29.4.1. Numerical Example

Try these first

1. 1.

   What is the base current if the collector current is 2 mA and β = 100?

   Hint

   Use the formula for converting Ic to Ib.

2. 2.

   If the input signal is 1 mV and the voltage gain is -200, what will be the output voltage?

   Hint

   Multiply input voltage by the voltage gain.

3. 3.

   What is the value of the input resistance in a CE amplifier with rπ = 1.3 kΩ?

   • 1.3 kΩ
   • 10 kΩ
   • 3.3 kΩ

   Hint

   Consider the effect of dominating resistance on input characteristics.

4. 4.

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

   • True
   • False

   Hint

   Recall the basic properties of amplifier configurations.

5. 5.

   If the β of the transistor varies between 50 and 200, analyze how Ic and the overall gain are affected.

   Hint

   Explore the linear relationship of Ic to Ib and how it reflects in gain.

6. 6.

   Explain what happens to the output swing and power dissipation if the load resistance connected to the collector is decreased.

   Hint

   Consider the cascading effects on total dissipation and output limits.