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[SOLVED] How to plot the Q of a filter from the S-parameter simulation with Spectre

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wht4665453123

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Dear all,

I have run an S-parameter simulation with Spectre in Cadence and got the S21 of a filter. Can anybody tell me how to plot the Q, which is defined as 3.14*freq*d(phase(S(2,1)))/d(freq)
BTW, the differential term in that definition is also called Group Delay.

My friend told me to export the data into MATLAB and plot the Q. I wonder whether there's a easier way to do it?

I suppose I should use the Calculator tool in Cadence, but I'm not familiar with it.

Thank you very much.
 

In Cadence Design Environment, "freq" variable being as in ADS is NOT defined, therefore it's almost impossible to draw a curve vs. freq.
But I don't know the recent versions, it could be refined ...
The easiest way to draw this, import s-parameters in MatLab and then define the equation and draw it..
Or, use RFDE ( ADS working in ADE ) and plot this curve as in ADS...
 
BigBoss said:
In Cadence Design Environment, "freq" variable being as in ADS is NOT defined,
Click to expand...
Correct.

BigBoss said:
therefore it's almost impossible to draw a curve vs. freq.
But I don't know the recent versions, it could be refined ...
Click to expand...
Wrong.
In Cadence Spectre, "freq" is avaliable as xval(s(2,1)).

See https://www.edaboard.com/threads/208177/

wht4665453123 said:
Can anybody tell me how to plot the Q, which is defined as 3.14*freq*d(phase(S(2,1)))/d(freq)
Click to expand...
Q=( 2*acos(-1)*xval(s(2,1)) )/2 * abs( groupDelay(s(2,1)) )
 
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