A novel current reference with low temperature coefficient in a large temperature range

This paper firstly analyse a principle to realize curvature compensated method for CMOS current reference. The circuit of the current reference with very low temperature coefficient is optimized by adjusting some of given parameters according to simulation results. The designed circuit implemented by SMIC 0.18mum CMOS process, and the simulation results show that the temperature coefficient of the current reference is 9.7ppm/degC in a large temperature range from -100 degC to 130 degC, and the power supply rejection ratio (PSRR) is 80dB at 30kHz