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GB967676A - Improvements in or relating to variable-impedance electric circuits - Google Patents

Improvements in or relating to variable-impedance electric circuits

Info

Publication number
GB967676A
GB967676A GB4220961A GB4220961A GB967676A GB 967676 A GB967676 A GB 967676A GB 4220961 A GB4220961 A GB 4220961A GB 4220961 A GB4220961 A GB 4220961A GB 967676 A GB967676 A GB 967676A
Authority
GB
United Kingdom
Prior art keywords
diode
transformer
impedance
variable
nov
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
GB4220961A
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.)
JOHN EVANS PUGHE
General Electric Co PLC
Original Assignee
JOHN EVANS PUGHE
General Electric Co PLC
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 JOHN EVANS PUGHE, General Electric Co PLC filed Critical JOHN EVANS PUGHE
Priority to GB4220961A priority Critical patent/GB967676A/en
Publication of GB967676A publication Critical patent/GB967676A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/24—Frequency- independent attenuators
    • H03H7/25—Frequency- independent attenuators comprising an element controlled by an electric or magnetic variable
    • 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

  • Electronic Switches (AREA)
  • Networks Using Active Elements (AREA)

Abstract

967,676. Non-linear impedance networks; semi-conductor circuits. GENERAL ELECTRIC CO. Ltd., and J. EVANS-PUGH. Nov. 23, 1962 [Nov. 24, 1961], No. 42209/61. Headings H3T and H3U. A variable-impedance circuit comprises two pairs of terminals connected by a transformer 7 and by an element 9 having a non-linear voltagecurrent characteristic, e.g. a semi-conductor diode. The impedance of the diode 9 is controlled by the transistor 11. Under conditions of maximum attenuation some current is still passed by the diode because of its inherent capacitance. To reduce the unwanted signal, the coupling of the transformer 7 and the value of capacitance 8 are such that the signal transferred by the transformer is equal in amplitude and opposite in phase to the signal transferred by the diode. In a modified circuit, the diode is connected between terminal 1 and the lower terminal of the secondary winding 10.
GB4220961A 1961-11-24 1961-11-24 Improvements in or relating to variable-impedance electric circuits Expired GB967676A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4220961A GB967676A (en) 1961-11-24 1961-11-24 Improvements in or relating to variable-impedance electric circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4220961A GB967676A (en) 1961-11-24 1961-11-24 Improvements in or relating to variable-impedance electric circuits

Publications (1)

Publication Number Publication Date
GB967676A true GB967676A (en) 1964-08-26

Family

ID=10423334

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4220961A Expired GB967676A (en) 1961-11-24 1961-11-24 Improvements in or relating to variable-impedance electric circuits

Country Status (1)

Country Link
GB (1) GB967676A (en)

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