| 摘要 |
A switched capacitor MOS high-pass filter (10) includes a blocking capacitor (C1) which accepts an input signal at one side (IN). A first electronic toggle switch (S1) connects the gate of a depletion-mode buffer transistor (T1) alternately to the other side of the blocking capacitor (C1) and to ground in response to a pair of non-overlapping switching pulse trains ( phi 1), ( phi 2). A depletion-mode transistor (T2) provides current to the buffer transistor (T1). One side of an output capacitor (C2) is connected to the source of the buffer transistor (T1). A second toggle switch (S2) connects the other side of the output capacitor (C2) 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 (S1).
|
