A High-Precision Bandgap Reference With a V-Curve Correction Circuit

• Main Authors: Chang-Chi Lee, Hou-Ming Chen, Chi-Chang Lu, Bo-Yi Lee, Hsien-Chi Huang, He-Sheng Fu, Yong-Xin Lin
• Format: Article
• Language: English
• Published: IEEE 2020-01-01
• Series: IEEE Access
• Subjects: Bandgap reference; line regulation; temperature coefficient (TC); temperature drift; v-curve correction (VCC) circuit
• Online Access: https://ieeexplore.ieee.org/document/9052729/
• ISSN: 2169-3536

In this study, a precision bandgap reference with a v-curve correction (VCC) circuit is presented. The proposed VCC circuit generates a correction voltage to reduce the temperature drift of the reference voltage and achieves a low temperature coefficient (TC) in a wide temperature range. The proposed bandgap reference was designed and fabricated using a standard TSMC 0.18-$\mu \text{m}$ 1P6M CMOS technology with an active area of 0.0139 mm². The measured results show that the proposed bandgap reference achieves a TC of 1.9-5.28 ppm/°C over a temperature range of -40°C to 140 °C at a supply voltage of 1.8 V. In addition, the circuit demonstrated a line regulation of 0.033 %/V for supply voltages of 1.2 - 1.8 V at room temperature.