Gain-controlled amplifier circuits

Details Gain-controlled amplifier circuits Gain-controlled amplifier circuits

1979-03-15

1980-09-30

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 177, G01S 1314, G01S 740

Patent

active

042258650

ABSTRACT:
Apparatus for controlling the gains of a pair of gain-matched amplifiers includes means for applying a pilot tone of constant amplitude to each amplifier through separate attenuators during a repeated correction time interval. Three control loops are provided, one of which compares the output of one amplifier with a reference signal at times other than a correction time interval to control the gain of that amplifier. A second loop compares the output of the other amplifier with the same reference signal only during each correction time interval to control the gain of the second amplifier. Finally, the third loop compares the output of the first amplifier and the reference signal during each correction time interval to produce a signal controlling the two attenuators.

REFERENCES:
patent: 3921173 (1975-11-01), Thomson

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