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用信号流图计算反馈放大器的输入输出阻抗，并进一步明确在分析反馈放大器不同指标时，所采用的反馈深度的具体含义。
The signal flow diagram is used to calculate the input and output impedance of the feedback amplifier, and the specific meaning of the feedback depth used in the analysis of different indexes of the feedback amplifier is further clarified.