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Thread: Turning off certain port combination in S-Parameter simulation


Permlink Replies: 1 - Pages: 1 - Last Post: Aug 31, 2012 4:53 PM Last Post By: sdgrant Threads: [ Previous | Next ]
nafipejh

Posts: 1
Registered: 08/31/12
Turning off certain port combination in S-Parameter simulation
Posted: Aug 31, 2012 8:27 AM
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Hello,

I often import .snp files using data items (like ads_datacmps:S2P) with porst connected to its terminals, and then make the data from the file available by running an S-Parameter simulation.

When I have more than one file import in my schematics some of the S-Parameters I get as a result of simulation are useless. For instance, if I want to import two s2p-files I will use two S2P components from ADS and then connect Port impeadances Term1 and Term2 to the first S2P and Term3&Term4 to the second S2P.

Since I have four Terms in my schematic I will get the total of 16 S-Parameters, eight of which are useless - for instance S31 presents no information to me in this setup.
If I want to plot the data I need to browse through many S-Parameters containing no data. Is there any way of switching off the unnecessary SParameters or maybe an import method allowing avoiding the generating of unnecessary S-parameters ?

Thank you in advance.
sdgrant


Posts: 110
Registered: 06/08/09
Re: Turning off certain port combination in S-Parameter simulation
Posted: Aug 31, 2012 4:53 PM   in response to: nafipejh in response to: nafipejh
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S-parameter matrixes are square so to calculate S11, S12, S21 and S22 then you will always get S13, S14, S23 and S24 for a 4 port network. Similar for ports 3 and 4. There is no way to disable those 'unwanted' values.

If the goal is to simply read 2 port s-parameter data from a Touchstone S2P file into a dataset so that it can be used for graphs in the Data Display why are you using simulation? You can simply use the Tools > Data File Tool... from the either the Schematic or Data Display menus to read each S2P file data into a dataset directly. You can then access the dataset to draw any graphs required without the unwanted data being generated.

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