Compared between the pseudo-exponential and Taylor series approximation functions, the “pseudo-exponential” generator in which the exponential function is expressed as: exp(2x)=(l+x)/(1-x) is difficultly implemented due to the requirement of division function (i.e. (1+x)/(1-x)). Since, MOS transistors have square law characteristic in saturation region, the Taylor approximation, which follows a squaring function and comprises only additive functions as shown in Eq. (2), is easily implemented [9]. At present, current-mode signal processing circuit techniques have received considerable attention owing to the fact that their bandwidth, linearity, and dynamic range performances are better than voltage-mode signal processing circuit technique [10]. In the past, several current-mode exponential function generators have been reported [1], [5], [6], [8], [9]. In this paper, we present a simple low-voltage and lowpower, current-mode exponential function generator based on Taylor series approximation. The proposed circuit is suitable for CMOS implementation.