GB969202A - Improvements in or relating to electronic amplifiers - Google Patents

Improvements in or relating to electronic amplifiers

Info

Publication number
GB969202A
GB969202A GB1952260A GB1952260A GB969202A GB 969202 A GB969202 A GB 969202A GB 1952260 A GB1952260 A GB 1952260A GB 1952260 A GB1952260 A GB 1952260A GB 969202 A GB969202 A GB 969202A
Authority
GB
United Kingdom
Prior art keywords
bridge
arms
gain
diodes
amplifier
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
GB1952260A
Inventor
Thomas Eric Wynne
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.)
SECR AVIATION
Minister of Aviation
Original Assignee
SECR AVIATION
Minister of Aviation
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 SECR AVIATION, Minister of Aviation filed Critical SECR AVIATION
Priority to GB1952260A priority Critical patent/GB969202A/en
Publication of GB969202A publication Critical patent/GB969202A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • 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

  • Amplifiers (AREA)

Abstract

969,202. Gain Control. MINISTER OF AVIATION. Aug. 21, 1961 [June 2, 1960], No. 19522/60. Headings H3T and H4R. In order to control the gain of a transistor amplifier there is included in its signal path an attenuator in the form of a Wheatstone bridge having in at least one of its arms a variable capacitance, comprising a back-biased, semiconductor diode,- the effective value of which is dependent upon the amount of an applied D.C. bias derived.from the output of the amplifier. As described;. the arrangement is applied to, transistor amplifier comprising cascode stages SS1, SS2 in which the stage gain is controlled automatically by means of a gain control diode rectifier D3 feeding back a D.C. control.. voltage to these stages. In addition, a further cascode stage SS3 is provided feeding a diode rectified the D.C. output of which is smoothed by filter network R3, C5 and applied to vary the effective capacity of back-biased diodes D1, D2. The diodes D1, D2 comprise two arms of a capacity bridge network, the other arms of which comprise respectively a fixed capacitor CF and an adjustable capacitor CT by which the bridge balance may be adjusted. The bridge is fed with signal across one diagonal, by means of transformer T1 and the other diagonal feeds the signal to the amplifier input via transformer TO. The D.C. bias is applied to the diodes over resistor R2 and D.C. blocking condenser C4, a similar resistor R1 in series with corresponding condenser C3 being connected to the opposite corner of the bridge to maintain the balance.
GB1952260A 1960-06-02 1960-06-02 Improvements in or relating to electronic amplifiers Expired GB969202A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1952260A GB969202A (en) 1960-06-02 1960-06-02 Improvements in or relating to electronic amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1952260A GB969202A (en) 1960-06-02 1960-06-02 Improvements in or relating to electronic amplifiers

Publications (1)

Publication Number Publication Date
GB969202A true GB969202A (en) 1964-09-09

Family

ID=10130799

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1952260A Expired GB969202A (en) 1960-06-02 1960-06-02 Improvements in or relating to electronic amplifiers

Country Status (1)

Country Link
GB (1) GB969202A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628166A (en) * 1968-10-11 1971-12-14 Rca Corp Wide-band amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628166A (en) * 1968-10-11 1971-12-14 Rca Corp Wide-band amplifier

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