Question

BJT analysis

Why there is difference between calculated Q point and experimental Q point?

Answer 1

Actually the mathematical formulas which are used to calculate the Q point of BJT are derived at Ideal conditions.

But when we come to practical lot of circumstances like voltage fluctuations which is given to the Collector terminal of BJT , Temperature at where we operated these type of parameters are effected on the value.

Example is when temperature changes it will directly impact on the threshold voltage of BJT.

So the value are approximately same in theoretical value to practical value. But chance of getting same is vwry less.

I think this answer might helpful for you.

Thankyou.