Control Of Bias On Separate Gain Control Electrode Patents (Class 330/131)
  • Patent number: 10355653
    Abstract: A power amplifier circuit includes a first amplifier transistor, an input signal being supplied to a base of the first amplifier transistor, a first amplification signal obtained by amplifying the input signal being output from a collector of the first amplifier transistor; a first bias circuit that supplies a first current or a first voltage to the base of the first amplifier transistor; a second bias circuit that supplies a second current or a second voltage to the base of the first amplifier transistor; and a first resistor element that is connected in series between the base of the first amplifier transistor and the first bias circuit. The second bias circuit includes a diode, an impedance circuit, and a first capacitor element.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: July 16, 2019
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventor: Hideyuki Sato
  • Patent number: 10164578
    Abstract: Embodiments of the disclosure relate to a frequency selective low noise amplifier (LNA) circuit, which includes a transconductive LNA(s). In one aspect, filter circuitry is provided in a degeneration path of a transconductive LNA(s) to pass in-band frequencies and reject out-of-band frequencies by generating low impedance and high impedance at the in-band frequencies and the out-of-band frequencies, respectively. However, having the filter circuitry in the degeneration path may cause instability in the transconductive LNA. As such, a feedback path is coupled between an input node of the transconductive LNA(s) and the degeneration path to provide a feedback to improve stability of the transconductive LNA(s). In addition, the feedback can help improve impedance match in the frequency selective LNA circuit. As a result, the transconductive LNA(s) is able to achieve improved noise figure (NF) (e.g., below 1.5 dB), return loss, linearity, and stability, without compromising LNA gain.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: December 25, 2018
    Assignee: Qorvo US, Inc.
    Inventors: Marcus Granger-Jones, Nadim Khlat, George Maxim
  • Patent number: 9629092
    Abstract: Provided is a method and device for reducing the power consumption of a mobile terminal. The method for reducing the power consumption of the mobile terminal includes the following steps: the current transmitting power of the mobile terminal and the current gain switching point of a power amplifier are obtained; when the difference between the obtained current transmitting power and the current gain switching point is less than a preset gain difference, the current gain switching point of the mobile terminal is increased by a first preset value.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: April 18, 2017
    Assignee: ZTE CORPORATION
    Inventor: Haibing Jin
  • Patent number: 9584894
    Abstract: The invention concerns an antenna system of a radio microphone that includes an antenna path starting at an in port and ending at an out port along with an amplifier and a radio frequency (RF) cable. In order to compensate for various cable attenuations, an attenuator is provided in series with a variable slope compensator between the amplifier and the RF cable. In order to avoid a negative effect on a large signal behavior of variable slope compensators, field effect transistors (FETs) or pin diodes are used for switching of the resistances so that a large signal behavior is achieved.
    Type: Grant
    Filed: November 28, 2014
    Date of Patent: February 28, 2017
    Assignee: AKG Acoustics GmbH
    Inventor: Heinrich Kofler
  • Patent number: 9019011
    Abstract: A method for power amplifier (PA) calibration for an envelope tracking system of a wireless device is disclosed. The method involves measuring an output power of a PA that is a part under test (PUT) at a predetermined input power. Another step includes calculating a gain equal to the output power of the PA divided by the predetermined input power. A next step involves calculating a gain correction by subtracting the calculated gain from a desired gain. Other steps include determining an expected supply voltage for the PA at the desired gain using the gain correction applied to a nominal curve of gain versus PA supply voltage, and then storing the expected supply voltage for the PA versus input power in memory.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: April 28, 2015
    Assignee: RF Micro Devices, Inc.
    Inventors: Alexander Wayne Hietala, Nadim Khlat
  • Patent number: 8989682
    Abstract: Apparatus and methods for envelope tracking calibration are provided. In one embodiment, a method of calibrating an envelope tracker having an envelope shaping table generated at a desired gain compression of a power amplifier is provided. The method includes generating a supply voltage for the power amplifier using the envelope tracker, operating the supply voltage of the power amplifier at a first voltage level associated with substantially no gain compression of the power amplifier, and measuring an output power of the power amplifier at the first voltage level. The method further includes decreasing a voltage level of the supply voltage one or more times and measuring the output power at each voltage level, determining a second voltage level of the power amplifier associated with a gain compression equal to about that of the desired gain compression, and calibrating the envelope tracker based on the determination.
    Type: Grant
    Filed: February 6, 2012
    Date of Patent: March 24, 2015
    Assignees: Skyworks Solutions, Inc., Nujira Ltd.
