Switched capacitor filter

Details Switched capacitor filter Switched capacitor filter

1987-08-13

1989-08-29

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333 19, 330107, H03H 1112

Patent

active

048621218

ABSTRACT:
A biquadrature switched capacitor filter having differential input/output integrator amplifiers (12,34) and switched capacitor networks (16,28,36,40). The differential outputs of one amplifier (12) are crossed and connected to the switched capacitor networks (36,40) of the other amplifier (34) to provide a negative capacitance effect. Feedforward capacitors (70,72) are switched to prevent the stage input signals (IN+, IN-) from being coupled during certain phases of a biphase nonoverlapping clock. In high-pass applications, a feedback capacitor (134, 136) makes positioning of pole and zero responses easy. Amplifier bandwidth is controlled by switched capacitors (148, 152) connected to the amplifiers during certain clock phases.

REFERENCES:
patent: 4559498 (1985-12-01), Sokoloff
patent: 4633425 (1986-12-01), Senderowicz
patent: 4647865 (1987-03-01), Westwick
Gregorian, Roubik; "Switched-Capacitor Filter Design Using Cascaded Sections"; IEEE Trans on Circuits and Systems; vol. CAS-27, No. 6; Jun. 1980; pp. 515-521.
Laker, K. R. et al.; "Design & Implementation of Cascaded Switched Capacitor Delay Equalizers"; IEEE Trans on Circuits & Systems; vol. CAS-32, No. 7; Jul. 1985; pp. 700-711.

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