is provided. The envelope tracking system can include a buck converter and an error amplifier configured to operate in parallel to control the voltage level of the power amplifier supply voltage based on an envelope of an RF signal amplified by the power amplifier. The buck converter can convert a battery voltage into a buck voltage that is based on an error current, and the error amplifier can generate the power amplifier supply voltage by adjusting the magnitude of the buck voltage using an output current that is based on the RF input signal's envelope. The error amplifier can control the buck converter by changing a magnitude of the error current in relation to a magnitude of the output current.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: March 17, 2015
    Assignee: Skyworks Solutions, Inc.
    Inventor: Florinel G Balteanu
  • Patent number: 8981851
    Abstract: A power amplifier amplifies a radio signal. Negative feedback is applied to a linear amplifier and the linear amplifier receives an envelope signal. A pulse current modulator is connected to a power supply terminal of a power amplifier and an output terminal of the linear amplifier via an inductor, and outputs a pulse current according to a control signal generated from the envelope signal. A diode has an anode connected to an output terminal of a direct current source and a cathode connected to an output terminal of the pulse current modulator. A switching element is disposed between the output terminal of the direct current source and a ground potential, and is controlled by the control signal.
    Type: Grant
    Filed: April 26, 2011
    Date of Patent: March 17, 2015
    Assignee: NEC Corporation
    Inventor: Shinichi Hori
  • Publication number: 20150070098
    Abstract: Radio frequency (RF) amplification devices are disclosed along with methods of providing power to an RF signal. In one embodiment, an RF amplification device includes an RF amplification circuit and a voltage regulation circuit. The RF amplification circuit includes a plurality of RF amplifier stages coupled in cascade. The voltage regulation circuit is coupled to provide a regulated voltage to a driver RF amplifier stage. The voltage regulation circuit is configured to generate the regulated voltage so that the maximum output power of the RF amplification circuit is provided approximately at a first power level while the supply voltage is above a threshold voltage level. The first power level should be within the physical capabilities of the RF amplification circuit, and thus, the RF amplification circuit is prevented from being damaged once the supply voltage is above the threshold voltage level.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 12, 2015
    Inventors: David Q. Ngo, Michael B. Thomas, Praveen Varma Nadimpalli
  • Patent number: 8976606
    Abstract: A voltage generating circuit includes first and second step-up circuits, each having first and second input terminals and an output terminal and configured to increase a voltage level of an input signal supplied through the first input terminal and output the signal with the increased voltage level through the output terminal. The second input terminal of the first step-up circuit is connected to the output terminal of the second step-up circuit and the second input terminal of the second step-up circuit is connected to the output terminal of the first step-up circuit. The voltage generating circuit may also include third and fourth step-up circuits and fifth and sixth step-up circuits having similar configurations.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: March 10, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Noriyasu Kumazaki, Masafumi Uemura, Tatsuro Midorikawa
  • Patent number: 8975958
    Abstract: In a power supply circuit which uses a switching amplifier in combination with a linear amplifier, in order to be capable of correcting errors of operation of the switching amplifier and the linear amplifier, that is to say, in order to cause the switching amplifier and the linear amplifier to operate in coordination in a near-ideal state, the power supply circuit is provided with first amplification unit for delaying an input signal by a predetermined set time and amplifying the input signal, current detection unit for detecting a current value of an output signal of the first amplification unit, predicted signal generation unit for generating a pulse signal on a basis of an output signal of the current detection unit and the input signal, second amplification unit for amplifying the pulse signal and signal output unit for combining current of the output signal of the first amplification unit and current of the output signal of the second amplification unit to output the combined current, wherein the set tim
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: March 10, 2015
    Assignee: NEC Corporation
    Inventor: Kiyohiko Takahashi
  • Patent number: 8975960
    Abstract: An integrated circuit comprises a radio frequency (RF) power amplifier (PA) output stage; at least one amplifier stage prior to the RF PA output stage; a linear amplifier comprising a voltage feedback wherein the linear amplifier is operably coupled to a low frequency supply module such that the linear amplifier and low frequency supply module provide a combined first power supply to the RF PA output stage; and a switched mode power supply module arranged to provide a second power supply to the linear amplifier and to the at least one amplifier stage prior to the RF PA output stage.
    Type: Grant
    Filed: June 16, 2014
    Date of Patent: March 10, 2015
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Jonathan Richard Strange, Paul Fowers
  • Publication number: 20150061778
    Abstract: A high frequency power amplifying apparatus includes a power supply device for a high frequency power amplifying circuit, an RF signal processing circuit, and a high frequency power amplifying circuit. Bidirectional converters supplying and/or regenerating an electric charge are provided between an input section of an input voltage and an output section of an output voltage. A converter controlling circuit detects an envelope of an RF input signal, and sets and switches resonant frequencies and amplitudes of the bidirectional converters such that the output voltage follows an amplitude change of an envelope input signal. A delay time detecting circuit detects a delay time of the power supply device for a high frequency power amplifying circuit and makes an adjustment through a delay adjusting circuit.
