A Novel Ultra-Low-Power, Tunable, LPF and BPF Biquad Based on New Fully Differential Folded-Gain-Boosting

Biomedical sensors operate under low supply voltage, in low frequency domains, and require low power consumption. This paper proposes a new power-efficient, low-pass and band-pass fully differential biquad suitable for bio-signal acquisition, based on Folded Gain Boosting Source-Follower (FGB-SF). This solution does not require a Common-Mode Feedback (CMFB) and it offers a wide tuning range. Implemented using 0.18 μm TSMC technology, it achieves the lowest power consumption reported in the literature (0.46 nW), a high Dynamic Range (DR) of 43.8 dB, and an IIP3 of 6.55 dBm with 250 Hz bandwidth. Post-layout simulations demonstrate stability under Montecarlo and PVT variations. The occupied area is only 69.5 μm x 51.3 μm and exibits the lowest FOM compared with the state of the art.