多点曲率补偿的带隙基准电压源设计方法

提出了一种对带隙基准电压进行多点曲率补偿的新思路,给出了它的设计原理、推导过程和一种实现电路.与传统的曲率校正方法不同,分布式曲率补偿着眼于在整个温度范围内寻找多个基准输出电压对温度的一阶导数的零点,从而限定基准输出电压随温度变化曲线的幅度,使曲线更平缓,达到提高曲率补偿效果的目的.采用ST公司的0.18μm CMOS工艺对实现电路进行了电路模拟,结果表明,在-45～120℃的温度范围内,采用该方法设计的带隙基准电源的温度系数仅为1ppm/℃.

Bandgap Reference Design by Means of Multiple Point Curvature Compensation

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℃.