    Type: Application
    Filed: November 7, 2014
    Publication date: March 5, 2015
    Inventor: Hitoshi TSUJI
  • Patent number: 8970294
    Abstract: A distribution amplifier with intellectual signaling comprises a first connector, a first amplifier, a second connector, a power regulator, an inductive coil, a voltage detecting circuit, a first indicating lamp, a second amplifier and a second indicating lamp. The distribution amplifier with intellectual signaling may effectively display whether the distribution amplifier operates normally or not according to the above-mentioned arrangement.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: March 3, 2015
    Assignee: Lantek Electronics, Inc.
    Inventor: Shan-Jui Lu
  • Patent number: 8970298
    Abstract: An audio playback loop circuit including an audio amplifier for amplifying an analog audio signal based on digitally controlled power supplies, and a digitally controlled power supply selection circuit for generating and selecting the digitally controlled power supplies based on a digital signal.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: March 3, 2015
    Assignee: Tempo Semiconductor, Inc.
    Inventor: Wade Zhu
  • Publication number: 20150054588
    Abstract: There is disclosed an envelope tracking supply modulator comprising a switch mode path and a linear amplifier path, wherein the linear amplifier path includes a plurality of amplifiers, each amplifier having an output stage of a different size, wherein at least one of the plurality of amplifiers is enabled in dependence on an output power.
    Type: Application
    Filed: August 22, 2014
    Publication date: February 26, 2015
    Inventor: Gerard Wimpenny
  • Publication number: 20150048891
    Abstract: A DC-DC converter, which provides a converter output voltage using a DC source voltage, is disclosed. The DC-DC converter includes converter control circuitry and a boosting charge pump. The converter control circuitry selects one of a first boost operating mode, a second boost operating mode, and a boost disabled mode based on the DC source voltage. During the boost disabled mode, the boosting charge pump presents a high impedance at a charge pump output of the boosting charge pump. Otherwise, the boosting charge pump provides a charge pump output voltage. During the first boost operating mode, a nominal value of the charge pump output voltage is equal to about one and one-half times the DC source voltage. During the second boost operating mode, a nominal value of the charge pump output voltage is equal to about two times the DC source voltage.
    Type: Application
    Filed: August 13, 2014
    Publication date: February 19, 2015
    Inventors: Ashraf Rozek, Michael R. Kay
  • Patent number: 8958577
    Abstract: A system and method for modulating the sound pressure that is output from an audio transducer is disclosed. In one embodiment, the method includes receiving an audio signal and placing the audio signal across a voice coil of the transducer. In addition, a voltage is applied across a field coil of the transducer, the field coil being separate from the voice coil. And the voltage that is applied across the field coil is adjusted so as to modulate the sound pressure output from the audio transducer.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: February 17, 2015
    Assignee: FluxTone, Inc.
    Inventor: Stephen L. Carey
  • Publication number: 20150042406
    Abstract: An amplifier circuit with a peak-to-average ratio detector is described. Detection of the peak-to-average ratio value can be used to tune one or more parameters that affect linearity of one or more amplifiers in the amplifier circuit to improve amplifier performance.
    Type: Application
    Filed: August 8, 2013
    Publication date: February 12, 2015
    Applicant: Peregrine Semiconductor Corporation
    Inventors: David Kovac, Kelly Michael Mekechuk
  • Publication number: 20150045095
    Abstract: A power amplifier containing a DC-DC converter, a linear amplifier and a control block. The DC-DC converter receives power from a power source and generates a regulated power supply voltage whose magnitude is controlled by the magnitude of a control signal provided to the DC-DC converter. The linear amplifier receives an input signal and generates a power-amplified output signal, and receives the regulated power supply voltage for operation. The control block is coupled to receive the input signal, and generates the control signal with a magnitude based on the amplitude of the input signal. The regulated power supply voltage is modulated based on the amplitude of the input signal, for peak-to-peak amplitudes of the power-amplified output greater than or less than or equal to the magnitude of the power source. High efficiency for the power amplifier is thereby obtained.
    Type: Application
    Filed: August 1, 2014
    Publication date: February 12, 2015
    Inventors: Arnold J D'Souza, Hariharan Srinivasan, Shyam Somayajula
  • Publication number: 20150035608
    Abstract: A distortion compensating apparatus includes: a memory; and a processor coupled to the memory and configured to: calculate a transient response of a power source circuit, in accordance with an estimated value of a current to be consumed by an amplifier based on a signal to be amplified by the amplifier, and in accordance with an objective supply voltage, based on the signal, of a voltage to be supplied to the amplifier from the power source circuit, and correct the signal to be input to the amplifier based on a difference caused by the transient response from the objective supply voltage.
