一种利用门电路实现可靠启动的基准电流源

Reliable startup of bandgap reference current source by using gate circuit

为了解决电流和模式的基准电路的潜在启动失败问题以及使电路更加低功耗、低复杂度、高稳定性,提出了一种利用数字门电路实现可靠启动的CMOS带隙基准电流源。Spectre仿真表明,在1.8 V电源电压下,功耗为180μW,电路输出20μA参考电流,温度系数为11.9 ppm,线性度为1 054 ppm/V,输出噪声电压为0.1 mV,电源抑制比为-42 dB。采用TSMC0.18μm CMOS工艺流片。测试结果表明,电路能在15.4μs内实现可靠启动,输出参考电压稳定在1.28 V,其温度系数为89 ppm。该基准电流源已经成功地应用于工业自动化无线传感网(WIA)节点芯片的频率综合器中,并取得良好的应用效果。

A reliable and fast startup circuit of CMOS bandgap reference(BGR)current source,which is realized by a digi-tal gate circuit,is proposed to solve this problem of potential fail to start up BGR circuit with current sum mode to the correct working state and make BGR less power,less complicate and higher stability. Spectre simulation shows BGR circuit can output 20 uA reference current with temperature coefficient of 11.9 ppm and linearity of 1 054 ppm/V at 1.8 V supply voltage. What′s more,the output noise voltage is 0.1 mV and PSRR is -42 dB. With TSMC0.18um CMOS process,the measured results indi-cate that BGR circuit can reliably start up in 15.4 us,whose output reference voltage is stabilized at 1.28 V and temperature co-efficient is 89 ppm at -40~125 ℃. The bandgap reference current source has been successfully applied to the frequency synthe-sizer in the node chip in WIA for industrial automation.