bipolar techniques for AGCs and VGAs are not compatible for monolithic CMOSbased analog and mixed-signal circuits. There are two techniques to generate the exponential characteristics. The first is the pseudo-exponential generator [1]-[5]. The second is the Taylor series expression [6]-[7]. In this paper, the Taylor series expression is used for realizing the exponential characteristics. A general exponential function, based on the Taylor series expansion, can be expressed as