本文设计了一款双向修调电路，应用于高精度的LDO内部电压基准。突破常规的单向电阻修调方式，采用MOS开关控制的双向电阻实现双方向修调，能够很好地抵消生产工艺带来的正负偏差。基于0.35umCMOS工艺下，采用Cadence spectre 进行后仿真，结果显示，修调前最差工艺角下的偏差高达-5%～+7%，在不增加额外功耗修调后的误差仅在±2% 以内，性能显著。

A new two-way trimming circuit for bandgap reference is presented in this paper. This method is different from the one-way trimming used before, which makes the two-way trimming come true by the two-way resistance controlled by MOS switch. It can counteract the effect of production process very well. Under the simulation environment with 0.35um CMOS technology, results show that this circuit can greatly reduce the influence of technology fluctuation for the output voltage. Before trimming, the output voltage offset can arrive -5%~+7% under the worst-technology-case.This method that won’t consume additional power can promote output stability within ±2% after trimming.