GB2010616A - Gain controlled amplifier with variable frequency response - Google Patents

Gain controlled amplifier with variable frequency response

Info

Publication number
GB2010616A
GB2010616A GB7848607A GB7848607A GB2010616A GB 2010616 A GB2010616 A GB 2010616A GB 7848607 A GB7848607 A GB 7848607A GB 7848607 A GB7848607 A GB 7848607A GB 2010616 A GB2010616 A GB 2010616A
Authority
GB
United Kingdom
Prior art keywords
gain
frequency response
differential pair
amplifier
virtual
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
GB7848607A
Other versions
GB2010616B (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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB2010616A publication Critical patent/GB2010616A/en
Application granted granted Critical
Publication of GB2010616B publication Critical patent/GB2010616B/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
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • H03G1/0023—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier in emitter-coupled or cascode amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H03G9/12—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having semiconductor devices
    • H03G9/14—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having semiconductor devices for gain control and tone control
    • H03G9/16—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having semiconductor devices for gain control and tone control incorporating negative feedback

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Networks Using Active Elements (AREA)

Abstract

A gain-controllable amplifier with the frequency response of which varies with gain and which may be used as a physiological volume control circuit comprises two virtual-earth amplifiers connected in parallel. Each amplifier includes a differential pair gain control circuit (T1, T2 and T3, T4 respectively) which pairs are cross-connected. The feedback impedance (Z) of one virtual- earth amplifier is frequency- dependent, and a variable gain control voltage (UST) is applied between the bases of the transistors of each pair. In order to be able to obtain a large gain variation range with the frequency response varying to a considerable extent over a large part of this range, one differential pair (T3, T4) is shunted by a further transistor (T7) which itself is fed with an independently variable control voltage (Usth). A further controlled differential pair (T8, T9) may be provided to keep the d.c. conditions constant. <IMAGE>
GB7848607A 1977-12-15 1978-12-14 Circuit arrangement having a variable frequency response Expired GB2010616B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772755827 DE2755827A1 (en) 1977-12-15 1977-12-15 CIRCUIT ARRANGEMENT WITH A FREQUENCY RESPONSE THAT CAN BE CHANGED BY A CONTROL VOLTAGE

Publications (2)

Publication Number Publication Date
GB2010616A true GB2010616A (en) 1979-06-27
GB2010616B GB2010616B (en) 1982-04-21

Family

ID=6026151

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7848607A Expired GB2010616B (en) 1977-12-15 1978-12-14 Circuit arrangement having a variable frequency response

Country Status (5)

Country Link
JP (1) JPS5489551A (en)
AT (1) AT376078B (en)
DE (1) DE2755827A1 (en)
FR (1) FR2412200A1 (en)
GB (1) GB2010616B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2465369A1 (en) * 1979-09-13 1981-03-20 Thomson Csf Mixer circuit for volume and tone control circuit - has two parallel connected differential amplifiers responsive to three control signals and providing increased signal=to=noise ratio
EP0145976A2 (en) * 1983-12-14 1985-06-26 Tektronix, Inc. High speed multiplying digital to analog converter
EP0166973A1 (en) * 1984-06-07 1986-01-08 Siemens Aktiengesellschaft Differential amplifier

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3026551A1 (en) * 1980-07-12 1982-02-04 Philips Patentverwaltung Gmbh, 2000 Hamburg AMPLIFIER CIRCUIT
US4471320A (en) * 1981-05-27 1984-09-11 Frey Douglas R Voltage controlled element
US4528515A (en) * 1983-02-07 1985-07-09 Tektronix, Inc. High frequency differential amplifier with adjustable damping factor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2262089C3 (en) * 1972-12-19 1975-10-30 Philips Patentverwaltung Gmbh, 2000 Hamburg Circuit arrangement for electronic frequency influencing, in particular electronic sound adjuster

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2465369A1 (en) * 1979-09-13 1981-03-20 Thomson Csf Mixer circuit for volume and tone control circuit - has two parallel connected differential amplifiers responsive to three control signals and providing increased signal=to=noise ratio
EP0145976A2 (en) * 1983-12-14 1985-06-26 Tektronix, Inc. High speed multiplying digital to analog converter
EP0145976A3 (en) * 1983-12-14 1988-06-08 Tektronix, Inc. High speed multiplying digital to analog converter
EP0166973A1 (en) * 1984-06-07 1986-01-08 Siemens Aktiengesellschaft Differential amplifier

Also Published As

Publication number Publication date
DE2755827A1 (en) 1979-06-21
ATA898778A (en) 1984-02-15
FR2412200A1 (en) 1979-07-13
FR2412200B1 (en) 1984-03-23
JPS5489551A (en) 1979-07-16
GB2010616B (en) 1982-04-21
AT376078B (en) 1984-10-10

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee