35.4.2. Transformation of Transfer Function to Frequency Domain

Try these first

1. 1.

   What happens to the output of a circuit at very low frequencies?

   Hint

   Think about how capacitors behave at low frequencies.

2. 2.

   What does a Bode plot display?

   Hint

   Consider what graphs are used in signal processing.

3. 3.

   What transformation is used to change from Laplace domain to frequency domain?

   • Replace 's' with 'jω'
   • Replace 's' with 'ω'
   • No transformation needed

   Hint

   Think about the definitions we discussed regarding frequency.

4. 4.

   True or False: The phase shift at cut-off frequency is always 90°.

   • True
   • False

   Hint

   Consider what you know about phase shifts at various frequencies.

5. 5.

   Given an RC circuit with R = 1kΩ and C = 1µF, calculate the cut-off frequency.

   Hint

   Use the formula you’ve learned about cut-off frequency.

6. 6.

   Explain how the frequency response of a common emitter amplifier with feedback differs from one without feedback.

   Hint

   Consider the roles of feedback in amplifier design.