Including Particular Power Supply Circuitry Patents (Class 330/297)
  • Publication number: 20150015340
    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: Application
    Filed: September 17, 2014
    Publication date: January 15, 2015
    Inventors: Hui Liu, David Steven Ripley
  • Patent number: 8928403
    Abstract: 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: Grant
    Filed: March 30, 2012
    Date of Patent: January 6, 2015
    Assignee: Nujira Limited
    Inventor: Ben Bartram
  • Publication number: 20150002235
    Abstract: 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: Application
    Filed: September 16, 2014
    Publication date: January 1, 2015
    Inventors: Lennart Karl-Axel MATHE, Pengfei LI, Song S. SHI, Yunfei SHI, Joseph D. RUTKOWSKI
  • Publication number: 20150002233
    Abstract: 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: Application
    Filed: September 9, 2014
    Publication date: January 1, 2015
    Inventor: Gerard Wimpenny
  • Publication number: 20150002234
    Abstract: 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: Application
    Filed: September 12, 2014
    Publication date: January 1, 2015
    Inventor: Martin Wilson
  • Publication number: 20150002232
    Abstract: 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: Application
    Filed: December 18, 2013
    Publication date: January 1, 2015
    Inventor: Hitoshi TSUJI
  • Patent number: 8917142
    Abstract: 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: Grant
    Filed: October 26, 2012
    Date of Patent: December 23, 2014
    Assignees: Sumitomo Electric Industries, Ltd., National University Corporation Toyohashi University of Technology
    Inventors: Satoshi Hatsukawa, Kazuhiro Fujikawa, Takashi Tsuno, Nobuo Shiga, Takashi Ohira, Kazuyuki Wada, Tuya Wuren, Kotaro Tanimura
  • Publication number: 20140361837
    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: Application
    Filed: June 16, 2014
    Publication date: December 11, 2014
    Inventors: Jonathan Richard Strange, Paul Fowers
  • Patent number: 8909175
    Abstract: 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: Grant
    Filed: June 27, 2013
    Date of Patent: December 9, 2014
    Assignee: CrestCom, Inc.
    Inventor: Ronald Duane McCallister
  • Patent number: 8909180
    Abstract: 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: Grant
    Filed: June 26, 2013
    Date of Patent: December 9, 2014
    Assignee: Motorola Solutions, Inc.
    Inventor: Rizwan Murji
  • Publication number: 20140355715
    Abstract: The present invention provides a power supply device, a method for managing power supply thereof and a wireless communication terminal.
    Type: Application
    Filed: April 5, 2012
    Publication date: December 4, 2014
    Applicant: ZTE Corporation
    Inventor: Dongping Hu
  • Patent number: 8902005
    Abstract: 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: Grant
    Filed: September 25, 2012
    Date of Patent: December 2, 2014
    Assignee: Analog Devices, Inc.
    Inventor: Quan Wan
  • Patent number: 8902002
    Abstract: There is provided a bias arrangement for an amplifier adapted to amplify a varying input signal, the arrangement comprising a control circuit arranged to adaptively vary a bias current to the amplifier in dependence on an envelope of the varying input signal.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: December 2, 2014
    Assignee: Nujira Limited
    Inventor: Russell Fagg
  • Patent number: 8896383
    Abstract: A variable supply rail generator is described. The variable supply rail generator includes a regulator configured to use an estimated load current for a power amplifier to optimize efficiency. The variable supply rail generator also includes a power amplifier controller. The power amplifier controller provides the estimated load current to the regulator.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: November 25, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Vijayakumar Dhanasekaran
  • Publication number: 20140340158
    Abstract: Kickback current from a charge pump to a power management integrated circuit (PMIC) may be reduced by dissipating charge from fly and hold capacitors during mode transitions. A switch may be placed in series between the charge pump and the PMIC to disconnect the charge pump and prevent kickback current from reaching the PMIC. Further, additional loads, as switches, may be coupled to the charge pump outputs to dissipate charge from the fly and hold capacitors. Additionally, a closed feedback loop may be used to monitor and discharge excess charge from the fly and hold capacitors during mode transitions. Furthermore, charge may be redistributed between the fly and hold capacitors during mode transitions to reduce the time period of the transition.