    Inventors: David Steven Ripley, Sabah Khesbak, Benjamin Bartram, Kevin Lee Cobley, Robert Astle Henshaw, Julian Hildersley, Robert John Thompson
  • Patent number: 8866549
    Abstract: The exemplary embodiments include methods, computer readable media, and devices for calibrating a non-linear power detector of a radio frequency device based upon measurements of the non-linear power detector output and the associated power amplifier output level, and a set of data points that characterize a nominal non-linear power detector. The set of data points that characterize the nominal non-linear power detector is stored in a calibration system memory as nominal power detector output data. The measured non-linear power detector outputs, power amplifier output levels, and the nominal power detector output data is used to determine a power detector error function that characterizes the difference between the response of the non-linear power detector and the nominal non-linear power detector. The power detector error function and the nominal power detector output data are used to develop a calibrated power detector output data set that is stored in the non-linear power detector.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: October 21, 2014
    Assignee: RF Micro Devices, Inc.
    Inventors: Alexander Wayne Hietala, Timothy E. Daughters
  • Patent number: 8860524
    Abstract: A polar modulator of the present invention includes: a first function block which generates an amplitude signal and a phase signal; a second function block which adjusts the signal delay between the amplitude signal and the phase signal; a third function block which allows the low frequency component of the amplitude signal to pass therethrough; a fourth function block which modulates the phase of the phase signal; a fifth function block which outputs a modulation voltage, based on the amplitude signal; a sixth function block which modulates the amplitude of the phase signal, based on the modulation voltage; a seventh function block which measures the temperature of at least one function block; and an eighth function block which calculates a compensation amount for the signal delay, based on the measured temperature. The second function block adjusts the signal delay, based on the compensation amount.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: October 14, 2014
    Assignee: Panasonic Corporation
    Inventors: Shigeru Morimoto, Kaoru Ishida, Maki Nakamura
  • Publication number: 20140210550
    Abstract: Techniques for preventing reverse current in applications wherein a tracking supply voltage is placed in parallel with a switching power stage. The tracking supply voltage may be boosted to a level higher than a battery supply voltage using, e.g., a boost converter. In an aspect, a negative current detection block is provided to detect negative current flow from the boosted tracking supply voltage to the battery supply voltage. A high-side switch of the switching power stage may be disabled in response to detecting the negative current. To prevent false tripping, the tracking supply voltage may be further compared with the battery supply voltage, and a latch may be provided to further control the high-side switch.
    Type: Application
    Filed: January 28, 2013
    Publication date: July 31, 2014
    Applicant: QUALCOMM Incorporated
    Inventors: Lennart Karl-Axel Mathe, Joseph D. Rutkowski, Song S. Shi
  • 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: 8737940
    Abstract: A method for calibrating a supply voltage of an envelope tracking PA (power amplifier) is provided. The method includes obtaining a plurality of calibrated PA supply voltage values using a PA output power sequence having a plurality of different PA output power values. Thereby, an order of the PA output power values of the PA output power sequence is chosen such that a junction temperature of the PA is maintained during calibration within a temperature range that occurs during non-calibration envelope tracking operation.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: May 27, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Andreas Langer, Gunther Kraut, Berndt Pilgram
  • Publication number: 20140015604
    Abstract: An amplifier circuit includes a gain controller, a first amplifier, and a second amplifier which is coupled in series to the first amplifier, the second amplifier comprising a plurality of amplifying units.
    Type: Application
    Filed: July 16, 2012
    Publication date: January 16, 2014
    Applicant: Intel Mobile Communications GmbH
    Inventors: Gerald Eschlboeck, Christian Mayer, Andreas Schwarz, Hans Henningsen, Konrad Hirsch
  • Publication number: 20130328626
    Abstract: The problem to be solved is to alleviate the distortion characteristic of an amplifier and to prevent the drop in gain with respect to a low-level high-frequency signal. A bias control circuit (10) for controlling the bias of an amplifier (20) which amplifies a high-frequency signal is provided herein with a detector (11) for detecting the envelope of the high-frequency signal, a first bias circuit (12) for supplying a constant bias current to the amplifier (20) and a second bias circuit (14) for supplying a bias current that varies with the variation of the level of the envelope of the high-frequency signal to the amplifier.
