66.6.4. Practical Gain Limitations

Try these first

1. 1.

   What is the primary limitation on voltage gain in a common emitter amplifier?

   Hint

   Think about how passive components interact with power supply limitations.

2. 2.

   How does replacing a passive load with an active load theoretically improve gain?

   Hint

   Consider the changes in current-voltage characteristics.

3. 3.

   What is the primary factor limiting voltage gain in common emitter amplifiers?

   • Output load resistance
   • Input signal voltage
   • Collector resistor voltage drop
   • Transistor type

   Hint

   Consider how the supply and output components interact.

4. 4.

   True or False: Common source amplifiers generally achieve higher voltage gains than common emitter amplifiers.

   • True
   • False

   Hint

   Reflect on the different transistor designs they utilize.

5. 5.

   Design a common emitter amplifier with a targeted voltage gain of 100. What component values would you choose considering practical limitations?

   Hint

   Ensure that the voltage at the output does not saturate for the intended input signal range.

6. 6.

   Examine a common source amplifier that has a maximum allowed Vdd of 10V and aims for a gain of 5. Calculate the ideals for resistor values when connected to a FET with specified transconductance.

   Hint

   Analyzing load line can give insight about achievable gain ranges.