Integrated active electronic switched capacitor filter having ex

Details Integrated active electronic switched capacitor filter having ex Integrated active electronic switched capacitor filter having ex

1988-02-26

1990-04-24

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

330109, H03H 1112

Patent

active

049203258

ABSTRACT:
The filter comprises four operational amplifiers in cascade, with switched capacitors in series at the input of every amplifier, with fixed capacitors in parallel to two of said amplifiers, with fixed and switched capacitors in parallel to the remaining amplifiers, and with fixed and switched capacitors in common to groups of several amplifiers in cascade. According to the invention, a path of fixed and switched capacitors in parallel connects the input of the filter to the input of the fourth amplifier, and a fixed capacitor connects the input of the filter to the input of the second amplifier.

REFERENCES:
patent: 4383228 (1985-05-01), Gaillard
Jacobs, G. M. et al; "Design Techniques for MOS Switched Capacitor Ladder Filters"; IEEE Trans. on Circuits & Systems; vol. CAS--25, No. 12, Dec. 1978; pp. 1014-1021.

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