Operational amplifier for outputting high voltage output signal

Details Operational amplifier for outputting high voltage output signal Operational amplifier for outputting high voltage output signal

2006-09-28

2008-11-18

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000

Reexamination Certificate

active

07453318

ABSTRACT:
An operational amplifier includes a differential amplifier circuit, receiving a low voltage signal, and a current mirror circuit provided on the downstream. The differential amplifier circuit also includes low withstand voltage N-channel transistors, connected to respective input terminals, and high withstand voltage N-channel transistors, connected to the drain electrodes of the low withstand voltage transistors via junction points, respectively. To the gate electrodes of both the high withstand voltage transistors supplied is a bias voltage. The source electrodes of the low withstand voltage transistors are connected to the drain electrode of another low withstand voltage transistor, which has its gate electrode supplied with a bias voltage so as to operate as a current source. Those low withstand voltage transistors are smaller in size than the high withstand voltage transistors.

REFERENCES:
patent: 4806874 (1989-02-01), Michel
patent: 5124666 (1992-06-01), Liu et al.
patent: 6288669 (2001-09-01), Gata
patent: 6414552 (2002-07-01), Kronmueller et al.
patent: 7230479 (2007-06-01), Forbes et al.
patent: 10-041752 (1998-02-01), None

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