    Type: Application
    Filed: December 16, 2013
    Publication date: November 20, 2014
    Applicant: CIRRUS LOGIC, INC.
    Inventors: Bharath Kumar Thandri, Thuan L. Nguyen, Daniel John Allen, Lingli Zhang, Aniruddha Satoskar, Aaron Brennan, Dan Shen
  • Patent number: 8890617
    Abstract: Techniques for monitoring and controlling bias current of amplifiers are described. In an exemplary design, an apparatus may include an amplifier and a bias circuit. The amplifier may include at least one transistor coupled to an inductor. The bias circuit may generate at least one bias voltage for the at least one transistor in the amplifier to obtain a target bias current for the amplifier. The bias circuit may generate the at least one bias voltage based on a voltage across the inductor in the amplifier, or a current through a current mirror formed with one of the at least one transistor in the amplifier, or a gate-to-source voltage of one of the at least one transistor in the amplifier, or a voltage in a replica circuit replicating the amplifier, or a current applied to the amplifier with a switched mode power supply disabled.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: November 18, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Thomas Domenick Marra, Aristotele Hadjichristos, Nathan M. Pletcher
  • Patent number: 8884703
    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 is configured to generate a regulated voltage for the power amplification device from a supply voltage and to adjust a regulated voltage level of the regulated voltage in accordance with a voltage adjustment gain. The voltage adjustment gain of the voltage regulation circuit is set by a feedback resistance. To help prevent the voltage regulation circuit from saturating, the voltage regulation circuit adjusts the feedback resistance to reduce the voltage regulation gain.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: November 11, 2014
    Assignee: RF Micro Devices, Inc.
    Inventors: Jean-Christophe Berchtold, Erik Pedersen
  • Patent number: 8884714
    Abstract: An amplifier receives an amplitude signal of a polar modulated signal at a base terminal of a transistor and receives a phase modulated carrier signal of the polar modulated signal at the base terminal of the transistor. The amplifier combines the amplitude signal and the phase modulated signal to produce a full complex waveform at a collector terminal of the transistor.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: November 11, 2014
    Assignee: Pine Valley Investments, Inc.
    Inventors: Eoin Carey, Pierce Joseph Nagle
  • Patent number: 8884702
    Abstract: To improve upon efficiency of a transmitter's power amplifier during low power operation, a switching system is used to selectively switch between different (e.g., normal and reduced) power supplies. Suitable hardware/software in the form of circuitry, logic gates, and/or code functions to process, amplify, and transmit an input RF signal and selectively switch IN/OUT a plurality of supply voltages using control logic.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: November 11, 2014
    Assignee: Broadcom Corporation
    Inventors: Ali Afsahi, Arya Reza Behzad, Ali Karimi-Sanjaani, Dandan Li, Kyujin Oh, Prasad Sitaram
  • Patent number: 8884696
    Abstract: A control circuit and a method for controlling an operation of a power amplifier core are provided. The power amplifier core is switchable between an envelope tracking operation mode and a non-envelope tracking operation mode. The control circuit is configured to provide a control signal for controlling the operation of the power amplifier core or to process an amplified signal received from the power amplifier core in dependence on the operation mode of the power amplifier core.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: November 11, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventor: Andreas Langer
  • Publication number: 20140327485
    Abstract: A power module at least includes an ET (Envelope Tracking) module. The ET module includes a buck converter, an inductor, and a capacitor. The buck converter is coupled to a work voltage. The buck converter has a first input terminal for receiving a first control signal, a second input terminal coupled to a supply node, and a buck output terminal The inductor is coupled between the buck output terminal of the buck converter and the supply node. The capacitor is coupled between the supply node and a ground voltage. The ET module is configured to supply a first adaptive supply voltage at the supply node. The first adaptive supply voltage is determined according to the first control signal.
