从并联电压负反馈的角度，对输入电阻和输出电阻给出了下列4种方法的定量讨论。
From the negative feedback aspect of the parallel voltage, this paper quantitatively discusses input and output resistances by employing 4 methods.
所谓负反馈是指输出信号的一部分被送回输入端，与输入信号相减，从而削弱了有效输入信号。
Negative feedback occurs when a portion of the output signal of an amplifier is fed back and subtracted from the input signal, causing a reduction in the effective input signal.
电路中引入负反馈，使输入、输出电阻均发生变化，并且输入、输出电阻对放大电路有很大的影响。
The introduction of the negative feedback in circuit changes the input and output resistances, which have great influence on magnifying circuit.
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