Method of configuring an n- th degree switched capacitor filter

Details Method of configuring an n- th degree switched capacitor filter Method of configuring an n- th degree switched capacitor filter

1986-03-31

1989-02-07

Harkcom, Gary V.

Boots, shoes, and leggings

333173, G06G 702

Patent

active

048036501

ABSTRACT:
An n-th degree switched capacitor filter having transfer characteristics expressed by a transfer function H(Z) can be configured by expanding the transfer function H(Z) to an n-element linear simultaneous state equation of n state voltages inclusive of an output voltage. The coefficients of the linear state equation a.sub.11 to a.sub.n2, b.sub.11 to b.sub.nn are determined in a range within which the filter circuit can be configured by hardware and further each state voltage is below a maximum output voltage. In practice, the filter is configured by plural leapfrog type differential operational amplifiers having base capacitors C.sub.o, plural transmission gates, and plural electric charge transfer capacitors C.sub.T so as to determine each coefficient on the basis of ratios C.sub.T /C.sub.o. The filter is realized by a monolithic integrated circuit (IC) and provided with a higher signal-to-noise (S/N) ratio and a wider dynamic range without deteriorating electrical characteristics and increasing cost.

REFERENCES:
patent: 4354169 (1982-10-01), Nossek
patent: 4356464 (1982-10-01), Fettweis
patent: 4364116 (1982-12-01), Nossek
patent: 4378538 (1983-03-01), Gignoux
patent: 4470126 (1984-09-01), Haque
patent: 4475170 (1984-10-01), Haque
patent: 4633425 (1986-12-01), Senderowicz

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