42.2.1. Generalized Equivalent Circuit Parameters

Try these first

1. 1.

   What does input resistance represent in an amplifier circuit?

   Hint

   Think about how signals interact when they first enter the circuit.

2. 2.

   Define the Miller effect.

   Hint

   Consider how feedback mechanisms affect input characteristics.

3. 3.

   What is the input resistance of an amplifier?

   • The load resistance
   • Resistance seen at the input
   • Resistance seen at the output

   Hint

   Think about the point where signals are first connected into the circuit.

4. 4.

   True or False: Voltage gain is always negative in a common emitter amplifier.

   • True
   • False

   Hint

   Consider the amplifier's behavior with respect to input and output signals.

5. 5.

   Design a CE amplifier with R_in of 2 kΩ and R_out of 4 kΩ. Determine mid-frequency gain given a load capacitance of 200 pF.

   Hint

   Use the relationships taught in class for gain computation.

6. 6.

   You're tasked to redesign a common source amplifier aiming to improve upper cutoff frequency. What component changes would you consider?

   Hint

   Recall the influence of capacitance and resistive loads on frequency response.