A Novel Exponential Voltage-to-Current Converter

Abstract

In this paper, a novel method to build a complementary metal oxide semiconductor (CMOS) exponential voltage-to-current converter has been developed. The method is based on a modular design approach in which increasing the dynamic range of the system--to any required value--is done by simply adding more cells. The method is based on a pulse width modulation technique to generate a pulse signal that is used to activate a number of cascaded integrators. Based on the presented method, a novel exponential voltage-to-current converter is introduced with an achieved dynamic range of 42 dB. The circuit operates from a single supply of 3 V. Simulation results are based on Mietec 0.5 μm CMOS technology.