关键词: 上电复位电路, Brokaw带隙基准, 电流比较电路, 迟滞

Abstract: In order to solve the traditional influence of process and temperature on the threshold voltage of the power supply in the power-on reset circuit, an power-on reset circuit is proposed, which is composed of sampling circuit, current comparison circuit and level shift circuit, and it can accurately judge the reset. The design with hysteresis is added to reduce the influence of power noise on output circuit. The POR circuit was simulated based on 0.5 μm CMOS process. The results show that the circuit works at 5 V supply voltage, the power threshold is 3.19 V under typical process and temperature, and the influence of different process and temperature on power threshold is small, and the error range is 0.31% - 4.7%.

Key words: power-onresetcircuit, Brokawbandgap, currentcomparisoncircuit, hysteresis