摘要
本文叙述了用光电耦合器代替直流微电流放大器中的超高电阻负反馈部分，并对其部分电路作了改进，使微电流放大器实现了高速化。文中给出了测量电路，并进行了理论分析和实验，实验结果与理论相符．
This article gives on account of the photo-coupler's replacement of the high feedback resistor in the very low level DC current amplifier, and part of the circuit is improved to achieve the high speed of the very low level amplifier. The measurement circuit is given and it is experimented andf analyzed in theory. The experrment result agrees with the theory.