    Type: Application
    Filed: January 17, 2012
    Publication date: December 12, 2013
    Applicant: TDK CORPORATION
    Inventors: Tomohiko Shibuya, Atsushi Ajioka, Atsushi Tsumita
  • Publication number: 20130303101
    Abstract: Disclosed herein is a gain control circuit including: an amplifying section configured to amplify an input voltage in such a manner that amplitude of an output voltage at an output terminal is kept constant; an allowable voltage acquirer configured to acquire an allowable voltage of an apparatus connected to the output terminal; a voltage divider configured to divide the output voltage according to a ratio between a maximum voltage of the amplified input voltage and the allowable voltage; and an adjusting section configured to further amplify the amplified input voltage according to the ratio and supply a resulting voltage to the output terminal.
    Type: Application
    Filed: May 2, 2013
    Publication date: November 14, 2013
    Applicant: SONY CORPORATION
    Inventors: Yusuke Yoneyama, Noboru Sasho, Takeo Tokunaga
  • Publication number: 20130099861
    Abstract: A method and an apparatus for controlling a transmit signal of a radio frequency power amplifier are provided. The method includes: adjusting a power supply voltage of the power amplifier to an efficiency point power supply voltage under designated transmit power; querying correspondence between an input voltage and transmit power at each power level under the efficiency point power supply voltage; and adjusting, according to the correspondence, an input voltage to an input voltage corresponding to the designated transmit power. The embodiments of the present invention, the power amplifier is enabled to work at an optimum efficiency point while the transmit power of the power amplifier is under control, which improves efficiency of the power amplifier.
    Type: Application
    Filed: December 10, 2012
    Publication date: April 25, 2013
    Applicant: Huawei Device Co., Ltd.
    Inventor: Huawei Device Co., Ltd.
  • Patent number: 8416019
    Abstract: A digitally-controlled analog gain circuit supports a plurality of gain settings in which gain changes are made from a first setting to a new setting in response to a clocking signal. Large changes in gain are interpolated in small gain steps or increments. The clocking signal can be generated by an oscillator, or as a sequence of pulses output by a zero crossing detector. The gain circuit can apply positive gain to the signal. Alternatively, the gain circuit can apply a negative gain (attenuation) to the signal. The clocking signal can be provided in a pseudo-randomized manner to minimize unwanted signal effects such as discernable sound transients.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: April 9, 2013
    Assignee: THAT Corporation
    Inventors: Robert W. Moses, Leslie B. Tyler, Christopher Hanna
  • Publication number: 20120326782
    Abstract: In an automatic gain control circuit, a peak detection circuit detects and outputs the peak voltage of an output signal from a variable gain circuit. An average value detection/output amplitude setting circuit detects the average value voltage of an output signal from the variable gain circuit, and outputs a calculated voltage. An amplification circuit controls the gain of the variable gain circuit by amplifying the difference between the output voltages of the peak detection circuit and average value detection/output amplitude setting circuit. The number of base-emitter junctions of transistors on a path in the peak detection circuit from input ports which receive output signals from the variable gain circuit to an output port which outputs a voltage to the amplification circuit is equal to the number of base-emitter junctions of transistors on a path in the average value detection/output amplitude setting circuit.
    Type: Application
    Filed: June 19, 2012
    Publication date: December 27, 2012
    Inventors: Kimikazu Sano, Hiroyuki Fukuyama, Hideyuki Nosaka, Makoto Nakamura, Koichi Murata, Masatoshi Tobayashi, Yasunobu Inabe, Eisuke Tsuchiya
  • Publication number: 20120313702
    Abstract: A drain modulator circuit for operation with a radio frequency (RF) amplifier, includes a pair of AC signal sources each of the AC signal sources having an output at which an AC signal is provided. The drain modulator circuit further includes a pair of tapped delay elements, each of which is configured to receive an AC signal from a respective one of the AC signal sources and a control element coupled to provide one or more control signals to the pair of tapped delay elements such that the tapped delay elements provide a selected instantaneous differential voltage to the RF amplifier.
    Type: Application
    Filed: June 9, 2012
    Publication date: December 13, 2012
    Applicant: Auriga Measurement Systems, LLC
    Inventor: Steven A. Mulawski
  • Publication number: 20120306572
    Abstract: A method for power amplifier (PA) calibration for an envelope tracking system of a wireless device is disclosed. The method involves measuring an output power of a PA that is a part under test (PUT) at a predetermined input power. Another step includes calculating a gain equal to the output power of the PA divided by the predetermined input power. A next step involves calculating a gain correction by subtracting the calculated gain from a desired gain. Other steps include determining an expected supply voltage for the PA at the desired gain using the gain correction applied to a nominal curve of gain versus PA supply voltage, and then storing the expected supply voltage for the PA versus input power in memory.
