Strange Bode plot - phase and magnitude are not correlated

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tzg6sa

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Strange Bode plot

I have got a strange Bode plot what I do not understand. (I have the feeling that the phase and magnitude are not correlated.)
Have you any idea what can cause such a Bode plot?
 

Re: Strange Bode plot

If the transfer function contains allpass elements and/or delay units there will be no correlation between gain and phase response.
 

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