Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

Switched cap. filt

A switched capacitor is an electronic circuit element used for discrete timesignal processing. It works by moving charges into and out of capacitors when switches are opened and closed. Usually, non-overlapping signals are used to control the switches, so that not all switches are closed simultaneously. Filters implemented with these elements are termed "switched-capacitor filters," and depend only on the ratios between capacitances. This makes them much more suitable for use within integrated circuits, where accurately specified resistors and capacitors are not economical to construct.

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