30.3.3. Power Dissipation and Current Calculations

Try these first

1. 1.

   What is the formula for voltage gain in a common emitter amplifier?

   Hint

   Consider the relationship between transconductance and quiescent current.

2. 2.

   Define quiescent current.

   Hint

   Think about the steady-state condition of the circuit.

3. 3.

   What does the term 'gain' refer to in amplifiers?

   • Output to Input Voltage Ratio
   • Total Circuit Power
   • DC Current in Transistor

   Hint

   Think about what an amplifier does to a signal.

4. 4.

   True or False: The quiescent current has no effect on power dissipation in transistors.

   • True
   • False

   Hint

   Consider how DC current impacts heat generation.

5. 5.

   Design a common emitter amplifier for a 12V supply aiming for a voltage gain of 150. Detail your calculations for component values.

   Hint

   Start with maximum power dissipation and work backwards.

6. 6.

   Given a transistor with a β of 150 and I_C of 1.5 mA, calculate the required input voltage to maintain proper biasing with a voltage divider.

   Hint

   Remember to consider the base current in your calculations to maintain a stable operating point.