Including Particular Power Supply Circuitry Patents (Class 330/297)
  • Patent number: 8570104
    Abstract: An amplifier assembly includes an input signal determiner that determines a first input signal and a second input signal based on an initial signal having an amplitude and an initial frequency. Amplifiers amplify the first and second input signal to form first and second output signals having a phase offset with respect to one another. The first and second amplified output signals are fed to a common coupling element that forms a useful signal and a loss signal, such that a total power of the useful signal and loss signal is independent of the phase offset, the power of the useful signal has a maximum corresponding to a predetermined value of the phase offset, and the partial power of the useful signal decreases with a deviation of the phase offset from the predetermined value.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: October 29, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventor: Oliver Heid
  • Patent number: 8570105
    Abstract: There is provided 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: Grant
    Filed: February 14, 2012
    Date of Patent: October 29, 2013
    Assignee: Nujira Limited
    Inventors: Gerard Wimpenny, Robert Henshaw
  • Publication number: 20130271225
    Abstract: A power module for envelope tracking includes a linear amplifier and a DC-to-DC (Direct Current to Direct Current) converter. The linear amplifier has a positive input terminal for receiving a first control signal, a negative input terminal, and an output terminal for outputting a first adaptive supply voltage, wherein the output terminal is fed back to the negative input terminal. The DC-to-DC converter receives a second control signal, and supplies a second adaptive supply voltage to the linear amplifier according to the second control signal. The first control signal is related to the second control signal.
    Type: Application
    Filed: September 12, 2012
    Publication date: October 17, 2013
    Applicant: MEDIATEK INC.
    Inventors: Chun-Yen TSENG, Yen-Hsun HSU
  • Publication number: 20130271223
    Abstract: A low-noise amplifier includes a first transistor having a gate configured to receive an oscillating input signal and a source coupled to ground. A second transistor has a source coupled to a drain of the first transistor, a gate coupled to a bias voltage, and a drain coupled to an output node. At least one of the first and second transistors includes a floating deep n-well that is coupled to an isolation circuit.
    Type: Application
    Filed: April 13, 2012
    Publication date: October 17, 2013
    Applicant: TAIWAN SEMICONDUCTOR MANUFACTURING CO., LTD.
    Inventors: Hsieh-Hung HSIEH, Yi-Hsuan LIU, Chiao-Han LEE, Tzu-Jin YEH, Chewn-Pu JOU
  • Patent number: 8558614
    Abstract: An amplification device that amplifies a signal, the amplification device includes an amplification unit that amplifies the signal using supplied power, a variable power supply unit that changes the power supplied to the amplification unit in accordance with an envelope of the signal, a radiation unit that radiates light onto the amplification unit, and a control unit that controls the light to be emitted from the radiation unit in accordance with slope of the envelope of the signal.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: October 15, 2013
    Assignee: Fujitsu Limited
    Inventors: Keiji Masuda, Yoshihiro Nozue, Masayuki Onuki
  • Publication number: 20130260703
    Abstract: Techniques and architecture are disclosed for providing an ultra-wideband, multi-channel solid-state power amplifier architecture. In some embodiments, the architecture includes a power divider which splits an input signal and delivers that split signal to a plurality of downstream channel chipsets. Each channel chipset is configured to amplify a sub-band of the original full-band input signal and to provide the resultant amplified sub-band for downstream use, such as for transmission by an antenna operatively coupled with that channel. In the aggregate, the amplified sub-bands provide coverage of the same ultra-wideband frequency range of the original input signal, in some cases. In some embodiments, the architecture provides high radio frequency (RF) power with good amplifying efficiency and ultra-wide instantaneous frequency bandwidth performance in a small-form-factor package.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 3, 2013
    Applicant: BAE SYSTEMS Information And Electronic Systems Integration Inc.
    Inventor: BAE SYSTEMS Information And Electronic Systems Integration Inc.
