According to my text book,
When we use a transistor as an amplifier, there generally 2 resistors, one is input resister(R in) and the other is output resister(R out). Normally these resistors are connecting as R out is relatively greater than the R in.
- I can't understand the reason for Why the R out should greater than the R in and what is the expectation of that?
For a concerned IB at the start of the curve, it has a speedy variation (relatively high gradient) and after a while the variation is slow and becoming linear(less gradient).
- What is the reason for have two gradients? Starting have a speed variation and then slow gradient... I tried to concentrate it with the Ohm's law but couldn't.(According to the ohm's law the R out should different at the two situations.)
- I can't understand the reason of why there is a saturated region after the activated region. Why does the activated region can't to be continue.
I expect answers with theoretical descriptions and a deep view of the structure of the transistor.