Sigma-delta analog-to-digital converter and method for...

Details Sigma-delta analog-to-digital converter and method for... Sigma-delta analog-to-digital converter and method for...

2007-03-13

2007-03-13

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

10515561

ABSTRACT:
An arrangement (100) and method for sigma-delta analog-to-digital conversion by providing parallel translating sigma-delta analog-to-digital converters (21, 22) and summing their outputs to produce a digital output signal having a bandwidth greater than that of the first or second translating sigma-delta analog-to-digital converters (21, 22). The parallel translating sigma-delta analog-to-digital converters (21, 22) use switching sequences arranged to cancel third and fifth harmonics in the digital output signal. Orthogonality error in the switching sequences applied to the sigma-delta modulators is compensated by adjusting the phase of the signals applied to mixers (51, 52).

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Eerola et al., “Direct Conversion Using Lowpass Sigma-Delta Modulation,” IEEE Proceedings of the International Symposium on Circuits and Systems, vol. 4, Conf. 25, 1992, p. 2653-2656, no month.

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