A Design of Bandgap Reference Voltage Source with Low-voltage and High Precision Based on 0.18um Process
Chen X. Zhu · Journal of Chengdu University of Information Technology · 2013
In order to design a simple structure of bandgap reference voltage source with low-voltage and high precision,we added the start-up circuit,PSRR enhancing circuit and repairable resistor array in the core circuit of bandgap reference.Then we analyzed the effecting factor that resistance temperature coefficient influences the precision of bandgap reference voltage source through mathematical modeling,and gave the tuning idea of weakening this effecting factor.At last we determined the device size using this tuning idea.The simulation results show that,the temperature coefficient is 0.62 ppm/℃ at the temperature range of 0℃ to 140℃.In the low frequency,the power supply rejection ratio is-66.9dB.The minimum of power supply voltage is 1.1V.The power consumption is 453.9uW.The results showed that we can futher reduce the temperature coefficient of bandgap reference voltage source using this tuning idea.