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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0.18μmCMOS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/℃.
A new idea of multi-point curvature compensation for band-gap reference voltage is proposed, and its design principle, derivation process and an implementation circuit are given.Different from the traditional curvature correction method, Temperature range to find a number of reference output voltage on the temperature of the first derivative of the zero point, so as to limit the reference output voltage with the temperature curve of the amplitude, so that the curve is more gentle, to achieve the purpose of improving the curvature compensation using ST’s 0.18μmCMOS process The circuit simulation is carried out. The results show that the temperature coefficient of the bandgap reference power supply designed by this method is only 1ppm / ℃ within the range of -45 ~ 120 ℃.