Automatic gain control method and device

Details Automatic gain control method and device Automatic gain control method and device

1997-04-14

1999-07-27

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including gain control means

330282, H03G 330

Patent

active

059297069

ABSTRACT:
An automatic gain control method and device capable of maintaining the gain within a predetermined proper range by first amplifying an input analog signal from a microphone or the like, then sampling the amplified analog signal while comparing the voltage thereof with a predetermined reference voltage, and when the number of times that the voltage of the amplified analog signal is higher than the reference voltage exceeds a predetermined number of times, varying the gain of the amplified analog signal stepwise in response to every excess beyond the predetermined number of times. Consequently it becomes possible to eliminate the necessity of an input amplifier of a sufficient bandwidth and an A-D converter, hence realizing manufacture of an improved device composed of a single-chip CMOS integrated circuit, with further advantages of minimizing the number of required component parts, reducing the production processes, achieving a higher integration density and lowering the power consumption.

REFERENCES:
patent: 4670719 (1987-06-01), Sakurai
patent: 4910797 (1990-03-01), Min et al.
patent: 5051707 (1991-09-01), Fujita
patent: 5117201 (1992-05-01), Luther
patent: 5422601 (1995-06-01), Kovacs et al.

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