ADS - Placing components onto layout

Hi folks!

For some days now I've been fiddling about with ADS and I must say I've been enjoying it immensely. Yesterday, I thought I would graduate from playing around in the schematic view and do some Momentum simulations with some real PCB-traces.

I imported a test-circuit (DXF) into the layout-view of ADS from Eagle - with the centrepiece being a TI TRF37C73 50ohm cascadable gain block - a chip I which already have the S-parameters for - together with an inductor, some 0402 decoupling-caps and a few 0402 resistors.

Not very pretty.

I am, however, very much at a loss when it comes to actually placing the resistors, capacitors and, more importantly, the gainblock S-parameter box, onto the layout itself. What's the best way to go about this?

In a very feeble attempt (and perhaps aggravatingly wrong, picture below) to do this I added a port to every component pad in the layout-view and exported the whole circuit as a schematic symbol (w/ EM-model) to the schematic-view, placed all the components on that and then ran the S-parameter simulation. This was sadly a no-go and only resulted in a torrential flood of error-messages - the main errors being (paraphrasing so they make sense): "The symbol is an instance of an undefined model" and "There are 18 pins inside the symbol and only 0 in the schematic".

Any help would be much appreciated.

Hi Annor,

the workflow sounds fine to me, and the only missing details might be the emModel. That is the "container" holding the data from your Momentum simulation.

Have a look at my example here, chapter "EM workflow basics: emSetup, emModel and symbol view":
http://muehlhaus.com/support/ads-app...eters-momentum

There you will also see how to change the simulation view from "schematic" to "emModel".

Good luck!
Volker

Thanks for the help! It finally worked just the way it was supposed to.

Read all your application notes in one stroke – fantastic resource for ADS beginners!

Annor

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