    Type: Application
    Filed: June 1, 2012
    Publication date: December 6, 2012
    Applicant: RF MICRO DEVICES, INC.
    Inventors: Alexander Wayne Hietala, Nadim Khlat
  • Publication number: 20120293255
    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: Application
    Filed: March 15, 2012
    Publication date: November 22, 2012
    Applicant: FUJITSU LIMITED
    Inventor: Tsuneaki TADANO
  • Publication number: 20120249240
    Abstract: An apparatus for implementing a front end circuit for a transimpedance amplifier includes a front end core that receives an input signal from a photo diode. The front end core responsively generates a balanced output signal to downstream devices. A power supply provides a supply voltage to the front end circuit. In accordance with the present invention, a current source is located between the supply voltage the front end core to thereby isolate the front end core from disturbances on the power supply. This biasing arrangement advantageously provides an improved power supply rejection ratio for the front end circuit.
    Type: Application
    Filed: May 19, 2011
    Publication date: October 4, 2012
    Inventor: Jeremy Chatwin
  • Publication number: 20120200354
    Abstract: Apparatus and methods for envelope tracking calibration are provided. In one embodiment, a method of calibrating an envelope tracker having an envelope shaping table generated at a desired gain compression of a power amplifier is provided. The method includes generating a supply voltage for the power amplifier using the envelope tracker, operating the supply voltage of the power amplifier at a first voltage level associated with substantially no gain compression of the power amplifier, and measuring an output power of the power amplifier at the first voltage level. The method further includes decreasing a voltage level of the supply voltage one or more times and measuring the output power at each voltage level, determining a second voltage level of the power amplifier associated with a gain compression equal to about that of the desired gain compression, and calibrating the envelope tracker based on the determination.
    Type: Application
    Filed: February 6, 2012
    Publication date: August 9, 2012
    Applicants: NUJIRA LTD, SKYWORKS SOLUTIONS, INC.
    Inventors: David Steven Ripley, Sabah Khesbak, Benjamin Bartram, Kevin Lee Cobley, Robert Astle Henshaw, Julian Hildersley, Robert John Thompson
  • Patent number: 8229382
    Abstract: A switched current resistor (SCR) PGA for constant-bandwidth gain control includes an inverting amplifier, a feedback resistor forming a feedback loop between an output side and an input side of the inverting amplifier, and a switched current resistor (SCR) array connected in parallel to the feedback resistor, and configured to tune a gain range between a maximum and a minimum. The SCR array includes a plurality of switched resistors, each comprising a switch in series with a resistor. When the plurality of switched resistors are switched by a gain-control logic, a plurality of switched current sources and a plurality of grounded resistors are switched correspondingly to deliver a transient current, an equivalent of which flows through the plurality of grounded resistors out from the input side of the inverting amplifier, leading to a feedback factor of the PGA being constant.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: July 24, 2012
    Assignee: University of Macau
    Inventors: Pui-In Mak, Seng-Pan U, Rui P. Martins
  • Publication number: 20120133432
    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: Application
    Filed: November 25, 2011
    Publication date: May 31, 2012
    Inventor: Robert Gehrke
  • Publication number: 20120105151
    Abstract: Provided is a transmission circuit capable of compensating a variation in output power caused due to a temperature change or an individual variability when the operation mode is switched without an increase in the size of the transmission circuit which switches the operation mode between a linear operation mode and a nonlinear operation mode, and capable of suppressing the deterioration of the quality of a transmission signal. In the transmission circuit, a gain setting section (160) sets the gain (target gain) of a variable gain amplifier (140), to a value which enables the variable gain amplifier (140) to operate linearly and corresponds to a comparison result (output error level) obtained through comparison between the target level of the variable gain amplifier (140) corresponding to the set power level of the transmission signal and the power level of an output signal of the variable gain amplifier (140) detected by a power detection section (150).
    Type: Application
    Filed: May 13, 2011
    Publication date: May 3, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Maki Nakamura, Kaoru Ishida
  • Publication number: 20120094727
    Abstract: Provided is a power amplification circuit capable of quickly and highly accurately preventing an output power and a current of a power amplifier from fluctuating when an antenna load changes. A power amplifier 11 amplifies a radio frequency signal and obtains an output signal. A regulator 12 amplifies an input voltage by a predetermined gain and supplies an output voltage to the power amplifier 11. A current monitor 13 monitors an input current to the regulator 12 and obtains a monitor current. A first multiplier 14 multiplies the monitor current by the output voltage of the regulator 12 and obtains a monitor power. A memory 16 prestores a predetermined reference current. A second multiplier 15 multiplies the input voltage by the reference current and obtains a reference power. A gain control section 121 in the regulator 12 controls a predetermined gain based on the monitor power and the reference power.
