High pass switched capacitor filter section

Details High pass switched capacitor filter section High pass switched capacitor filter section

1978-09-08

1980-07-01

Mullins, James B.

Amplifiers

With periodic switching input-output

330107, 330109, H03F 134

Patent

active

042108721

ABSTRACT:
A high-pass switched capacitor biquadratic filter based on the bilinear z-transform. The filter comprises first and second integrating operational amplifiers connected in series and in combination with a third operational amplifier that serves as a sample and hold and also generates one simple pole and zero pair in the circuit transfer function thereby enabling the circuit to provide for a high degree of filter efficiency in a preselected frequency range. The operational amplifiers are connected to and operate in cooperation with capacitors of a predetermined size which are switched on and off continuously by two phase clock signals supplied to the circuit. The loss characteristic of the filter can be programmed by varying the clocking frequency. Higher order filters can be obtained by the tandem connection of second order circuit sections followed by one or more first order pole-zero section.

REFERENCES:
Delagrange-"FETs in RC Network Tune Active Filter"-Electronics-Dec. 1970, p. 76.

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