42.2.6. Upper and Lower Cutoff Frequencies in Common Source Amplifier

Try these first

1. 1.

   Define cutoff frequency in your own words.

   Hint

   Think about where amp signals start losing strength.

2. 2.

   What is the purpose of Miller's Theorem?

   Hint

   What can you use to make complex circuits easier to analyze?

3. 3.

   What is the formula for calculating the lower cutoff frequency?

   • A) fL = 1/(2π × R × C)
   • B) fU = 1/(2π × R_par × C)
   • C) Av = Vo/Vi

   Hint

   Think about how frequency interacts with resistance and capacitance.

4. 4.

   True or False: The upper cutoff frequency is influenced by the input capacitance.

   • True
   • False

   Hint

   Consider which components play roles at higher frequencies.

5. 5.

   A common source amplifier has a lower cutoff frequency of 10 Hz and an upper cutoff frequency of 450 kHz. Given a load capacitance of 10 pF, what would happen to the upper cutoff frequency if this capacitance is increased to 100 pF?

   Hint

   Consider how higher capacitance affects the circuit's impedance.

6. 6.

   Discuss how design choices in component values impact the overall frequency response of an amplifier.

   Hint

   Think about what happens when you change resistances and capacitances in the context of frequency.