A CMOS Elliptic Switched-Current Filter Using Bilinear Implementation

A CMOS elliptic switched-current (SI) ladder filter, employing bilinear SI integrator, has been proposed. The filter is based on the bilinear S-*Z transformation ,which results in a simple circuit realization using switched-current. Cutoff frequency of the filter is 1 MHz and with bilinear implementation, we achieve 1 db passband ripple and stopband attenuation greater than 30 db. A 5th-order SI filter example is given in this paper. ASIZ simulation results for frequency response verity the technical requirement.