CA2202464A1 - Am-fm transmitter power amplifier using class-bc - Google Patents

Am-fm transmitter power amplifier using class-bc

Info

Publication number
CA2202464A1
CA2202464A1 CA002202464A CA2202464A CA2202464A1 CA 2202464 A1 CA2202464 A1 CA 2202464A1 CA 002202464 A CA002202464 A CA 002202464A CA 2202464 A CA2202464 A CA 2202464A CA 2202464 A1 CA2202464 A1 CA 2202464A1
Authority
CA
Canada
Prior art keywords
amplifiers
load
amplifier
power
different
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
CA002202464A
Other languages
French (fr)
Other versions
CA2202464C (en
Inventor
Paul W. Dent
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.)
Ericsson Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2202464A1 publication Critical patent/CA2202464A1/en
Application granted granted Critical
Publication of CA2202464C publication Critical patent/CA2202464C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/60—Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators
    • H03F3/602—Combinations of several amplifiers
    • 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
    • H03F1/0244—Stepped control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/516—Some amplifier stages of an amplifier use supply voltages of different value
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/541—Transformer coupled at the output of an amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/30—Indexing scheme relating to single-ended push-pull [SEPP]; Phase-splitters therefor
    • H03F2203/30048—Indexing scheme relating to single-ended push-pull [SEPP]; Phase-splitters therefor the SEPP amplifier has multiple SEPP outputs from paralleled output stages coupled in one or more outputs

Abstract

A power amplifier circuit for efficiently generating an output signal into a load at more than one alternative power level has at least two amplifiers, each having optimum efficiency at different power output levels. The power amplifier circuit may be operated in several modes, including activating one amplifier during an entire cycle of an input signal to be amplified, or alternatively activating one amplifier based on a control signal that is independent of the amplified output signal. In either case, remaining amplifiers are deactivated. - Coupling between the amplifiers prevents deactivated amplifiers from impeding the flow of power from the activated amplifier to the load. In another aspect of the invention, optimum efficiency at different power output levels is achieved by means of coupling each amplifier to a common power source and to the load via a impedance matching circuit, the impedance transformation being different for different amplifiers. The impedance matching circuit may comprise a push-pull transformer having taps to provide different turns ratios between respective amplifiers and the load. Alternatively, the matching circuit may comprise a number of quarter-wavelength lines each coupled at one end to the load and at the other end to one of the amplifiers via a balun.
CA002202464A 1994-10-12 1995-10-10 Am-fm transmitter power amplifier using class-bc Expired - Fee Related CA2202464C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/321,446 1994-10-12
US08/321,446 US5570062A (en) 1994-10-12 1994-10-12 AM-FM transmitter power amplifier using class-BC
PCT/US1995/012485 WO1996012342A1 (en) 1994-10-12 1995-10-10 Am-fm transmitter power amplifier using class-bc

Publications (2)

Publication Number Publication Date
CA2202464A1 true CA2202464A1 (en) 1996-04-25
CA2202464C CA2202464C (en) 2005-06-28

Family

ID=23250646

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002202464A Expired - Fee Related CA2202464C (en) 1994-10-12 1995-10-10 Am-fm transmitter power amplifier using class-bc

Country Status (11)

Country Link
US (2) US5570062A (en)
EP (1) EP0787381B1 (en)
KR (1) KR100376081B1 (en)
CN (1) CN1063892C (en)
AU (1) AU691363B2 (en)
BR (1) BR9509325A (en)
CA (1) CA2202464C (en)
DE (1) DE69522335T2 (en)
FI (1) FI971515A (en)
MX (1) MX9702579A (en)
WO (1) WO1996012342A1 (en)

