## [Qucs-help] Re: coefficient reflexion

 [Qucs-help] Re: coefficient reflexion From: Stefan Jahn - 2006-04-21 05:46:37 ```Am Do, 20.04.2006, 16:44, schrieb thierry scordilis: Hi! > In fact when you choose the compromise between noise circle and gain > circle, you point a impedance in the output plane => therefore it > implies a certain coefficient in the input plane,... it could be good > to see it directly in smith wihtout having to proceed to the complete > output matching to see it in the input plane. > > thierry. > > in the same manner it could be interresting to see the Gtu of a device > as a mathematical function: > > Gtu = I S21 I^2 . (1- I Rl I^2) . (1-I Rg I^2) / I 1-S22.Rl I^2 / I > 1-S11.Rg I^2 Right now this is not possible. You need to put everything in place and re-simulate and see what happens. I assume you adress a kind of "tuner tool" where you can shift resistor or any other property values to see simulation results changing interactively? Is this what you mean? Cheers, Stefan. ```

 [Qucs-help] Re: coefficient reflexion From: Stefan Jahn - 2006-04-21 05:46:37 ```Am Do, 20.04.2006, 16:44, schrieb thierry scordilis: Hi! > In fact when you choose the compromise between noise circle and gain > circle, you point a impedance in the output plane => therefore it > implies a certain coefficient in the input plane,... it could be good > to see it directly in smith wihtout having to proceed to the complete > output matching to see it in the input plane. > > thierry. > > in the same manner it could be interresting to see the Gtu of a device > as a mathematical function: > > Gtu = I S21 I^2 . (1- I Rl I^2) . (1-I Rg I^2) / I 1-S22.Rl I^2 / I > 1-S11.Rg I^2 Right now this is not possible. You need to put everything in place and re-simulate and see what happens. I assume you adress a kind of "tuner tool" where you can shift resistor or any other property values to see simulation results changing interactively? Is this what you mean? Cheers, Stefan. ```