Operational amplifier and method for canceling offset...

Details Operational amplifier and method for canceling offset... Operational amplifier and method for canceling offset...

2008-05-06

2008-05-06

Choe, Henry (Department: 2817)

Amplifiers

With periodic switching input-output

C330S253000

Reexamination Certificate

active

07368983

ABSTRACT:
An operational amplifier that cancels offset voltage while enabling its gain to be set to any value. The operational amplifier includes a first switch for short-circuiting the gates of two transistors in a first differential input unit. A capacitor is connected to the gates of two transistors in a second differential input unit, which is connected in parallel to the first differential input unit. The capacitor holds offset voltage derived from output voltage generated by an operational amplifier circuit. The capacitor generates a potential difference between the gates of the transistors in the second differential input unit to cancel the offset voltage.

REFERENCES:
patent: 6400219 (2002-06-01), Fayed
patent: 6586990 (2003-07-01), Udo et al.
patent: 7081792 (2006-07-01), Kasai et al.
patent: 08-018353 (1996-01-01), None
patent: 2001-292041 (2001-10-01), None

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