A 0.8V CMOS filter based on a novel low voltage operational transresistance amplifier

摘要

Operational transresistance amplifier (OTRA) is suited for low voltage operation since it minimizes stacking of transistors due to the use of shunt-shunt feedback topology. A second order low pass filter with independent tuning of DC gain, cutoff frequency and Q factor was designed based on the Tow-Thomas biquad, using a novel low voltage OTRA in 0.18μ CMOS technology. The filter operates at a supply of 0.8V, has a 3dB cutoff of 600KHz, VIP3 of 2.85V, input referred spot noise at 1KHz of 115nV/(Hz){sup}(1/2) and consumes 0.7mW power.