Influence of CMOS CCII Parasitics in Realization of Two-Integrator Band-Pass Filter

In this paper we examine the influence of CMOS CCII non-idealities in an IC realization of a two-integrator Biquad. We compare two CMOS-CCII realizations of the Biquad; the same basic topology of the translinear CCIIs, but the W/L ratios of their transistors are optimized differently. One CCII possesses fewer non-idealities, while the other operates at higher frequencies. It is shown how the CCII nonidealities, causing lossy integrators, are applied in the Biquad design. Realizability constraints are given. With the example of a fourth order 1MHz/100kHz BP filter, post-layout simulations with AMS 0.35-micron technology using Cadence, show close agreement with our analysis.