A 2.2ppm/°C compensated bandgap voltage reference with a double-ended current trimming technique

Abstract

This paper presents a high-precision bandgap voltage reference (BGR) with a double-ended current trimming technique. A high-order curvature compensation method is adopted to compensate for the nonlinearity of V_BE. The proposed trimming technique using the one-time programmable (OTP) programming cancels the errors caused by process variation and enables bulk production, which achieves a best TC of 2.2ppm/°C from -40°C to 125°C. The proposed BGR is fabricated in a 0.18-um BCD process with an active area of 0.329mm². The line sensitivity is 0.18%/V operating from 2.9V to 3.6V.