若用运算放大器和场效应晶体管(FET),就能构成一个简单的高情度恒流源,但是,负载还不允许达到高速开关程变。标准型恒流源的负载变化电流在不是太高速度情况下是1μS左右,稳定时间取决于场效应晶体管的漏极容量和运算放大器的频率特性(f) 本文介绍的电路是在恒流电路和负载之间附加一个基极接地电路,从而缩短负载高速变 Using op amps and field-effect transistors (FETs) creates a simple high-level constant-current source, but the load does not yet allow high-speed switching. Standard constant current source of the load change current is not too high speed case is about 1μS, the settling time depends on the field-effect transistor drain capacitance and operational amplifier frequency characteristics (f) This article describes the circuit in the constant current circuit and Add a base ground between the load circuit, thus reducing the load speed change