Method and apparatus for precision gain control for amplified si

Details Method and apparatus for precision gain control for amplified si Method and apparatus for precision gain control for amplified si

1995-01-30

1996-05-07

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

430279, 430280, H03G 330

Patent

active

055150047

ABSTRACT:
An automatic gain control circuit (100) provides precision gain control for amplified signals. An offset generator (130) generates an offset signal (132) from an output signal (108) of a variable gain amplifier, shifted according to a target signal level, and another offset signal (134) according to a base signal (106). A pulse train generator (140) compares the offset signals (108, 106) and provides a pulse train signal (142) having a particular energy content. A feedback signal (172) based on the particular energy content of the pulse train signal (142) is used to adjust the gain of the variable amplifier (110).

REFERENCES:
patent: 4363977 (1982-12-01), Tsuda et al.
patent: 4606075 (1986-08-01), Eastmond
patent: 4811423 (1989-03-01), Eastmond
patent: 5352988 (1994-10-01), Park

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