Switched-capacitor filter circuit having at least one simulated

Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters

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328151, 333 19, 333175, H03H 1900, H03H 1148, H03H 1702

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043530443

ABSTRACT:
A switched-capacitor filter circuit having at least one simulated inductor and having a resonance frequency which is one-sixth of the sampling frequency as pulse-controlled switches co-operatively operable for connecting a first capacitor to a pair of input terminals during a first clock phase and simultaneously connecting a second capacitor to the output of an inverting integration circuit, followed by discharge of the first capacitor to a capacitor in the integration circuit during a second clock pulse phase, followed by a third clock pulse phase during which the first capacitor is charged from the output of the integration circuit and the second capacitor is simultaneously connected to the pair of input terminals and during a fourth clock pulse phase the second capacitor discharges to the capacitor in the integration circuit.

REFERENCES:
patent: 4179665 (1979-12-01), Gregorian
patent: 4313096 (1982-01-01), Fleischer
"Switched-Capacitor Filter Design Using the Bilinear z-Transformer", IEEE Transactions on Circuits and Systems, vol. CAS-25, No. 12, Dec., 1978, pp. 1039 through 1044.
"Switched Capacitor Circuits Bilinearly Equivalent to Floating Inductor or F.D.N.R.", Electronics Letters, Feb. 1, 1979, vol. 15, No. 3, pp. 87-88.
Gregorian-"Filtering Techniques with Switched-Capacitor Circuits", Microelectronics Journal, vol. 11, No. 2, Mar.-Apr., 1980, Mackintosh Publications, Ltd., Luton; pp. 13-21.

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