    Type: Application
    Filed: October 8, 2010
    Publication date: April 19, 2012
    Inventors: Shigeru Morimoto, Kenichi Mori, Iwao Kojima, Kazuaki Takahashi, Mikihiro Shimada
  • Publication number: 20110156813
    Abstract: There is provided a power amplifier that can maintain a constant gain by detecting a level of a signal being input and a level of a signal being output. A power amplifier according to an aspect of the invention may include: an amplification section having at least one amplification unit amplifying an input signal according to an adjustable gain to thereby output the amplified input signal; a detection section detecting signal levels of an input signal and an output signal of the amplification section; and a gain maintaining section controlling a bias power according to a detection result of the detection section so that a gain of the amplification section is maintained within a predetermined gain range.
    Type: Application
    Filed: September 16, 2010
    Publication date: June 30, 2011
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Yoo Hwan KIM, Yoo Sam NA, Byeong Hak JO, Hyun Hwan YOO
  • Publication number: 20110090008
    Abstract: Disclosed is a power amplifier apparatus including: an amplifier amplifying an input modulated signal; a control signal generator receiving an amplitude component of the input modulated signal and generating a control signal; and a power combiner performing ON/OFF control of a switching element based on the control signal to control conduction and non-conduction of a current supplied from a second power supply. In the power combiner, a power of a pulsed form when the current from the second power supply is conductive is transferred in a direction of a first power supply, using a transformer. A difference power obtained by subtracting a constant value from a first power supply voltage when the amplitude of the input modulated signal is smaller than that of a reference signal is supplied from the power combiner to the amplifier, as a power supply thereof (FIG. 1).
    Type: Application
    Filed: June 25, 2009
    Publication date: April 21, 2011
    Inventor: Kazuaki Kunihiro
  • Publication number: 20110084760
    Abstract: A highly efficient class-G amplifier includes an amplifier circuit coupled between a positive power rail and a negative power rail to amplify an audio input signal of the class-G amplifier, and a boost inverting power converter to convert a supply voltage to a positive rail voltage and a negative rail voltage on the positive and negative power rails. The boost inverting power converter includes a boost inverting power stage coupled to the positive and negative power rails, and a controller to switch the boost inverting power stage between a boost mode and an inverting mode. An audio level detector detects the audio input signal for the controller to adjust the positive and negative rail voltages. The class-G amplifier has higher efficiency and requires lower cost because it does not need a charge pump.
    Type: Application
    Filed: October 6, 2010
    Publication date: April 14, 2011
    Applicant: RICHTEK TECHNOLOGY CORP.
    Inventors: JWIN-YEN GUO, TSUNG-NAN WU
  • Publication number: 20110068867
    Abstract: A digitally-controlled analog gain circuit supports a plurality of gain settings in which gain changes are made from a first setting to a new setting in response to a clocking signal. Large changes in gain are interpolated in small gain steps or increments. The clocking signal can be generated by an oscillator, or as a sequence of pulses output by a zero crossing detector. The gain circuit can apply positive gain to the signal. Alternatively, the gain circuit can apply a negative gain (attenuation) to the signal. The clocking signal can be provided in a pseudo-randomized manner to minimize unwanted signal effects such as discernable sound transients.
    Type: Application
    Filed: August 16, 2010
    Publication date: March 24, 2011
    Applicant: THAT CORPORATION
    Inventors: Robert W. Moses, Leslie B. Tyler, Christoper Hanna
  • Publication number: 20110043282
    Abstract: A power amplifier controller circuit controls an adjustable impedance matching network at the output of a power amplifier to vary its load line to improve the efficiency of the RF PA. The PA controller circuit comprises an amplitude control loop that determines an amplitude correction signal. The amplitude loop is configured to control or correct for distortion from the adjustable matching network based upon the amplitude correction signal.
    Type: Application
    Filed: August 20, 2010
    Publication date: February 24, 2011
    Applicant: QUANTANCE, INC.
    Inventors: Serge Francois Drogi, Vikas Vinayak
  • Publication number: 20100321108
    Abstract: An apparatus and method for controlling a high power amplifier in a communication system are provided. The apparatus includes a Radio Frequency (RF) power detection unit for detecting an intensity of an RF input signal, a high power amplifier controller for determining a control signal, which indicates a voltage value of a drain bias to be provided to at least one drain node from among drain nodes of a drive amplifier and a main amplifier included in the high power amplifier, according to the detected intensity, a Direct Current (DC) voltage supplying unit for generating a DC voltage corresponding to the determined control signal, a drain bias connection unit for providing the generated DC voltage to said at least one drain node from among the drain nodes of the drive amplifier and the main amplifier, and the drive amplifier and the main amplifier for amplifying the RF input signal according to the provided DC voltage.
