AC Load line:
Consider the DC equivalent circuit figure1.
![1997_ac load line.png](https://www.expertsmind.com/../CMSImages/1997_ac load line.png)
Figure 1
Supposing IC = IC(approx), the output circuit voltage equation can be given as
![939_ac load line1.png](https://www.expertsmind.com/../CMSImages/939_ac load line1.png)
The slop of the DC load line is
.
When considering AC equivalent circuit, the output impedance becomes RC || RL which is less than (RC +RE).
In the absence of ac signal, this load line passes through Q point. Therefore ac load line is a line of slope (-1 / ( RC || RL) ) passing through Q point. Hence, the output voltage fluctuations will now be corresponding to AC load line as shown in the figure 2. Under this condition, Q-point is not in the middle of load line, thus Q-point is selected slightly upward, means shifted slightly to the saturation side.
![2343_ac load line4.png](https://www.expertsmind.com/CMSImages/2343_ac%20load%20line4.png)
Figure 2
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