When the components, such as resistor, capacitor, inductor, diode and transistor are used in the high-frequency circuits, they have their own high-frequency equivalent models.
为了进一步分析实验中具体电路的实际情况，首先要建立分立元器件的高频等效模型。
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In this paper, digital potentiometers X9C103 to change the high-frequency amplifier feedback resistor to achieve the control feedback purposes.