Faculty Publications

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    Widely programmable high-frequency active RC filters in CMOS technology
    (Institute of Electrical and Electronics Engineers Inc., 2009) Laxminidhi, T.; Prasadu, V.; Pavan, S.
    We propose a circuit technique that enables the realization of widely programmable high-frequency active RC filters in CMOS technology. A fifth-order Chebyshev ladder filter having a digitally programmable 3-dB bandwidth (from 44 to 300 MHz) is used as a vehicle to validate our ideas. The opamp uses feedforward compensation for achieving high dc gain and wide bandwidth. The integrating resistors are realized as a series combination of a triode-operated MOSFET and a fixed polysilicon resistor. A charge-pump-based servo loop servoes the integrating resistor to a stable off-chip resistor. The principle of "constant capacitance scaling"is applied to the opamp and the integrating resistors so that the shape of the frequency response is maintained when the bandwidth is scaled over a 7 7times; range. The filter core, designed in a 0.18-?m CMOS process, consumes 54 mW from 1.8-V supply and has a dynamic range of 56.6 dB. © 2009 IEEE.
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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.