A Novel Second-order Curvature Compensation Structure for Bandgap Reference Sources
Throughthe in-depthstudy of the temperature characteristics of the base emitter voltage VBE,the line-ar term and the high-order function relationship related to absolute temperature in VBE are derived.On this basis,a circuit is designed that can generate acurrent proportional to the square of the absolute temperature,and superim-pose the current on the traditional bandgap reference source to further reduce the temperature coefficient.The CSMC0.18 umstandard CMOS process is used for simulation,and the reference source temperature coefficient after second-order curvature compensation is 8.8ppm/°C.
bandgap reference sourcetemperature coefficientsecond-order curvature compensationtemper-ature-independent current
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维普
