CA2176551A1 - Method and Apparatus for Amplifying a Signal - Google Patents

Method and Apparatus for Amplifying a Signal

Info

Publication number
CA2176551A1
CA2176551A1 CA2176551A CA2176551A CA2176551A1 CA 2176551 A1 CA2176551 A1 CA 2176551A1 CA 2176551 A CA2176551 A CA 2176551A CA 2176551 A CA2176551 A CA 2176551A CA 2176551 A1 CA2176551 A1 CA 2176551A1
Authority
CA
Canada
Prior art keywords
vvc
power amplifier
power
signal
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2176551A
Other languages
French (fr)
Other versions
CA2176551C (en
Inventor
Jin Dong Kim
James John Crnkovic
Armin Werner Klomsdorf
David Sutherland Peckham
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola Inc filed Critical Motorola Inc
Publication of CA2176551A1 publication Critical patent/CA2176551A1/en
Application granted granted Critical
Publication of CA2176551C publication Critical patent/CA2176551C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0216—Continuous control
    • H03F1/0233—Continuous control by using a signal derived from the output signal, e.g. bootstrapping the voltage supply
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers

Abstract

A unique method and apparatus modifies the load impedance at the output of a power amplifier by varying a voltage variable capacitor (VVC) (310) to maximize the efficiency of the power amplifier (304). A
comparator (509) generates amplifier control signal (211) based upon a detected power output signal (216) and a reference signal. In addition to providing power control, the control signal is also coupled to a VVC
circuit (506) to control the output impedance of the power amplifier. In an alternate embodiment, a separate VVC control signal (527) based upon a comparison of the power control signal and the battery voltage is coupled to a VVC. In another alternate embodiment, a second VVC
can be coupled in parallel to the first VVC. The second VVC is preferably controlled by a signal (805) based upon the current in the power amplifier. Finally, an alternate embodiment incorporates a VVC
circuit (506) at the input of the power amplifier to compensate for variations in input impedance to improve other power amplifier parameters such as IM, gain, output power and noise level.
CA002176551A 1995-06-07 1996-05-14 Method and apparatus for amplifying a signal Expired - Fee Related CA2176551C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/482,158 US5673001A (en) 1995-06-07 1995-06-07 Method and apparatus for amplifying a signal
US08/482,158 1995-06-07

Publications (2)

Publication Number Publication Date
CA2176551A1 true CA2176551A1 (en) 1996-12-08
CA2176551C CA2176551C (en) 1999-06-15

Family

ID=23914952

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002176551A Expired - Fee Related CA2176551C (en) 1995-06-07 1996-05-14 Method and apparatus for amplifying a signal

Country Status (10)

Country Link
US (2) US5673001A (en)
JP (2) JPH098576A (en)
CN (1) CN1058117C (en)
AR (1) AR002401A1 (en)
BR (1) BR9602624A (en)
CA (1) CA2176551C (en)
GB (1) GB2301964B (en)
IT (1) IT1285195B1 (en)
MX (1) MX9602253A (en)
ZA (1) ZA964876B (en)

