OP-amplifier with an offset voltage cancellation circuit

Details OP-amplifier with an offset voltage cancellation circuit OP-amplifier with an offset voltage cancellation circuit

2007-01-23

2007-01-23

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000, C330S260000, C330S261000

Reexamination Certificate

active

10998372

ABSTRACT:
An OP-amplifier with an offset cancellation circuit is provided. The OP-amplifier includes: an input unit having a mirror circuit and first and second differential input circuits, the mirror circuit having first and second output terminals, the first differential input circuit having a first bias circuit and the second differential input circuit having a second bias circuit; an output unit for amplifying output signals of the first and second differential input circuits; and a differential mode feedback circuit for sensing a voltage difference between an output voltage and an input voltage applied to the first and the second differential input circuits, for outputting a first voltage and a second voltage based on the voltage difference, and for feeding back the first voltage to the first bias circuit and feeding back the second voltage to the second bias circuit to remove an offset voltage.

REFERENCES:
patent: 6052025 (2000-04-01), Chang et al.
patent: 6107882 (2000-08-01), Gabara et al.
patent: 6388522 (2002-05-01), Fattaruso et al.
patent: 04-040108 (1992-02-01), None
patent: 04-097608 (1992-03-01), None
patent: 04-271607 (1992-09-01), None
patent: 00-031824 (2000-01-01), None
patent: 99-038009 (1999-06-01), None
patent: 1020010090703 (2001-10-01), None
Kyu-Tae Lim, Thesis entitled “The TFT-LCD Data Output Driver With Offset Cancellation Circuit”, Feb. 2004.
Kyu-Tae Lim et al., Abstract presentation “The TFT-LCD Data Output Driver With Offset Cancellation Circuit”, 2003 IEEE Conference on Electron Devices and Solid State Circuits, Dec. 16-18, 2003.

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