Automatic gain control circuit comprising a circuit for comparin

Details Automatic gain control circuit comprising a circuit for comparin Automatic gain control circuit comprising a circuit for comparin

1979-09-20

1981-10-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330284, H03G 330

Patent

active

042976456

ABSTRACT:
For use in combination with a gain controllable amplifier for amplifying an input signal to produce an amplified signal with the gain controlled by a gain control signal, an automatic gain control circuit comprises a first section for shifting the level of the amplified signal by a first reference level and a second section for carrying out envelope detection of the amplified signal to produce an envelope detected signal of which the level is shifted by a second reference level different from the first reference level. A comparator compares the level-shifted signal with the envelope-detected signal to produce a pulse signal when the level of the latter signal traverses that of the former. The pulse signal is supplied to a smoothing circuit to produce a smoothed signal serving as the gain control signal.

REFERENCES:
patent: 3879672 (1975-04-01), Milanes

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