Amplifier circuit and gain control method thereof

Details Amplifier circuit and gain control method thereof Amplifier circuit and gain control method thereof

2007-03-21

2008-11-25

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S311000

Reexamination Certificate

active

07456689

ABSTRACT:
An amplifier circuit is provided with a control section that respectively selectively supplies either a second voltage or a third voltage to gates of a plurality of second transistors and gates of a plurality of third transistors by respectively switching the connection states of a plurality of first switching elements and a plurality of second switching elements to their first input terminal sides or to their second input terminal sides.

REFERENCES:
patent: 6175278 (2001-01-01), Hasegawa
patent: 6211737 (2001-04-01), Fong
patent: 6710657 (2004-03-01), Yang
patent: 2007/0222515 (2007-09-01), Koutani et al.
patent: 9-321577 (1997-12-01), None
Willy M.C. Sansen, et al., “Distortion in Bipolar Transistor Variable-Gain Amplifiers”, IEEE Journal of Solid-State Circuits, vol. 8, Aug. 1973, pp. 275-282.

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