GB1294108A - Use of an electronic circuit forming a non-linear and variable impedance - Google Patents

Use of an electronic circuit forming a non-linear and variable impedance

Info

Publication number
GB1294108A
GB1294108A GB62713/69A GB6271369A GB1294108A GB 1294108 A GB1294108 A GB 1294108A GB 62713/69 A GB62713/69 A GB 62713/69A GB 6271369 A GB6271369 A GB 6271369A GB 1294108 A GB1294108 A GB 1294108A
Authority
GB
United Kingdom
Prior art keywords
control
gain control
current
diagonal
dec
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
GB62713/69A
Inventor
Stefan Kudelski
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB1294108A publication Critical patent/GB1294108A/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
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0052—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using diodes

Landscapes

  • Digital Magnetic Recording (AREA)
  • Amplifiers (AREA)
  • Networks Using Active Elements (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

1294108 Gain control S KUDELSKI 23 Dec 1969 [26 Dec 1968] 62713/69 Heading H4R The impedance across one diagonal AB of a bridge network of diodes 10, fed with a D.C. control current across the other diagonal, is used as the shunt element in an attenuator feeding an amplifier 13, in order to provide gain control and compensation for non linearity in, e.g. a magnetic recording system. As shown the gain control voltage is applied to terminals 17, and difference in the threshold voltages of the PNP and NPN transistors is provided by resistor 12. In an alternative method of supplying the D.C. control current, Fig. 4 (not shown), the bridge network is connected in series with one transistor of a long tailed pair whose total current is stabilized by constant current sources (X) arranged in the common emitter and common collector circuits of the pair, to provide control over a wide gain range.
GB62713/69A 1968-12-26 1969-12-23 Use of an electronic circuit forming a non-linear and variable impedance Expired GB1294108A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1929068A CH505505A (en) 1968-12-26 1968-12-26 Use of an electronic circuit constituting a non-linear and variable impedance

Publications (1)

Publication Number Publication Date
GB1294108A true GB1294108A (en) 1972-10-25

Family

ID=4438533

Family Applications (1)

Application Number Title Priority Date Filing Date
GB62713/69A Expired GB1294108A (en) 1968-12-26 1969-12-23 Use of an electronic circuit forming a non-linear and variable impedance

Country Status (5)

Country Link
US (1) US3681625A (en)
CH (1) CH505505A (en)
DE (1) DE1965099B2 (en)
FR (1) FR2027130A1 (en)
GB (1) GB1294108A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5412714A (en) * 1977-06-29 1979-01-30 Matsushita Electric Ind Co Ltd Recorder-reproducer
US4401940A (en) * 1982-09-30 1983-08-30 Harris Corporation Voltage equalizer bridge

Also Published As

Publication number Publication date
DE1965099A1 (en) 1970-07-09
US3681625A (en) 1972-08-01
DE1965099B2 (en) 1974-08-01
CH505505A (en) 1971-03-31
FR2027130A1 (en) 1970-09-25
DE1965099C3 (en) 1975-06-05

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee