FET Amplifier Impedance

  • Thread starter MHR-Love
  • Start date
  • #1
17
0

Main Question or Discussion Point

Hi guys,
can anyone tell me the reason why we set Vi=0 (short circuit the input side) when we want to find the output impedance Zo but we don't do the same by setting Vo=0 when we find the input impedance Zi????
and why do we let Io=0 (open circuit the output side) to find the gain Av????

thank you
 

Answers and Replies

  • #2
272
0
Think of what is happening in the FET from the point of view of impedance. The collector-emitter side can be viewed as a current source. What are the implications of this?
 

Related Threads on FET Amplifier Impedance

  • Last Post
Replies
8
Views
6K
  • Last Post
Replies
1
Views
6K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
5
Views
4K
  • Last Post
Replies
2
Views
6K
  • Last Post
Replies
5
Views
2K
Replies
2
Views
2K
  • Last Post
Replies
5
Views
2K
Replies
3
Views
3K
  • Last Post
Replies
6
Views
4K
Top