  • Patent number: 8543072
    Abstract: A high accuracy programmable gain amplifier has reduced temperature dependency, reduced supply voltage dependency, and supports accurate amplifier gain and accurate amplifier gain steps. The high accuracy programmable gain amplifier allows requirements compliant electronic devices to be fabricated that are capable of providing improved operational performance with less power consumption, hence extended battery life and improved operational availability. Electronic devices that incorporate the high accuracy programmable gain amplifier described below, may experience reduced variations in operational performance resulting in a reduced need for post production calibration, reduced calibration data storage requirements, and reduced device control processor cycles for use in performing calibration operations, thereby allowing such devices to be produced at a lower cost and/or to provide users with increased operational performance and/or increased battery life and, hence, increased operational availability.
    Type: Grant
    Filed: December 23, 2011
    Date of Patent: September 24, 2013
    Assignee: Marvell International Ltd.
    Inventor: Nir Yahav
  • Patent number: 8542061
    Abstract: The present disclosure relates to a direct current (DC)-DC converter, which includes a charge pump based radio frequency (RF) power amplifier (PA) envelope power supply and a charge pump based PA bias power supply. The DC-DC converter is coupled between RF PA circuitry and a DC power supply, such as a battery. As such, the PA envelope power supply provides an envelope power supply signal to the RF PA circuitry and the PA bias power supply provides a bias power supply signal to the RF PA circuitry. Both the PA envelope power supply and the PA bias power supply receive power via a DC power supply signal from the DC power supply. The PA envelope power supply includes a charge pump buck converter and the PA bias power supply includes a charge pump.
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: September 24, 2013
    Assignee: RF Micro Devices, Inc.
    Inventors: Chris Levesque, William David Southcombe, David E. Jones, Scott Yoder, Terry J. Stockert
  • Publication number: 20130241660
    Abstract: Generally, this disclosure provides an apparatus, method and system for DC-DC conversion. The apparatus may include a switch network including a first plurality of switches configured to operate in a Buck mode to generate an output voltage that is less than an input voltage, and a second plurality of switches configured to operate in an Up mode to generate an output voltage that is greater than the input voltage. The apparatus of this example may further include controller circuitry configured to generate control signals to control the conduction state of the first plurality of switches and the second plurality of switches based on a variable reference signal indicative of power demands from a load coupled to the switch network.
    Type: Application
    Filed: September 6, 2012
    Publication date: September 19, 2013
    Applicant: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventor: Pallab Midya
  • Patent number: 8538357
    Abstract: Systems and devices for radio frequency (RF) power amplification are disclosed. In one embodiment, a power amplification device includes a power amplification circuit operable to amplify an RF transmission signal and a voltage regulation circuit operable to generate a regulated voltage. The regulated voltage level of the regulated voltage sets an amplification gain of the power amplification circuit. The voltage regulation circuit allows the regulated voltage level closer to the saturation voltage level when a band-select signal indicates that the RF transmission signal is being transmitted within a low transmission frequency band and is further away from the saturation voltage level when the band-select signal indicates that the RF transmission signal is being transmitted within a high transmission frequency band. This provides greater power efficiency when the RF transmission signal is being transmitted with the low transmission frequency band.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: September 17, 2013
    Assignee: RF Micro Devices, Inc.
    Inventors: Erik Pedersen, Søren Deleurán Laursen, Jean-Christophe Berchtold
  • Patent number: 8536943
    Abstract: A method and apparatus is provided for linearizing the output of a non-linear device, such as a power amplifier. The input signal to the non-linear device is predistorted based on a predistortion model to compensate for distortion introduced by a non-linear device. A wideband feedback signal is generated from the output signal of the non-linear device, and the wideband feedback signal is filtered to generate two or more narrowband distortion signals with predetermined frequencies corresponding to anticipated distortion components in the output signal. Model parameters of the predistortion model are adapted based on the narrowband distortion signals.
