Testable Switched-Capacitor Filters

A Design for Test methodology for S-C filters is presented, based on an architecture using some additional circuitry and providing extra capabilities for both off-and on-line test. The approach uses a comparison mechanism to indicate whether or not two copies of a filter element (a biquad, for instance) have a similar response during their actual operation. The design and implementation of an integrated filter is included to assess the potential usefulness of this new approach.

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