    Type: Application
    Filed: July 21, 2014
    Publication date: November 6, 2014
    Inventors: Chun-Yen TSENG, Yen-Hsun HSU
  • Patent number: 8878607
    Abstract: A signal processing circuit has a first circuit, a digital-to-analog converter (DAC) and a second circuit. The first circuit receives a digital input signal with a non-zero direct current (DC) component, and subtracts at least a portion of the DC) component of the received digital input signal from the received digital input signal. The DAC is operably coupled to the first circuit, and arranged to perform a digital-to-analog conversion upon an output of the first circuit. The second circuit is operably coupled to the DAC, and arranged to add a DC component to an analog output signal derived from an output of the DAC. The signal processing circuit may be part of an integrated circuit or a wireless communication unit.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: November 4, 2014
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Jonathan Richard Strange, Paul Fowers
  • Patent number: 8872582
    Abstract: An amplifier circuit includes: a first filter that receives input of amplitude information of an input signal, and performs filtering so that a gain of a frequency component higher than a first cutoff frequency becomes greater than a gain of a frequency component lower than the first cutoff frequency; a power supply circuit that has a low-pass filter characteristic that a gain of a frequency component lower than a second cutoff frequency is greater than a gain of a frequency component higher than the second cutoff frequency, and receives input of amplitude information outputted from the first filter and generates a power supply voltage corresponding to the amplitude information outputted from the first filter; and an amplifier that receives supply of the power supply voltage generated by the power supply circuit, and amplifies a signal based on the input signal.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: October 28, 2014
    Assignee: Fujitsu Limited
    Inventor: Kazuaki Oishi
  • Publication number: 20140312970
    Abstract: A power supply circuit includes: a push-pull amplifier unit which amplifies an input signal with a push-pull amplification protocol; a variable power supply unit which varies, with a control signal, the voltage level of a power supply voltage which is supplied to the push-pull amplifier; a switch control unit which, on the basis of the input signal, outputs the control signal which controls the voltage level of the power supply voltage; and a timing control unit which applies a specified time delay to the input signal. When the control signal rises, the switch control unit causes the control signal to rise at a faster timing, according to the voltage level switch transition timing, than a delay time upon the timing control unit, and when the control signal falls, the switch control unit causes the control signal to fall at the timing of the delay time.
    Type: Application
    Filed: November 19, 2012
    Publication date: October 23, 2014
    Applicant: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Toshiyuki Nagasaku, Manabu Nakamura, Taizo Ito
  • Patent number: 8866547
    Abstract: 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: Grant
    Filed: January 28, 2013
    Date of Patent: October 21, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Lennart Karl-Axel Mathe, Pengfei Li, Song S Shi, Yunfei Shi, Joseph D Rutkowski
  • Patent number: 8866546
    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: October 21, 2014
    Assignee: Skyworks Solutions, Inc.
    Inventors: Hui Liu, David Steven Ripley
  • Publication number: 20140306769
    Abstract: Power supply circuitry, which includes a parallel amplifier and a parallel amplifier power supply, is disclosed. The power supply circuitry operates in either an average power tracking mode or an envelope tracking mode. The parallel amplifier power supply provides a parallel amplifier power supply signal. The parallel amplifier regulates an envelope power supply voltage based on an envelope power supply control signal using the parallel amplifier power supply signal, which provides power for amplification. During the envelope tracking mode, the envelope power supply voltage at least partially tracks an envelope of an RF transmit signal and the parallel amplifier power supply signal at least partially tracks the envelope power supply control signal. During the average power tracking mode, the envelope power supply voltage does not track the envelope of the RF transmit signal.
