Faculty Publications
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Item A 0.3?V, 56?dB DR, 100?Hz fourth order low-pass filter for ECG acquisition system(Elsevier Ltd, 2019) Polineni, S.; Hanumantha Rao, G.; Rekha, S.; Bhat, M.S.This paper proposes an extremely low voltage, low power bulk-driven voltage follower (BD-VF). As an application of the proposed BD-VF, a 4th order low-pass filter (LPF) with cutoff frequency adjustable from 50 Hz to 250 Hz is designed for electrocardiogram (ECG) acquisition systems. The filter is implemented in UMC 180 nm CMOS technology occupying only 0.03 mm2 area. Post layout simulation results show that the filter offers 56 dB dynamic range even with an extremely low supply voltage of 0.3 V. The total power consumption of the filter is 4.8 nW for a cutoff frequency of 100 Hz. The Figure-of-merit (FoM) and capacitance/pole of the filter are 5.7 × 10?15 and 2.2 pF respectively. The proposed filter offers the lowest FoM compared to the state-of-the-art nW-class filters. © 2019 Elsevier LtdItem An area-efficient, large time-constant log-domain filter for low-frequency applications(John Wiley and Sons Ltd vgorayska@wiley.com Southern Gate Chichester, West Sussex PO19 8SQ, 2020) Hanumantha Rao, G.; Rekha, S.This paper proposes a simple technique to increase the time constant of a log-domain filter. By using the proposed technique, the capacitor value can be reduced considerably; hence, overall area of the circuit can be reduced. A second-order log-domain low-pass filter (LPF) is implemented in UMC 65-nm complementary metal-oxide semiconductor (CMOS) technology to validate the proposed technique. It occupies an area as low as 0.005 mm2 and operates with a 0.5-V supply. For a cutoff frequency of 100 Hz, the filter consumes a power of 4 nW. By adjusting the bias current, the cutoff frequency can be linearly tuned from 10 to 500 Hz. The filter has the figure of merit (FoM) of 0.68×10?13 J, which is on par with many designs listed in the literature. The filter uses the lowest capacitance/pole (0.92 pF) among the similar designs given in the literature, which shows that the present design is area efficient. © 2019 John Wiley & Sons, Ltd.