The AC load line
In previous lessons we used the dc load line to analyze biasing circuits. But an amplifier sees two loads, a dc load and a ac load. Now we will use the ac load line to understand the large signal operations.
DC values: VB = 1.8V, VE = 1.1V, IE = 1.1 mA, VC = 6.04V VCC = 10V, VCE = 4.94V
Without load: DC an ac load line are the same.
With load: rc = RC//RL
AC Load Line Construction
The following process shows you an easy method to get the ac load line:
1. Draw the dc load line
2. Calculate and draw the Q point
3. Draw a -temporary ac load line
VCE (cut) = VCC
4. Construct the ac load line
- parallel to the temporary ac load line
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