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How to use the function--diff in ADS to caculate group delay

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ads group delay

Hi all,
I am a new comer.How to use the function--diff in ADS to caculate group delay?
Tnank you,
 

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group delay in ads

gd = -diff(unwrap(phaserad(S(1,1)),pi) )/ (2*pi)
 
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group delay ads

If you are using the sparameter engine you can select the group delay in one of the tabs of the sparameter engine componenet...
 

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