Including Particular Power Supply Circuitry Patents (Class 330/297)
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Patent number: 9041479Abstract: 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: GrantFiled: December 6, 2010Date of Patent: May 26, 2015Assignee: STRYKER COMBO, L.L.C.Inventors: Regis J. Nero, Jr., Jeffrey A. Gibala
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Patent number: 9041462Abstract: 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: GrantFiled: November 18, 2010Date of Patent: May 26, 2015Assignee: DSP GROUP LTD.Inventor: Svetlana Kantor
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Patent number: 9041468Abstract: 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: GrantFiled: March 20, 2013Date of Patent: May 26, 2015Assignee: NXP B.V.Inventors: Benno Krabbenborg, Marco Berkhout, Johan Somberg, Peter Van De Haar
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Patent number: 9041464Abstract: 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: GrantFiled: September 13, 2012Date of Patent: May 26, 2015Assignee: QUALCOMM IncorporatedInventors: Christos Komninakis, Vijay K. Chellappa, Jifeng Geng
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Publication number: 20150137893Abstract: 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: ApplicationFiled: January 29, 2015Publication date: May 21, 2015Inventor: Gerard Wimpenny
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Publication number: 20150137892Abstract: 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: ApplicationFiled: March 20, 2014Publication date: May 21, 2015Applicant: Panasonic Intellectual Property Management Co., Lt d.Inventors: Isao Imazeki, Masaki Kanemaru
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Patent number: 9035699Abstract: 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: GrantFiled: December 19, 2012Date of Patent: May 19, 2015Assignee: QUALCOMM IncorporatedInventor: Vijayakumar Dhanasekaran
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Patent number: 9030261Abstract: 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: GrantFiled: June 14, 2012Date of Patent: May 12, 2015Assignee: Bang & Olufsen Icepower A/SInventor: Mads Peter Frium
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Publication number: 20150123733Abstract: 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: ApplicationFiled: January 8, 2015Publication date: May 7, 2015Inventors: Gerard Wimpenny, Robert Henshaw
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Publication number: 20150123735Abstract: 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: ApplicationFiled: October 21, 2014Publication date: May 7, 2015Inventor: Gerard Wimpenny
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Patent number: 9013239Abstract: 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: GrantFiled: May 2, 2014Date of Patent: April 21, 2015Assignee: Crestron Electronics Inc.Inventor: Robert Buono
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Patent number: 9008332Abstract: 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: GrantFiled: September 29, 2011Date of Patent: April 14, 2015Assignee: Beijing KT Micro, Ltd.Inventors: Wenjing Wang, Jianting Wang, Rongrong Bai, Jing Cao
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Publication number: 20150097625Abstract: 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: ApplicationFiled: October 7, 2013Publication date: April 9, 2015Applicant: Nokia CorporationInventor: Faizan UL HAQ
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Patent number: 9000843Abstract: 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: GrantFiled: April 17, 2014Date of Patent: April 7, 2015Assignee: Intel CorporationInventors: Nicholas P. Cowley, Isaac Ali, William L. Barber
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Publication number: 20150091655Abstract: 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: ApplicationFiled: October 22, 2013Publication date: April 2, 2015Inventors: Dmitriy Rozenblit, Vipin Kumar Aggarwal
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Publication number: 20150084701Abstract: 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: ApplicationFiled: September 24, 2013Publication date: March 26, 2015Applicant: Eta Devices, Inc.Inventors: David J. Perreault, Wei Li, Yevgeniy A. Tkachenko
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Patent number: 8988149Abstract: 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: GrantFiled: July 15, 2013Date of Patent: March 24, 2015Assignee: Cirrus Logic International (UK) LimitedInventor: John Paul Lesso
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Patent number: 8981847Abstract: 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: GrantFiled: February 8, 2013Date of Patent: March 17, 2015Assignee: Skyworks Solutions, Inc.Inventor: Florinel G Balteanu
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Patent number: 8981851Abstract: 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: GrantFiled: April 26, 2011Date of Patent: March 17, 2015Assignee: NEC CorporationInventor: Shinichi Hori
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Publication number: 20150070098Abstract: 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: ApplicationFiled: September 5, 2014Publication date: March 12, 2015Inventors: David Q. Ngo, Michael B. Thomas, Praveen Varma Nadimpalli
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Patent number: 8975960Abstract: 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: GrantFiled: June 16, 2014Date of Patent: March 10, 2015Assignee: MediaTek Singapore Pte. Ltd.Inventors: Jonathan Richard Strange, Paul Fowers
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Patent number: 8975958Abstract: 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 timType: GrantFiled: November 30, 2011Date of Patent: March 10, 2015Assignee: NEC CorporationInventor: Kiyohiko Takahashi
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Patent number: 8976606Abstract: 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: GrantFiled: March 1, 2013Date of Patent: March 10, 2015Assignee: Kabushiki Kaisha ToshibaInventors: Noriyasu Kumazaki, Masafumi Uemura, Tatsuro Midorikawa
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Publication number: 20150061778Abstract: 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: ApplicationFiled: November 7, 2014Publication date: March 5, 2015Inventor: Hitoshi TSUJI
