How to determine type of Filter from pole zero plot?

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SUMMARY

The discussion centers on determining the type of filter from a pole-zero plot, specifically identifying it as a High Pass Filter based on the transfer function G(s) = (s² + 2ζωn + ωn²) / ((s + p1)(s + p2)). The analysis concludes that the natural frequency ωn is less than both poles p1 and p2, leading to an amplified magnitude at higher frequencies in the Bode plot. The proximity of the zeros and poles complicates the analysis, but the consensus supports the conclusion of a High Pass Filter.

PREREQUISITES
  • Understanding of transfer functions in control systems
  • Familiarity with pole-zero plots and their significance
  • Knowledge of Bode plots and frequency response analysis
  • Basic concepts of filter types, specifically High Pass Filters
NEXT STEPS
  • Study the characteristics of High Pass Filters in signal processing
  • Learn about the implications of pole-zero configurations on filter behavior
  • Explore Bode plot analysis techniques for different filter types
  • Investigate the role of damping ratio (ζ) in filter performance
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Electrical engineers, control system designers, and students studying signal processing who are interested in filter design and analysis.

rudra
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Imp.jpg

According to me Transfer function will be G(s)= (s2+2ζωnn2)/((s+p1)(s+p2))

I assume from the given plot that ωn < p1 and ωn < p2

Then the bode plot will be as per me like following :
Imp.jpg
From the Bode plot we can see for higher freq magnitude is amplified . So it will be High pass Filter.

That's my analysis. If I am wrong please correct me.
 
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The imaginary part of the zeros and the real part of the two poles are pretty close together in frequency, which makes it difficult to tell whether the zeros' 40 dB/decade rise occurs before or after the pole drops, but the second pole break definitely occurs at a higher frequency than either the other pole's or that of the zeros so I'd say your conclusion is as correct as anyone's.
 
Thank you rude man. I needed someone to support my answer.
 

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