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Comments on "Improved Accuracy Pseudo-Exponential Function Generator With Applications in Analog Signal Processing

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3 Author(s)
Karanjkar, N.V. ; Dept. of Electr. Eng., Indian Inst. of Technol. (IIT), Mumbai, India ; Sahoo, R.R. ; Baghini, M.S.

Recently a new CMOS current-mode pseudo-exponential function generator circuit was reported by Popa. The entire analysis and exponential function generator circuit, given in Popa's paper, is based on a current-squaring circuit module. In this comment paper we show that the current-squarer circuit, presented in Popa's paper, does not work as a current squarer. Consequently the pseudo-exponential generator also does not work as described in Popa's paper. We present a detailed mathematical analysis in this paper to derive its actual operation. Simulation results of the circuit module using Mentor Graphics custom IC design tool set, in a TSMC 0.18-μm CMOS process, are also shown in this paper. Simulation results match the behavior predicted by mathematical analysis.

Published in:

Very Large Scale Integration (VLSI) Systems, IEEE Transactions on  (Volume:18 ,  Issue: 9 )