Realization of PVT Independent Current-Mode CMOS Exponential Circuit

This paper presents a CMOS current-mode exponential circuit using CMOS technology. The design is insensitive to process, voltage, and temperature (PVT). The circuit is based on the Tylor series approximation of the exponential function and employs MOSFET operating in saturation. CADENCE Virtuoso tools are used to simulate the proposed design functionality in 0.18 µm of TSMC CMOS technology. The circuit is powered by a (Formula presented.) 1.25-volt DC source and has normalized input range of (Formula presented.) 1. The maximum temperature error of the circuit is (Formula presented.) 0.13 dB over a range of 100°C. The circuit can be used in applications up to 1.25 MHz of applications.