GB1189010A - Improvements in Transistorised Power Amplifiers - Google Patents

Improvements in Transistorised Power Amplifiers

Info

Publication number
GB1189010A
GB1189010A GB3492367A GB3492367A GB1189010A GB 1189010 A GB1189010 A GB 1189010A GB 3492367 A GB3492367 A GB 3492367A GB 3492367 A GB3492367 A GB 3492367A GB 1189010 A GB1189010 A GB 1189010A
Authority
GB
United Kingdom
Prior art keywords
transistors
circuit
collector
transformer
transistor
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
GB3492367A
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Publication of GB1189010A publication Critical patent/GB1189010A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F3/00Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/211Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F2200/00Indexing scheme relating to amplifiers
    • H03F2200/417A switch coupled in the output circuit of an amplifier being controlled by a circuit
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F2200/00Indexing scheme relating to amplifiers
    • H03F2200/541Transformer coupled at the output of an amplifier

Landscapes

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

Abstract

1,189,010. Transistor power amplifiers. COMPAGNIE FRANCAISE THOMSON-HOUSTON-HOTCHKISS BRANDT. 28 July, 1967 [29 July, 1966], No. 34923/67. Heading H3T. [Also in Division H1] In a power amplifier, comprising at least one power stage having a plurality of transistors 1-6 connected and fed in parallel and being simultaneously driven by an input signal applied to a common input terminal 7 connected to similar electrodes of the transistors, a transformer 18 is provided having a single secondary winding connectible to a load and a plurality of primary windings 21-26 corresponding in number to the transistors and each primary winding is connected to the output electrode of a different one of the transistors. The circuit shown is a power amplifier of a transmitter feeding an aerial 27 which is tuned by capacitor or inductor 20. Protection resistors 41-46 are provided in the collector circuit of each transistor to prevent thermal runaway and to limit their collector current as does resistor 29 which is switched out of circuit by switch 30 when the amplifier is receiving a signal which may be low, very high or ultra-high frequency. The parasitic admittance between the collector and base of the transistors may be neutralized by connecting an impedance 40 between the output and input of the amplifier and by arranging the transformer windings so that the input and output voltages at 7 and 19 are of the same phase but of opposite phase to that at the collectors. Negative temperature coefficient resistors or thermistors can be included in the collector circuits of the transistors to regulate the circuit against temperature changes. An inductor L in anti-oscillation elements 11-16 damps oscillations which may be produced by parasitic coupling in the circuit of a transistor or between different transistors. Several amplifiers of Fig. 1 may be connected in parallel (Fig. 2, not shown). Measurement and testing.-The current flowing through each collector circuit of the transistors may be measured in turn by switching a voltmeter calibrated in current across shunt resistors 51-56 in each collector circuit. Transformer construction and circuit mounting.-The transistors are mounted on a conductive earth plate (61, Figs. 3 and 4, not shown), around a toroidal transformer which has a coaxial output (57, 58) from a single turn secondary around which the primary windings 21-26 are wound.
GB3492367A 1966-07-29 1967-07-28 Improvements in Transistorised Power Amplifiers Expired GB1189010A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR71414A FR1495534A (en) 1966-07-29 1966-07-29 Improvements to transistor power amplifiers

Publications (1)

Publication Number Publication Date
GB1189010A true GB1189010A (en) 1970-04-22

Family

ID=8614440

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3492367A Expired GB1189010A (en) 1966-07-29 1967-07-28 Improvements in Transistorised Power Amplifiers

Country Status (5)

Country Link
DE (1) DE1537591A1 (en)
ES (1) ES343518A1 (en)
FR (1) FR1495534A (en)
GB (1) GB1189010A (en)
NL (1) NL6710305A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1777814A3 (en) * 2005-10-12 2008-03-05 Peavey Electronics Corporation Methods and apparatus for switching between class A and A/B operation in a power amplifier
WO2015113069A1 (en) * 2014-01-27 2015-07-30 Texas Instruments Incorporated System, method and device for power amplification of a signal in an integrated circuit
CN106124968A (en) * 2016-08-22 2016-11-16 中国计量科学研究院 A kind of power amplifier parallel connection debugging apparatus and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1777814A3 (en) * 2005-10-12 2008-03-05 Peavey Electronics Corporation Methods and apparatus for switching between class A and A/B operation in a power amplifier
WO2015113069A1 (en) * 2014-01-27 2015-07-30 Texas Instruments Incorporated System, method and device for power amplification of a signal in an integrated circuit
US9450546B2 (en) 2014-01-27 2016-09-20 Texas Instruments Incorporated System, method and device for power amplification of a signal in an integrated circuit
CN106124968A (en) * 2016-08-22 2016-11-16 中国计量科学研究院 A kind of power amplifier parallel connection debugging apparatus and method

Also Published As

Publication number Publication date
NL6710305A (en) 1968-01-30
DE1537591A1 (en) 1969-08-28
FR1495534A (en) 1967-09-22
ES343518A1 (en) 1968-07-16

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees