GB1233980A - - Google Patents

Info

Publication number
GB1233980A
GB1233980A GB1233980DA GB1233980A GB 1233980 A GB1233980 A GB 1233980A GB 1233980D A GB1233980D A GB 1233980DA GB 1233980 A GB1233980 A GB 1233980A
Authority
GB
United Kingdom
Prior art keywords
transistor
circuit
june
series
variable impedance
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 GB1233980A publication Critical patent/GB1233980A/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
    • 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
    • H03G1/0082—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using bipolar transistor-type devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/46—One-port networks

Landscapes

  • Networks Using Active Elements (AREA)
  • Amplifiers (AREA)

Abstract

1,233,980. Variable impedance circuit. SIEMENS A.G. 26 June, 1969 [27 June, 1968], No. 32254/69. Heading H4R. In a variable impedance circuit, Fig. 1, suitable for use in a compander, the impedance presented by a tertiary winding L3 to an external circuit is controlled by varying the base bias of a transistor T1 connected, in series with a reversed biased Zener diode Z, between the primary L1 and secondary L2 windings of the transformer. The linearity of such a circuit can be improved by the arrangement according to the invention, Fig. 2, in which a second transistor T2, complementary to T1, is connected in series with further primary and secondary windings L1<SP>1 </SP>and L2<SP>1</SP> and fed with the voltage developed across the resistor R2 in the first transistor circuit so as to carry a current similar, but of opposite phase, to that carried by transistor T1. The diode D provides compensation for the threshold voltage of the transistor T2.
GB1233980D 1968-06-27 1969-06-26 Expired GB1233980A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681762493 DE1762493B2 (en) 1968-06-27 1968-06-27 CONTROLLABLE RESISTANCE ARRANGEMENT IN PARTICULAR FOR CONTROL CIRCUITS WITH LARGE REGULATORY STABILITY

Publications (1)

Publication Number Publication Date
GB1233980A true GB1233980A (en) 1971-06-03

Family

ID=5697037

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1233980D Expired GB1233980A (en) 1968-06-27 1969-06-26

Country Status (5)

Country Link
JP (1) JPS4944066B1 (en)
DE (1) DE1762493B2 (en)
GB (1) GB1233980A (en)
NL (1) NL147295B (en)
SE (1) SE344397B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5357567U (en) * 1976-10-15 1978-05-17

Also Published As

Publication number Publication date
DE1762493A1 (en) 1971-03-04
DE1762493B2 (en) 1972-01-20
NL147295B (en) 1975-09-15
NL6909168A (en) 1969-12-30
SE344397B (en) 1972-04-10
JPS4944066B1 (en) 1974-11-26

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Legal Events

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