Variable gain circuit

Details Variable gain circuit Variable gain circuit

2009-07-17

2010-11-02

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S260000, C330S310000

Reexamination Certificate

active

07825728

ABSTRACT:
Provided is a variable gain circuit in which it is not necessary to provide a plurality of phase compensation capacities while stability of a circuit is maintained regardless of a set variable gain. A variable gain circuit comprises a precedent stage amplifier circuit for amplifying an external input signal, a subsequent stage amplifier circuit for amplifying an output signal of the precedent stage amplifier circuit, a phase compensation circuit having a fixed capacitative element and connected between an output terminal and an input terminal of the subsequent stage amplifier circuit, and a gain setting circuit adapted to be capable of setting a gain value of the whole of the precedent stage amplifier circuit and the subsequent stage amplifier circuit to a plurality of values, wherein one of the gain value and a transconductance value of the precedent stage amplifier circuit can be set in conjunction with the other.

REFERENCES:
patent: 3737798 (1973-06-01), Faraguet et al.
patent: 3754126 (1973-08-01), Williams, Jr.
patent: 3927938 (1975-12-01), Seigenji
patent: 4340854 (1982-07-01), Jones et al.
patent: 6667658 (2003-12-01), Bourgoin et al.
patent: 7417506 (2008-08-01), Klein et al.
patent: 7625118 (2009-12-01), Mizuno
patent: 08-330868 (1996-12-01), None

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