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SProbe

Question asked by MCROMNEY on Sep 16, 2003
Latest reply on Dec 10, 2003 by nilesh1

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I'm trying to measure stability and reflection coef. for a three stage PA by looking in between each stage. I've used the SProbe file before for small signal amps but for the PA, I need data under large signal conditions. If I understand the SProbe properly, it computes data under small signal conditions only. I've also used ideal couplers inserted between stages but I'm leery of the results. Can anyone help me with this?

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wrivas Sep 26, 2003 1:45 AM
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I have a feeling that when the SProbe was created wot much thought was given to large signal analysis.

You could try a LSSP (Large Signal S-Parameter) simulation but not having tried it myself it may be necessary to modify the SProbe to work properly. What also clouds the situation is that there are two version of the SProbe so it will also depend on what "version" you are using.

Please contact EEsof Technical Support in case you still are having problems and/or concerns.
http://eesof.tm.agilent.com/support/supp101.html
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mfredrik Sep 26, 2003 5:43 AM
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This example contains some examples on how to get S-parameters from HB simulations - using ideal couplers. It may be of help..

http://edasupportweb.soco.agilent.com/cgi-bin/show.pl?id=141198
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ddshark Dec 9, 2003 7:47 AM
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The attached project shows the approach that I like, that uses a WaveProbe. It's inserted just like a current probe and has a single parameter Z0 to define the characteristic wave impedance. It then computes and stores to the dataset the forward wave, the reverse wave, and the power delivered (in dBm). In the dataset presentations, you can then define whatever ratio of these you would like: to show reflection/impedance at intermediate points, gain to intermediate points, delivered power, distortion, etc. It should work for all analyses except for noise, unfortunately. For that, you probably still need the coupler or some other approach. If you add a ParamSweep to switch the source from the input to the output, you could then compute and display forward and reverse parameters.

Whoops. I didn't realize attach in this forum. See the WaveProbe thread in ADS2003A Web Forum under the Technical Support Forum.
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nilesh1 Dec 10, 2003 8:28 AM
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The WaveProbe example that ddshark mentioned can be downloaded from here.
WaveProbe Example

8) nilesh
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