A Programmable Wide-Range Temperature Compensated Current Reference

Abstract

This paper presents a programmable current reference for analog and mixed signal system. The proposed circuit was designed in a standard 65nm CMOS process. Current reference is an IP hard core with temperature independent (TIND) current and proportional to absolute temperature (PTAT) current, the IP core has built-in op amp and a bias for temperature compensated, the simulation results show temperature coefficient (TC) of ITIND, IPTAT10, IPTAT20 and IPTAT40 as low as 20 ppm/°C, 1111.11 ppm/°C, 2222.22 ppm/°C, 4444.44 ppm/°C over a temperature range of 180°C (55°C to 125°C) respectively. It consumes 1.44mW in global mode, while operating on 1.2V power supply, its area is only $145\mu\mathrm{m}\times 235\mu\mathrm{m}$.