How to use curve fitting to get transfer function in frequency domain?

2013 10 25
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更新时间：2013 10 30
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Hi all,
I have the data of sweep frequency scan of my circuit, both magnitude and phase. I am trying to use matlab curve fitting to obtain a transfer function from it. Can someone give help on this? Since I don't see curve fitting tool can import both magnitude and phase data in one fitting.

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回答（2 个）

Zack Peters
Zack Peters 2013-10-25

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Hi Siyu,
Rather than go through the Curve Fitting toolbox, I recommend one of two other avenues.
  1. Go directly to a linearized model (TF or SS representation) via Simulink Control Design toolbox. You can linearize model around a particular operating point or set of operating points.
  2. If you want to get a frequency sweep and then convert to transfer function. I would recommend get a frequency response estimate through our Simulink Control Design toolbox and then pass that data into the System Identification toolbox to get an estimated model of your system
~Zack

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Siyu He
Siyu He 2013-10-25
Hi Zack, Thanks for your reply.The data I have comes from my circuit,so I want to get estimated TF. I'll try control design tool box and let you know what I get.
He,siyu
Siyu He
Siyu He 2013-10-30
Hi, Zack. I was busy with my tests and did not have time to try simulink. which block should I use to convert my frequency response data to transfer function? Should I choose one from System Identification Toolbox not from Simulink Control Design?

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Siyu He
Siyu He 2013-10-30

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Hi, which block should I use to convert my frequency response data to transfer function? Should I choose one from System Identification Toolbox not from Simulink Control Design?

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Siyu He
2013-10-25

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2013-10-30

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