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GB1517163A - Class a amplifier - Google Patents

Class a amplifier

Info

Publication number
GB1517163A
GB1517163A GB3485274A GB3485274A GB1517163A GB 1517163 A GB1517163 A GB 1517163A GB 3485274 A GB3485274 A GB 3485274A GB 3485274 A GB3485274 A GB 3485274A GB 1517163 A GB1517163 A GB 1517163A
Authority
GB
United Kingdom
Prior art keywords
signal
transistors
transistor
current
common
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.)
Expired
Application number
GB3485274A
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Priority to GB3485274A priority Critical patent/GB1517163A/en
Publication of GB1517163A publication Critical patent/GB1517163A/en
Expired 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
    • H03F3/26—Push-pull amplifiers; Phase-splitters therefor
    • 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
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45112—Indexing scheme relating to differential amplifiers the biasing of the differential amplifier being controlled from the input or the output signal
    • 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
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45466—Indexing scheme relating to differential amplifiers the CSC being controlled, e.g. by a signal derived from a non specified place in the dif amp circuit
    • 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
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45471—Indexing scheme relating to differential amplifiers the CSC comprising one or more extra current sources

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

1517163 Amplifiers POST OFFICE 18 Sept 1975 [7 Aug 1974] 34852/74 Heading H3T A Class A push-pull amplifier with increased efficiency, comprises two amplifying devices 3, 4 having their input electrodes connected to input terminals 1, 2 respectively, and their output electrodes coupled by a load circuit 8, and means for controlling the total supply current for the devices to have a component proportional to the input signal after full wave rectification. Devices 3, 4 may be either transistors in common collector configuration, as shown, or transistors in common emitter configuration, Fig. I (not shown), or thermionic valves (not illustrated) in common anode or common cathode configuration. The controlling means may comprise a transistor 9 with its base receiving the signal after passing through a differential amplifier 12, a bridge rectifier 13, and a further amplifier 14. The rectified waveform, Fig. 3b (not shown), turns on transistor 9 during both positive and negative half-cycles of the signal waveform, Fig. 3a (not shown). A standing component of current may be provided either by a transistor 18, or by applying to the output terminal of bridge 13 which is normally connected to supply line 10 an additional D.C. bias established by at least one diode (25-27), Fig. 4 (not shown), which may be a Zener diode. In an alternative circuit for providing a standing component of current differential amplifier 12 is replaced by one (31) Fig. 5 (not shown), having its output balanced about a terminal which can receive a D.C. bias. Both full wave rectification of the signal and current control are effected by two transistors (29, 30) in parallel.
GB3485274A 1975-09-18 1975-09-18 Class a amplifier Expired GB1517163A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3485274A GB1517163A (en) 1975-09-18 1975-09-18 Class a amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3485274A GB1517163A (en) 1975-09-18 1975-09-18 Class a amplifier

Publications (1)

Publication Number Publication Date
GB1517163A true GB1517163A (en) 1978-07-12

Family

ID=10370704

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3485274A Expired GB1517163A (en) 1975-09-18 1975-09-18 Class a amplifier

Country Status (1)

Country Link
GB (1) GB1517163A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2448254A1 (en) * 1979-02-02 1980-08-29 Siemens Ag HIGH FREQUENCY PULSE AMPLIFIER
FR2474252A1 (en) * 1980-01-21 1981-07-24 Philips Nv CLASS B AMPLIFIER
GB2163311A (en) * 1984-08-17 1986-02-19 Philips Electronic Associated Bipolar transistor rf power amplifier
EP0173370A1 (en) * 1984-08-20 1986-03-05 Koninklijke Philips Electronics N.V. Amplifier arrangement
EP0275940A2 (en) * 1987-01-22 1988-07-27 Siemens Aktiengesellschaft Differential amplifier with controllable power consumption
EP0351709A2 (en) * 1988-07-21 1990-01-24 Siemens Aktiengesellschaft Differential amplifier with controllable power consumption
EP0351708A2 (en) * 1988-07-21 1990-01-24 Siemens Aktiengesellschaft Differential amplifier with controllable power consumption
EP0473166A1 (en) * 1990-08-30 1992-03-04 Sanyo Electric Co., Limited. Amplifying circuit
US5726604A (en) * 1992-09-16 1998-03-10 Sgs-Thomson Microelectronics, S.R.L. Differential transconductor stage dynamically controlled by the input signal's amplitude
EP0901220A1 (en) * 1997-09-03 1999-03-10 Canon Kabushiki Kaisha Operational amplifier

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2448254A1 (en) * 1979-02-02 1980-08-29 Siemens Ag HIGH FREQUENCY PULSE AMPLIFIER
FR2474252A1 (en) * 1980-01-21 1981-07-24 Philips Nv CLASS B AMPLIFIER
GB2163311A (en) * 1984-08-17 1986-02-19 Philips Electronic Associated Bipolar transistor rf power amplifier
EP0173370A1 (en) * 1984-08-20 1986-03-05 Koninklijke Philips Electronics N.V. Amplifier arrangement
EP0275940A2 (en) * 1987-01-22 1988-07-27 Siemens Aktiengesellschaft Differential amplifier with controllable power consumption
EP0275940A3 (en) * 1987-01-22 1989-05-17 Siemens Aktiengesellschaft Berlin Und Munchen Differential amplifier with controllable power consumption
EP0351709A2 (en) * 1988-07-21 1990-01-24 Siemens Aktiengesellschaft Differential amplifier with controllable power consumption
EP0351708A2 (en) * 1988-07-21 1990-01-24 Siemens Aktiengesellschaft Differential amplifier with controllable power consumption
EP0351708A3 (en) * 1988-07-21 1990-11-14 Siemens Aktiengesellschaft Differential amplifier with controllable power consumption
EP0351709A3 (en) * 1988-07-21 1990-11-14 Siemens Aktiengesellschaft Differential amplifier with controllable power consumption
EP0473166A1 (en) * 1990-08-30 1992-03-04 Sanyo Electric Co., Limited. Amplifying circuit
US5196807A (en) * 1990-08-30 1993-03-23 Sanyo Electric Co., Ltd. Amplifying circuit
US5726604A (en) * 1992-09-16 1998-03-10 Sgs-Thomson Microelectronics, S.R.L. Differential transconductor stage dynamically controlled by the input signal's amplitude
EP0901220A1 (en) * 1997-09-03 1999-03-10 Canon Kabushiki Kaisha Operational amplifier
US6215357B1 (en) 1997-09-03 2001-04-10 Canon Kabushiki Kaisha Operational amplifier

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee