Faculty Publications

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Author: search.filters.author.Rekha, S.Subject: search.filters.subject.Energy efficient

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    Ultra-low voltage, power efficient continuoustime filters in 180 nm CMOS technology
    (Institution of Engineering and Technology kvukmirovic@theiet.org, 2019) Rekha, S.; Vasantha, V.M.; Laxminidhi, T.
    The authors propose circuit techniques to implement integrated continuous-time filters for low voltage and low power applications. A fourth order Gm-C filter and a fifth order active-RC Chebyshev filter are used as test vehicles to validate the ideas. Basic building blocks are bulk driven transconductors. Gm-C filter and active-RC filter offer bandwidth of 1 MHz and 750 kHz, respectively while exhibiting a good figure of merit thus ensuring that the designs are energy efficient. Both the filters, fabricated on the same chip in 180 nm CMOS technology, operate on 0.5 V power supply. They offer a dynamic range of 45 and 46.6 dB, respectively. © The Institution of Engineering and Technology 2019.
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    A 0.6-V, 61-dB DR Fourth-Order Low-Pass Filter Using Folded Single-Branch Biquads
    (John Wiley and Sons Ltd, 2025) Muhammed Mansoor C, B.; Rekha, S.
    This paper proposes a novel, compact, and energy-efficient biquad which is derived from a folded single-branch transistorized (Formula presented.) -C structure. The biquad has a small number of active devices stacked between (Formula presented.) and GND rails and hence can be used satisfactorily in a low-voltage environment. The filter also inherits the benefits of folding in the circuit which makes the tuning of the filter easier and power independent. A fourth-order low-pass filter is used as a vehicle to illustrate the performance of the proposed biquad. The fully differential version of the filter is designed in 65-nm CMOS technology, operates with a supply voltage of 0.6 V, is biased with a current of 100 nA, has a (Formula presented.) 3-dB bandwidth of 15 kHz, and shows a dynamic range as high as 61 dB. The postlayout simulations along with FOM numbers show the superior performance of the filter. © 2025 John Wiley & Sons Ltd.