A Floating Gate MOSFET Based Current Reference with Subtraction Technique

Abstract

In this paper we propose a scheme for generating a reference current which can be implemented in the CMOS technology. The system performance is investigated for a range of supply voltages and temperature. The dependency of CMOS Current reference on supply voltage and temperature is compensated by simply subtracting two current outputs with the same dependencies on the supply voltage and temperature. The system performance is improved by the use of Floating Gate MOSFET. The work includes the mathematical modeling of the proposed current reference circuit and its verification by simulation using TANNAR EDA tools. The layout of the proposed circuit is also prepared. The circuit performance over temperature and supply voltage is better than the prior works in this area. The current reference shows the supply and temperature dependencies of 520 ppm/V and 312 ppm/oC, respectively. The current reference can operate down to 0.9V supply.