Cascade-type variable-order delta-sigma modulator

Details Cascade-type variable-order delta-sigma modulator Cascade-type variable-order delta-sigma modulator

2008-01-15

2008-01-15

Williams, Howard L. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S076000

Reexamination Certificate

active

11338651

ABSTRACT:
A cascade-type variable-order delta-sigma modulator with low power consumption that can change the number of stages of the quantization loops, which are connected in a cascade configuration, to an optimum number depending on peripheral circuitries in a configuration as simple as possible. The present invention includes first to nthstages of delta-sigma modulating type quantization loops (n is an integer equal to or more than 2) connected in a cascade configuration, and a noise rejecting circuit. Each quantization loop quantizes an input signal, outputs the quantization result, and feeds back the quantization result to itself. The noise rejecting circuit rejects a quantization noise of the first stage of quantization loop, and comprises (n−1) selectors for activating and de-activating the respective output signals of the second and succeeding stages of the quantization loops in compliance with the control signal.

REFERENCES:
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patent: 6538592 (2003-03-01), Yang et al.
patent: 6839012 (2005-01-01), Kawamura
patent: 2004-80152 (2004-03-01), None

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