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The unit circle of the Nyquist plot transforms into unity or 0 dB line of the amplitude plot of the Bode diagram for
  • a)
    low frequencies
  • b)
    high frequencies
  • c)
    all frequencies
  • d)
    specific bandwidth
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The unit circle of the Nyquist plot transforms into unity or 0 dB line...
The slope of magnitude plot of a Bode plot at any frequency is given by
Slope = (Z – P) × 20 dB/decade
Where, Z is the number of zeros at that frequency
P is the number of poles at that frequency
If a closed-loop pole of the system is on the jω axis, then the magnitude equals 1 and the phase is 180 degrees at that frequency. If that occurs, the Nyquist plot will pass through the -1 point at that frequency. It indicates that there are equal number of poles and zeros.
Therefore, the unit circle of the Nyquist plot transforms into 0 dB line of the amplitude plot of the Bode diagram at any frequency.
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The unit circle of the Nyquist plot transforms into unity or 0 dB line of the amplitude plot of the Bode diagram fora)low frequenciesb)high frequenciesc)all frequenciesd)specific bandwidthCorrect answer is option 'C'. Can you explain this answer?
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