Sigma delta analog to digital converter with internal...

Details Sigma delta analog to digital converter with internal... Sigma delta analog to digital converter with internal...

2007-12-28

2009-10-13

Nguyen, Linh V (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S122000, C341S155000, C341S172000

Reexamination Certificate

active

07602325

ABSTRACT:
A sigma-delta (ΣΔ) analog to digital converter with internal synchronous demodulation responsive to a sample clock, reference clock and conversion clock including a sample switching circuit responsive to an AC input to sample the AC input at the sample clock rate; the sample switching circuit including first and second input switches responsive to the reference clock for selectively, alternately sampling the positive and the negative AC input at the reference clock rate; and an inverter circuit responsive to the reference clock and the sample clock for reversing the polarity of signals from the sample clock in synchronism with the reference clock to reverse the sense of the input switches and synchronously demodulating the AC input within the converter.

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