68.1.15. Transition to Common Source Amplifier

Try these first

1. 1.

   What is the key advantage of using an active load?

   Hint

   Think about how resistance affects gain.

2. 2.

   Define 'Output Voltage'.

   Hint

   Recall the relationship between input and output.

3. 3.

   What is a key property of common source amplifiers?

   • Higher Voltage Gain
   • Lower Power Consumption
   • No Feedback

   Hint

   Consider the purpose of using active components.

4. 4.

   True or False: The output resistance in a common source amplifier is significantly lower than in a common emitter amplifier.

   • True
   • False

   Hint

   Think about the effect of loading on resistance.

5. 5.

   In a MOSFET CS amplifier, the supply voltage is 15V, V_GS = 1.5V, and the transconductance is 5 mS. Calculate the expected output voltage if the load resistor is 4 kΩ.

   Hint

   Break down the formula into parts—find the conductivity effect first!

6. 6.

   A circuit has two different transistors with β values of 150 and 200. How will you adjust the base currents to ensure they reach the same collector current?

   Hint

   Apply the relationships of current and beta for stability.