27.2.2. Parameters of Voltage Amplifier

Try these first

1. 1.

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

   Hint

   Look for the formula relating gain to the resistors.

2. 2.

   Define input resistance in the context of amplifiers.

   Hint

   Remember how the amplifier behaves towards the incoming signal.

3. 3.

   What happens to voltage gain if emitter resistance is increased?

   • Gain increases
   • Gain decreases
   • No change

   Hint

   Remember the feedback effect introduced by RE.

4. 4.

   True or False: The output resistance of a common emitter amplifier is always equal to RC.

   • True
   • False

   Hint

   Consider what else influences Ro.

5. 5.

   You're designing a common emitter amplifier. If you decide on a gain of -15, how would you choose RE relative to RC, and what are the implications?

   Hint

   Use the voltage gain formula and consider all resistances involved.

6. 6.

   If you have a specific β value and need a target input resistance of 1kΩ, how would you determine the correct RE?

   Hint

   Rearrange the input resistance formula effectively.