Differential sampling circuit for generating a differential...

Details Differential sampling circuit for generating a differential... Differential sampling circuit for generating a differential...

2005-09-20

2005-09-20

Nguyen, John B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S172000

Reexamination Certificate

active

06946986

ABSTRACT:
A differential sampling circuit is configured around a differential operational amplifier and is provided with a pair of switched-capacitor networks, each including an circuit block, to generate the real value of the differential input signal DC offset at each system clock cycle. During the first half cycle, the differential input signal pair (Vin+,Vin−) is sampled and the holding capacitors in each network are charged. During the second half cycle, the differential input signal pair is sampled again and the holding capacitors are further charged. At the end of the cycle, the charges held in the holding capacitors are applied to the differential operational amplifier, so that the differential output signal is equal to the real differential input signal DC offset value.

REFERENCES:
patent: 5057839 (1991-10-01), Koch
patent: 5140325 (1992-08-01), Yu et al.
patent: 5389928 (1995-02-01), Coppero et al.
patent: 5514999 (1996-05-01), Koifman et al.
patent: 5739720 (1998-04-01), Lee
patent: 6169427 (2001-01-01), Brandt

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