Sigma-delta analog-to-digital converter with reduced...

Details Sigma-delta analog-to-digital converter with reduced... Sigma-delta analog-to-digital converter with reduced...

2005-01-04

2005-01-04

Tokar, Michael (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S144000, C341S155000, C341S172000

Reexamination Certificate

active

06839010

ABSTRACT:
An improved sigma-delta converter includes a post converter filter that receives a digital data stream. The data stream has a digital amplitude and contains quantization noise. Quantization noise is larger for digital amplitudes in a second larger-amplitude range than in a first smaller-amplitude range. The post converter filter has a higher cut-off frequency when the digital amplitude is in the first amplitude range and a lower cut-off frequency when the digital amplitude is in the second amplitude range. The post converter filter therefore filters out a portion of the larger quantization noise when the digital amplitude is larger. Quanitization noise is reduced without limiting the input signal voltage range that can be digitized.

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