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