    Type: Grant
    Filed: February 3, 2012
    Date of Patent: September 17, 2013
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventor: Garrick Thomas Irvine
  • Patent number: 8531240
    Abstract: Embodiments of power amplification devices are described with a power amplification circuit that has more than one amplifier stage and with at least a first voltage regulation circuit and a second voltage regulation circuit configured that provide regulated voltages to these amplifier stages. The power amplification device 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 first voltage adjustment gain of the first voltage regulation circuit when a regulated voltage level of a second voltage regulation circuit reaches a first threshold voltage level. In this manner, the first voltage adjustment gain can be initially set to be lower than the second voltage adjustment gain until the second voltage regulation circuit is close or has railed. The first voltage adjustment gain can then be increased to allow the first voltage regulation circuit to also rail.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: September 10, 2013
    Assignee: RF Micro Devices, Inc.
    Inventors: Lars Sandahl Ubbesen, Erik Pedersen, Søren Deleuran Laursen
  • Publication number: 20130231069
    Abstract: An envelope tracking power amplifier system time-aligns a supply voltage to an input signal to a power amplifier. The power supply operates in a static mode for low amplitude input signals and operates in a dynamic mode for high amplitude input signals. In the static mode, the power supply produces a substantially constant supply voltage independent of the amplitude of the input signal. In the dynamic mode the power supply produces a dynamically varying envelope tracking supply voltage based on the amplitude of the input signal. A first delay is determined based on portions of the input and output signals captured during static operation of the power supply and a second delay is determined based on portions of the input and output signals captured during dynamic operation. A delay mismatch is estimated based on a difference between the first and second delays.
    Type: Application
    Filed: February 27, 2013
    Publication date: September 5, 2013
    Applicant: QUANTANCE, INC.
    Inventor: Serge Francois Drogi
  • Publication number: 20130229235
    Abstract: There are provided a high-frequency amplifier and a high-frequency module having a high efficiency for an extensive input modulated signal power, and base station/mobile wireless machines using the amplifier or the module. The high-frequency amplifier includes a circuit that detects an envelope of an input modulated signal; a control signal generator circuit (a voltage controlled circuit or a current controlled circuit) that can change a voltage or a current according to a given function on the basis of a magnitude of the detected envelope signal; and a diode clamped variable power circuit that connects a plurality of diode clamped circuits each including a diode, a transistor, and a DC power supply to one another.
    Type: Application
    Filed: August 31, 2011
    Publication date: September 5, 2013
    Inventor: Masami Ohnishi
  • Patent number: 8525595
    Abstract: Power amplification devices are described, which are configured to amplify a radio frequency (RF) transmission signal. The power amplification device includes a voltage regulation circuit and a power amplification circuit. The voltage regulation circuit includes a voltage regulator that is operable to generate a regulated voltage from the supply voltage and a feedback circuit that sets a voltage adjustment gain of the voltage regulation circuit. To help prevent the voltage regulation circuit from saturating, the feedback circuit reduces the voltage adjustment gain in response to a voltage difference reaching a threshold voltage level. The voltage difference is between a voltage regulator control signal level of a voltage regulator control signal and the regulated voltage level of the regulated voltage.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: September 3, 2013
    Assignee: RF Micro Devices, Inc.
    Inventors: Jean-Christophe Berchtold, Erik Pedersen
  • Patent number: 8519788
    Abstract: Embodiments disclosed in the detailed description relate to a pseudo-envelope follower power management system for managing the power delivered to a linear RF power amplifier. The pseudo-envelope follower power management system may include a switch mode power supply converter and a parallel amplifier cooperatively coupled to provide a linear RF power amplifier supply to the linear RF power amplifier. The pseudo-envelope follower power management system may include a charge pump configured to power the parallel amplifier. The charge pump may generate a plurality of output voltage levels. The charge pump may be either a boost charge pump or a boost/buck charge pump. The pseudo-envelope follower power management system may include an offset voltage control circuit configured to provide feedback to the switch mode power supply converter to regulate an offset voltage developed across a coupling device that couples the output of the parallel amplifier to the linear RF power amplifier supply.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: August 27, 2013
    Assignee: RF Micro Devices, Inc.
