ADC with reduced quantization noise and programmable bit...

Details ADC with reduced quantization noise and programmable bit... ADC with reduced quantization noise and programmable bit...

2006-06-27

2006-06-27

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

07068197

ABSTRACT:
An improved sigma-delta converter includes a post converter filter portion that receives digital data streams. The post converter filter portion is programmable to receive digital data streams of varying bit widths. The data streams have digital amplitudes and contain 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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