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Equation Syntax

Maria98

Hi

I want to find out the Quality Factor, Inductance, and resistance of the designed inductor layout through its s2p file.

The basic equation to calculate the above values is:

zdiff=Z(1,1)-Z(1,2)-Z(2,1)+Z(2,2)

i wrote in ADE L calculator as:

(db(zpm('sp 1 1)))-(db(zpm('sp 1 2)))-(db(zpm('sp 2 1)))+(db(zpm('sp 2 2)))

with name zdiff.

but its waveform is not appearing. 

Please guide

Thank you

  • I'm not sure why you would want to add/subtract the z-parameters in dB - that seems wrong to me. I'd have expected you really wanted to do:

    zpm('sp 1 1 )-zpm('sp 1 2 )-zpm('sp 2 1 )+zpm('sp 2 2 )

    However, if you really did want to add the values in dB, then you have too many parentheses. SKILL (and hence the ADE calculator) is fussy about having too many parentheses - it confuses the parser. You had an additional set around every db() call, so if you use this:

    db(zpm('sp 1 1))-db(zpm('sp 1 2))-db(zpm('sp 2 1))+db(zpm('sp 2 2))

    it should work correctly (whether the results are what you want or not is another matter).

    Andrew

  • in reply to Andrew Beckett

    Thanks a lot, i was doing mistake by adding dB values. 

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