Analog circuit, electronic instrument, and operational...

Details Analog circuit, electronic instrument, and operational... Analog circuit, electronic instrument, and operational...

2007-11-08

2009-11-17

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

Reexamination Certificate

active

07619474

ABSTRACT:
An analog circuit includes a first circuit including a first-type operational amplifier of which a frequency of an amplification target signal is a first frequency, and a second circuit including a second-type operational amplifier of which a frequency of an amplification target signal is a second frequency lower than the first frequency. When a channel width and a channel length of a differential-stage transistor of a differential section of the first-type operational amplifier are respectively referred to as W1aand L1a, a bias current flowing through the differential section is referred to as Ia, a channel width and a channel length of a differential-stage transistor of a differential section of the second-type operational amplifier are respectively referred to as W1band L1b, and a bias current flowing through the differential section is referred to as Ib, W1b×L1b>W1a×L1aand Ia>Ib are satisfied.

REFERENCES:
patent: 5130666 (1992-07-01), Nicollini
patent: 2004/0196936 (2004-10-01), Kawama et al.
patent: 2008/0280578 (2008-11-01), Nimura
patent: A 03-226620 (1991-10-01), None
patent: A-4-217106 (1992-08-01), None
patent: A-2004-312074 (2004-11-01), None
Pending Fukuzawa, Akihiro; Filed Nov. 8, 2007 U.S. Appl. No. 11/979,764.
Pending Fukuzawa, Akihiro; Filed Nov. 8,2007 U.S. Appl. No. 11/979,814.
Pending Fukuzawa, Akihiro; Filed Nov. 8, 2007 U.S. Appl. No. 11/979,824.
U.S. Appl. No. 11/803,167, filed May 11, 2007.

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