Faculty Publications
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Publications by NITK Faculty
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Item Low voltage, low power transconductor for low frequency Gm-C filters(Springer Verlag service@springer.de, 2017) Hanumantha Rao, G.; Rekha, S.A low voltage, low power bulk-driven transconductor for low frequency Transconductance-C (Gm - C) filters filters is proposed. The transconductor is designed in UMC 180nm technology with supply voltage of 0.5V. The transconductance (Gm) is tunable from 12nS to 100nS, which is suitable for low frequency Gm - C filters. The power consumption is 120 nW. As an application, a 2nd order Butterworth low pass filter (LPF) with cutoff frequency tunable from 110Hz to 960Hz is designed. © Springer Nature Singapore Pte Ltd 2017.Item Common mode feedback circuits for low voltage fully-differential amplifiers(World Scientific Publishing Co. Pte Ltd wspc@wspc.com.sg, 2016) Rekha, S.; Laxminidhi, T.Continuous time common mode feedback (CMFB) circuits for low voltage, low power applications are proposed. Four circuits are proposed for gate/bulk-driven pseudo-differential transconductors operating on sub-1-V power supply. The circuits are validated for a bulk-driven pseudo-differential transconductor operating on 0.5V in 0.18?m standard CMOS technology. Simulation results reveal that the proposed CMFB circuits offer power efficient solution for setting the output common mode of the transconductors. They also load the transconductor capacitively offering capacitance of about 1fF to tens of femto farads. © 2016 World Scientific Publishing Company.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 Ltd