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Need plugins of Ansoft HFSS to compute Q of spiral inductor

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mike_bihan

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: Need plugins of Ansoft HFSS to compute Q of spiral inductor, can any people offer hand?
 

BigBoss

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really neccesary ?

Compute S-parameters and convert Touchstone format. Put them in a black box in a linear simulator and make a s-parameters simulation with second port short circuited. After this simulation , find Z-prameter and calculate real and imaginary part of the black box from S11 ( or they are automatically calculated ) and then ..

imag( Z11 )
Inducance = ----------------
2.pi.freq

imag ( Z11)
Q =---------------
real ( Z11)

I think it's clear ? Because I use this method within ADS and works well..

Good Luck
 

STD

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BigBoss said:
really neccesary ?

Compute S-parameters and convert Touchstone format. Put them in a black box in a linear simulator and make a s-parameters simulation with second port short circuited.


Why second port should be short circuited to get Z pars?
 

flyhigh

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Re: Need plugins of Ansoft HFSS to compute Q of spiral induc

Hi,

I think I can answer that question. The second port sould be short circuited to avoid loading of your inductor with 50Ohm impedance of the port. This 50Ohm will be included in your Q otherwise. Hope this helps

flyhigh
 

STD

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flyhigh,
This Q factor is named unloaded Q(Qu)?Thanks.

STD
 

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