GB1119703A - Improvements in or relating to high frequency variable attenuators - Google Patents

Improvements in or relating to high frequency variable attenuators

Info

Publication number
GB1119703A
GB1119703A GB3970764A GB3970764A GB1119703A GB 1119703 A GB1119703 A GB 1119703A GB 3970764 A GB3970764 A GB 3970764A GB 3970764 A GB3970764 A GB 3970764A GB 1119703 A GB1119703 A GB 1119703A
Authority
GB
United Kingdom
Prior art keywords
output
varactors
amplifier
fed
variable
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
GB3970764A
Inventor
Kenneth Geoffrey Baker
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi 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 Marconi Co Ltd filed Critical Marconi Co Ltd
Priority to GB3970764A priority Critical patent/GB1119703A/en
Publication of GB1119703A publication Critical patent/GB1119703A/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
    • H03G1/0064—Variable capacitance diodes

Landscapes

  • Networks Using Active Elements (AREA)

Abstract

1,119,703. Gain control. MARCONI CO. Ltd. 22 July, 1965 [30 Sept., 1964], No. 39707/64. Heading H3Q. [Also in Division H1] A variable gain control circuit comprises a 3db directional coupler (e.g. that described in Specification 989,271) having input and output connected to diagonally opposite ports 2, 3<SP>1</SP> and electrically variable loads 4 (e.g. varactor diodes) connected to the other ports 2<SP>1</SP>, 3. The degree of mismatch of the loads determines the amount of power transmitted to the output port 3<SP>1</SP>. The output may be fed to an amplifier 9 and the gain may be controlled retroactively by means of a feedback circuit comprising a rectifier 10 and a D.C. amplifier 11. In a modification (Fig. 4, not shown), the input consists of an I.F. signal and the output is fed to a R.F. converter. Each variable load 4 may comprise a single varactor, two varactors arranged back-to-back or two pairs of varactors with one pair back-to-back with the other. The varactors may be in series or shunt connection with resistive elements.
GB3970764A 1964-09-30 1964-09-30 Improvements in or relating to high frequency variable attenuators Expired GB1119703A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3970764A GB1119703A (en) 1964-09-30 1964-09-30 Improvements in or relating to high frequency variable attenuators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3970764A GB1119703A (en) 1964-09-30 1964-09-30 Improvements in or relating to high frequency variable attenuators

Publications (1)

Publication Number Publication Date
GB1119703A true GB1119703A (en) 1968-07-10

Family

ID=10411037

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3970764A Expired GB1119703A (en) 1964-09-30 1964-09-30 Improvements in or relating to high frequency variable attenuators

Country Status (1)

Country Link
GB (1) GB1119703A (en)

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