In the context and basis for the control technique, I can’t really imagine what a bode diagram just shows.
Is it true that on the x-axis this represents the frequency of the input signal and on the y-axis represents the gain, i.e. the amplitude from output to input?
And on another graph also shows the phase shift of output relative to input, with the frequency of the input signal again on the x-axis?
Answer
Dear Yuri,
The bode diagram is a property of a linear time invariant system, and not of a signal. So we plot the frequency response of a linear system on the bode diagram, which is the division of the spectrum of the output signal by the input signal.
Note that if you apply a sine of frequency f to the input of a linear time invariant system, this sine of the same frequency appears at the output. The frequency at the input and the output are therefore the same in this case.
Answered by
yves rolaine
high frequency electronics electromagnetism
Pleinlaan 2 1050 Ixelles
http://www.vub.ac.be/
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