Gain control circuit and its gain control method

Details Gain control circuit and its gain control method Gain control circuit and its gain control method

2011-06-21

2011-06-21

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S140000

Reexamination Certificate

active

07965142

ABSTRACT:
A gain control circuit and its gain control method, said gain control method comprising the following steps: firstly, outputting continuously a counter value; next, generating a ramp wave signal based on said counter value, and at a voltage where a control voltage signal intersects said ramp wave signal, obtaining an initial counter value based on said ramp wave signal, thus determining an initial voltage gain of an amplifier circuit; then, when a high or low voltage of an output signal of said amplifier circuit is greater or less than a predetermined detection voltage upper or lower limit, adjusting a DC voltage level of said ramp wave signal with a detection signal; and finally, obtaining at said voltage a counter value less than said initial counter value based on said ramp wave signal, hereby reducing said initial voltage gain based on said counter value.

REFERENCES:
patent: 4992753 (1991-02-01), Jenson et al.
patent: 5416441 (1995-05-01), Nagano
patent: 5642075 (1997-06-01), Bell

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