1) Mathematically determine the parameters of Biquad filter in S domain and Z domain. See Ref[1] (at 'Rabbit Hole') for detail. One thing worth noting is that the bilinear transformation between S domain and Z domain would introduce distortion ( frequency warping). To minimize the distortion, sample rate has to be much greater than the frequency of interest

2) Determine the capacity values for switched capacitance implementation. See ref[2] for detail. Matlab m files for that purpose can also be found at 'Rabbit Hole'.

3) Some of the circuits from Ref[2] need to be optimized for switch sharing.

References:

[1] How to Determine the Parameters for Biquad Filter, By HAHAHAHA(HAx4), Version 1.0
[2] David A. Johns and Ken Martin, Analog Integrated Circuit Design, John Wiley & Sons, Inc.1997

Posted by HAx4 at 8:56 PM

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