Families Citing this family (154)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6002922A (en) * 1996-12-17 1999-12-14 Motorola, Inc. Method and apparatus for detecting communication signals
FI108177B (en) * 1997-01-03 2001-11-30 Nokia Mobile Phones Ltd Transmitter for mobile equipment
EP0854569B1 (en) * 1997-01-21 2003-04-09 Matsushita Electric Industrial Co., Ltd. High-frequency power amplifier
JP3475037B2 (en) 1997-03-14 2003-12-08 株式会社東芝 transceiver
US6009119A (en) * 1997-03-25 1999-12-28 Intermec Ip Corp. Adaptive power leveling of an RF transceiver utilizing information stored in non-volatile memory
US5880635A (en) * 1997-04-16 1999-03-09 Sony Corporation Apparatus for optimizing the performance of a power amplifier
JPH10335980A (en) * 1997-06-04 1998-12-18 Nec Corp Low-distortion high-efficiency matching circuit
FR2767013B1 (en) * 1997-07-31 1999-10-01 Alsthom Cge Alcatel METHOD AND DEVICE FOR MONITORING THE ENVELOPE OF A RADIO SIGNAL
JPH11312988A (en) * 1998-04-30 1999-11-09 Nec Corp Method and device for transmitting micro wave and millimeter wave
US6430402B1 (en) * 1998-09-14 2002-08-06 Conexant Systems, Inc. Power amplifier saturation prevention method, apparatus, and communication system incorporating the same
US6687516B2 (en) * 1998-10-08 2004-02-03 E-Lead Electronic Co., Ltd. Hand-free receiver signal wire for mobile telephone
US6556814B1 (en) * 1999-07-22 2003-04-29 Motorola, Inc. Memory-based amplifier load adjust system
US6349216B1 (en) 1999-07-22 2002-02-19 Motorola, Inc. Load envelope following amplifier system
US6166598A (en) * 1999-07-22 2000-12-26 Motorola, Inc. Power amplifying circuit with supply adjust to control adjacent and alternate channel power
US6438360B1 (en) 1999-07-22 2002-08-20 Motorola, Inc. Amplifier system with load control to produce an amplitude envelope
US6160449A (en) * 1999-07-22 2000-12-12 Motorola, Inc. Power amplifying circuit with load adjust for control of adjacent and alternate channel power
US6252456B1 (en) 1999-07-29 2001-06-26 Motorola, Inc. Power amplifier load controller and method for controlling a power amplifier load
US6559722B1 (en) * 1999-08-10 2003-05-06 Anadigics, Inc. Low bias current/temperature compensation current mirror for linear power amplifier
US6281748B1 (en) 2000-01-14 2001-08-28 Motorola, Inc. Method of and apparatus for modulation dependent signal amplification
JP4679686B2 (en) * 2000-02-07 2011-04-27 パナソニック株式会社 Wireless communication apparatus and transmission power control method
KR100325420B1 (en) * 2000-02-15 2002-02-21 강인호 Envelope tracking amplifier having improved gain, terminal for mobile communication using the same, and method for improving gain relating thereto
GB2359680B (en) * 2000-02-25 2002-05-15 Motorola Israel Ltd Apparatus for linear transmitter with improved loop gain stabilization
US6362690B1 (en) 2000-04-19 2002-03-26 Ophir Rf, Inc. System and method for closed loop VSWR correction and tuning in RF power amplifiers
US8744384B2 (en) * 2000-07-20 2014-06-03 Blackberry Limited Tunable microwave devices with auto-adjusting matching circuit
US8064188B2 (en) 2000-07-20 2011-11-22 Paratek Microwave, Inc. Optimized thin film capacitors
US6476677B1 (en) * 2000-08-30 2002-11-05 Skyworks Solutions, Inc. Power amplifier saturation detection and compensation
