Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Hanumantha Rao, G.

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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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    A 0.5 V, 1 nA Switched Capacitor PTAT Current Reference Circuit
    (Institute of Electrical and Electronics Engineers Inc., 2019) Hanumantha Rao, G.; Rekha, S.
    This paper presents a low voltage, low power Proportional to Absolute Temperature (PTAT) current reference circuit. Switched capacitor is used instead of a large resistor, which in turn reduces the area of the circuit and makes the circuit less process sensitive. The proposed circuit has been designed using UMC 65 nm CMOS technology and simulated in Cadence Virtuoso. It generates a reference current (Iref) of 1 nA at 0.5 V supply voltage (Vdd) at room temperature (27°C) and follows PTAT characteristics in the temperature range of -10°C to 80°C. The total power consumption of the circuit is as low as 1.5 nW. The supply voltage sensitivity of Iref is 2.7 %/V, which shows that the proposed circuit is less sensitive to supply voltage variations. Index Terms - Low voltage, Low power, PTAT current, Switched capacitor. © 2019 IEEE.
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    A 0.8 V, 5 nA PTAT current reference circuit with improved supply voltage sensitivity
    (Institute of Electrical and Electronics Engineers Inc., 2019) Hanumantha Rao, G.; Muhammed Mansoor, C.B.; Rekha, S.
    This paper presents a low voltage, low power Proportional to Absolute Temperature (PTAT) current reference circuit with improved supply voltage sensitivity. The proposed circuit is designed and laid out in UMC 65 nm CMOS technology and simulated using Cadence Virtuoso. It generates a reference current (Iref) of 5 nA at 0.8 V supply voltage (Vdd) at room temperature (27°C). Composite transistors are used to improve the supply voltage sensitivity when compared to a traditional beta-multiplier circuit. The current reference circuit consumes a power of 8 nW and follows PTAT characteristics in the temperature range of 0°C to 80°C. The supply voltage sensitivity of Iref is 2.6 %/V, which shows that the proposed circuit is less sensitive to supply voltage variations. © 2019 IEEE.