Switched-capacitor cosine filter

Details Switched-capacitor cosine filter Switched-capacitor cosine filter

H - Electricity

03

H

333/50

H03H 11/12 (2006.01) H03F 1/34 (2006.01) H03H 19/00 (2006.01)

Patent

CA 1159910

ABSTRACT OF THE INVENTION A switched capacitor cosine filter for a sampled-data system functions to reject extraneous frequency components of an incoming analog sig- nal around the sampling frequency, thereby avoiding aliasing. The filter comprises an operational amplifier whose inverting input receives input sig- nals through a switched input capacitor controlled by a four-switch network controlled by alternating clock phases and feedback signals from the amplifier output through a feedback capacitor. The transfer function of the circuit provides a zero of transmission at the sampling frequency, thereby eliminating unwanted frequency components. A self-contained version of the cosine filter is provided by the addition of another grounded switched capacitor with appropriately timed switches in the feedback network.

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