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This paper presents a novel power and energy-efficient carbon nanotube field-effect transistor (CNTFET)-based design of a quaternary magnitude comparator for single and double digits. It also proposes an improved circuit of the ternary single-digit comparator and a novel design of the double-digit ternary comparator. The designs make use of the pass transistor logic and transmission gates, resulting in a more power and energy-efficient design with a lower number of CNTFETs when compared with existing designs. Besides, this paper also proposes a generalized circuit of magnitude comparator for multiple digits. The proposed circuits are simulated in HSPICE using the 32 nm CNTFET model presented by Stanford University. Average power and propagation delays are observed and the power-delay-product (PDP) is calculated in each case. The impact of process parameter variations has been analyzed through Monte Carlo simulation and has been presented in the form of two-dimensional graphs. [ABSTRACT FROM AUTHOR]

A novel tunable miniaturized band reject filter employing RF MEMS varactors is reported. Another tunable filter was reported by the authors to work in the Ka-band of frequencies. The present work refers to C-band application making it suitable for satellite and wireless links. Novelty of the work lies in introduction of tunability to such low frequency ranges, compactness in size, CMOS compatibility and more efficient optimized fabrications process. This level of miniaturization has not been achieved by others hitherto. A Coplanar Waveguide (CPW) on a silicon substrate consisting of a central strip conductor with semi-infinite ground planes on both sides is considered where two Complementary Split Ring Resonators (CSRRs) are in series connection on the signal line of CPW. To achieve tunability of the band reject filter, a MEMS bridge capacitor is put on the signal line of the CPW in shunt in either up or down state. The rejection of stop bands are around − 23.80 dB for down state and − 22.90 dB for up state, whereas the centre frequency is 6.5 GHz for down state and 8.1 GHz is for up state simulation and the corresponding measured data are 6.7 GHz (− 35.29 dB) and 8.0 GHz (− 42.90 dB) respectively. The frequency roll off is very sharp because of additional poles. [ABSTRACT FROM AUTHOR]