US6856199B2 (en) 2000-10-10 2005-02-15 California Institute Of Technology Reconfigurable distributed active transformers
US6816012B2 (en) 2000-10-10 2004-11-09 California Institute Of Technology Distributed circular geometry power amplifier architecture
US6690251B2 (en) 2001-04-11 2004-02-10 Kyocera Wireless Corporation Tunable ferro-electric filter
US7394430B2 (en) * 2001-04-11 2008-07-01 Kyocera Wireless Corp. Wireless device reconfigurable radiation desensitivity bracket systems and methods
US7221243B2 (en) * 2001-04-11 2007-05-22 Kyocera Wireless Corp. Apparatus and method for combining electrical signals
US7154440B2 (en) * 2001-04-11 2006-12-26 Kyocera Wireless Corp. Phase array antenna using a constant-gain phase shifter
US7746292B2 (en) * 2001-04-11 2010-06-29 Kyocera Wireless Corp. Reconfigurable radiation desensitivity bracket systems and methods
US7164329B2 (en) 2001-04-11 2007-01-16 Kyocera Wireless Corp. Tunable phase shifer with a control signal generator responsive to DC offset in a mixed signal
US7174147B2 (en) * 2001-04-11 2007-02-06 Kyocera Wireless Corp. Bandpass filter with tunable resonator
US7071776B2 (en) 2001-10-22 2006-07-04 Kyocera Wireless Corp. Systems and methods for controlling output power in a communication device
US6710651B2 (en) * 2001-10-22 2004-03-23 Kyocera Wireless Corp. Systems and methods for controlling output power in a communication device
US7184727B2 (en) * 2002-02-12 2007-02-27 Kyocera Wireless Corp. Full-duplex antenna system and method
US7176845B2 (en) * 2002-02-12 2007-02-13 Kyocera Wireless Corp. System and method for impedance matching an antenna to sub-bands in a communication band
US7180467B2 (en) * 2002-02-12 2007-02-20 Kyocera Wireless Corp. System and method for dual-band antenna matching
TWI326967B (en) * 2002-03-11 2010-07-01 California Inst Of Techn Differential amplifier
FR2840467A1 (en) * 2002-05-28 2003-12-05 St Microelectronics Sa HIGH FREQUENCY COUPLER
ATE385625T1 (en) * 2002-05-31 2008-02-15 Ericsson Telefon Ab L M POWER AMPLIFIER
US6806767B2 (en) * 2002-07-09 2004-10-19 Anadigics, Inc. Power amplifier with load switching circuit
WO2004013957A2 (en) * 2002-08-01 2004-02-12 Telefonaktiebolaget L M Ericsson (Publ) Circuit for power amplification
DE60226317T2 (en) * 2002-08-01 2009-06-25 Telefonaktiebolaget Lm Ericsson (Publ) CIRCUIT FOR POWER AMPLIFIERS
EP1394939B1 (en) * 2002-08-29 2009-05-20 STMicroelectronics S.A. Closed-loop control of an analog system producing an output signal from a control signal
US6946910B2 (en) * 2002-08-29 2005-09-20 Agilent Technologies, Inc. Configurable feedback path in an amplitude control system
ATE467265T1 (en) * 2002-09-17 2010-05-15 Nxp Bv OBTAINING LINEARITY OF A RF POWER AMPLIFIER
US7010284B2 (en) * 2002-11-06 2006-03-07 Triquint Semiconductor, Inc. Wireless communications device including power detector circuit coupled to sample signal at interior node of amplifier
US6794935B2 (en) * 2002-10-17 2004-09-21 Motorola Inc. Power amplification circuit and method for supplying power at a plurality of desired power output levels
US7058372B1 (en) * 2002-11-01 2006-06-06 Integration Associates Inc. Method and apparatus for automatic tuning of a resonant loop antenna