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Patent number: 8970298Abstract: 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: GrantFiled: September 2, 2011Date of Patent: March 3, 2015Assignee: Tempo Semiconductor, Inc.Inventor: Wade Zhu
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Patent number: 8970294Abstract: 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: GrantFiled: November 15, 2012Date of Patent: March 3, 2015Assignee: Lantek Electronics, Inc.Inventor: Shan-Jui Lu
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Publication number: 20150054588Abstract: 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: ApplicationFiled: August 22, 2014Publication date: February 26, 2015Inventor: Gerard Wimpenny
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Publication number: 20150048891Abstract: 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: ApplicationFiled: August 13, 2014Publication date: February 19, 2015Inventors: Ashraf Rozek, Michael R. Kay
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Patent number: 8958577Abstract: 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: GrantFiled: November 4, 2011Date of Patent: February 17, 2015Assignee: FluxTone, Inc.Inventor: Stephen L. Carey
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Publication number: 20150042406Abstract: 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: ApplicationFiled: August 8, 2013Publication date: February 12, 2015Applicant: Peregrine Semiconductor CorporationInventors: David Kovac, Kelly Michael Mekechuk
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Publication number: 20150045095Abstract: 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: ApplicationFiled: August 1, 2014Publication date: February 12, 2015Inventors: Arnold J D'Souza, Hariharan Srinivasan, Shyam Somayajula
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Publication number: 20150035607Abstract: 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: ApplicationFiled: July 10, 2014Publication date: February 5, 2015Inventors: Kiichiro Takenaka, Masahiro Ito, Masakazu Hori, Mitsuo Ariie, Hayato Nakamura, Satoshi Arayashiki, Hidetoshi Matsumoto, Tsuyoshi Sato, Satoshi Tanaka
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Publication number: 20150035606Abstract: 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: ApplicationFiled: May 16, 2012Publication date: February 5, 2015Applicant: NUJIRA LIMITEDInventor: Ben Bartram
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Publication number: 20150035608Abstract: 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: ApplicationFiled: July 30, 2014Publication date: February 5, 2015Inventors: Takumi MIYASHITA, Takeshi TAKANO
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Patent number: 8947161Abstract: 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: GrantFiled: December 3, 2012Date of Patent: February 3, 2015Assignee: RF Micro Devices, Inc.Inventors: Nadim Khlat, Philippe Gorisse
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Patent number: 8947162Abstract: 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: GrantFiled: October 25, 2013Date of Patent: February 3, 2015Assignee: Nujira LimitedInventors: Gerard Wimpenny, Robert Henshaw
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Publication number: 20150030184Abstract: 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: ApplicationFiled: February 6, 2013Publication date: January 29, 2015Inventor: Morito Yamada
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Publication number: 20150022271Abstract: 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: ApplicationFiled: July 18, 2014Publication date: January 22, 2015Inventors: Thomas Winiecki, Gregory G. F. Fron
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Publication number: 20150015340Abstract: 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: ApplicationFiled: September 17, 2014Publication date: January 15, 2015Inventors: Hui Liu, David Steven Ripley
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Patent number: 8928403Abstract: The invention relates to a method of calibrating an envelope path and an input path of an amplification stage of an envelope tracking power supply, the method comprising matching the envelope path to at least one characteristic of at least one element of the input path.Type: GrantFiled: March 30, 2012Date of Patent: January 6, 2015Assignee: Nujira LimitedInventor: Ben Bartram
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Publication number: 20150002235Abstract: Techniques for dynamically generating a headroom voltage for an envelope tracking system. In an aspect, an initial headroom voltage is updated when a signal from a power amplifier (PA) indicates that the PA headroom is insufficient. The initial headroom voltage may be updated to an operating headroom voltage that includes the initial voltage plus a deficiency voltage plus a margin. In this manner, the operating headroom voltage may be dynamically selected to minimize power consumption while still ensuring that the PA is linear. In a further aspect, a specific exemplary embodiment of a headroom voltage generator using a counter is described.Type: ApplicationFiled: September 16, 2014Publication date: January 1, 2015Inventors: Lennart Karl-Axel MATHE, Pengfei LI, Song S. SHI, Yunfei SHI, Joseph D. RUTKOWSKI
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Publication number: 20150002233Abstract: There is disclosed a method and apparatus for generating an output signal comprising a replica of an input signal, comprising the steps of: generating a replica signal representing the low frequency content of the input signal; generating an error signal representing an error in the replica signal; combining the replica signal with the error signal to generate an output signal; and wherein the step of generating the error signal further includes the steps of: generating a delay signal being a delayed version of the input signal; and determining a difference between the output signal and the delay signal which difference is the error signal.Type: ApplicationFiled: September 9, 2014Publication date: January 1, 2015Inventor: Gerard Wimpenny
