Differential amplifier circuit

Details Differential amplifier circuit Differential amplifier circuit

2008-08-05

2010-02-16

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S297000, C330S133000

Reexamination Certificate

active

07663438

ABSTRACT:
A differential amplifier circuit of simple circuit configuration is disclosed, which is capable of releasing an output signal within a voltage range independent of the voltage range of a differential input signal. The differential amplifier circuit1includes: NMOS transistors N1, N2that constitute a first differential pair configured to input a differential input voltage; a resistor element Ra connected to drain terminals X1, X2of the NMOS transistors N1, N2; an op-amp OP having input terminals connected to the drain terminals X1, X2; and NMOS transistors N3, N4that constitute a second differential pair configured to input an output voltage of the op-amp OP and a reference voltage. The drain terminals of the first differential pair are connected to drain terminals, respectively, of the second differential pair.

REFERENCES:
patent: 5028882 (1991-07-01), Marrah et al.
patent: 5900780 (1999-05-01), Hirose et al.
patent: 6677818 (2004-01-01), Singor et al.
patent: 7279982 (2007-10-01), Zhou et al.
patent: 7282994 (2007-10-01), Gopinathan et al.
Yoshio Shirato; “All About Analog ICs in Illustration”; First Edition Second Print; Nov. 10, 1987; Tokyo Denki University Publishing Division.

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