And insulating ring technology is adopted to further improve input impedance 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。

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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 input impedance.

运算放大器扩展功能，在电子电路设计中其数学模型为放大电路，含移相电容、反馈电阻及输入阻抗。

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