36.2.1. Understanding Gain and Frequency Cutoff

Try these first

1. 1.

   Define frequency response.

   Hint

   Think about how circuits behave with different signals.

2. 2.

   What characterizes a cut-off frequency?

   Hint

   Consider what happens at the point of maximum gain.

3. 3.

   What is the cut-off frequency in an R-C circuit?

   • The frequency at which gain is 0 dB
   • The frequency where gain drops to -3 dB
   • No effect on gain

   Hint

   Remember the typical definition of cut-off frequencies in filters.

4. 4.

   True or False: The phase shift in an R-C circuit decreases from 0° to -90° as frequency increases.

   • True
   • False

   Hint

   Consider how voltage phases translate across frequencies.

5. 5.

   Design an R-C low-pass filter with a cut-off frequency of 1 kHz. Choose appropriate values for R and C.

   Hint

   Ensure you select standard component values that are easily available.

6. 6.

   Analyze the phase shift of an R-C circuit at three distinct frequencies: lower than the cut-off, at the cut-off, and higher than the cut-off.

   Hint

   Sketch the phase response to visualize clearly how shifts occur.