High pass switched capacitor filter section

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

H - Electricity

03

H

333/50

H03H 11/36 (2006.01) H03H 15/00 (2006.01) H03H 17/04 (2006.01) H03H 19/00 (2006.01)

Patent

CA 1113553

HIGH PASS SWITCHED CAPACITOR SECTION Abstract of the Disclosure 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.

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