Variable gain circuit

Details Variable gain circuit Variable gain circuit

2008-04-22

2008-04-22

Nguyen, Patricia (Department: 2817)

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

C330S12400D, C330S310000

Reexamination Certificate

active

07362172

ABSTRACT:
Low distortion is implemented even in a high input level, and a smooth change in gain is maintained. A first amplifier (10) with high gain and low noise that can be gain-controlled by a first gain control signal, and a second amplifier (20) with low gain and low distortion that can be gain-controlled by a second gain control signal are provided, and a third amplifier (30) is further coupled with an outputs of the first and the second amplifiers (10, 20). An input terminal of the first amplifier (10) and an input terminal of the second amplifier (20) are coupled with each other, and an output terminal of the first amplifier (10) and an output terminal of the second amplifier (20) are coupled with each other. The output of the first amplifier (10) is then turned on or off by a mode switching signal. A change in gain resulting from turning on and off the first amplifier (10) is corrected by the third amplifier (30).

REFERENCES:
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PCT International Search Report dated May 31, 2005.
Japanese Office Action dated May 2, 2006 with English translation.

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