Integrator and cyclic AD converter using the same

Details Integrator and cyclic AD converter using the same Integrator and cyclic AD converter using the same

2006-04-07

2009-12-08

Nguyen, Linh V (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S118000, C341S120000, C341S143000, C341S155000, C341S161000

Reexamination Certificate

active

07629917

ABSTRACT:
The present invention provides a cyclic AD converter that reduces power consumption by reducing active circuits such as an X2 amplifier or the like and is particularly suitable to implement in an integrated circuit and also an integrator to be used therefor. The cyclic AD converter uses an integrator11comprising an operational amplifier111, a first integration capacitor C1connected between the input and output terminals of the operational amplifier111, and a second integration capacitor C2to be connected selectively between the reference potential source and the input/output terminals of the operational amplifier111by way of switches S3and S4. The integrator11operates to sample/hold an analog input signal and also obtain a signal equal to the double of a reference signal from a comparator. As a result, an X2 amplifier required in the conventional converter is replaced by integration capacitors and switches, thereby reducing power consumption and easily implementing into a semiconductor integrated circuit.

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