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GB1117334A - Variable gain amplifier circuit - Google Patents

Variable gain amplifier circuit

Info

Publication number
GB1117334A
GB1117334A GB4584565A GB4584565A GB1117334A GB 1117334 A GB1117334 A GB 1117334A GB 4584565 A GB4584565 A GB 4584565A GB 4584565 A GB4584565 A GB 4584565A GB 1117334 A GB1117334 A GB 1117334A
Authority
GB
United Kingdom
Prior art keywords
circuit
switch
resistor
resistors
switched
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
GB4584565A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1117334A publication Critical patent/GB1117334A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0088—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using discontinuously variable devices, e.g. switch-operated
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/72—Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control
    • H03G3/04—Manually-operated control in untuned amplifiers
    • H03G3/10—Manually-operated control in untuned amplifiers having semiconductor devices
    • 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
    • H03G3/34—Muting amplifier when no signal is present

Landscapes

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

Abstract

1,117,334. Transistor amplifying and gating Circuits. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. 29 Oct., 1965 [7 Nov., 1964], No. 45845/65. Heading H3T. The gain of an amplifier is switched from one value to another by means of a network comprising resistors carrying D.C., being arranged so that the D.C. conditions in the circuit are not changed. In one embodiment comprising a transistor amplifier with input applied to base and output from the collector circuit, the emitter circuit comprises two series-connected resistors 61, 62 with a switch 7, whereby the resistor 62 can be shorted out: the switch 7 is connected to a point-U h whose potential is the same as that of the common point of resistors 61, 62. In other embodiments, the switch is used to connect a second resistor in parallel with an emitter circuit resistor (Fig. 3, not shown) or the collector circuit loads are switched (Figs. 2, 4, not shown). In push-pull embodiments (Figs. 5-8, not shown) comprising similar pairs of amplifiers, it is only necessary to connect the switch between like points in the circuit. The Specification also describes a circuit of the last type in which diodes are used as switches (Fig. 9, not shown), a bridge network being employed to which switching voltages of constant amplitude are applied by means of a Zener diode.
GB4584565A 1964-11-07 1965-10-29 Variable gain amplifier circuit Expired GB1117334A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET27385A DE1218525B (en) 1964-11-07 1964-11-07 Amplifier with switchable gain

Publications (1)

Publication Number Publication Date
GB1117334A true GB1117334A (en) 1968-06-19

Family

ID=7553453

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4584565A Expired GB1117334A (en) 1964-11-07 1965-10-29 Variable gain amplifier circuit

Country Status (2)

Country Link
DE (1) DE1218525B (en)
GB (1) GB1117334A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1298124A (en) * 1969-05-01 1972-11-29 Sony Corp Transistor circuits
JPS5873286A (en) * 1981-10-27 1983-05-02 Matsushita Electric Ind Co Ltd angle modulation circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1116724B (en) * 1960-04-27 1961-11-09 Siemens Ag Read amplifier for matrix memory

Also Published As

Publication number Publication date
DE1218525B (en) 1966-06-08

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