A 1.8-V 1.9-ppm/°C 0.042% Inaccuracy CMOS Bandgap Reference with Curvature Compensation

A high-precision bandgap reference (BGR) is proposed in this paper. A detail analysis of various error sources is provided. The non-PTAT errors are removed with the use of offset cancellation and curvature compensation technique, and the residual PTAT errors can be eliminated by a single room temperature trim. The proposed BGR is implemented in a 180nm CMOS process and the active area is 0.059m$\mathrm{m}^{2}$. The simulation results show that the temperature coefficient (TC) is 1.9 ppm/°C with a temperature range of −40-125°C. The variation coefficient σ/μ of the output voltage is 0.042%.