Turkish Journal of Electrical Engineering and Computer Sciences
Abstract
A CMOS current-mode exponential circuit is designed by plugging candidate circuits into a Taylor's approximation circuit to make a multiple-segment circuit. The selection of candidate circuits is dependent on a large linearity range in each segment. The proposed range-segmented circuit is different from all segments constructed only by quadratic circuits or only by linear circuits. The proposed circuit was simulated using UMC 0.18~$\mu$m CMOS technology. The output linearity of the circuit is 56.7~dB for gain error less than 0.5~dB, and the --3~dB bandwidth of the circuit is between 69 and 150~MHz for input range from --63 to 198~$\mu$A.
DOI
10.3906/elk-1811-32
Keywords
Exponential circuit, multiple-segments circuit, current-mode circuit, quadratic circuit
First Page
2475
Last Page
2487
Recommended Citation
CHENG, C, LIN, K, & CHEN, J (2019). Design of a range-segmented CMOS current-mode exponential circuit. Turkish Journal of Electrical Engineering and Computer Sciences 27 (4): 2475-2487. https://doi.org/10.3906/elk-1811-32
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Computer Engineering Commons, Computer Sciences Commons, Electrical and Computer Engineering Commons
