Operational amplifier and method of driving liquid crystal...

Details Operational amplifier and method of driving liquid crystal... Operational amplifier and method of driving liquid crystal...

2011-04-05

2011-04-05

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S009000, C330S267000

Reexamination Certificate

active

07920025

ABSTRACT:
It was difficult to design an operational amplifier which can cancel an offset to drive a liquid crystal display. An operational amplifier includes: a first differential pair having a first transistor and a second transistor of a first conduction type; a second differential pair having a third transistor and a fourth transistor of a second conduction type; a first floating current source; a second floating current source; and an output stage having a fifth transistor and a sixth transistor, in which, when an input signal is applied to the first and third transistor, an electric current which flows into the fifth transistor and the sixth transistor is set by the first floating current source, and when the input signal is applied to the second and fourth transistor, an electric current which flows into the fifth transistor and the sixth transistor is set by the second floating current source.

REFERENCES:
patent: 7408402 (2008-08-01), Nishimura
patent: 7443239 (2008-10-01), Tsuchi et al.
patent: 7573333 (2009-08-01), Yokota
patent: 6-326529 (1994-11-01), None
patent: 11-249623 (1999-09-01), None

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