US7190933B2 (en) * 2002-11-01 2007-03-13 Intergration Associates Inc. Method and apparatus for automatic tuning of a resonant loop antenna in a transceiver circuit
KR100526560B1 (en) * 2002-12-07 2005-11-03 삼성전자주식회사 Optical fiber amplifier having automatic power control function and automatic power control method thereof
FI20030471A0 (en) * 2003-03-31 2003-03-31 Jorma Kullervo Romunen Standardizing the transmission level of a message transmission system in a low-voltage network independent of the supply line
US7720443B2 (en) 2003-06-02 2010-05-18 Kyocera Wireless Corp. System and method for filtering time division multiple access telephone communications
EP1499020A1 (en) * 2003-07-17 2005-01-19 Siemens Aktiengesellschaft Circuit and method for adapting the current consumption and the output power of power amplifiers in mobile telephones to various environment conditions
JP3841416B2 (en) * 2003-10-07 2006-11-01 松下電器産業株式会社 Transmission device, transmission output control method, and wireless communication device
DE60305505T2 (en) * 2003-10-23 2007-04-26 Sony Ericsson Mobile Communications Ab Power control circuitry for a mobile terminal application
US7343138B2 (en) * 2003-12-08 2008-03-11 M/A-Com, Inc. Compensating for load pull in electromagentic signal propagation using adaptive impedance matching
US7151411B2 (en) * 2004-03-17 2006-12-19 Paratek Microwave, Inc. Amplifier system and method
US7440729B2 (en) * 2004-04-16 2008-10-21 M/A-Com Eurotec B.V. Apparatus, methods and articles of manufacture for output impedance matching using multi-band signal processing
US20050245204A1 (en) * 2004-05-03 2005-11-03 Vance Scott L Impedance matching circuit for a mobile communication device
JP4515821B2 (en) * 2004-05-25 2010-08-04 ルネサスエレクトロニクス株式会社 Drive circuit, operation state detection circuit, and display device
EP1610257A1 (en) * 2004-06-23 2005-12-28 St Microelectronics S.A. Impedance matching in reader of electromagnetic transponder
US7248845B2 (en) * 2004-07-09 2007-07-24 Kyocera Wireless Corp. Variable-loss transmitter and method of operation
JP4536468B2 (en) * 2004-09-21 2010-09-01 パナソニック株式会社 Class E amplifier and EER modulation amplifier
JP4606843B2 (en) * 2004-11-01 2011-01-05 京セラ株式会社 Wireless communication module, communication terminal, and impedance matching method
KR101081267B1 (en) 2004-11-29 2011-11-08 엘지이노텍 주식회사 Power amplifier circuit
US7346317B2 (en) * 2005-04-04 2008-03-18 Freescale Semiconductor, Inc. Dynamic gain and phase compensation for power amplifier load switching
JP4750463B2 (en) * 2005-05-11 2011-08-17 ルネサスエレクトロニクス株式会社 High frequency power amplifier, transmitter using the same, and mobile communication terminal
US20060280261A1 (en) * 2005-06-10 2006-12-14 M/A-Com Eurotec Bv. System and method for controlling power output from a power amplifier
KR100756426B1 (en) 2005-06-16 2007-09-07 한국과학기술원 Mdac circuit with gain error correction and sample/hold circuit
WO2007010543A1 (en) * 2005-07-20 2007-01-25 Paragon Communications Ltd. A method and apparatus for increasing the efficiency of low power amplifiers
JP2007104280A (en) * 2005-10-04 2007-04-19 Nec Electronics Corp High-frequency power amplifier circuit
JP2007124038A (en) * 2005-10-25 2007-05-17 Mitsubishi Electric Corp High frequency amplifier
