[SI-LIST] AW: about s parameter
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 29 Mar 2012 08:14:38 +0000
Hello Wangshua,
I hope this is your name... you didn't state it anywhere.
First of all, please help us in helping you by simply asking questions that
make sense just the first time reading.
Some answers to what I think the question might have been:
1: Insertion loss for passive transmission systems is always below 0 and shows
an overall downward slope with rising frequency. Return loss of Passive
transmission systems rises with frequency beginning at very low magnitudes and
never reaching 0. If you see something else, then the simulation, measurement
or DUT has an error.
2: If you find passivity and causality errors, you can first check if you can
live with them. If not, there are several mechanisms to remove these effects,
but be aware that these techniques CHANGE your data (might be a small change,
but still). Most High performing Simulators automatically enforce pasivity and
causality.
3: If you need to transform the S-parameters into time domain (impulse
response, TDR, TDT, statistical channel simulation...) Then you need the DC
-Point. If you don't create one yourself, then the software will do it without
letting you know how (engineers should know what happens and why, so I
recommend to insert the DC point by hand).
BR
Gert
This mail may contain much more information than initially requested. Please
feel free to ignore as much as you can afford.
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von wangsuhua
Gesendet: Donnerstag, 29. März 2012 03:11
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] about s parameter
Dear all: I have three questions about s parameter 1.how insertion loss or
return loss curver is correct 2. if my s parameter have some causality or
passive error, how i do 3. use hfss extract via's model , sweep is 0~20ghz,
do i need extract to dc 1ghzthank you very much!
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