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Publication number: 20150002232Abstract: In a power supply device, bidirectional converters that are each capable of supplying or regenerating an electric charge are provided between an input section for an input voltage and an output section for an output voltage. An amplitude change monitor circuit detects an envelope of an RF input signal. A converter switching circuit controls supply and regeneration of electric charges by the bidirectional converters so that the output voltage follows an amplitude change of the input signal. An output capacitor capacitance estimation unit estimates the capacitance of an output capacitor from its voltage and current. A delay time detection circuit grasps a delay time of a power supply device for a high frequency power amplification circuit and makes an adjustment through a delay adjustment circuit.Type: ApplicationFiled: December 18, 2013Publication date: January 1, 2015Inventor: Hitoshi TSUJI
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Publication number: 20150002234Abstract: There is disclosed a method, in an amplifier stage comprising an amplifier and a modulated supply, the amplifier being arranged to amplify an input signal and the modulated supply being arranged to generate a supply voltage for the amplifier by tracking an envelope of the signal to be amplified, the method comprising: comparing the relative timing of a signal representing the current drawn by the amplifier from the modulated supply and a signal representing the voltage generated at the output of the modulated supply; and in dependence upon a difference in the relative timing, adjusting the timing of either the input signal to be amplified or the generated supply voltage to reduce the difference in the relative timing.Type: ApplicationFiled: September 12, 2014Publication date: January 1, 2015Inventor: Martin Wilson
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Patent number: 8917142Abstract: A switching circuit 33 comprises a connection circuit cascade-connecting control terminals for controlling switching of n number of transistors M1-Mn via n?1 number of coils L1 respectively (n is an integer equal to or more than 2; and coils L3 respectively connected between one end of each of the transistors M1-Mn and other end of a coil L2, one end of the coil L2 being electrically connected to a DC power source. The transistors M1-Mn is sequentially switched with PWM signals inputted to an input terminal of the connection circuit. The switching circuit 33 further comprises a transistor M0 inserted at the one end or the other end of the coil L2 in cascade-connection.Type: GrantFiled: October 26, 2012Date of Patent: December 23, 2014Assignees: Sumitomo Electric Industries, Ltd., National University Corporation Toyohashi University of TechnologyInventors: Satoshi Hatsukawa, Kazuhiro Fujikawa, Takashi Tsuno, Nobuo Shiga, Takashi Ohira, Kazuyuki Wada, Tuya Wuren, Kotaro Tanimura
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Publication number: 20140361837Abstract: 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: ApplicationFiled: June 16, 2014Publication date: December 11, 2014Inventors: Jonathan Richard Strange, Paul Fowers
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Patent number: 8909180Abstract: A transmitter power supply modulates an RF signal without needing to run a calibration/training cycle every time an exciter or PA module is switched in and out or every time the transmitter powers up. During calibration of the exciter module, an exciter module delay factor is determined, and stored in the exciter module, for each signal modulation scheme that may be implemented by the exciter module. During calibration of a power amplifier (PA) module, a power supply modulation (PSM) delay factor is determined for, and stored in, the PA module. During transmitter operation, the exciter module generates RF and envelope signals based on an input signal. The PA module generates a power supply voltage based on the envelope signal and a final delay factor, which final delay factor is based on the exciter module and PSM delay factors. The PA module then modulates the RF signal using the power supply voltage.Type: GrantFiled: June 26, 2013Date of Patent: December 9, 2014Assignee: Motorola Solutions, Inc.Inventor: Rizwan Murji
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Patent number: 8909175Abstract: A transmitter (70) generates a time-varying, detroughed, biasing signal (154) for an RF power amplifier (10) so that the RF power amplifier (10) is biased in accordance with an envelope tracking scheme. A trough-filling section (94) is responsive to an envelope tracking signal (86), which in turn is responsive to a magnitude signal (90) extracted from a complex baseband communication signal (76). The trough-filing section (94) includes a limiting stage (108) that forms a raw troughing signal (110) which expands the bandwidth of the envelope tracking signal (86). A filtering stage (116) reduces the bandwidth of the raw troughing signal (110) to form a trough-filling signal (122) that is combined back into the envelope tracking signal (86) using a linear process that maintains the bandwidth of the envelope tracking signal (86).Type: GrantFiled: June 27, 2013Date of Patent: December 9, 2014Assignee: CrestCom, Inc.Inventor: Ronald Duane McCallister
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Publication number: 20140355715Abstract: The present invention provides a power supply device, a method for managing power supply thereof and a wireless communication terminal.Type: ApplicationFiled: April 5, 2012Publication date: December 4, 2014Applicant: ZTE CorporationInventor: Dongping Hu
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Patent number: 8902005Abstract: Apparatus and methods reduce increase the common mode range of a difference amplifier. A circuit uses one or more floating powers and one or more floating grounds coupled to an input stage of an amplifier to increase the common mode range of a difference amplifier. The floating power can be configured to select from the greater of the voltage level of one of the differential signals and the system power high source. The floating ground can be configured to select from the lesser of the voltage level of one of the differential signals and the system power low source.Type: GrantFiled: September 25, 2012Date of Patent: December 2, 2014Assignee: Analog Devices, Inc.Inventor: Quan Wan