Sigma-delta analogue-to-digital conversion circuits

Details Sigma-delta analogue-to-digital conversion circuits Sigma-delta analogue-to-digital conversion circuits

1997-06-24

2000-02-01

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341155, H03M 300

Patent

active

060208368

ABSTRACT:
A third-order sigma-delta analogue-to-digital conversion circuit has a filter comprising the cascaded arrangement of three individual filter circuits, a quantization circuit and a monitoring circuit. The monitoring circuit detects for a predetermined, periodic pattern in the output bit stream. The periodicity of this pattern is ##EQU1## when f.sub.c is the converter sampling frequency and f.sub.r is the resonant frequency of the filter. If the pattern is detected, the monitoring circuit resets the filter.

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