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From: Stefan Jahn <stefan@gr...>  20050822 07:17:27

On So, 21.08.2005, 10:30, Marcin Kaluza wrote: > Stefan, Hi! > hopefully, I was able to get rid of all mutual inductances in my netlists. > In the very particular case of the RLC networks I'm simulating, I was able > to erase them, adding their values or substracting from the inductances. > So > I'm can use qucs. > My goal is to calculate the 2x2 impedance matrix of my RLC networks, > calcualted for a single frequemcy point.. > I could do it the standard way, using the currents/voltages at the > entry/exit ports and having to change the elements connected to those > ports > to calculate the different elements of the impedance matrix which means in > fact running more than one simulation, to get the entire matrix. >>From my actual understanding of qucs, I could also use the S parameters > simulation and transform the resulting S parameters to Y parameters. ... to Zparameters I think? > What I would like to achieve is to get from qucsator.exe as output only > and > only my 2x2 impedance matrix. I belive it is possible, but would it be > easy? > If I would like to modify the code for my purposes, where should I look > for? You can use the spice component, select the (2) ports you need and then place Sparameter ports at these ports, then select the frequency in the Sparameter simulation box. Also you need to place a ground at the reference port of the spice component. The add a equation to the schematic and add: Z=stoz(S) The simulation results will contain the Zparameters then. Hope this helps, Stefan. 
From: Stefan Jahn <stefan@gr...>  20050822 07:11:16

On Fr, 8.07.2005, 21:33, John Steenbergen wrote: > Stefan, Hello John! > I tried to use the equations: > K = Rollet(S) > Gmax = abs(S[2,1]/S[1,2])*(Ksqrt((K^2)1)) > > Also reference eq. 1.146 in the technical documents. > > To calculate the max gain circles, but the result was way off the smith > chart. > > Any ideas? I am sorry that I did not respond for such a long time. But now I had again a look at my mailinbox... I assume the mails were about your 'NE85634107.S2P' file. If you look at the Rollet (K) factor you see that it is uncondiionally stable at about 1GHZ (K > 1 and det(S) < 1). That is why the the gain circles are off the smith chart. They are inside the smith chart if the twoport is unconditionally stable and the given gain is less or equal than the maximum gain. If you compute the maximum gain at a stable point and then compute the gain circle the radius is near zero. So GaCircle (S) with no gain given, looking for the maximum gain and computing the gain circle makes no sense, because it computes a point, not a circle. Now I wonder what all this is about? Please send an example what you have done, where the problem is and what you wanted to simulate and what you expect to see. >> According to my notes the max gain is: >> >> Gmax = mag or abs (S21/S12) * (K  (K^21)^(1/2) >> >> Where K is the stability factor. >> >> Hope that is a help. >> >> John >> >> >> On 7/8/05, Stefan Jahn <stefan@...> wrote: >> > >> > On Fr, 8.07.2005, 08:09, Michael.Margraf@... sagte: >> > >> > > Hello, >> > >> > Hi! >> > >> > >>> The last program (SuperStar) I used plotted the maximum gain at >> the >> > >>> calculated frequency so that was never a parameter. That clears a >> > lot >> > >>> up. >> > >> >> > >> Hm, that may be an option... Possibly we can do that as well. >> > >> Michael: What do you think about it? >> > > >> > > The gain needs to be a parameter! Not only the maximum gain is >> > > important. But perhaps the maximum gain can be the default >> > > value if none is specified ? >> > >> > That's what I meant. Using the maximum availale gain if no specific >> gain >> > >> > is given. Cheers, Stefan. 