    Inventor: Nadim Khlat
  • Patent number: 8514025
    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: June 6, 2012
    Date of Patent: August 20, 2013
    Assignee: Wolfson Microelectronics plc
    Inventor: John Paul Lesso
  • Patent number: 8514018
    Abstract: There is disclosed a method for determining the timing misalignment between a power supply and an output in an envelope tracking amplification stage, the method including the steps of: estimating a distortion parameter in the amplification stage; and determining a timing error in dependence on the estimated distortion parameter.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: August 20, 2013
    Assignee: Nujira Limited
    Inventor: Shaun Cummins
  • Patent number: 8514024
    Abstract: The embodiments of the present invention disclose a high power-supply rejection ratio (PSRR) amplifier circuit. The amplifier circuit comprises a low dropout regulator, a negative charge pump and an amplifier. The output voltages of the negative charge pump and the low dropout regulators don't track the change of input voltage. Therefore the amplifier circuit has high PSRR.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: August 20, 2013
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Rui Wang, Jinyan Lin, Huijie Zhao, Yunping Lang
  • Patent number: 8514016
    Abstract: An apparatus on a single integrated circuit (IC) die includes a multiple stage power amplifier having at least first and second stages, a multiple stage voltage regulator for providing a regulated voltage signal to the at least first and second stages of the multiple stage power amplifier, a power coupler for providing a portion of a power output of the multiple stage power amplifier to a power detector, the power detector for developing a power detect signal, and a power control loop including at least the second stage and an output stage of the multiple stage power amplifier, the power coupler, the power detector, and at least one stage of the multiple stage voltage regulator, the power control loop controlling only the second stage and the output stage of the multiple stage power amplifier.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: August 20, 2013
    Assignee: Skyworks Solutions, Inc.
    Inventors: David S. Ripley, Jamey D. Stroschine
  • Patent number: 8508297
    Abstract: An envelope amplifier includes an amplifier unit, a comparator unit and an output unit. The amplifier unit is made up of a first output section that outputs a first current in response to an amplitude of an input envelope signal, and a second output section. The second output section outputs a second current of a current value proportionate to a current value of the first current. Absolute value of the current value of the second current is greater than that of a current value of the first current. Comparator unit compares the current value of the first current. The output unit sums a current via an inductor derived from a current sustained or broken in response to a compared result of the comparator unit to the second current to deliver the resulting sum current at an output end. The first current is configured to be terminated without being delivered to the output unit (FIG. 1).
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: August 13, 2013
    Assignees: Renesas Electronics Corporation, NEC Corporation
    Inventors: Yuri Honda, Yuji Takahashi
  • Patent number: 8502607
    Abstract: A regulator with decreased leakage and low loss for a power amplifier is described. Switching circuitry is used to connect the regulator input bias to a bias control voltage when the power amplifier is to be operated in an on condition or to a voltage generator when the power amplifier is to be operated in an off condition.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: August 6, 2013
    Assignee: Peregrine Semiconductor Corporation
    Inventors: Jaroslaw Adamski, Daniel Losser, Vikas Sharma
  • Patent number: 8493142
    Abstract: An amplifier includes an envelope detection unit that detects an envelope of a transmission signal; a comparing unit that compares a voltage of the envelope with a reference voltage; a selecting unit that selects, in accordance with a comparison result obtained by the comparing unit, an amplifying element that amplifies the transmission signal from among a plurality of amplifying elements each having different operating power; a voltage control unit that controls, in accordance with the envelope, a voltage that is used to amplify the transmission signal in the amplifying element that is selected by the selecting unit; a current measuring unit that measures a current of a power supply that supplies the voltage that is controlled by the voltage control unit; and a reference voltage control unit that controls the reference voltage such that the current measured by the current measuring unit decreases.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: July 23, 2013
    Assignee: Fujitsu Limited
    Inventor: Tsuneaki Tadano
  • Patent number: 8493141
    Abstract: Embodiments disclosed in the detailed description relate to a pseudo-envelope follower power management system used to manage the power delivered to a linear RF power amplifier.
    Type: Grant
    Filed: April 19, 2011
    Date of Patent: July 23, 2013
    Assignee: RF Micro Devices, Inc.