    Type: Application
    Filed: April 16, 2014
    Publication date: October 16, 2014
    Applicant: RF Micro Devices, Inc.
    Inventors: Nadim Khlat, Baker Scott, Michael R. Kay
  • Publication number: 20140306768
    Abstract: An operational amplifier circuit including a main circuit, a compensation capacitor, a power circuit, and a set of switches is disclosed. The main circuit has an output terminal. The compensation capacitor has a first end connected to an internal node of the main circuit and a second end connected to the output terminal of the main circuit. The power circuit provides a current or a voltage as predetermined. The set of switches connects the power circuit to the compensation capacitor. When the main circuit is not in an output state, the set of switches is switched to allow the power circuit to provide the current or voltage to the compensation capacitor. When the main circuit is in the output state, the set of switches is switched to disconnect the power circuit from the compensation capacitor and allow the main circuit to return to an output circuit state and operate normally.
    Type: Application
    Filed: August 30, 2013
    Publication date: October 16, 2014
    Applicant: Novatek Microelectronics Corp.
    Inventors: Pei-Ye Wang, Ji-Ting Chen
  • Publication number: 20140306770
    Abstract: A signal-processing system has an amplifier that generates an amplified (RF) output signal based on an (RF) input signal. The amplifier receives a supply voltage that can be selectively set to an appropriate level between a lower power supply level and a higher power supply level. With one power supply permanently connected to the supply voltage node, a control unit executes software to toggle a supply switch to periodically connect and disconnect the other power supply thereby generating a weighted average value for the supply voltage between the two power supply levels. When a sudden and large increase occurs in the (input) power level, hardware-interrupt circuitry interrupts and supersedes the software-based control of the supply-voltage switch to quickly switch the supply voltage towards the higher power supply level. The hardware-interrupt circuitry handles such situations faster than the software-based control in order to prevent a limit violation of spectrum emission requirements.
    Type: Application
    Filed: November 22, 2011
    Publication date: October 16, 2014
    Applicant: ANDREW WIRELESS SYSTEMS GMBH
    Inventor: Udo-Michael Vetter
  • Patent number: 8856857
    Abstract: This technique relates to a receiving device, a receiving method, and a program that can demodulate transmitted signals with high accuracy. A receiving device of this disclosure includes: an amplifying unit that amplifies a received signal; an adjusting unit that adjusts gain of the amplifying unit in accordance with power of the signal; a demodulating unit that demodulates the amplified signal; and a detecting unit that detects an interval from the signal, information having the same content continuously appearing in the interval. The adjusting unit restricts the process of adjusting the gain of the amplifying unit in accordance with a result of the detection of the interval. This disclosure can be applied to receiving devices that receive broadcast signals compliant with DVB-C2 via a CATV network.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: October 7, 2014
    Assignee: Sony Corporation
    Inventors: Kenichi Kobayashi, Naoki Yoshimochi
  • Patent number: 8854129
    Abstract: 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: Grant
    Filed: April 12, 2011
    Date of Patent: October 7, 2014
    Assignee: Nujira Limited
    Inventor: Martin Paul Wilson
  • Patent number: 8854128
    Abstract: Signal timing adjustment in an amplifying device is appropriately performed by phase adjustment by a digital filter. The amplifying device includes an amplifier; an amplitude-voltage converting unit 12 that performs a desired process on a signal relating to operation of the amplifier, whereby the signal is band-broadened; and a timing adjusting unit 15a that performs timing adjustment of the signal to be provided to the amplifier, by phase adjustment by a digital filter. The timing adjusting unit 15a performs the timing adjustment of the signal at a stage before the signal is band-broadened by the amplitude-voltage converting unit 12.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: October 7, 2014
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Masahiko Onishi
  • Publication number: 20140285269
    Abstract: A radio frequency amplification stage comprising: an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, comprising: means for providing a reference signal representing the envelope of the input signal; means for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and means for generating an adjusted selected power supply voltage, comprising an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage.
