Amplifier Teaching Aid (GTZ, DED; 86 pages) Preface Introduction Lesson 1 - Semiconductor Review Lesson 2 - Bipolar Transistor Bipolar Transistor II First Evaluation Lesson 4 - Transistor Fundamentals Lesson 5 - Transistor Biasing Lesson 6 - Transistor Biasing II Second Evaluation Lesson 7 - Small Signal Amplifier Lesson 8 - Small Signal Amplifier II Lesson 9 - Small Signal Amplifier III Lesson Plan Other configurations Frequency response of an amplifier The AC load line Handout No. 2 Worksheet No. 9 Lesson 10 - Large Signal Amplifier Third Evaluation

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.

Fig. 9-2: CE amplifier

DC values: VB = 1.8V, VE = 1.1V, IE = 1.1 mA, VC = 6.04V VCC = 10V, VCE = 4.94V

The following process shows you an easy method to get the ac load line:

1. Draw the dc load line

VCE (cut) = VCC - VE = 8.9V

2. Calculate and draw the Q point

IC = 1.1 mA

VCE = 6.04V

3. Draw a -temporary ac load line

VCE (cut) = VCC

4. Construct the ac load line

- parallel to the temporary ac load line
- passing the Q point

Fig. 9-3: Construction of an ac load line