Author(s)

Hui Wang,Tao Zhang, Jing Liu

Corresponding Author

Hui Wang

ABSTRACT

Aiming at the widely used Buck DC-DC converter, a negative feedback loop for Buck DC-DC power management system is designed in this paper, considering the influence of the voltage accuracy generated by the bandgap reference source on the system output. Based on the analysis of the traditional BJT-based voltage reference source, this paper selects TSMC 65nm CMOS process and performs simulation in the temperature range of -40℃ to 90℃. When the input voltage is 5V, the temperature coefficient of the reference source is 5.3×10‾6ppm/℃, and power supply rejection ratio(PSRR) is -65.8dB@dc, all of which show good performance.

KEYWORDS

Buck DC-DC; bandgap reference source; temperature coefficient(TC); power supply rejection ratio(PSRR)