low current amplifier

The experiment shows that if the current amplifier factor is big, Junction J_3 is hard and the ineffective trigger branch current is low, the turn-on time can be shorten effectively.

实验结果指出，器件的电流放大系数器件大j、3结特性硬，无效触发分流小，可有效地缩短开通时间。

The traditional power meter calibrating system usually has the shortcomings of low efficiency and large volume due to its standard voltage and current source rely on the analog amplifier.

传统的电力校表台由模拟功放向待校电表及标准表提供校表电流，造成系统效率低、体积大、重量重。

An OPA128 operational amplifier with extreme low bias current and big gain is adopted for enhancing the response to weak signals.

同时为了保证测量精度，采用偏置电流极低的运算放大器opa128，并且增大了反馈电阻，以增强对弱信号的响应。