Abstract: Bandgap voltage reference is a basic module in a high accuracy analog circuit design. For high resolution ADC, the accuracy of reference voltage is critical for the whole design. A high precision bandgap voltage reference is needed to provide high accuracy reference voltages. A traditional bandgap reference is hard to meet the accuracy requirement for all the technology corners. In this paper, a programmable high precision bandgap reference is presented, which can solve the problem motioned above. This design adopts Smic 0.18 µm 1P4M CMOS technology. The theoretically achievable temperature coefficient approaches to 0.69 ppm/ °C over the commercial temperature range.

Key words: Bandgap reference, high precision design, second-order curvature compensation, low temperature coefficient, 高精度设计, 二阶曲线补偿技术, 低温度系数