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A quadrature charge-domain sampler with embedded FIR and IIR filtering functions

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4 Author(s)
Karvonen, S. ; Electron. Lab., Univ. of Oulu, Finland ; Riley, T.A.D. ; Kurtti, S. ; Kostamovaara, J.

A circuit technique for integrating built-in complex finite-impulse-response (FIR) and infinite-impulse-response (IIR) filtering functions into operation of a subsampler is presented. Based on integrative multiple sampling in the charge domain, the complex FIR filtering function of the sampler provides internal anti-aliasing and image band suppression prior to quadrature downconversion by subsampling. The complex IIR filtering function, taking place at the output sampling rate of the sampler, performs further first-order channel selection filtering on the downconverted signal. An example 50-MHz IF-sampler implementation in 0.8-μm BiCMOS demonstrating the feasibility of the technique is presented in the paper.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 2 )

Date of Publication:

Feb. 2006

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