Switched-capacitor interpolation filter

Details Switched-capacitor interpolation filter Switched-capacitor interpolation filter

H - Electricity

03

H

333/50

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

Patent

CA 1159909

ABSTRACT OF THE DISCLOSURE An interpolation or smoothing filter circuit for a switched-capacitor system which transforms the sampled-and-held output signals from a switched- capacitor filter into sampled-and-held signals with a doubled sample rate. The circuit comprises an operational amplifier whose noninverting input lead is connected to a switched-capacitor network which receives the sampled-and-held input signals at the normal sample rate. The network includes two separate capacitors controlled by switches operable at two alternating clock phases and connected to provide the desired summation and holding of charges. Feedback leads connected between the amplifier output lead and its noninverting input lead and containing additional capacitors cooperate with the input network to produce an output that is sampled-and-held at twice the sample rate of the input signal.

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