38.1.3. Common Emitter Amplifier with Self-Bias

Try these first

1. 1.

   What is the purpose of self-biasing in amplifiers?

   Hint

   Think of temperature changes or component replacements.

2. 2.

   Define transconductance (gm).

   Hint

   It’s a key parameter in determining gain.

3. 3.

   What is the main advantage of using self-biasing in a CE amplifier?

   • A: Increased gain
   • B: Improved stability
   • C: Reduced size

   Hint

   Think about what changes would affect stability.

4. 4.

   True or False: The voltage gain of a self-biased CE amplifier is always positive.

   • True
   • False

   Hint

   Recall the nature of CE amplifier output.

5. 5.

   Given a self-bias CE amplifier with R1 = 20kΩ, R2 = 50kΩ, and C1 = 1µF, calculate the lower cutoff frequency.

   Hint

   Use the formula for the low-pass filter cutoff frequency.

6. 6.

   Design a self-biasing CE amplifier with a mid-frequency gain of -10. What values for gm and Rc would you select?

   Hint

   Ensure resistor values match your desired performance specifications.