input impedence in multisim

[input impedence]

HELLO:

I have met a problem about the input impedence of the bjt,
Like it says in the attachment, the input impedence is supposed to be hfe*R5 in the range of several hundred kilo ohms, yet the result of the transfer function analysis is 314G,quite wierd.

[_user32]

Hello,

Can you include the circuit (or other attachment) that you've mentioned in your post?

Regards,

Pat Noonan

[input impedence]

sorry the last reply cann't be shown

thanks for your time:

I think the input impedence the software gave was actually large signal ones, it doesn't have other option,

I can calculate small signal input impedence with the data it gives.

Thanks again.