| 摘要 |
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.
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