A/D conversion circuit, control method thereof, solid-state...

Details A/D conversion circuit, control method thereof, solid-state... A/D conversion circuit, control method thereof, solid-state...

2008-05-30

2009-11-10

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000

Reexamination Certificate

active

07616146

ABSTRACT:
An A/D conversion circuit includes: an input capacitance to which an input signal and a reference signal are sequentially applied; an operational amplifier; a first switch connected between the other end of the input capacitance and a first input end of the operational amplifier; a feedback capacitance connected to the first input end of the operational amplifier; a second switch connected between the other end of the feedback capacitance and an output end of the operational amplifier; a third switch selectively applying a predetermined voltage to the other end of the feedback capacitance; a fourth switch selectively causing a short circuit between the first input end and the output end of the operational amplifier; a fifth switch applying the predetermined voltage to a second input end of the operational amplifier; and a sixth switch applying a ramp reference voltage to the second input end of the operational amplifier.

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