    Type: Application
    Filed: June 9, 2014
    Publication date: September 25, 2014
    Applicant: NUJIRA LIMITED
    Inventor: Martin Paul Wilson
  • Publication number: 20140266468
    Abstract: A tracking power supply for one or more amplifiers includes one or more cascaded sets of power boost circuits to temporarily boost the positive and/or negative power supply rail, respectively. Each power boost circuit may include a gain element and an energy source such as a capacitor or battery, and the power boost circuits are linked to provide a greater degree of voltage boost when needed. An optional control circuit monitors amplifier output signal levels, or separately amplified input signal levels, and provides power boost control signals to the power boost circuits, which temporarily raise or lower the positive and/or negative supply voltages above or below the nominal voltage rails in tandem with the highest and lowest output signals, respectively, from the amplifier(s).
    Type: Application
    Filed: March 12, 2013
    Publication date: September 18, 2014
    Inventors: Owen Jones, Lawrence R. Fincham
  • Publication number: 20140240051
    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: Application
    Filed: May 2, 2014
    Publication date: August 28, 2014
    Applicant: Crestron Electronics, Inc.
    Inventor: Robert Buono
  • Publication number: 20140240050
    Abstract: A power circuit includes a bridge circuit connected to a first node by which an output voltage is supplied to a load circuit including an amplifier containing a CMOS inverter, and configured to generate a current flowing in a first current channel and a current flowing in a second current channel in accordance with a voltage difference between the output voltage and a predetermined set voltage to be supplied to the load circuit, and a current amplifier configured to generate a current flowing in a third current channel to the load circuit in accordance with an input source voltage and a difference between the current flowing in the first current channel and the current flowing in the second current channel. The predetermined set voltage that is supplied to the load circuit achieves the smallest transconductance during normal operation of the amplifier.
    Type: Application
    Filed: February 5, 2014
    Publication date: August 28, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Kan SHIMIZU
  • Patent number: 8816768
    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: Grant
    Filed: September 12, 2012
    Date of Patent: August 26, 2014
    Assignee: Mediatek Inc.
    Inventors: Chun-Yen Tseng, Yen-Hsun Hsu
  • Publication number: 20140232470
    Abstract: A radio frequency amplification stage comprising: an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, comprising: means for providing a reference signal representing the envelope of the input signal; means for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and means for generating an adjusted selected power supply voltage, comprising an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage.
    Type: Application
    Filed: April 29, 2014
    Publication date: August 21, 2014
    Applicant: NUJIRA LIMITED
    Inventor: Martin Paul Wilson
  • Publication number: 20140225674
    Abstract: Circuitry, which includes a linear amplifier, is disclosed. The linear amplifier has a linear amplifier output and includes an input amplifier stage and an output amplifier stage. The output amplifier stage at least partially provides an envelope power supply voltage to a radio frequency (RF) power amplifier (PA) via an envelope power supply output using a selected one of a group of linear amplifier power supply signals. The group of linear amplifier power supply signals includes at least a first bi-directional power supply signal. The input amplifier stage selects the one of the group of linear amplifier power supply signals based on the envelope power supply voltage and a setpoint of the envelope power supply voltage.
    Type: Application
    Filed: February 10, 2014
    Publication date: August 14, 2014
    Applicant: RF Micro Devices, Inc.