US7848180B2 (en) * 2005-10-28 2010-12-07 Casio Computer Co., Ltd. Antenna apparatus, receiving apparatus and watch using magnetic sensor
US9406444B2 (en) 2005-11-14 2016-08-02 Blackberry Limited Thin film capacitors
WO2007060675A1 (en) * 2005-11-28 2007-05-31 Paragon Communications Ltd. Method and apparatus for optimizing current consumption of amplifiers with power control
US7548762B2 (en) * 2005-11-30 2009-06-16 Kyocera Corporation Method for tuning a GPS antenna matching network
US8325097B2 (en) * 2006-01-14 2012-12-04 Research In Motion Rf, Inc. Adaptively tunable antennas and method of operation therefore
US8125399B2 (en) 2006-01-14 2012-02-28 Paratek Microwave, Inc. Adaptively tunable antennas incorporating an external probe to monitor radiated power
US7711337B2 (en) 2006-01-14 2010-05-04 Paratek Microwave, Inc. Adaptive impedance matching module (AIMM) control architectures
US7729667B2 (en) * 2006-02-16 2010-06-01 Raytheon Company System and method for intermodulation distortion cancellation
US7477102B1 (en) * 2006-03-17 2009-01-13 Hrl Laboratories, Llc High efficiency linear microwave power amplifier
JP4733560B2 (en) * 2006-04-25 2011-07-27 シャープ株式会社 Power amplifier and wireless communication device
US20070270111A1 (en) * 2006-05-19 2007-11-22 Broadcom Corporation Dual power mode transmitter
US7860467B2 (en) * 2006-08-29 2010-12-28 Broadcom Corporation Power control for a dual mode transmitter
US20100271119A1 (en) * 2006-10-23 2010-10-28 Walid Karoui Envelope detector, linearization circuit, amplifier circuit, method for detecting a modulation envelope and wireless communication unit
CN101636915A (en) * 2006-10-25 2010-01-27 Nxp股份有限公司 Determining on chip load impedance of rf circuit
US8299867B2 (en) * 2006-11-08 2012-10-30 Research In Motion Rf, Inc. Adaptive impedance matching module
US7535312B2 (en) 2006-11-08 2009-05-19 Paratek Microwave, Inc. Adaptive impedance matching apparatus, system and method with improved dynamic range
US7714676B2 (en) 2006-11-08 2010-05-11 Paratek Microwave, Inc. Adaptive impedance matching apparatus, system and method
US7813777B2 (en) * 2006-12-12 2010-10-12 Paratek Microwave, Inc. Antenna tuner with zero volts impedance fold back
US8004364B2 (en) * 2006-12-22 2011-08-23 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration High power RF solid state power amplifier system
KR101451455B1 (en) * 2007-01-25 2014-10-15 스카이워크스 솔루션즈, 인코포레이티드 Multimode amplifier for operation in linear and saturated modes
US7917104B2 (en) * 2007-04-23 2011-03-29 Paratek Microwave, Inc. Techniques for improved adaptive impedance matching
US20080274706A1 (en) * 2007-05-01 2008-11-06 Guillaume Blin Techniques for antenna retuning utilizing transmit power information
US8213886B2 (en) 2007-05-07 2012-07-03 Paratek Microwave, Inc. Hybrid techniques for antenna retuning utilizing transmit and receive power information
WO2008141056A1 (en) * 2007-05-10 2008-11-20 Skyworks Solutions, Inc. System and method for power detection in a power amplifier
CN101772887B (en) 2007-07-05 2013-04-24 斯盖沃克斯瑟路申斯公司 Systems and methods for saturation detection and correction in a power control loop
US9071317B2 (en) * 2007-07-06 2015-06-30 Broadcom Corportion Nullification of transmitter noise at receive signal frequency