    Inventors: Nadim Khlat, Michael R. Kay
  • Patent number: 8476978
    Abstract: A headphone driver amplifier operative without an external negative voltage power 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 (O volts), no significant DC voltage exists across the speaker load and the need for DC coupling capacitors is eliminated.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: July 2, 2013
    Assignee: Maxim Integrated Products, Inc.
    Inventor: Tony Doy
  • Patent number: 8461928
    Abstract: A method includes amplifying a non-constant-envelope input signal using a main amplifier having a first gain that varies depending on a supply voltage of the main amplifier. A constant-envelope signal is amplified using a reference amplifier having a second gain that varies depending on the supply voltage of the reference amplifier. Both the main amplifier and the reference amplifier are operated using a same variable supply voltage whose amplitude varies over time. A gain control signal is produced so as to compensate for changes in the second gain of the reference amplifier that are caused by the variable supply voltage. The gain control signal is applied in compensating for variations in the first gain of the main amplifier.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: June 11, 2013
    Assignee: Provigent Ltd.
    Inventors: Nir Yahav, Igal (Yehuda) Kushnir
  • Patent number: 8461931
    Abstract: A Multi-Mode Multi-Band (MMMB) radio frequency (RF) power amplifier circuit operating at multiple frequency bands. The power amplifier circuit comprises a single wideband power amplifier having high output impedance which is configured to be equal to a load impedance of the load connected to the power amplifier circuit. A bias voltage applied to the wideband power amplifier is changed from a first value to a second value to provide a predetermined output power of the wideband power amplifier to the load with the output impedance of wideband power amplifier being equal to the load impedance. The power amplifier circuit also includes an individual harmonic filter for filtering each frequency band independently.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: June 11, 2013
    Assignee: Anadigics, Inc.
    Inventors: Robert J. Bayruns, John VanSaders
  • Publication number: 20130141169
    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: Application
    Filed: December 3, 2012
    Publication date: June 6, 2013
    Applicant: RF MICRO DEVICES, INC.
    Inventor: RF MICRO DEVICES, INC.
  • Publication number: 20130127548
    Abstract: Apparatus and methods for voltage converters are provided. In one embodiment, a voltage conversion system includes a bypass circuit and a voltage converter including an inductor and a plurality of switches configured to control a current through the inductor. The bypass circuit includes a first p-type field effect transistor (PFET), a second PFET, a first n-type field effect transistor (NFET), and a second NFET. The first and second NFET transistors and the first and second PFET transistors are electrically connected between a first end and a second end of the inductor such that a source of the first PFET transistor and a drain of the first NFET transistor are electrically connected to the first end of the inductor and such that a drain of the second PFET transistor and a source of the second NFET transistor are electrically connected to the second end of the inductor.
    Type: Application
    Filed: November 7, 2012
    Publication date: May 23, 2013
    Applicants: NUJIRA LTD, Skyworks Solutions, Inc.
    Inventors: Skyworks Solutions, Inc., NUJIRA LTD
  • Publication number: 20130127547
    Abstract: There is disclosed an arrangement comprising: a driver stage connected to receive an input signal and generate a drive signal; a transformer comprising: a first winding of a first side of the transformer, across which winding a voltage signal is developed in dependence on the drive signal; and a second winding of the first side of the transformer, coupled to the first winding, which exhibits across it a voltage signal related to the voltage across the first winding, by swingback; and a first controller for comparing the voltage exhibited in the second winding to a first threshold voltage, and for selecting a first or a second supply voltage for the arrangement in dependence on the comparison.
    Type: Application
    Filed: March 29, 2011
    Publication date: May 23, 2013
    Applicant: NUJIRA LIMITED
    Inventor: Gerard Wimpenny
  • Patent number: 8446219
    Abstract: An apparatus comprising an input, a control signal generator coupled to the input and having a control signal generator output, and an amplifier coupled to the control signal generator output, wherein a voltage supplied to the amplifier is switched based on the control signal generator output, and wherein the control signal generator output is based on a data signal in the input. Also included is an apparatus comprising circuitry configured to implement a method comprising detecting an incoming signal, calculating a derivative of the incoming signal, estimating a future incoming signal based on the derivative of the incoming signal and a time step, and providing the estimated future incoming signal to switch between a first supply voltage and a second supply voltage prior to or concurrent with an arrival of the future incoming signal at the switch, wherein the incoming signal and the future incoming signal are analog signals.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: May 21, 2013
    Assignee: Futurewei Technologies, Inc.
