In this practice, the effects of changing the value of R2 will be examined. The practice includes 2 parts:
a) increase the value of R2.
b) decrease the value of R2.
Following is the procedure for the practice, as well as analysis
of the effects of changing the value of R2.
a)
Increase the value of R2
Procedure:
1.
Click “Continue” to start the simulation
2.
After a while (e.g. when the curves are reaching the 5th
grid), pull up the scaler in the scrollbar next to “R2” to increase
the value of R2.
3. Observe how each of the 5 curves (except the curve for ui) changes.
Analysis:
R2: increase =>
UB
= Ucc*R2/(R1+R2): increase
URE
= UB - 0.7: increase
UC
= Ucc - IC*RC: decrease
[because
IC = IRE = URE/RE: increase]
uo
= -40*IC0*RC*ui1: increase
[because
IC = IRE = URE/RE: decrease]
Uout
= UC + uo: decrease
[because
although uo increases at the same time UC decreases, the decreased amount of UC
is much larger than the increased amount of uo]
b)
Decrease the value of R2
Procedure:
1.
Click “Continue” to start the simulation
2.
After a while (e.g. when the curves are reaching the 5th
grid), pull down the scaler in the scrollbar next to “R2” to decrease the value of R2.
3.
Observe how each of the 5 curves (except the curve for ui) changes.
Analysis:
R2: decrease =>
UB:
decrease
URE:
decrease
UC:
increase
uo:
decrease
Uout:
increase