Switched-capacitor elliptic filter

Details Switched-capacitor elliptic filter Switched-capacitor elliptic filter

1979-12-17

1981-12-15

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330151, H03F 134

Patent

active

043061974

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.

REFERENCES:
Allstot et al., "MOS Switched Capacitor Ladder Filters", IEEE Journal of Solid-State Circuits, vol. SC-13, No. 6, Dec. 1978, pp. 806-814.

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