    Inventors: Hessam Mohajeri, Amir H. Fazlollahi
  • Patent number: 8446216
    Abstract: Presently many audio chips suffer from pop issues, which is especially serious for single ended audio drivers. An audio pop is a disturbance in the output caused by a sudden transition of chip power, particularly when a chip is powered on or powered off. Furthermore, compensation networks included in the amplifiers on audio chips for stability offer a significant path for transmitting power disturbances to the output. Hence, circuitry is developed to suppress pops in the output stages of an amplifier.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: May 21, 2013
    Assignee: Conexant Systems, Inc.
    Inventors: Xin Fan, Christian Larsen, Lorenzo Crespi
  • Patent number: 8437723
    Abstract: There is provided an amplifier circuit including: a first transistor having a source thereof connected to an input port and having a gate thereof grounded; a second transistor having a gate thereof grounded; a first inductor provided between a drain of the first transistor and a source of the second transistor; and a second inductor provided between a drain of the second transistor and an output port.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: May 7, 2013
    Assignee: Fujitsu Limited
    Inventor: Masaru Sato
  • Patent number: 8436683
    Abstract: An audio amplifier circuit is described which comprises an operational amplifier. The operational amplifier receives an audio input signal and provides an output suitable for connecting a headphone, or a loudspeaker. A step-up converter is provided which supplies the operational amplifier. The audio amplifier is configured to operate in one of multiple operating modes, each of which uses a distinct supply voltage Vcc of the operational amplifier in the audio amplifier. Comparators are used to compare the output voltage of the operational amplifier with a first reference voltage to raise the supply voltage of the operational amplifier, if clipping is imminent. A second comparator is used to compare the output voltage of the operational amplifier with a second reference voltage, indicating that the supply voltage of the operational amplifier can be lowered without the risk of clipping.
    Type: Grant
    Filed: November 25, 2011
    Date of Patent: May 7, 2013
    Inventor: Robert Gehrke
  • Patent number: 8432228
    Abstract: A power control circuit for regulating an output voltage applied to a radio frequency power amplifier. The power control circuit includes an amplifier, a pass transistor and one or more saturation detectors. An input ramp voltage having a magnitude equal to a first voltage level is applied to a negative terminal of the amplifier. The pass transistor provides an output voltage at a drain terminal of the pass transistor. The saturation detector detects a magnitude of a voltage at a gate terminal of the pass transistor and generates a control current based on the magnitude of the voltage at the gate terminal of the pass transistor. The voltage regulating circuit reduces the magnitude of the input ramp voltage from the first voltage level to a third voltage level based on the control current.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: April 30, 2013
    Assignee: Anadigics, Inc.
    Inventor: Adam Joseph Dolin
  • Publication number: 20130093521
    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: Application
    Filed: October 15, 2012
    Publication date: April 18, 2013
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Samsung Electronics Co., Ltd.
  • Patent number: 8416969
    Abstract: An amplifier circuit comprises differential amplification circuitry comprising an input stage having first and second differential inputs, and an output stage, having respective first and second amplifier components with first and second differential outputs. The first amplifier component of the output stage comprises a first power transistor operably coupled to the first differential output and driven by a first differential output of the input stage, and a third power transistor operably coupled to the first differential output of the amplifier circuit and driven by a second output of the input stage. The second amplifier component comprises a second power transistor operably coupled to the second differential output and driven by a second output of the input stage, and a fourth power transistor operably coupled to the second differential output and driven by the first output of the input stage.
