Switching scheme for switched capacitor filters

Details Switching scheme for switched capacitor filters Switching scheme for switched capacitor filters

1986-04-30

1988-08-09

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

307353, 307523, 328151, 330 9, 330109, H03H 1900, G11C 2702

Patent

active

047630884

ABSTRACT:
A filter for second order signals in the frequency domain. A novel switching system is described which permits a single capacitor to serve as both a termination capacitor and a sampling capacitor. A capacitor which has a value equal to the desired value of a sampling capacitor is coupled in a feedback loop of an operational amplifier. This capacitor is summed with another capacitor to result in the desired value of the termination capacitor. The present invention permits the fabrication of second order filters in a smaller silicon area than prior art methods.

REFERENCES:
Gregorian-"Switched-Capacitor Filter Design Using Cascaded Sections", IEEE Trans. on Circuits and Systems, vol. CAS-27, No. 6, Jun. 1980; pp. 515-521.

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