GB1219770A - Improvements in or relating to variable attenuators - Google Patents

Improvements in or relating to variable attenuators

Info

Publication number
GB1219770A
GB1219770A GB2463367A GB2463367A GB1219770A GB 1219770 A GB1219770 A GB 1219770A GB 2463367 A GB2463367 A GB 2463367A GB 2463367 A GB2463367 A GB 2463367A GB 1219770 A GB1219770 A GB 1219770A
Authority
GB
United Kingdom
Prior art keywords
diodes
diode
circuit
impedance
conducting
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
GB2463367A
Inventor
John Ernest Cross
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.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB2463367A priority Critical patent/GB1219770A/en
Priority to NL6806406A priority patent/NL6806406A/xx
Priority to BE715175D priority patent/BE715175A/xx
Priority to FR1566054D priority patent/FR1566054A/fr
Publication of GB1219770A publication Critical patent/GB1219770A/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
    • H03H7/253—Frequency- independent attenuators comprising an element controlled by an electric or magnetic variable the element being a diode
    • 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

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

Abstract

1,219,770. Variable attenuators. PLESSEY CO. Ltd. 29 April, 1968 [26 May, 1967], No. 24633/67. Heading H3T. Variable attenuator circuit, e.g. for an a.g.c. circuit, comprises a pi-network including pin diodes 1, 2 and 3, supplied with a control voltage from terminal HT which can be varied to differentially vary the impedance of diode 1 relative the impedance of diodes 2 and 3. A small negative bias voltage is applied to terminal 4 to ensure that all the diodes are not cut off at the same time when the control voltage changes through earth potential, and the diode 8 equalizes the loading on the control line between the state where only the single series diode is conducting and the state where the two shunt diodes are conducting. Chokers 5,9 and 11 isolate the control circuit from the A.C. signal.
GB2463367A 1967-05-26 1967-05-26 Improvements in or relating to variable attenuators Expired GB1219770A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB2463367A GB1219770A (en) 1967-05-26 1967-05-26 Improvements in or relating to variable attenuators
NL6806406A NL6806406A (en) 1967-05-26 1968-05-06
BE715175D BE715175A (en) 1967-05-26 1968-05-15
FR1566054D FR1566054A (en) 1967-05-26 1968-05-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2463367A GB1219770A (en) 1967-05-26 1967-05-26 Improvements in or relating to variable attenuators

Publications (1)

Publication Number Publication Date
GB1219770A true GB1219770A (en) 1971-01-20

Family

ID=10214792

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2463367A Expired GB1219770A (en) 1967-05-26 1967-05-26 Improvements in or relating to variable attenuators

Country Status (4)

Country Link
BE (1) BE715175A (en)
FR (1) FR1566054A (en)
GB (1) GB1219770A (en)
NL (1) NL6806406A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2304058C3 (en) * 1973-01-27 1980-01-10 Blaupunkt-Werke Gmbh, 3200 Hildesheim Adjustable aperiodic high frequency input stage

Also Published As

Publication number Publication date
BE715175A (en) 1968-09-30
FR1566054A (en) 1969-05-02
NL6806406A (en) 1968-11-27

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