    Type: Grant
    Filed: November 15, 2007
    Date of Patent: April 9, 2013
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Jerome Enjalbert, Zakaria Mengad
  • Patent number: 8410855
    Abstract: A method of controlling power supply voltage of an audio amplifier delays an input audio signal; estimates, with a digital signal processor, an audio output level of the delayed input audio signal based on correlations between the delayed input audio signal level and audio level change factors; sets a value of power supply voltage supplied to a power switching circuit unit in correspondence with the estimated audio output level prior to outputting the delayed input audio signal on which the estimated audio output level is based; and amplifies the delayed audio input signal to provide an audio output signal by variably controlling the power supply voltage supplied to the power switching circuit unit according to the set value of power supply voltage.
    Type: Grant
    Filed: June 14, 2010
    Date of Patent: April 2, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Han-ki Kim, Hae-kwang Park
  • Patent number: 8400217
    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: May 1, 2012
    Date of Patent: March 19, 2013
    Assignee: Quantance, Inc.
    Inventors: Serge Francois Drogi, Martin A. Tomasz
  • Publication number: 20130063216
    Abstract: A power off delay circuit includes a switch connected between an external power input terminal and an internal power supply terminal, a capacitor connected to the internal power supply terminal, and a hysteresis comparator to switch the switch according to the voltages of the external power input terminal and the internal power supply terminal. During on-time of the switch, the external power input terminal is connected to the internal power supply terminal and the capacitor can be charged by the external power source. When the switch is off, the capacitor provides electric power for an internal circuit. Application of the power off delay circuit to an audio system may eliminate the turn-off pops of the audio system.
    Type: Application
    Filed: October 4, 2012
    Publication date: March 14, 2013
    Applicant: RICHTEK TECHNOLOGY CORP.
    Inventors: CHI-HUA LIN, CHIEN-FU TANG, ISAAC Y. CHEN, AN-TUNG CHEN
  • Patent number: 8395449
    Abstract: The present invention relates to a power supply control network of an amplifying active elements system enabling at least one control signal to be transmitted to N different control systems of the power supply voltage of P different composed active amplifying elements. It comprises a set of distributor elements of power supply control signals connected in cascade.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: March 12, 2013
    Assignee: PL Technologies AG
    Inventors: Christian Outin, Patrick Bureau, Jérôme David, Thierry Parquet, Didler Martineau
  • Publication number: 20130057351
    Abstract: This current-voltage converter(22) with a current reflector, the input current including a fixed component and a variable component, includes: an input (24) for the current to be converted; an output (26) for the converted voltage; a resistor (36) for current-voltage conversion arranged between the output (26) and the ground, the input (24) being connected to the output (26) for the circulation of the current to be converted in the resistor (36); and a current reflector circuit (38) including two constant current sources (40, 42) , each connected between the output (26) and a respective reference voltage (32, 34). This converter (22) also includes a cascode stage (44, 46) , mounted in series with each constant current generator (40, 42) in order to impose a constant potential difference on the terminals of each constant current generator (40, 42) regardless of the output voltage.
    Type: Application
    Filed: March 16, 2010
    Publication date: March 7, 2013
    Inventors: Mathias Moronvalle, Pierre-Emmanuel Calmel
  • Patent number: 8384483
    Abstract: A distributed power converter is for use with an RF power amplifier and includes a primary converter connected to an input voltage and configured to provide an unregulated DC intermediate voltage that is galvanically isolated from the input voltage. Additionally, the distributed power converter also includes a secondary regulator connected galvanically to the unregulated DC intermediate voltage and configured to generate a regulated DC supply voltage for at least a portion of the RF power amplifier. In another aspect, a method of operating a distributed power converter is for use with an RF power amplifier and includes providing an unregulated DC intermediate voltage that is galvanically isolated from an input voltage and generating a regulated DC supply voltage for at least a portion of the RF power amplifier that is galvanically connected to the unregulated DC intermediate voltage.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: February 26, 2013
    Assignee: General Electric Company
    Inventor: Michael J. Model
  • Publication number: 20130043953
    Abstract: Disclosed are methods, circuits and systems for regulating the output power of a transmission system. There may be provided a power amplifier (“PA”) adapted to operate across a range of supply voltages. The PA may operate under different bias profiles. There may be provided power amplifier regulation circuitry which may include a PA bias profile generator adapted to generate one or more bias profiles, wherein a given bias profile is associated with a given bias signal for the PA. A bias profile associated with a given bias signal for a given PA may include one or more PA parameters or settings to be applied to the given PA when it is operating with the given bias signal.
