0.5V 32nW Inverter-Based Gm-C Filter for Bio-Signal Processing

This paper presents an ultra-low-power, low-voltage universal multi-mode Gm-C filter, designed in CMOS technology. The proposed filter uses only three transconductance operational amplifiers (OTAs) operating in a sub-threshold region: this leads to a significant reduction in energy consumption compared to previous solutions reported in the literature. Furthermore, the proposed filter can operate in four different functional modes, namely voltage, current, transconductance, and trans-resistance, without requiring extra active elements. Finally, the proposed filter for the band-pass responses features a power consumption of 32nW with a voltage supply of 0.5V, with a center frequency of 462Hz which can be considered for biomedical applications.