US8019292B2 (en) * 2007-07-11 2011-09-13 Axiom Microdevices, Inc. Power amplifier amplitude modulator system and method
US7710197B2 (en) * 2007-07-11 2010-05-04 Axiom Microdevices, Inc. Low offset envelope detector and method of use
US7979039B2 (en) * 2007-09-24 2011-07-12 Intel Corporation Pre-distorting a transmitted signal for offset cancellation
US7991363B2 (en) 2007-11-14 2011-08-02 Paratek Microwave, Inc. Tuning matching circuits for transmitter and receiver bands as a function of transmitter metrics
US8452243B2 (en) * 2008-05-08 2013-05-28 Skyworks Solutions, Inc. System and method for power detection in a power amplifier using an adjustable load
US8072285B2 (en) 2008-09-24 2011-12-06 Paratek Microwave, Inc. Methods for tuning an adaptive impedance matching network with a look-up table
US8067858B2 (en) * 2008-10-14 2011-11-29 Paratek Microwave, Inc. Low-distortion voltage variable capacitor assemblies
FR2937433B1 (en) * 2008-10-16 2010-11-26 St Microelectronics Sa INPUT / OUTPUT CIRCUIT WITH COMPENSATION BLOCK.
US8688058B2 (en) * 2008-11-24 2014-04-01 Chiewcharn Narathong Techniques for improving transmitter performance
US7863941B1 (en) 2009-02-04 2011-01-04 Altera Corporation Techniques for canceling offsets in differential circuits
US7982543B1 (en) 2009-03-30 2011-07-19 Triquint Semiconductor, Inc. Switchable power amplifier
US8027648B2 (en) * 2009-04-29 2011-09-27 Lockheed Martin Corporation Radio frequency power monitor
US8779857B2 (en) * 2009-08-14 2014-07-15 Qualcomm Incorporated Amplifier with variable matching circuit to improve linearity
US8472888B2 (en) * 2009-08-25 2013-06-25 Research In Motion Rf, Inc. Method and apparatus for calibrating a communication device
US8207798B1 (en) 2009-09-09 2012-06-26 Triquint Semiconductor, Inc. Matching network with switchable capacitor bank
US9026062B2 (en) 2009-10-10 2015-05-05 Blackberry Limited Method and apparatus for managing operations of a communication device
GB2476035B (en) * 2009-12-08 2016-06-01 Microsoft Technology Licensing Llc Improvements relating to power amplifiers and antennas
US8629719B2 (en) * 2010-02-04 2014-01-14 Epcos Ag Amplifier circuit and method for signal sensing
US8803631B2 (en) 2010-03-22 2014-08-12 Blackberry Limited Method and apparatus for adapting a variable impedance network
US8860526B2 (en) 2010-04-20 2014-10-14 Blackberry Limited Method and apparatus for managing interference in a communication device
US8611834B2 (en) 2010-11-01 2013-12-17 Cree, Inc. Matching network for transmission circuitry
US9379454B2 (en) 2010-11-08 2016-06-28 Blackberry Limited Method and apparatus for tuning antennas in a communication device
US8712340B2 (en) 2011-02-18 2014-04-29 Blackberry Limited Method and apparatus for radio antenna frequency tuning
US8655286B2 (en) 2011-02-25 2014-02-18 Blackberry Limited Method and apparatus for tuning a communication device
US9166562B2 (en) 2013-02-25 2015-10-20 Qualcomm Incorporated Impedance transformation network for improved driver circuit performance
US10381874B2 (en) 2011-03-25 2019-08-13 Qualcomm Incorporated Filter for improved driver circuit efficiency and method of operation
US8594584B2 (en) 2011-05-16 2013-11-26 Blackberry Limited Method and apparatus for tuning a communication device
