Precision low noise-delta-sigma ADC with AC feed forward and...

Details Precision low noise-delta-sigma ADC with AC feed forward and... Precision low noise-delta-sigma ADC with AC feed forward and...

2007-02-13

2007-02-13

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000, C341S156000

Reexamination Certificate

active

11221620

ABSTRACT:
A delta-sigma converter has coarse and fine ADCs, wherein an integrated error signal is coupled to the coarse ADC whose output drives a DAC to create feedback that achieves loop balance. The coarse ADC provides the most significant bits of the result. The integrated error signal is also applied to a fine ADC whose output bits are not incorporated into the feedback, but which are combined with those of the coarse ADC and the combination applied to a filter that averages the hunting that represents loop balance. A DC feed forward circuit shunts the integrator with a replica of the applied input signal to apply it to the coarse ADC through a summer, allowing its output to be just the integrated error signal without including the applied input. If continuous integration is used, an AC feed forward circuit provides a compensatory voltage that is removed from the integrator output (or alternatively, is added to its input) and that corrects for a frequency dependent error.

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patent: 6556158 (2003-04-01), Steensgaard-Madsen
patent: 6876241 (2005-04-01), Coley et al.

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