PNP Transistor voltage calculation

  • #1
sJWddht.jpg


For the B) part, I don't get why is it that for calculating voltage between collector an the emitter (Vce) I take into account diode on base (0.7V), whereas for part A) it's ignored?

Why is Vce in part A and part B are calculated differently? Why is it that in part A voltage of 0.7V isn't taken into account? I get that if βf = infinite, and βf = ic/ib ib -> 0
 

Answers and Replies

  • #2
Baluncore
Science Advisor
8,505
3,214
The thread title refers to PNP but the diagram shows NPN. What gives?

What is the origin of the image you inserted? How reliable is it?

In the first circuit base bias comes from the collector voltage so it limits the lowest voltage on the collector with Vc > Vb.
In the second case the transistor is being modelled on the edge of saturation with Vc = Vb.
 

Related Threads on PNP Transistor voltage calculation

  • Last Post
Replies
22
Views
16K
Replies
60
Views
9K
  • Last Post
Replies
9
Views
198
  • Last Post
Replies
4
Views
3K
  • Last Post
2
Replies
25
Views
5K
Replies
2
Views
12K
  • Last Post
Replies
9
Views
3K
  • Last Post
Replies
7
Views
3K
Replies
19
Views
1K
  • Last Post
Replies
6
Views
6K
Top