Hello,
Very basic question on ADS 2102.08. Want to make sure that I am doing it correct.
1. Created layout (Cell1) with a copper trace and ports. In the EM set up window, set the start frequency as 1.8GHz and Stop freq as 1.9 GHz. Clicked on "Create now" for emmodel and symbol. Is ADS doing the EM simulation and computing the S parameters at this point (When clicked the "Create Now" for EM Model)?. Or what is there in this Em model. Does it have the EM simulation results?
2. Created a schematic view and dragged the symbol (From Cell1). Set up the S parameter simulation with Start Freq as 1.8GHz and Stop as 1.9 GHz. Ran the simulation. The "Let the Hierarchy Policy determine" was selected in "Choose View For Simulation". ADS quickly did the simulation. But, I think the EM simulation is not used at this point, right.
3. Selected the "Use this for simulation " and selected my "EM Model" and ran the simulation from Schematic view. Looks like ADS is doing the EM simulation now. The results are different from step 2. But, I don't see any meshing of the copper in my Layout ?.
4. Suppose I change my schematic window S parameter Start to 1.6GHz and Stop as 2Ghz (In the EM set up it is 1.8 Ghz and 1.9 GHz, respectively) . When simulation is run from the schematic view with EM modele selected as view for simulation, will it run the EM simulation again with the new frequency set in the schematic view?
5. Suppose I make some changes in the copper in cell 1 layout view and save. How to make sure that this change in reflected in the schematic view and in my simulation results?
6. Suppose I add another port in the layout view on the copper. How to make sure that it is reflected in the schematic view?
7. In the EM set up window, there is an option for "Mode/symbol". Then there is another one under "EM","Component","Create Model/Symbol". Are they same?
Very basic question on ADS 2102.08. Want to make sure that I am doing it correct.
1. Created layout (Cell1) with a copper trace and ports. In the EM set up window, set the start frequency as 1.8GHz and Stop freq as 1.9 GHz. Clicked on "Create now" for emmodel and symbol. Is ADS doing the EM simulation and computing the S parameters at this point (When clicked the "Create Now" for EM Model)?. Or what is there in this Em model. Does it have the EM simulation results?
2. Created a schematic view and dragged the symbol (From Cell1). Set up the S parameter simulation with Start Freq as 1.8GHz and Stop as 1.9 GHz. Ran the simulation. The "Let the Hierarchy Policy determine" was selected in "Choose View For Simulation". ADS quickly did the simulation. But, I think the EM simulation is not used at this point, right.
3. Selected the "Use this for simulation " and selected my "EM Model" and ran the simulation from Schematic view. Looks like ADS is doing the EM simulation now. The results are different from step 2. But, I don't see any meshing of the copper in my Layout ?.
4. Suppose I change my schematic window S parameter Start to 1.6GHz and Stop as 2Ghz (In the EM set up it is 1.8 Ghz and 1.9 GHz, respectively) . When simulation is run from the schematic view with EM modele selected as view for simulation, will it run the EM simulation again with the new frequency set in the schematic view?
5. Suppose I make some changes in the copper in cell 1 layout view and save. How to make sure that this change in reflected in the schematic view and in my simulation results?
6. Suppose I add another port in the layout view on the copper. How to make sure that it is reflected in the schematic view?
7. In the EM set up window, there is an option for "Mode/symbol". Then there is another one under "EM","Component","Create Model/Symbol". Are they same?
> {quote:title=Leyo wrote:}{quote}
> 1. Created layout (Cell1) with a copper trace and ports. In the EM set up window, set the start frequency as 1.8GHz and Stop freq as 1.9 GHz. Clicked on "Create now" for emmodel and symbol. Is ADS doing the EM simulation and computing the S parameters at this point (When clicked the "Create Now" for EM Model)?. Or what is there in this Em model. Does it have the EM simulation results?
The emModel will manage your EM results, for the EM simulations that you run on this layout. If the layout cell has parameters, the emModel will also manage the different results, and possible interpolation between these EM results.
You can create the emModel before or after running the EM simulation. If you create it manually before running the EM simulation, it will start the EM simulation automatically when the schematic needs data.
> 2. Created a schematic view and dragged the symbol (From Cell1). Set up the S parameter simulation with Start Freq as 1.8GHz and Stop as 1.9 GHz. Ran the simulation. The "Let the Hierarchy Policy determine" was selected in "Choose View For Simulation". ADS quickly did the simulation. But, I think the EM simulation is not used at this point, right.
Correct.
> 3. Selected the "Use this for simulation " and selected my "EM Model" and ran the simulation from Schematic view. Looks like ADS is doing the EM simulation now. The results are different from step 2. But, I don't see any meshing of the copper in my Layout ?.
Correct. This has started the EM simulation. You don't see the mesh if you run the EM simulation from the emModel. If you want to see the mesh, you can generate it from the emSetup (bottom right: change the dropdown list from "S-Parameters" to "Mesh" and click "Go")
> 4. Suppose I change my schematic window S parameter Start to 1.6GHz and Stop as 2Ghz (In the EM set up it is 1.8 Ghz and 1.9 GHz, respectively) . When simulation is run from the schematic view with EM modele selected as view for simulation, will it run the EM simulation again with the new frequency set in the schematic view?
No! It will keep using the frequencies that are configured in the emModel, no matter what you have configured in the schematic! You will see a warning about data extrapolation, but otherwise there is no automatic behaviour to adjust the emModel/emSetup frequencies. Agilent support say this is on purpose, because you might want to EM your layout up to the n-th harmonic in nonlinear simulations, and the user should better set all this manually. I don't fully agree on that, but it is what it is ...
One comment on emModel and emSetup here: the emModel is created from the emSetup settings, and creates a "snapshot" of these settings. So after you have created the emModel, it has its own independent settings until it is updated from the emSetup. It is only updated from the emSetup if you update it manually, or after an EM simulation from the emSetup dialog with the automatic emModel update enabled.
> 5. Suppose I make some changes in the copper in cell 1 layout view and save. How to make sure that this change in reflected in the schematic view and in my simulation results?
You need to be careful here! ADS does not recognize your layout changes, if you *manually edit the layout*. You need to manually start EM simulation from the emSetup, and enable automatic update of the emModel. This will overwrite previous results. Or alternatively, you can manually updated emModel and symbol with the menu item from your question (7).
If the layout is a parameterized cell, and the layout changes automatically because the cell parameters change, then the emModell *will* recognize this and add another set up results for this parameter combination.
> 6. Suppose I add another port in the layout view on the copper. How to make sure that it is reflected in the schematic view?
Open the emSetup dialog. On the Model/Symbol page, enable the automatic update of symbol and emModel, and start the EM simulation. Or alternatively, you can manually updated emModel and symbol with the menu item from your question (7).
>
> 7. In the EM set up window, there is an option for "Mode/symbol". Then there is another one under "EM","Component","Create Model/Symbol". Are they same?
Yes, that's the same.
Best regards
Volker