International Journal of Multidisciplinary Research and Development

Authors
Wang Li, LI Xiankun, XUAN Zhibin, LU Feng

Abstract
Because the conventional bandgap reference voltage source with low power supply rejection (PSR) and narrow input voltage. Based on SMIC0.18?m BiCMOS process, use two bipolar transistors in saturated region while forming base and emission voltage ?VBE, a novel high PSR bandgap voltage reference circuit with wide input voltage and small temperature coefficient was proposed, independent of supply voltage reference current source circuit owns the feature of changing with the temperature, which decreases the effect of temperature towards the output reference voltage. Spectre simulator results showed that output reference voltage VREF = 1.206V ± 1mV in the range of -55 ? to 125 ? with a supply voltage from 1.5V to 5V.The temperature coefficient was 6.562ppm/?, and the PSR was -87.49dB at 1KHz with the supply voltage of 5V.