Sigma-delta modulation with offset

Details Sigma-delta modulation with offset Sigma-delta modulation with offset

2006-07-19

2008-11-25

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

C341S143000

Reexamination Certificate

active

07456766

ABSTRACT:
Techniques for performing ΣΔ modulation with offset in order to reduce out-of-band quantization noise are described. In an exemplary oversampling DAC that implements ΣΔ modulation with offset, an interpolation filter performs upsampling and interpolation filtering on data samples to generate input samples. A summer adds an offset to the input samples to generate intermediate samples. The offset alters the characteristics of the quantization noise from a ΣΔ modulator and may be selected to obtain the desired quantization noise characteristics, to retain as much dynamic range as possible, and to simplify the removal of the offset. The ΣΔ modulator performs upsampling and noise shaping on the intermediate samples and provides output samples. An offset removal unit removes at least a portion of the offset from the output samples in the digital or analog domain. A DAC converts the output samples to analog.

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Radke et al, “A 14-Bit Current-Mode ΣΔ DAC Based Upon Rotated Data Weighted Averaging”, IEEE Journal of Solid-State Circuits, vol. 35, No. 8, pp. 1074-1084, Aug. 2000.

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