00:01
Hello everyone let's take a look at this question.
00:02
Now this circuit is already given to us.
00:05
From this when we do dc circuit analysis we have ie equal to 1 .37 milliampere and bp equal to 26 millivolts.
00:16
So from this we can calculate re which is equal to bp divided by ie so which is equal to 26 divided by 1 .37 milliampere.
00:27
So from this we have 18 .97 ohms.
00:32
From this we can also calculate beta plus 1 multiplied with re which is equal to 1 .916 kilo ohms.
00:40
Now this is the re transistor model and this is the re transistor model for the circuit.
00:48
Now from these both models we can see r1 and r2 are parallel to each other.
00:57
So the equivalent resistance here would be 59 multiplied with 10 divided by 59 plus 10 which is equal to 8 .55 kilo ohms.
01:08
Now r1 r2 are parallel to each other.
01:13
The equivalent resistance from this and beta plus 1 multiplied with re will be parallel to each other.
01:19
So now the further equivalent resistance would be 8 .55 multiplied with 1 .916 divided by 8 .55 plus 1 .916 which is equal to 1 .565 kilo ohms...