GB1296741A - - Google Patents

Info

Publication number
GB1296741A
GB1296741A GB1296741DA GB1296741A GB 1296741 A GB1296741 A GB 1296741A GB 1296741D A GB1296741D A GB 1296741DA GB 1296741 A GB1296741 A GB 1296741A
Authority
GB
United Kingdom
Prior art keywords
current
impedance
network
diodes
networks
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
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 filed Critical
Publication of GB1296741A publication Critical patent/GB1296741A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • 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

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Networks Using Active Elements (AREA)

Abstract

1296741 Volume control circuits INTERNATIONAL BUSINESS MACHINES CORP 19 May 1970 [21 May 1969] 24112/70 Heading H4R A variable impedance includes a "T" network each arm of which comprises a plurality of parallel branches each including at least one unidirectional conducting device, a current generator being arranged to control the impedance of the network by feeding a current into a node. Various embodiments using diodes and transistors as unidirectionally conducting devices are described. The networks may be used as feedback paths in gain controlled amplifiers and an auxiliary network may be provided in parallel with the feedback path or in series with the amplifier to provide dynamic compensation for component characteristic variations due to changes in ambient conditions. It is also stated that the networks could be used in radio receivers or data transmission systems. As shown a feedback path for an amplifier Aop includes a balanced "T" network of diodes. The arms A, B, C and D, E, F of each "T" each comprise m, p and n-m branches each including a series of h diodes. A current generator I is arranged to cause a current to flow between the nodes of the "T" networks. The impedance of the feedback path varies generally linearly with the magnitude of the current. Mathematical theory is given showing how the impedance and current are related to the numbers m, p and n-m and shows that the choice of these numbers alters the range of current over which the impedance/current relationship is substantially linear.
GB1296741D 1969-05-21 1970-05-19 Expired GB1296741A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6915546A FR2044249A5 (en) 1969-05-21 1969-05-21

Publications (1)

Publication Number Publication Date
GB1296741A true GB1296741A (en) 1972-11-15

Family

ID=9034002

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1296741D Expired GB1296741A (en) 1969-05-21 1970-05-19

Country Status (4)

Country Link
JP (1) JPS5019022B1 (en)
DE (1) DE2024827A1 (en)
FR (1) FR2044249A5 (en)
GB (1) GB1296741A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2270594A (en) * 1992-09-09 1994-03-16 Roke Manor Research Pin diode attenuators

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52112824A (en) * 1976-03-19 1977-09-21 Kiyoshi Okumura Openining and closing switch valve for multiple aseptic pipes
FR2576725B1 (en) * 1985-01-25 1988-07-08 Thomson Csf CLASS AB AMPLIFIER AND ITS DISTORTION CORRECTOR

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2270594A (en) * 1992-09-09 1994-03-16 Roke Manor Research Pin diode attenuators
GB2270594B (en) * 1992-09-09 1996-04-10 Roke Manor Research Improvements in or relating to pin diode attenuators

Also Published As

Publication number Publication date
JPS5019022B1 (en) 1975-07-03
FR2044249A5 (en) 1971-02-19
DE2024827A1 (en) 1970-11-26

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Legal Events

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