    Type: Application
    Filed: June 21, 2010
    Publication date: December 23, 2010
    Applicant: SAMSUNG ELECTRONICS CO. LTD.
    Inventors: Jong-Hyun LEE, Dong-Geun LEE
  • Publication number: 20100308909
    Abstract: Techniques for optimizing the power consumption of existing low cost multi-gain state power amplifiers (PA) to increase the talk time of wireless communication devices are described. In an exemplary embodiment a device, such as a baseband processor, operates to set a multistage PA having at least two gain states for amplifying a transmit signal to a lowest power consuming gain state. The device calculates a transition power level as a function of an identified maximum power reduction (MPR) value and switches the PA to a higher gain state from a lower gain state when a transmission power level is higher than the calculated transition power level.
    Type: Application
    Filed: December 4, 2009
    Publication date: December 9, 2010
    Applicant: QUALCOMM Incorporated
    Inventors: Sumit Verma, Vijay K. Chellappa, Gurkanwal S. Sahota
  • Publication number: 20100267351
    Abstract: A receiver capable of performing optimum automatic gain control responsive to a peak factor of an input signal before subjected to A/D conversion is provided in a simple configuration. A peak detector 104 is placed at the later stage of a variable gain amplifier 102, two power determiners 107 and 108 different in threshold value are used, and the amplitude density is determined in three areas separated by two threshold values PDETL and PDETH, whereby it is made possible to identify the input signal having a peak factor different in modulation system and perform optimum gain control without A/D conversion of the input signal.
    Type: Application
    Filed: December 16, 2008
    Publication date: October 21, 2010
    Applicant: PANASONIC CORPORATION
    Inventor: Noriaki Saito
  • Publication number: 20100109770
    Abstract: A reconfigurable power amplifier includes at least one amplification circuit (E1, E2), and a circuit (6) for controlling the amplification circuit so as to adapt its operation according to an applied input signal (RFin). The circuit for controlling includes a circuit (4, 5) for modifying the compression point of the amplification circuit and for adapting the gain of the amplification circuit in such a manner as to increase the power added efficiency of the circuit for the modified compression point.
    Type: Application
    Filed: January 14, 2008
    Publication date: May 6, 2010
    Applicants: STMicroelectronics S.A., Centre National de la Recherche Scientifique
    Inventors: Didier Belot, Yann Deval, Eric Kerherve, Nathalie Deltimple, Pierre Jarry
  • Publication number: 20090081968
    Abstract: A power amplifier controller controls a power amplifier and is coupled to a polar modulator. The polar modulator generates an amplitude component and a phase-modulated component of the desired RF modulated signal, and outputs to the power amplifier controller. The power amplifier controller regenerates a combined phase and amplitude modulated RF signal to generate an input signal to a power amplifier by adjusting the gain of a VGA based on the amplitude component of the desired RF modulated signal. Concurrently, the power amplifier controller both controls an adjusted supply voltage to the PA and adjusts the gain of the VGA based upon an amplitude correction signal or amplitude error signal.
    Type: Application
    Filed: September 20, 2007
    Publication date: March 26, 2009
    Inventors: Vikas Vinayak, Serge Francois Drogi, Martin Tomasz
  • Publication number: 20080186094
    Abstract: An apparatus for a High Power Amplifier (HPA) in a wireless communication system is provided. In one example, the apparatus includes a temperature sensor for determining temperature, a controller for receiving the determined temperature and for controlling a gate bias voltage corresponding to the determined temperature and an amplifier for amplifying a Radio Frequency (RF) signal by using the controlled gate bias voltage.
    Type: Application
    Filed: January 25, 2008
    Publication date: August 7, 2008
    Applicant: SAMSUNG ELECTRONICS CO. LTD.
    Inventor: Jong-Hyun LEE
  • Publication number: 20080175306
    Abstract: The transmission apparatus and transmission power controlling method are able to keep high speed feedback control and control transmission power accurately. Polar modulation transmitter (100) is provided with LPF (108) that performs waveform shaping of output power of PA (103) and ADC (109) that obtains output power data for each mode by sampling filtered signals in compressed mode and filtered signals in uncompressed mode at the same phase as the filtered signals in compressed mode. In this way, the phases of sampling signals before and after the mode change are the same, so that it is possible to obtain sampling signals of the same condition before and after the mode change, from filtered signal waveforms. According to feedback control based on these sampling signals, even if drift components remain in the filtered signals, the influence can be ignored, so that it is possible to keep high speed feedback control, and estimate and control transmission power accurately.
