Switched capacitor high-pass filter

Details Switched capacitor high-pass filter Switched capacitor high-pass filter

1982-09-02

1984-10-09

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

307523, 328151, H03H 1900, H03H 748

Patent

active

044764480

ABSTRACT:
A switched capacitor MOS high-pass filter (10) includes a blocking capacitor (C.sub.1) which accepts an input signal at one side (IN). A first electronic toggle switch (S.sub.1) connects the gate of a depletion-mode buffer transistor (T.sub.1) alternately to the other side of the blocking capacitor (C.sub.1) and to ground in response to a pair of non-overlapping switching pulse trains (.phi..sub.1), (.phi..sub.2). A depletion-mode transistor (T.sub.2) provides current to the buffer transistor (T.sub.1). One side of an output capacitor (C.sub.2) is connected to the source of the buffer transistor (T.sub.1). A second toggle switch (S.sub.2) connects the other side of the output capacitor (C.sub.2) alternately to an output terminal (OUT) and to ground.
Also disclosed is a filter (14) which includes a correction network (18) to eliminate from the output signal the effect of a feed-through error voltage generated by the action of the first switch (S.sub.1).

REFERENCES:
patent: 3526858 (1970-09-01), Heinlein et al.
patent: 3531741 (1970-09-01), Langer

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