Abstract
The switched capacitor filter (SCF) design procedure for the case when the oversampling ratio of the sampling frequency to the cutoff frequency is not much greater than 1 is proposed. The resulting filter yields a larger stopband attenuation than that traditional elliptic filter, and it compensates for the effect of the undesirable zero-order sample-and-hold. The design procedure increases the requirement of wideband signal processing, and it helps to design filters with low oversampling rates. Though the all-pole Butterworth-type transfer functions are used, the Chebyshev type or elliptic filter can be designed with little modification of the proposed procedure. >
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