    Type: Application
    Filed: January 11, 2008
    Publication date: July 24, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Akihiko MATSUOKA, Tomoya Urushihara, Wayne Lee, Gary Do
  • Patent number: 7386075
    Abstract: An apparatus for and method of extending the dynamic range of a RF communications receiver. The invention provides a mechanism for controlling the gain of both the LNA and down conversion mixer in the front end portion of an RF receiver. Both the LNA and the mixer are adapted to have both low and high gain modes of operation. The control mechanism typically comprises a two bit gain control that places both the LNA and mixer in one of four operating gain mode states. The selection of the most appropriate operating gain mode state, is preferably determined in accordance with various metrics such as the received levels of the desired signal, levels of interference signals, bit error rate and receiver RSSI.
    Type: Grant
    Filed: July 12, 2005
    Date of Patent: June 10, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Alexander Mostov, Oren Eliezer
  • Patent number: 7323922
    Abstract: A signal processing system has a first, digitally controlled, gain element, a second, analogue controlled, gain element and a gain control unit configured to receive a gain request signal and to generate a first gain control signal to be input to the first gain element and a second gain control signal to be input to the second gain element such that the gain provided by the signal processing system corresponds to the gain request signal.
    Type: Grant
    Filed: July 20, 2004
    Date of Patent: January 29, 2008
    Assignee: Analog Devices, Inc.
    Inventor: Christopher Geraint Jones
  • Patent number: 7266360
    Abstract: A low noise amplifier is provided for the receiver of a wireless communications system. The amplifier incorporates an image rejection function by incorporating a notch filter formed by an inductor and capacitor connected at a node between two active elements of the amplifier. The amplifier also incorporates a gain control function by adding a further active element connected to, on one hand, a node between the inductor and capacitor and, on the other hand, a voltage supply. A gain control signal is connected to the control input of the further active element has an input connected to a feedback lead of the receiver to provide the gain control.
    Type: Grant
    Filed: April 7, 2004
    Date of Patent: September 4, 2007
    Assignee: Neoreach, Inc.
    Inventors: Dong Kyun Kang, Kurt Gordon, Jay Wright
  • Patent number: 6952159
    Abstract: A coupling apparatus (1) having a mains connection (2) for connection to a low-voltage mains power supply system, and having an appliance connection (3) for connection of any appliance for transmitting and/or receiving an RF signal has a voltage converter (5) and a high-pass filter (6.1, 6.2). The voltage converter converts the mains voltage which is present at the mains connection to a very-low voltage, which is suitable for supplying the appliance connected to the appliance connection. Inductances (4.3 to 4.6) of suitable size are interposed in the appropriate connecting lines as low-pass filters for decoupling the RF signal path from the supply signal path, and for suppressing undesirable, radio-frequency signal components in the supply voltages. RF signals which are transmitted or are to be transmitted via the low-voltage mains power supply system are coupled from the mains connection via the high-pass filter to the appliance connection, and from the appliance connection to the mains connection.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: October 4, 2005
    Assignee: Ascom Powerline Communications AG
    Inventor: Kurt Müller
  • Patent number: 6710662
    Abstract: A power amplifier includes drains and sources of a plurality of transistors connected to each other to produce a plurality of common drains and a plurality of common sources, wherein the common drains are connected at a common drain point and wherein the common drain point is connected via an RF choke to a power supply voltage terminal and wherein the common sources are grounded; an output terminal connected to the RF choke; a plurality of bias terminals each coupled via a resistor to the gate of one of the plurality of transistors wherein each of the gates of the plurality of transistors is also capacitively coupled to a radio frequency input.
    Type: Grant
    Filed: September 16, 2002
    Date of Patent: March 23, 2004
    Assignee: Berkana Wireless, Inc.