    Inventors: Andrew F. Folkmann, Nadim Khlat, Michael R. Kay
  • Patent number: 8803606
    Abstract: An apparatus for amplifying power is provided. The apparatus includes a supply modulator for generating a supply voltage based on an amplitude component of a transmission signal, and a power amplify module for amplifying power of the transmission signal using the supply voltage, wherein the power amplify module includes a first power amplifier and a second power amplifier, and when an output power of the transmission signal is greater than a reference power, the first power amplifier amplifies the power of the transmission signal using the supply voltage, and when the output power of the transmission signal is equal to or less than the reference power, the second power amplifier amplifies the power of the transmission signal using the supply voltage.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: August 12, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyung-Sun Lim, Hee-Sang Noh, Young-Eil Kim, Bok-Ju Park, Sang-Hyun Baek, Ji-Seon Paek, Jun-Seok Yang
  • Patent number: 8803605
    Abstract: An integrated circuit is described for providing a power supply to a radio frequency (RF) power amplifier (PA). The integrated circuit includes a low-frequency power supply path including a switching regulator and a high-frequency power supply path arranged to regulate an output voltage of a combined power supply at an output port of the integrated circuit for coupling to a load. The combined power supply is provided by the low-frequency power supply path and high-frequency power supply path. The high-frequency power supply path includes: an amplifier including a voltage feedback and arranged to drive a power supply signal on the high-frequency power supply path; and a capacitor operably coupled to the output of the amplifier and arranged to perform dc level shifting of the power supply signal.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: August 12, 2014
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Paul Fowers, Patrick Stanley Riehl
  • Publication number: 20140218117
    Abstract: The present invention relates to a voltage regulating device comprising a power stage (30) comprising an inductor (L) between a first node (P1) and a second node (P2); a first switch (A) between the first node (Pi) and a power supply node (P3) for which the potential (Vbat) is non-zero and of constant polarity; a first capacitor (CNEG) between a node (P5) at a reference potential and a second switch (B) coupled to the first node (P1); a second capacitor (CPOS) between a node (P7) at the reference potential and a third switch (C) coupled to the second node (P2); a fourth switch (D) between the second node (P2) and a node (P8) at the reference potential; a fifth switch (E) between the first node (P1 and a node (P9) at the reference potential; a first output (P4) for delivering a first voltage corresponding to the voltage at the terminals of the first capacitor (CNEG); a second output (P6) for delivering a second voltage corresponding to the voltage at the terminals of the second capacitor (CPOS); The power stag
    Type: Application
    Filed: August 14, 2012
    Publication date: August 7, 2014
    Inventors: Xavier Branca, David Chesneau
  • Patent number: 8797113
    Abstract: A power amplifier comprises: polar modulator that receives modulated signal including amplitude-modulated component and phase-modulated component, outputs the amplitude-modulated component, superimposes the modulated signal on carrier wave to generate signal output as RF-modulated signal, and delays at least one of the amplitude-modulated component and the RF-modulated signal; first amplitude modulator that receives the amplitude-modulated component, pulse-modulates the amplitude-modulated component to generate signal output as pulse-modulated signal, and amplifies the amplitude-modulated component with the amplitude-modulated component and the pulse-modulated signal as control signals; second amplitude modulator that receives the amplitude-modulated component and the pulse-modulated signal, and amplifies the amplitude-modulated component with the amplitude-modulated component and the pulse-modulated signal as control signals; and first RF amplifier that receives the RF-modulated signal, amplifies the RF-modu
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: August 5, 2014
    Assignee: NEC Corporation
    Inventor: Shingo Yamanouchi
  • Publication number: 20140210559
    Abstract: 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: Application
    Filed: January 28, 2013
    Publication date: July 31, 2014
    Applicant: QUALCOMM INCORPORATED
    Inventors: Lennart Karl-Axel Mathe, Pengfei Li, Song S. Shi, Yunfei Shi, Joseph D. Rutkowski
  • Patent number: 8791760
    Abstract: This disclosure relates to radio frequency (RF) amplification devices and methods for amplifying an RF input signal. To set the quiescent operating level of the RF output signal, a bias signal to be applied to the RF input signal is received prior to amplifying the RF input signal. The bias signal is amplified to generate the RF output signal at the quiescent operating level and a feedback signal is received that is indicative of the quiescent operating level of the RF output signal. Prior to amplifying the RF input signal, the bias signal level of the bias signal is adjusted such that the quiescent operating level is set to a reference signal level based on the feedback signal level. This allows for adjustments to be made to the quiescent operating level and maintain the quiescent operating level at a desired value.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: July 29, 2014
    Assignee: RF Micro Devices, Inc.
