如图25所示三极管放大电路的输入电阻是:( )。A、RB1∥RB2∥rbe B

练习题库2022-08-02  27

问题 如图25所示三极管放大电路的输入电阻是:( )。A、RB1∥RB2∥rbeB、RB1∥RB2∥[rbe+(1+β)RE1]C、RB1∥RB2∥[rbe+(1+β)(RE2+RE1)]D、RB1∥RB2∥[rbe+(1+β)RE2]

选项 A、RB1∥RB2∥rbe
B、RB1∥RB2∥[rbe+(1+β)RE1]
C、RB1∥RB2∥[rbe+(1+β)(RE2+RE1)]
D、RB1∥RB2∥[rbe+(1+β)RE2]

答案 B

解析 由微变等效电路可以得到
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