    Type: Application
    Filed: July 30, 2014
    Publication date: February 5, 2015
    Inventors: Takumi MIYASHITA, Takeshi TAKANO
  • Publication number: 20150035607
    Abstract: Improvement in linearity is achieved at low costs in a power amplifier module employing an envelope tracking system. The power amplifier module includes a first power amplifier circuit that amplifies a radio frequency signal and that outputs a first amplified signal, a second power amplifier circuit that amplifies the first amplified signal on the basis of a source voltage varying depending on amplitude of the radio frequency signal and that outputs a second amplified signal, and a matching circuit that includes first and second capacitors connected in series between the first and second power amplifier circuit and an inductor connected between a node between the first and second capacitors and a ground and that decreases a gain of the first power amplifier circuit as the source voltage of the second power amplifier circuit increases.
    Type: Application
    Filed: July 10, 2014
    Publication date: February 5, 2015
    Inventors: Kiichiro Takenaka, Masahiro Ito, Masakazu Hori, Mitsuo Ariie, Hayato Nakamura, Satoshi Arayashiki, Hidetoshi Matsumoto, Tsuyoshi Sato, Satoshi Tanaka
  • Publication number: 20150035606
    Abstract: The invention relates to a method of calibrating an envelope path and an input path of an amplification stage including an envelope tracking power supply, the method comprising: generating input signals having a known relationship for each of the input and envelope paths; and varying an amplitude and a delay of the signal in one of the envelope and input paths in order to reduce the variation in the power detected in a signal at the output of the amplification stage.
    Type: Application
    Filed: May 16, 2012
    Publication date: February 5, 2015
    Applicant: NUJIRA LIMITED
    Inventor: Ben Bartram
  • Patent number: 8947162
    Abstract: An amplification stage comprising: an input scaling block for scaling an input signal based on an input scaling factor to generate a scaled version of the input signal; a power amplifier for receiving the scaled version of the input signal and for generating an amplified version of said signal; an envelope detector for generating a signal representing the envelope of the input signal; an envelope scaling block for scaling the envelope signal based on an envelope scaling factor to generate a scaled version of the envelope signal; a non-linear mapping block for generating a voltage representative of the supply voltage based on the scaled envelope signal; a modulator for generating a power supply voltage for the amplifier based on the voltage generated by the non-linear mapping block; and a power control block for maintaining a linear relationship between the envelope scaling factor and the input scaling factor.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: February 3, 2015
    Assignee: Nujira Limited
    Inventors: Gerard Wimpenny, Robert Henshaw
  • Patent number: 8947161
    Abstract: Circuitry, which includes a linear amplifier and a linear amplifier power supply, is disclosed. The linear amplifier at least partially provides an envelope power supply signal to a radio frequency (RF) power amplifier (PA) using a selected one of a group of linear amplifier supply voltages. The linear amplifier power supply provides at least one of the group of linear amplifier supply voltages. Selection of the selected one of the group of linear amplifier supply voltages is based on a desired voltage of the envelope power supply signal.
    Type: Grant
    Filed: December 3, 2012
    Date of Patent: February 3, 2015
    Assignee: RF Micro Devices, Inc.
    Inventors: Nadim Khlat, Philippe Gorisse
  • Publication number: 20150030184
    Abstract: An audio amplifier is provided with: an amplifier circuit; a power supply circuit that generates a plurality of power supply voltages; a power supply relay that selects one of the power supply voltages as the power supply voltage supplied to the amplifier circuit; a switching condition determiner that determines whether the switching condition of the power supply relay is satisfied; a silent section detector that detects a silent section of the audio signal which is equal to or greater than the operation time of the power supply relay; and a switching instruction unit for providing the power supply relay with an instruction for switching the power supply voltage during the silent section when the switching condition is satisfied and the silent section is detected.
    Type: Application
    Filed: February 6, 2013
    Publication date: January 29, 2015
    Inventor: Morito Yamada
  • Publication number: 20150022271
    Abstract: A method of providing a power supply of an amplifier of a wireless transmission system comprising, determining the power at an antenna when transmitting a signal to be transmitted by the amplifier, determining the modulation scheme for transmitting the signal, determining the frequency allocation of the signal to be transmitted, determining a transmit channel characteristic, and adjusting a parameter of the power supply of the amplifier based on the determining steps to maintain amplifier linearity.
    Type: Application
    Filed: July 18, 2014
    Publication date: January 22, 2015
    Inventors: Thomas Winiecki, Gregory G. F. Fron