An Electronically Tunable Low Power Low Pass Filter Employing Capacitor Multiplier for Biomedical Applications

In this work, a novel 0.9nW low pass filter is proposed using 0.18µm TSMC technology in Cadence environment to reject unwanted signals of biomedical applications. Active RC filter is designed with a new capacitor multiplier implementation providing high multiplication factor along with low power consumption. The designed circuit operates with ±0.3V supply voltages with DTMOS technique. At the same time, the power consumption of the proposed circuit is very low that can be implemented in implantable devices. The bandwidth of the designed filter is adjustable between 500mHz and 65Hz. In terms of Figure of Merit, the proposed filter outperforms the recommended circuits in the literature.