A 1.4-µW 24.9-ppm/°C Current Reference With Process-Insensitive Temperature Compensation in 0.18-µm CMOS

Abstract

This paper presents a trim-free low-voltage and low-power CMOS current reference which achieves high current stability to temperature variation . In order to achieve process-in- sensitive temperature compensati on, the proposed circuit employs ratio between the process-independent temperature coef ficients of resistor and compensation volt age. The proposed current refer- ence is implemented in 0.18-µm CMOS technology and consumes 1.4 µW from a 1-V supply. It achieves temperature coef ficient of 24.9 ppm/°C with 0 °C to 100 °C of temperature variation without trimming, which is the lowest among the recently reported CMOS current references.