Jorge M. Cañive,  José Gabriel R. C. Gomes,  Antonio Petraglia. 

The very low sensitivity properties of a switched-capacitor structure based on a parallel connection of two allpass filters has been recently demonstrated by computer simulations. This paper presents the IC design of a SC video filter using this technique, and shows experimental results obtained in the laboratory to verify the validity of the proposed approach. A procedure for testing the transfer function of SC filters based on a parallel connection of allpass filter sections is presented.

http://csdl.computer.org/dl/proceedings/sbcci/1999/0387/00/03870115.pdf

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