Realization of high-Q bandpass filters using CCCIIs

Abstract

A new configuration for the realization of very high-Q filters with electronically controllable filter parameters is presented. For this purpose, first, a modification for the translinear CMOS CCCII and then, a new high-performance first-order allpass filter section are proposed. The main parameters of the resulting high-Q bandpass filter, ie. the center frequency and pole-Q can be independently adjusted via DC bias currents. It is also shown that the filter sensitivities with respect to capacitors mid intrinsic resistances are low. SPICE simulation results verify the theoretical analyses.