Transistor in saturation region

  • Thread starter erece
  • Start date
  • #1
erece
72
0
when transistor is operated in SATURATED REGION , then for npn transistor BC junction becomes forward biased and holes will move from base to the collector, so more holes should be provided by the battery to the base terminal.
So if this is the case then base current should increase . But when we analyse the common emitter configuration then on applying KVL to input loop we get base current same in both active region and saturation region. How this is contradicting my previous conclusion of " increase in base current"
 

Answers and Replies

  • #2
es1
324
0
I have to admit I didn't really follow the logic but maybe this will help:

You have to also consider what lowered Vc to saturate the NPN. For the standard NPN common emitter what you should find is if the biasing network is holding Ib constant then Ic will have to drop, i.e. the collector resistor gets larger, to saturate the NPN. So for this particular application, although Ib stays constant, Ic/Ib drops.
 
  • #3
NascentOxygen
Staff Emeritus
Science Advisor
9,242
1,073
when transistor is operated in SATURATED REGION , then for npn transistor BC junction becomes forward biased and holes will move from base to the collector, so more holes should be provided by the battery to the base terminal.
So if this is the case then base current should increase . But when we analyse the common emitter configuration then on applying KVL to input loop we get base current same in both active region and saturation region. How this is contradicting my previous conclusion of " increase in base current"
Does this thread help? https://www.physicsforums.com/showthread.php?t=636127
 
  • #4
erece
72
0
is it not necessary for a good designer to look inside working of devices ??
 

Suggested for: Transistor in saturation region

Replies
1
Views
1K
  • Last Post
Replies
5
Views
1K
Replies
4
Views
560
Replies
3
Views
426
Replies
2
Views
465
Replies
41
Views
2K
  • Last Post
Replies
9
Views
2K
Replies
19
Views
803
Replies
1
Views
638
Top