Sixth order baseband variable LPF using new tunable operational amplifier

Abstract

A sixth order reconfigurable low pass filter (LPF) is realized in this paper using 0.25µm CMOS technology model. The filter is based on cascading connection of bi-quadratic Active-Gm-RC cells. The Active-Gm cells are realized using compensated op-amps with variable transconductance gain and variable compensation capacitors (Variable Gm-Cc op-amp). The tuning range of the filter's cutoff frequency is from 77.4 KHz to 37.78MHz. The filter operates from single supply of 1.7V. Simulations results using PSPICE for the proposed reconfigurable LPF are presented. Comparisons with previous work in [1] are included to view the points of strength for the proposed architecture.