A High-Precision Bandgap Reference With a V-Curve Correction Circuit
Chang-Chi Lee, Hou-Ming Chen, Chi-Chang Lu, Bo‐Yi Lee, Hsien-Chi Huang, He-Sheng Fu, Yongxin Lin
Abstract
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 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . 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.