Design of a range-segmented CMOS current-mode exponential circuit

Chih Jen Cheng, Kuo Jen Lin, Jwu E. Chen

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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 µm 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 µA.

Original languageEnglish
Pages (from-to)2475-2487
Number of pages13
JournalTurkish Journal of Electrical Engineering and Computer Sciences
Issue number4
StatePublished - 2019


  • Current-mode circuit
  • Exponential circuit
  • Multiple-segments circuit
  • Quadratic circuit


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