Gain controlled amplifier circuits

Details Gain controlled amplifier circuits Gain controlled amplifier circuits

1979-01-16

1980-08-26

Mullins, James B.

Amplifiers

With pilot frequency control means

330124R, 330132, 330134, 330141, H03G 320

Patent

active

042197805

ABSTRACT:
Apparatus for controlling the gains of a pair of gain-matched amplifiers includes means for applying to each amplifier a pilot tone in the form of an exponentially-decaying periodic signal. The apparatus also includes three control loops, one for comparing the output of one amplifier with a reference signal to derive an error signal used to control the amplifier gains when the pilot tone is absent, and a second for controlling the gains when the pilot tone is present. The third loop subtracts the outputs of the two amplifiers and uses the resulting error signal in conjunction with one or other of the signals from the other two loops to control the gain of one of the two amplifiers.

REFERENCES:
patent: 2997668 (1961-08-01), Nolle
patent: 4061041 (1977-12-01), Fletcher et al.

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