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US6864668B1 (en) 1999-02-09 2005-03-08 Tropian, Inc. High-efficiency amplifier output level and burst control
US6377784B2 (en) 1999-02-09 2002-04-23 Tropian, Inc. High-efficiency modulation RF amplifier
US6366177B1 (en) 2000-02-02 2002-04-02 Tropian Inc. High-efficiency power modulators
US6294955B1 (en) * 2000-04-07 2001-09-25 Harris Corporation Apparatus and method for use in disconnecting and/or replacing one of a plurality of power amplifiers in a transmitter while the transmitter is operating
EP1358709A2 (en) * 2001-02-06 2003-11-05 Harman International Industries, Inc. Half-bridge gate driver circuit
US6472936B1 (en) * 2001-05-14 2002-10-29 National Semiconductor Corporation Low-noise gain switching circuit using tapped inductor
US6665525B2 (en) 2001-05-29 2003-12-16 Ericsson Inc. High-level modulation method and apparatus
US6545541B2 (en) 2001-05-29 2003-04-08 Ericsson Inc. Power amplifier embedded cell bias detection, methods of detecting bias in power amplifiers and systems utilizing embedded cell bias detection
US20040100376A1 (en) * 2002-11-26 2004-05-27 Kimberly-Clark Worldwide, Inc. Healthcare monitoring system
US7889787B2 (en) * 2003-08-04 2011-02-15 Supertex, Inc. Ultrasound transmit beamformer integrated circuit and method
US7129784B2 (en) * 2004-10-28 2006-10-31 Broadcom Corporation Multilevel power amplifier architecture using multi-tap transformer
KR101126411B1 (en) 2004-12-31 2012-03-28 삼성전자주식회사 Fully Integrated Efficiency Enhanced Small Form Factor CMOS Power Amplifier
US7764210B2 (en) * 2006-12-20 2010-07-27 Texas Instruments Incorporated System and method for converting an input signal
US7728661B2 (en) * 2008-05-05 2010-06-01 Javelin Semiconductor, Inc. Controlling power with an output network
US7768350B2 (en) * 2008-12-30 2010-08-03 Javelin Semiconductor, Inc. Output gain stage for a power amplifier
EP2226932B1 (en) 2009-03-02 2013-10-16 Alcatel Lucent Method for amplifying a signal by a power amplifier, power amplifier system, device, computer program product, and digital storage medium thereof
TWI458174B (en) 2009-05-19 2014-10-21 Marvell World Trade Ltd Circuits and methods combining signal power
US8786381B2 (en) 2010-06-28 2014-07-22 Avago Technologies General Ip (Singapore) Pte. Ltd. Transformer structures for a power amplifier (PA)
JP5989578B2 (en) * 2013-03-14 2016-09-07 株式会社東芝 High frequency broadband amplifier circuit
JP5727561B2 (en) * 2013-08-29 2015-06-03 住友電気工業株式会社 Transformer
JP5695782B1 (en) 2013-09-12 2015-04-08 住友電気工業株式会社 Transformer
JP6297963B2 (en) 2014-11-05 2018-03-20 住友電気工業株式会社 Transformer
JP6359950B2 (en) 2014-11-05 2018-07-18 住友電気工業株式会社 Transformer
CN104851425B (en) * 2015-05-30 2018-11-30 宁波摩米创新工场电子科技有限公司 A kind of high definition speech recognition system based on symmetrical transistor amplifier

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Also Published As

Publication number Publication date
US5652546A (en) 1997-07-29
CN1063892C (en) 2001-03-28
FI971515A (en) 1997-06-09
US5570062A (en) 1996-10-29
EP0787381A1 (en) 1997-08-06
WO1996012342A1 (en) 1996-04-25
AU3945395A (en) 1996-05-06
BR9509325A (en) 1997-10-14
KR100376081B1 (en) 2003-06-11
CA2202464C (en) 2005-06-28
DE69522335D1 (en) 2001-09-27
FI971515A0 (en) 1997-04-11
EP0787381B1 (en) 2001-08-22
DE69522335T2 (en) 2002-05-08
AU691363B2 (en) 1998-05-14
CN1168749A (en) 1997-12-24
MX9702579A (en) 1997-07-31

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