Sigma-delta modulator

Details Sigma-delta modulator Sigma-delta modulator

2007-04-16

2008-11-25

Nguyen, Linh V (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S118000, C341S120000, C341S155000

Reexamination Certificate

active

07456771

ABSTRACT:
A sigma-delta modulator includes a first adder, a filter, a quantizer and a digital-to-analog converter. The first adder receives an input signal and an analog signal and subtracts the analog signal from the input signal to output a processed signal. The filter receives the processed signal to output a filtered signal. The quantizer receives the filtered signal to generate an output signal. The quantizer works based on a first positive reference voltage and a first negative reference voltage. The digital-to-analog converter generates the analog signal according to the output signal and outputs the analog signal to the first adder. The digital-to-analog converter works based on a second positive reference voltage and a second negative reference voltage. A difference between the first positive reference voltage and the first negative reference voltage is smaller than a difference between the second positive reference voltage and the second negative reference voltage.

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“Analog Integrated Circuit Design” John Wiley & Sons, Inc., 1997 (ISBN 0471144487) D.A. Johns et al., pp. 445-461 and 531-547.

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