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]正确答案B
如图25所示三极管放大电路的输入电阻是:()
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]正确答案B