Switched-capacitor elliptic filter
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United States of America Patent
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-
Dec 15, 1981
Grant Date -
N/A
app pub date -
Dec 17, 1979
filing date -
Dec 17, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An elliptic state variable filter uses switched capacitors 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 amplifier and the circuit input to the first operational amplifier. 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 realized 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.
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