    Inventor: Sung-ho Wang
  • Patent number: 5272449
    Abstract: A vertical amplifier system for a multitrace oscilloscope including a first and a second variable gain amplifiers each connected to each channel of a multitrace oscilloscope. First, a first reference voltage is fed to the two variable gain amplifiers at the same time. The polarity of output of the second variable gain amplifier is inverted, and the inverted output is added to the output of the first variable gain amplifier by an adder. The added result is detected by a resistor. A CPU automatically controls a gain of at least one of the variable gain amplifiers while receiving the added result so that the added result becomes zero. Second, a second reference voltage (a ground level voltage, for example) is applied to both variable gain amplifiers, and an offset of at least one of the variable gain amplifiers is adjusted so that the added result detected by the resistor becomes zero. The input-output characteristics of both variable gain amplifiers are equalized with high accuracy.
    Type: Grant
    Filed: March 4, 1993
    Date of Patent: December 21, 1993
    Assignee: Kikusui Electronics Corporation
    Inventor: Masao Izawa
  • Patent number: 5204637
    Abstract: A controlled-output power amplifier (50) is provided having a wide dynamic range in a plurality of output power levels. The controlled-output amplifier (50) includes an amplifier (12) for receiving an input signal (14) and for providing an output signal (16) therefrom. A power detector (24) is employed for rectifying a sample signal and providing a DC output signal (26) therefrom. An active variable coupling network (52) which preferably includes a varactor (62) is connected between the output of the amplifier (12) and the power detector (24). The variable coupling network (52) receives the amplifier output signal (16) and further receives an isolation voltage (54) and adjusts the amount of isolation between the amplifier (12) and the power detector (24). For high output signals, the isolation voltage (54) causes a high isolation thereby causing less power to be transferred to the power detector (24).
    Type: Grant
    Filed: April 17, 1992
    Date of Patent: April 20, 1993
    Assignee: Hughes Aircraft Company
    Inventor: Lanh Trinh
  • Patent number: 5101175
    Abstract: In a digital radio telephone transmitter an output pulse with e.g. cos.sup.2 -shaped edges is produced by a voltage controlled power amplifier (4). When known control loop circuitry is used, the power (Pout) of the output pulse will rise almost step-wise at the beginning of the pulse, which leads to the spreading of the spectrum and to rise time delays of the output pulse with respect to the control pulse (TXC) at different power levels. According to the invention a good cos.sup.2 -shape of the output pulse (Pout) and its tracking of the control pulse (TXC) almost without delay is achieved so that a squarewave pulse (V.sub.p) is added to the control voltage (V2) of the power amplifier (4), the pulse (V.sub.p) starting and ending substantially at the same time as the control pulse (TXC). In a preferred embodiment the squarewave pulse (V.sub.p) is added to the control voltage (V2) only during that time when the control voltage (V2) is below that value, at which the control loop begins to operate.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: March 31, 1992
    Assignee: Nokia Mobile Phones Ltd.
    Inventor: Risto Vaisanen
  • Patent number: 4754230
    Abstract: The clipping suppression arrangement for a compandorized communication system, includes a limiter peak level detector for causing the gain of an input amplifier to be reduced quickly when a compressed output is driven toward a clipping output condition.
    Type: Grant
    Filed: March 27, 1987
    Date of Patent: June 28, 1988
    Assignee: HM Electronics, Inc.
    Inventors: Lee J. Schwartz, Michael A. Williams
  • Patent number: 4277755
    Abstract: A nonlinear signal transducer U, such as a light-emitting diode or a semiconductive laser, is maintained at a suitable operating point by a constant biasing current and receives an electrical input signal by way of a series resistor R from a main amplifier AM of variable gain. The output voltage of the main amplifier is detected and integrated to provide a first reference voltage which is compared with the load voltage of the transducer U in a differential amplifier AE1, forming part of a first feedback loop, to adjust a voltage generator GT controlling the output voltage of the main amplifier AM so as to eliminate any voltage drop across the series resistor R as long as the input signal is absent or has an instantaneous magnitude equal to its mean value.
    Type: Grant
    Filed: October 4, 1979
    Date of Patent: July 7, 1981
    Assignee: CSELT - Centro Studi e Laboratori Telecomunicazioni S.p.A.
    Inventors: Alfredo Fausone, Vittorio Seano
  • Patent number: 4189973
    Abstract: An electronic organ in which a manually adjustable potentiometer varies the control voltage supplied to a voltage controlled amplifier interposed between a source of tone signals and an organ output circuit with the potentiometer being connected to the amplifier by a circuit which eliminates scratching and discontinuity in the potentiometer output. The amplifier can be bypassed by circuitry for supplying lower frequency bass signals to the amplifier output under conditions of high attenuation of the incoming signal in the amplifier.
    Type: Grant
    Filed: July 8, 1977
    Date of Patent: February 26, 1980
    Assignee: Kimball International, Inc.
    Inventor: Patrick K. Doane