Sigma delta modulator and sigma delta A/D converter using...

Details Sigma delta modulator and sigma delta A/D converter using... Sigma delta modulator and sigma delta A/D converter using...

2011-03-29

2011-03-29

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

07916056

ABSTRACT:
A sigma-delta modulator is provided. The sigma-delta modulator includes a differential amplifier which outputs a difference signal indicating a difference between an input analog signal and a feedback input analog signal, an integrator which integrates the difference signal, a band pass filter unit connected to the integrator in parallel which performs band pass filtering with respect to the difference signal, an adder which adds the band-pass filtered signal to the integrated signal, a comparator which compares a signal output from the adder with a predetermined reference value, converts the comparison result into a digital signal, and outputs the digital signal; and a digital-to-analog (D/A) which converts the digital signal output from the comparator into an analog signal and feeds the analog signal back to the differential amplifier.

REFERENCES:
patent: 5757300 (1998-05-01), Koilpillai et al.
patent: 5894468 (1999-04-01), Kimura et al.
patent: 5907299 (1999-05-01), Green et al.

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