    Type: Application
    Filed: August 21, 2011
    Publication date: February 21, 2013
    Applicant: RIO SYSTEMS LTD.
    Inventor: Solon Jose Spiegel
  • Patent number: 8374196
    Abstract: Methods and apparatus for a switchable balun for combined BLUETOOTH® and WLAN operation. A switchable balun is provided that includes an input circuit for receiving an amplified signal, the input circuit comprising first and second coils connected at a center tap, an output circuit comprising a third coil that is inductively coupled to the first and second coils, the output circuit for outputting an adjusted version of the amplified signal for transmission in a selected transmission mode, and a switch coupled to the center tap, wherein the switch is configured to couple a first voltage to the center tap to select operation in a first transmission mode and to couple a second voltage to the center tap to select operation in a second transmission mode.
    Type: Grant
    Filed: February 19, 2010
    Date of Patent: February 12, 2013
    Assignee: QUALCOMM, Incorporated
    Inventor: Troy Stockstad
  • Patent number: 8373506
    Abstract: A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage.
    Type: Grant
    Filed: April 14, 2010
    Date of Patent: February 12, 2013
    Assignee: Wolfson Microelectronics plc
    Inventors: John Paul Lesso, John Laurence Pennock, Peter John Frith
  • Publication number: 20130033328
    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: Application
    Filed: February 3, 2012
    Publication date: February 7, 2013
    Applicant: THX, LTD
    Inventors: Owen Jones, Lawrence R. Fincham
  • Publication number: 20130027138
    Abstract: An amplifier circuit (10) comprises a driver stage (11) with a driver output (13). Moreover, the amplifier circuit (10) comprises a sensor (12). The sensor (12) comprises a variable attenuator (15) with a control input (16) for receiving a mode signal (SMODE). A sensor output (14) of the sensor (12) is coupled to the driver output (13) via the variable attenuator (15). A sensor signal (SE_RFOUT) is provided at the sensor output (14).
    Type: Application
    Filed: February 4, 2010
    Publication date: January 31, 2013
    Applicant: EPCOS AG
    Inventors: Carem Destouches, Bart Balm
  • Patent number: 8362649
    Abstract: Embodiments for at least one method and apparatus of a multi-use voltage regulator providing a supply voltage to a power amplifier and at least one other device are disclosed. One method includes generating a plurality of regulated voltage supplies from an unregulated voltage. An output signal power level of the power amplifier is determined. A one of the regulated plurality of voltage supplies and the unregulated voltage supply is selected as a power amplifier voltage supply for the power amplifier based at least in part on the output signal power level of the power amplifier. If the selected power amplifier voltage supply is one of the plurality of regulated voltage supplies, then the selected one of the plurality of regulated voltage supplies is simultaneously provided to the power amplifier and the at least one other device.
    Type: Grant
    Filed: June 18, 2010
    Date of Patent: January 29, 2013
    Assignee: R2 Semiconductor, Inc.
    Inventors: David Fisher, Ravi Ramachandran
  • Patent number: 8362838
    Abstract: A signal processing system and method utilizes a multi-stage amplifier to amplify an input signal. The multi-stage amplifier uses a mixed set of voltage rails to improve the operating efficiency of at least one of the amplification stages while allowing other amplification stages to operate in a predetermined operating mode. Efficiency of at least one of the stages is improved by supplying at least one variable voltage rail to an amplification stage of the multi-stage amplifier. The variable voltage rail varies in response to changes in an input signal voltage to the amplification stage. Accordingly, at least one amplification stage utilizes a variable voltage rail, and all amplification stages are supplied with a set of voltage rails that provides sufficient input signal headroom, thus, providing amplification stage efficiency and adequate voltage to allow operation of all amplification stages.
    Type: Grant
    Filed: March 30, 2007
    Date of Patent: January 29, 2013
    Assignee: Cirrus Logic, Inc.
    Inventors: John C. Tucker, Ammisetti V. Prasad