Ultra-low voltage, power efficient continuous-time filters in 180 nm CMOS technology

Abstract

The authors propose circuit techniques to implement integrated continuous-time filters for low voltage and low power applications. A fourth order G m-C filter and a fifth order active-RC Chebyshev filter are used as test vehicles to validate the ideas. Basic building blocks are bulk driven transconductors. G m-C filter and active-RC filter offer bandwidth of 1 MHz and 750 kHz, respectively while exhibiting a good figure of merit thus ensuring that the designs are energy efficient. Both the filters, fabricated on the same chip in 180 nm CMOS technology, operate on 0.5 V power supply. They offer a dynamic range of 45 and 46.6 dB, respectively.