GB0029419D0 - Power amplifier control circuit - Google Patents

Power amplifier control circuit

Info

Publication number
GB0029419D0
GB0029419D0 GB0029419A GB0029419A GB0029419D0 GB 0029419 D0 GB0029419 D0 GB 0029419D0 GB 0029419 A GB0029419 A GB 0029419A GB 0029419 A GB0029419 A GB 0029419A GB 0029419 D0 GB0029419 D0 GB 0029419D0
Authority
GB
United Kingdom
Prior art keywords
control circuit
power amplifier
amplifier control
power
circuit
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.)
Withdrawn
Application number
GB0029419A
Other versions
GB2369734A (en
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.)
Roke Manor Research Ltd
Original Assignee
Roke Manor Research Ltd
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 Roke Manor Research Ltd filed Critical Roke Manor Research Ltd
Priority to GB0029419A priority Critical patent/GB2369734A/en
Publication of GB0029419D0 publication Critical patent/GB0029419D0/en
Publication of GB2369734A publication Critical patent/GB2369734A/en
Withdrawn legal-status Critical Current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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/345—Negative-feedback-circuit arrangements with or without positive feedback using hybrid or directional couplers
    • 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
    • H03F1/0261—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 polarisation voltage or current, e.g. gliding Class A
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/204—A hybrid coupler being used at the output of an amplifier circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/207—A hybrid coupler being used as power measuring circuit at the output of an amplifier circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
GB0029419A 2000-12-02 2000-12-02 Improving the linearity and efficiency of an amplifier by adjusting a bias current in accordance with leakage to an adjacent channel Withdrawn GB2369734A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0029419A GB2369734A (en) 2000-12-02 2000-12-02 Improving the linearity and efficiency of an amplifier by adjusting a bias current in accordance with leakage to an adjacent channel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0029419A GB2369734A (en) 2000-12-02 2000-12-02 Improving the linearity and efficiency of an amplifier by adjusting a bias current in accordance with leakage to an adjacent channel

Publications (2)

Publication Number Publication Date
GB0029419D0 true GB0029419D0 (en) 2001-01-17
GB2369734A GB2369734A (en) 2002-06-05

Family

ID=9904319

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0029419A Withdrawn GB2369734A (en) 2000-12-02 2000-12-02 Improving the linearity and efficiency of an amplifier by adjusting a bias current in accordance with leakage to an adjacent channel

Country Status (1)

Country Link
GB (1) GB2369734A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2389275B (en) 2002-05-31 2006-10-25 Hitachi Ltd Apparatus for mobile communication system
GB2406985A (en) * 2003-10-07 2005-04-13 Software Radio Technology Ltd An RF transmitter with optimal control of amplifier bias with respect to efficiency and adjacent channel power
EP1601096A1 (en) * 2004-05-27 2005-11-30 Alcatel Bias voltage adjusting method and electronic loop circuit
US7605652B2 (en) * 2005-08-05 2009-10-20 Freescale Semiconductor, Inc. Loop gain equalizer for RF power amplifier
US8913970B2 (en) 2010-09-21 2014-12-16 Apple Inc. Wireless transceiver with amplifier bias adjusted based on modulation scheme
US8738066B2 (en) 2010-10-07 2014-05-27 Apple Inc. Wireless transceiver with amplifier bias adjusted based on modulation scheme and transmit power feedback
US9655069B2 (en) 2011-09-09 2017-05-16 Vixs Systems, Inc. Dynamic transmitter calibration
DE102012203026A1 (en) 2012-02-28 2013-08-29 Sennheiser Electronic Gmbh & Co. Kg RF transmitter
DE102015208490A1 (en) 2015-05-07 2016-11-10 Sennheiser Electronic Gmbh & Co. Kg High-frequency transmitter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6112059A (en) * 1997-11-12 2000-08-29 Motorola, Inc. Off-channel leakage power monitor apparatus and method

Also Published As

Publication number Publication date
GB2369734A (en) 2002-06-05

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)