| 摘要 |
Continuous time filters and Delta-Sigma analog to digital converters and methods for process variation trim/tuning. In feed forward filters, the resistance of feed forward transconductance elements are adjusted to compensate for process variation in the G<SUB>M</SUB>/SC values in the filters. Since all. G<SUB>M</SUB>/SC values are subject to the same RC process variation, and the resistance in all feed forward transconductance elements is also subject to the same R process variation, the resistance in the feed forward transconductance elements may be adjusted in accordance with analytically predetermined factors based on a single measurement of the RC process variation for each filter to compensate for the overall RC process variation. Various embodiments are disclosed, both as feed forward filters and as Delta-Sigma analog to digital converter systems using such filters.
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