Abstract
A new current-mode fractional-power CMOS circuit such as cube-root and squared-cube-root configurations that give output signal in four quadrants has been presented for the first time. MOSFETs utilized in the design exploit translinear principle in weak-inversion region. The second-order effects on the circuit proposition have been analysed. The implementation justification has been validated by post-layout simulation on Virtuoso-SPECTRE tool with 180 nm GPDK CMOS process parameters. It has been found that using ± 0.5 V supply voltage, the realized cube-root and squared-cube-root circuits work for an input range of ± 30 µA while consuming few hundred nano-watts of static power and exhibit a maximum of ± 1 dB error over a wide input range of ± 1.5 µA to ± 30 µA in all four quadrants. Utility of the proposed circuits, as companding and gamma corrector, has also been elaborated.
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Srivastava, P., Sharma, R.K. & Ranjan, R.K. On the Realization of Current-Mode Four-Quadrant CMOS Fractional Power and Cube-Root Converter. Arab J Sci Eng 47, 13837–13855 (2022). https://doi.org/10.1007/s13369-021-06488-5
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DOI: https://doi.org/10.1007/s13369-021-06488-5