Switched-capacitor filter

Details Switched-capacitor filter Switched-capacitor filter

1980-05-23

1982-06-01

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

328151, H03H 1900

Patent

active

043330649

ABSTRACT:
A switched-capacitor filter provided with, at its input stage, a prefilter comprised only of a plurality of additional switched capacitors together with a switched capacitor common to the switched-capacitor filter. The switched capacitor common to the switched-capacitor filter is driven by primary clock pulses having a period T, while the additional switched capacitors are sequentially driven by secondary clock pulse groups. Each of the secondary clock pulse groups has the same period T, and the phases of the second clock pulse groups are shifted by T/2.sup.k, 2T/2.sup.k, 3T/2.sup.k . . . (2.sup.k -1)T/2.sup.k with respect to the first clock pulses (k is a positive integer). The sampled and held signals in the switched capacitors are supplied synchronously to the switched-capacitor filter.

REFERENCES:
patent: 3588531 (1971-06-01), Bjor
patent: 3621402 (1971-08-01), Gardner
patent: 3852619 (1974-12-01), Carbrey

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