微电流条件下的开关电流镜失配补偿及其在CAB中的应用

提出了一个高精确、可工作在非常微弱电流的开关电流镜电路，采用一种可以自动调整镜像MOS管栅源电压的方法进行失配补偿，可实现因物理参数失配造成输出误差的补偿.根据可重构模拟单元CAB的设计需要，提出了双相位多输出电流镜及其失配补偿电路，讨论了工作时序与可编程开关的一体化设计.所提出的设计对于20%的失配只产生小于1%的误差，电流范围1 nA~1 μA.该电路可以使用CMOS单晶工艺实现.给出的仿真结果验证了理论设计.
A high precision switched current mirror circuit working in very weak current was presented.A method,which can automatically adjust the gate source voltage for mismatch compensation of the image MOSFET’ was adopted, and the compensation for the output error caused by the physical parameter mismatch could be realized.According to the design of the reconfigurable analog unit, the dual phase multiple output current mirror and mismatch compensation circuit were put forward, and an integrated design of timing and the programmable switch was also discussed.The produced error of the proposed design is less than 1% for the 20% mismatch, and the current range is 1 nA~1 μA.This circuit can be used in CMOS single poly process.Simulation results were presented to verify the theoretical design.