Switched-capacitor elliptic filter

Details Switched-capacitor elliptic filter Switched-capacitor elliptic filter

H - Electricity

03

H

333/50

H03H 11/12 (2006.01) H03H 19/00 (2006.01)

Patent

CA 1157922

SWITCHED-CAPACITOR ELLIPTIC FILTER Abstract of the Disclosure An elliptic state variable filter uses switched capa- citors controlled by an arrangement of switches that provides for a frequency response independent of stray capacitors in the circuit. The filter section comprises three integrating operational amplifiers connected in series, with a feedback connection between the output of the second operational amp- lifier and the circuit input to the first operational ampli- fier. Signals via a feed forward connection from the circuit input and the outputs of the first and second operational amplifier are summed by the third operational amplifier. Transmission zeros of the filter transfer function are reali- zed independent of poles and with a feed forward arrangement which places them inherently on the unit circle and produces infinite loss at each zero frequency despite variations in capacitor ratios in the circuit.

366069

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