GB1162046A - Improvements in or relating to Automatic Control of the Power Dissipated by Amplifiers - Google Patents

Improvements in or relating to Automatic Control of the Power Dissipated by Amplifiers

Info

Publication number
GB1162046A
GB1162046A GB1924167A GB1924167A GB1162046A GB 1162046 A GB1162046 A GB 1162046A GB 1924167 A GB1924167 A GB 1924167A GB 1924167 A GB1924167 A GB 1924167A GB 1162046 A GB1162046 A GB 1162046A
Authority
GB
United Kingdom
Prior art keywords
amplifier
output
combined
power supply
control
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
GB1924167A
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.)
Alcatel CIT SA
Original Assignee
Alcatel CIT SA
CIT Compagnie Industrielle des Telecommunications SA
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 Alcatel CIT SA, CIT Compagnie Industrielle des Telecommunications SA filed Critical Alcatel CIT SA
Publication of GB1162046A publication Critical patent/GB1162046A/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 without distortion of the input signal
    • H03G3/20—Automatic control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
    • H03F1/548—Protection of anode or grid circuit against overload
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/22—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with tubes only

Abstract

1,162,046. Amplifying circuits; radio transmitting systems. C.I.T.-COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS. 26 April, 1967 [11 May, 1966], No. 19241/67. Headings H3W and H4L. A device for the automatic control of the energy dissipated in an amplifier from that received from a D.C. power supply maintains the energy dissipation below a maximum value, and comprises means 18 for combining the two outputs of a reflectometer 14 located between the amplifier 13 and its load impedance 15, with the output of a wattmeter circuit 17 measuring the energy supplied by the D.C. power supply 16. The combined output of the adding device 18 is compared with a reference voltage W in threshold means 19, whereby when the combined output exceeds the reference voltage a control is applied to the energy dissipated in the amplifier. As shown, the control means comprises a variable attenuator 12 connected in the drive from driver stage 11. In a second embodiment (Fig. 2, not shown), the two outputs of the reflectometer are combined in a differential amplifier, the output of which is combined in a second differential amplifier with the output of the wattmeter circuit; this comprises a resistor in the negative lead of the power supply, which is of the stabilized type. The threshold means comprises a diode with the combined output fed to its cathode and a negative delay bias applied to the anode via a series resistor; when the output voltage exceeds the delay, a negative-going control voltage is applied as bias to reduce the gain of a variable-gain amplifier connected between the driver stage and the power amplifier. The adding device may comprise a digital computer, more especially where several amplifiers are centrally controlled.
GB1924167A 1966-05-11 1967-04-26 Improvements in or relating to Automatic Control of the Power Dissipated by Amplifiers Expired GB1162046A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR61192A FR1492932A (en) 1966-05-11 1966-05-11 Automatic adjustment of the power of an amplifying device

Publications (1)

Publication Number Publication Date
GB1162046A true GB1162046A (en) 1969-08-20

Family

ID=8608403

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1924167A Expired GB1162046A (en) 1966-05-11 1967-04-26 Improvements in or relating to Automatic Control of the Power Dissipated by Amplifiers

Country Status (6)

Country Link
BE (1) BE698041A (en)
DE (1) DE1591042B1 (en)
FR (1) FR1492932A (en)
GB (1) GB1162046A (en)
LU (1) LU53620A1 (en)
NL (1) NL157157B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2423919A1 (en) * 1978-04-17 1979-11-16 Rockwell International Corp PROTECTED AMPLIFIER
GB2260233A (en) * 1991-09-11 1993-04-07 Thomson Consumer Electronics Power supply arrangements.
GB2462445A (en) * 2008-08-06 2010-02-10 Kbo Dynamics Ltd Microprocessor-controlled bias adjustment in a thermionic valve audio amplifier

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH615785A5 (en) * 1977-05-04 1980-02-15 Bbc Brown Boveri & Cie
EP0222927B1 (en) * 1985-11-19 1988-06-15 Herfurth Gmbh High-frequency amplifier

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2423919A1 (en) * 1978-04-17 1979-11-16 Rockwell International Corp PROTECTED AMPLIFIER
GB2260233A (en) * 1991-09-11 1993-04-07 Thomson Consumer Electronics Power supply arrangements.
GB2260233B (en) * 1991-09-11 1995-09-27 Thomson Consumer Electronics Power supply arrangements
GB2462445A (en) * 2008-08-06 2010-02-10 Kbo Dynamics Ltd Microprocessor-controlled bias adjustment in a thermionic valve audio amplifier
US7936211B2 (en) 2008-08-06 2011-05-03 Kbo Dynamics International Limited Controlling the performance of a thermionic tube

Also Published As

Publication number Publication date
FR1492932A (en) 1967-08-25
BE698041A (en) 1967-11-06
DE1591042B1 (en) 1970-07-02
NL157157B (en) 1978-06-15
LU53620A1 (en) 1969-02-10
NL6706512A (en) 1967-11-13

Similar Documents

Publication Publication Date Title
GB1163941A (en) Amplifier
GB1500192A (en) Compression or expansion of audio frequency signals
US4119922A (en) Circuit for automatic volume compression or volume expansion
GB1321946A (en) Amplifier protective circuits
GB1283964A (en) Transistor biasing arrangement
US4115741A (en) Fast attack automatic gain control circuit
GB1162046A (en) Improvements in or relating to Automatic Control of the Power Dissipated by Amplifiers
US3428909A (en) Automatic control of drive for linear power amplifier
US4935705A (en) High efficiency variable power amplifier
GB1513810A (en) Transistor amplifiers including protective circuits
US3210680A (en) Audio signal variable attentuating circuit
GB937536A (en) Automatic-gain and bandwidth control system for transistor circuits
GB1469990A (en) Gain control circuit
US4327333A (en) AGC Current source
GB1086490A (en) Improvements in or relating to transistor receiving circuits
ES372211A1 (en) Wide-band amplifier
GB1249222A (en) Gain controlled amplifier
GB1232912A (en)
US3596199A (en) Transistorized amplifiers and protective circuits therefor
GB1033704A (en) Improvements in or relating to transistor amplifiers
US3750040A (en) Transistor delay line driver
GB1364639A (en) Pulse signal amplifying circuits
GB1265883A (en)
GB584475A (en) Improvements in or relating to electrical amplifiers
GB1057308A (en) Improvements in or relating to automatic gain control circuits

Legal Events

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