Abstract This paper presents a process-independent, curvature-compensated bandgap reference. By introducing a temperature-adaptive duty-cycled resistor to scale the PTAT voltage, the design effectively compensates for CTAT nonlinearity without introducing offset errors. Fabricated in 0.18μm CMOS, the prototype chip occupies 0.068mm2 and consumes 15μA. After twopoint trimming, it achieves an average temperature coefficient of 1ppm/°C and a 3σ output accuracy within ±0.066%. A bandgap voltage reference (BGR) with low temperature drift and high accuracy is crucial for high-precision circuit systems. Therefore, current research focuses on reducing the temperature coefficient (TC) and improving voltage accuracy [1-7]. To address these design challenges, this work proposes a process-independent curvature compensation method, by utilizing a duty-cycled resistor (DCR) to generate a nonlinear proportional-to-absolutetemperature (PTAT) voltage. Ultimately, an optimal low temperature drift of 0
Jiaqing Rui1, Liangjian Lyu1, Yuting Wan1, Kexin Shan1, Wenxian Gu1, C.-J. Richard Shi2, Xing Wu1
East China Normal University, Shanghai, China, 2University of Washington, Seattle, WA