    Inventors: Praveen Varma Nadimpalli, Mike Landherr, Michael B. Thomas, Wonseok Oh
  • Publication number: 20140203878
    Abstract: Apparatus and methods for reducing capacitive loading of a power amplifier supply control module are disclosed. In one embodiment, a method of power supply control in a power amplifier system includes controlling a voltage level of a supply voltage using a supply control module, amplifying a first radio frequency (RF) signal using a first power amplifier module, amplifying a second RF signal using a second power amplifier module, delivering the supply voltage to a first supply input of the first power amplifier module through a first resonant circuit, and delivering the supply voltage to a second supply input of the second power amplifier module through a second resonant circuit. The first resonant circuit includes a first inductor and a first capacitor electrically connected in parallel, and the second resonant circuit includes a second inductor and a second capacitor electrically connected in parallel.
    Type: Application
    Filed: March 21, 2014
    Publication date: July 24, 2014
    Applicant: SKYWORKS SOLUTIONS, INC.
    Inventors: Russ Alan Reisner, Daniel Lee Kaczman, Yu-Jui Lin, Andy Cheng Pang Wu
  • Patent number: 8786371
    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: Grant
    Filed: November 7, 2012
    Date of Patent: July 22, 2014
    Assignees: Skyworks Solutions, Inc., Nujira Ltd
    Inventors: Peter Harris Robert Popplewell, Jakub F Pingot, Florinel G Balteanu, Martin Wilson, Mark Tuckwell
  • Patent number: 8786370
    Abstract: A power supply control circuit includes a mode controlling unit which, in accordance with an output voltage of an amplifying section, performs a mode up for switching a current power supply voltage of the amplifying section to a higher power supply voltage being higher than the current power supply voltage, and which, in a case where a magnitude of the output voltage of the amplifying section is smaller than a threshold voltage for a predetermined time period or longer, performs a mode down for switching the power supply voltage of the amplifying section to a lower power supply voltage being lower than the current power supply voltage, and a threshold setting unit which sets the threshold voltage based on the output voltage of the amplifying section at a timing when the mode up is performed.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: July 22, 2014
    Assignee: Yamaha Corporation
    Inventors: Hideyo Haruhana, Takayuki Yoshida, Hidekazu Ono, Tatsuya Kishii
  • Patent number: 8786373
    Abstract: Techniques for bypassing a supply voltage for an amplifier are disclosed. In an exemplary design, an apparatus includes an amplifier and an adjustable bypass circuit. The amplifier (e.g., a power amplifier) receives a supply voltage from a supply source. The adjustable bypass circuit is coupled to the supply source and provides bypassing for the supply voltage. The adjustable bypass circuit includes an adjustable capacitor or a fixed capacitor coupled to an adjustable resistor. The supply source may be (i) a power supply source providing a fixed supply voltage for the amplifier or (ii) an envelope tracker providing a variable supply voltage for the amplifier.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: July 22, 2014
    Inventors: Calogero D. Presti, Jose Cabanillas
  • Patent number: 8779853
    Abstract: An amplifier is disclosed. In accordance with some embodiments of the present disclosure, an amplifier may comprise a differential pair comprising a first transistor and a second transistor, wherein the first transistor comprises a first portion and a second portion, a first compensation circuit comprising a first terminal coupled to the first portion of the first transistor and a second terminal coupled to the second transistor, and a second compensation circuit comprising a first terminal coupled to the second portion of the first transistor and a second terminal coupled to the second transistor and the second terminal of the first compensation circuit.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: July 15, 2014
    Assignee: Intel IP Corporation
    Inventors: Kai Zhong, John Yu