基于MOSFET零温度系数工作点设计的电流基准OA

This study aimed to address the problem of current reference being sensitive to process corners and requiring per-wafer calibration,which increases costs.A novel current reference circuit design based on the zero temperature coefficient(ZTC)operating point of MOSFETs was proposed.This design eliminates the impact of process corner variations on the reference current and integrates an automatic trimming circuit for process corner detection,avoiding external trimming calibration,thereby significantly enhancing the absolute accuracy of the reference current.The circuit was designed and verified in TSMC 65 nm complementary metal-oxide-semiconductor(CMOS)process,with a total area of 0.009 mm2,a total power consumption of 103 μW at a supply voltage of 1.2 V,and an absolute accuracy of the reference voltage as high as±0.3％,with the absolute accuracy of the output reference current improved to approximately±2.5％.The design offers significant advantages in reducing production costs and improving production efficiency,and is of great importance for the low-power and miniaturization circuit demands of emerging applications such as the Internet of things and wearable devices.