Abstract: A new method,namely multiple point curvature compensation (MPCC),is proposed for the design of a bandgap reference,and its design principles,theoretical derivation,and one feasible circuitry implementation are presented.Being different from traditional techniques,this idea focuses on finding multiple temperatures in the whole range at which the first order derivatives of the output reference voltage equal zero.In this way,the curve of the output reference voltage is flattened and a better effect of curvature compensation is achieved.The circuitry is simulated in ST Microelectronics 0.18μm CMOS technology,and the simulated result shows that the average temperature coefficient is only 1ppm/℃ in the range from -40 to 125℃.

Key words: bandgap reference, curvature compensation, sub-threshold circuit