US8626083B2 (en) 2011-05-16 2014-01-07 Blackberry Limited Method and apparatus for tuning a communication device
US8836423B2 (en) * 2011-06-07 2014-09-16 Avago Technologies General Ip (Singapore) Pte. Ltd. Method and apparatus for automatically adjusting the bandwidth of an electronic amplifier
WO2013022826A1 (en) 2011-08-05 2013-02-14 Research In Motion Rf, Inc. Method and apparatus for band tuning in a communication device
WO2013063212A1 (en) * 2011-10-27 2013-05-02 Marvell World Trade Ltd. Systems and methods for performing multi-modal power amplification
US8902015B1 (en) 2011-11-18 2014-12-02 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Radio frequency power load and associated method
CN103427868B (en) * 2012-05-16 2016-04-06 京信通信系统（中国）有限公司 A kind of control method of radiofrequency signal and equipment
US8948889B2 (en) 2012-06-01 2015-02-03 Blackberry Limited Methods and apparatus for tuning circuit components of a communication device
US9853363B2 (en) 2012-07-06 2017-12-26 Blackberry Limited Methods and apparatus to control mutual coupling between antennas
US9246223B2 (en) 2012-07-17 2016-01-26 Blackberry Limited Antenna tuning for multiband operation
US9350405B2 (en) 2012-07-19 2016-05-24 Blackberry Limited Method and apparatus for antenna tuning and power consumption management in a communication device
US9413066B2 (en) 2012-07-19 2016-08-09 Blackberry Limited Method and apparatus for beam forming and antenna tuning in a communication device
US9362891B2 (en) 2012-07-26 2016-06-07 Blackberry Limited Methods and apparatus for tuning a communication device
US9374113B2 (en) 2012-12-21 2016-06-21 Blackberry Limited Method and apparatus for adjusting the timing of radio antenna tuning
US10404295B2 (en) 2012-12-21 2019-09-03 Blackberry Limited Method and apparatus for adjusting the timing of radio antenna tuning
US9438982B2 (en) 2013-09-16 2016-09-06 Cirrus Logic, Inc. Systems and methods for detection of load impedance of a transducer device coupled to an audio device
US9479868B2 (en) 2013-09-16 2016-10-25 Cirrus Logic, Inc. Systems and methods for detection of load impedance of a transducer device coupled to an audio device
US9231531B2 (en) * 2013-12-26 2016-01-05 Mediatek Inc. Communication system and method for detecting loading variation of power amplifier thereof
US9438319B2 (en) 2014-12-16 2016-09-06 Blackberry Limited Method and apparatus for antenna selection
JP6651835B2 (en) * 2015-03-13 2020-02-19 ヤマハ株式会社 Power amplifier
CN104734654A (en) * 2015-03-23 2015-06-24 武汉滨湖电子有限责任公司 Amplitude digital control equipment and amplitude digital control method of non-linear power amplifier
CN105791825B (en) * 2016-03-11 2018-10-26 武汉大学 A kind of screen picture coding method based on H.264 with hsv color quantization
US10122326B2 (en) 2016-11-04 2018-11-06 Qualcomm Incorporated Systems and methods providing loadline modulation of a power amplifier
CN108551332B (en) * 2018-02-09 2022-05-10 沃勤科技有限公司 Power amplifier with self-adaptive and adjustable frequency and bandwidth and adjusting method
EP3886243A1 (en) * 2020-03-27 2021-09-29 Nokia Technologies Oy A radio-frequency switching apparatus
US11211909B2 (en) 2020-06-02 2021-12-28 Globalfoundries U.S. Inc. Adjustable capacitors to improve linearity of low noise amplifier

