Conference Papers

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    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.
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    Low voltage current reference circuit with low temperature coefficient
    (Institute of Electrical and Electronics Engineers Inc., 2018) Amaljith, M.K.; Hanumantha Rao, G.; Rekha, S.
    Current references are necessary building blocks of every integrated circuit where they are used for biasing analog circuits such as filters, oscillators, phase locked loops, etc. This paper describes the design of a low voltage, low power 10 nA current reference. The proposed current reference circuit is based on a simple design methodology which uses the principle of subtraction of two positive temperature coefficient currents. The circuit is made to operate in sub-threshold region with a supply voltage of 0.5 V. The proposed circuit has been designed and simulated in Cadence Virtuoso with gpdk 180-nm CMOS process. The temperature coefficient of the reference current is 186 ppm/° C over a range from 0 to 80° C and the variation with supply voltage is 8.02%/V. The total power consumption of the circuit is as low as 45.887 nW. © 2018 IEEE.
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    Ultra low voltage, low power active-RC filter in 90 nm CMOS technology
    (Institute of Electrical and Electronics Engineers Inc., 2019) Yeshwanth, Y.P.; Prasad, T.P.V.; Mudadla, V.; Pavan; Rekha, S.
    In this work, an ultra low voltage, second order low pass active-RC filter is designed in 90 nm CMOS process. A bulk-driven transconductor and a feed-forward compensated operational transconductance amplifier (OTA) are used as building blocks of the filter. Operating with a supply voltage of 0.5 V, filter exhibits a low pass Butterworth response with a cutoff frequency of 1 MHz. A mathematical model of the filter is developed using descriptor state-space equations for optimizing the filter response. The designed filter consumes a power as less as 91.99 μW with a figure of merit (FoM) of 3.39 fJ/pole. © 2019 IEEE.