Circuit and method for improved frequency resolution of...

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

Reexamination Certificate

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C327S553000

Reexamination Certificate

active

08044712

ABSTRACT:
An active RC filter (20) includes a first resistive element (23) and a first capacitor array (10/50) which co-acts with the first resistive element (23) to determine a bandwidth characteristic of the programmable active RC filter circuit (20). The total filter capacitance is programmed by switching various first capacitors (4-0, 1, 2 . . . 7) of a first capacitor array (10) in parallel between first and second terminals of the first capacitor array in response to a control word (B0, 1, 2 . . . 7) to determine a first portion of the bandwidth characteristic, and by switching various second capacitors (7-0, 1, 2 . . . 6) of the first capacitor array between the first and second terminals of the first capacitor array in parallel with various ones of the first capacitors (4-0, 1, 2 . . . 7) of the first capacitor array (10) in response to less significant bits (B0, 1, 2 . . . 6) of the control word (B0, 1, 2 . . . 7) to determine a second portion of the bandwidth characteristic.

REFERENCES:
patent: 6452444 (2002-09-01), Mehr
patent: 7113029 (2006-09-01), Hsieh et al.
patent: 7646235 (2010-01-01), Christ

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