Family Cites Families (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3449680A (en) * 1966-03-29 1969-06-10 Motorola Inc Transistor protection circuit
US3560995A (en) * 1967-06-29 1971-02-02 Us Navy Voltage controlled monolithic automatic gain control attenuator device
US4225827A (en) * 1979-02-21 1980-09-30 Harris Corporation Stabilization circuit for transistor RF power amplifiers
US4367443A (en) * 1980-01-17 1983-01-04 Motorola, Inc. Radio frequency signal power amplifier
US4390851A (en) * 1980-11-25 1983-06-28 Rockwell International Corporation Monolithic microwave amplifier having active impedance matching
US4442407A (en) * 1982-06-11 1984-04-10 The United States Of America As Represented By The Secretary Of The Army Two loop automatic level control for power amplifier
JPS5999851A (en) * 1982-11-29 1984-06-08 Nec Corp Signal control circuit
US4547746A (en) * 1984-04-09 1985-10-15 Rockwell International Corporation VSWR Tolerant linear power amplifier
US4602218A (en) * 1985-04-30 1986-07-22 Motorola, Inc. Automatic output control circuitry for RF power amplifiers with wide dynamic range
US4628275A (en) * 1985-07-29 1986-12-09 Rockwell International Corporation Efficient power amplifier for high capacitive devices
US4689576A (en) * 1985-08-02 1987-08-25 Motorola, Inc. Linearization circuit
JPH0773243B2 (en) * 1985-12-12 1995-08-02 日本電気株式会社 Transmitter
SE455455B (en) * 1986-11-11 1988-07-11 Ericsson Telefon Ab L M FINAL STEP WITH AUTOMATIC LEVEL CONTROL FOR NETWORK SIGNAL
JPH0227279A (en) * 1988-07-15 1990-01-30 Sharp Corp Superconductor magnetic measuring apparatus
GB8826918D0 (en) * 1988-11-17 1988-12-21 Motorola Inc Power amplifier for radio frequency signal
JP2609310B2 (en) * 1988-12-22 1997-05-14 株式会社日立製作所 Transmission circuit
NL8900507A (en) * 1989-03-02 1990-10-01 Philips Nv AMPLIFIER CIRCUIT WITH SATURATION DETECTION.
CA2017904C (en) * 1989-05-31 1993-11-16 Shinichi Miyazaki High frequency amplifier circuit capable of optimizing a total power consumption
GB2233515B (en) * 1989-06-20 1993-12-15 Technophone Ltd Levelling control circuit
US4985686A (en) * 1989-12-04 1991-01-15 Motorola, Inc. Active load impedance control system for radio frequency power amplifiers
US5276912A (en) * 1990-02-06 1994-01-04 Motorola, Inc. Radio frequency power amplifier having variable output power
US5126688A (en) * 1990-03-20 1992-06-30 Oki Electric Co., Ltd. Power amplifying apparatus for wireless transmitter
US5043672A (en) * 1990-03-26 1991-08-27 Novatel Communications Ltd. Power detector utilizing bias voltage divider for precision control of an amplifier
IT1239472B (en) * 1990-04-09 1993-11-02 Sits Soc It Telecom Siemens LINEARIZER OF THE PRE-DISTORTION TYPE FOR MICROWAVE POWER AMPLIFIERS
US5060294A (en) * 1990-07-05 1991-10-22 Motorola, Inc. Dual mode power amplifier for radiotelephone
JP3086512B2 (en) * 1990-11-14 2000-09-11 エリクソン−ジーイー モービル コミュニケーションズ ホールディング インコーポレイテッド Transmitter and its power amplifier circuit
JPH0480140U (en) * 1990-11-26 1992-07-13
WO1992011702A1 (en) * 1990-12-17 1992-07-09 Motorola, Inc. Dynamically biased amplifier
US5175879A (en) * 1991-04-25 1992-12-29 Motorola, Inc. Linear amplifier with feedback path and phase error compensation
JPH04328318A (en) * 1991-04-30 1992-11-17 Kao Corp Magnetic recording medium
US5278994A (en) * 1991-06-03 1994-01-11 Motorola, Inc. Power amplifier saturation detection and correction method and apparatus
US5150075A (en) * 1991-06-03 1992-09-22 Motorola, Inc. Power amplifier ramp up method and apparatus
JP2776071B2 (en) * 1991-07-19 1998-07-16 松下電器産業株式会社 Transmission output envelope detection circuit and linear transmission circuit
US5173835A (en) * 1991-10-15 1992-12-22 Motorola, Inc. Voltage variable capacitor
US5204637A (en) * 1992-04-17 1993-04-20 Hughes Aircraft Company Power detection technique for automatic amplifier power control
US5317277A (en) * 1992-12-08 1994-05-31 Doble Engineering Company Power amplifying apparatus for supplying A.C. signals having a maximum loop gain at a desired frequency
US5329259A (en) * 1993-02-11 1994-07-12 Motorola, Inc. Efficient amplitude/phase modulation amplifier
US5339041A (en) * 1993-07-06 1994-08-16 The Boeing Company High efficiency power amplifier
US5412341A (en) * 1993-10-28 1995-05-02 Motorola, Inc. Power control apparatus and method for a radio frequency amplifier
GB2289989B (en) * 1994-05-25 1999-01-06 Nokia Mobile Phones Ltd Adaptive antenna matching
US5589796A (en) * 1994-11-01 1996-12-31 Motorola, Inc Method and apparatus for increasing amplifier efficiency

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GB2301964B (en) 2000-08-02
US6020787A (en) 2000-02-01
AR002401A1 (en) 1998-03-11
ITRM960394A1 (en) 1997-12-05
JPH098576A (en) 1997-01-10
GB9611239D0 (en) 1996-07-31
GB2301964A (en) 1996-12-18
CA2176551C (en) 1999-06-15
MX9602253A (en) 1997-01-31
IT1285195B1 (en) 1998-06-03
ITRM960394A0 (en) 1996-06-05
CN1058117C (en) 2000-11-01
ZA964876B (en) 1997-01-07
BR9602624A (en) 1998-04-22
JP2003204230A (en) 2003-07-18
CN1140931A (en) 1997-01-22
US5673001A (en) 1997-09-30

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