Biasing

17 In this problem, you see the steps used to calculate the resistor values needed to bias the amplifier circuit shown in Figure 8.8.

Figure 8.8

8.8

You can determine values for R1, R2, and RE that bias the circuit to a specified DC output voltage and a specified AC voltage gain by using the following steps.

Read the following procedure and the relevant formulas first, and then you will work through an example.

1. Find RE by using the following:

equation

2. Find VE by using the following:

equation

3. Find VB by using the following:

equation

4. Find IC by using the following:

equation

5. Find IB by using the following:

equation

6. Find I2 where I2 is 10IB. (Refer to the circuit shown in Figure 8.6.) This is a convenient rule of thumb that is a crucial step in providing stability to the DC bias point.
7. Find R2 by using the following:
8. Find R1 by using the following:
9. Steps 7 and 8 might produce nonstandard ...

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