And insulating ring technology is adopted to further improve inputimpedance influenced by insulating resistance of printed circuit board.
印刷电路板上加绝缘环，消除了线路板绝缘电阻对放大电路输入阻抗的影响。
2
In circuit design, the mathematical model of operational amplifier expanded function is expanded circuit. The circuit includes phase electric capacity, the feedback resistance and the inputimpedance.