Fourth-order cascaded sigma-delta modulator

Details Fourth-order cascaded sigma-delta modulator Fourth-order cascaded sigma-delta modulator

1993-11-03

1995-08-29

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

375247, H03M 302

Patent

active

054464609

ABSTRACT:
A method of cascading sigma-delta modulators includes the step of feeding the input to the quantizer of each modulator stage to the subsequent stage. Therefore, the signal which is fed to each of the subsequent stages is the difference between the output and the quantization noise of the previous stage. The method also includes the step of removing the quantization noise of the first two stages, as well as the output of the first two stages, so that the final output of the cascaded modulators is a delayed version of the input, plus a scaled version of the last stage which has been shaped with a fourth-order high pass function.

REFERENCES:
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patent: 5061928 (1991-10-01), Karema et al.
patent: 5065157 (1991-11-01), Ribner et al.
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patent: 5283578 (1994-02-01), Ribner et al.
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"A Comparison of Modulator Networks for High-Order Oversampled .SIGMA..increment. Analog-to-Digital Converters," D. B. Ribner, IEEE Transactions on Circuits and Systems, (1991) Feb., No. 2., pp. 145-159.

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