Multi-input operational amplifier circuit, digital/analog...

Details Multi-input operational amplifier circuit, digital/analog... Multi-input operational amplifier circuit, digital/analog...

2008-09-08

2011-11-22

Williams, Howard (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S136000, C345S690000

Reexamination Certificate

active

08063808

ABSTRACT:
A multi-input operational amplifier circuit operable with a high degree of accuracy and in a small area, a D/A converter using the multi-input operational amplifier circuit, and a drive circuit or driver for a display device, using the D/A converter. In embodiments of the multi-input operational amplifier circuit, a constant current source of a third differential amplifier circuit that causes a doubled constant current i×2 to flow with respect to constant current sources of first and second differential amplifier circuits by application of two types of bias voltages thereto is configured using PMOS of the same number and size. Therefore, operations equivalent to those of a conventional circuit may be realized by the three constant current source PMOSs, and a smaller chip size may be required.

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