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DC Bias point of Spice model in EM Extract (AWR MWO)

mjgaa

Dear all, 

I have a simulation of an amplifier circuit (PCB) that consists of some lumped parameters and a nonlinear device. 

As soon as the EM Extract block is enabled the DC bias (DCVS block) voltage does not apply any current and thus the transistor model (SPICE) does not work. 

How can I fix this problem? (For now I include DC into my simulation) 

Second problem but not as important as the first one is that as soon as I hit run the EM Model gets overwritten and therefore I cannot change things before simulation. 

What I want is to set the ports to connect to lower and draw a GND plane beneath the circuit because I have 4L substrate.

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  • Hi Mjgaa,

    I sent you a request on the forums to send me the project you are using so I can take a look.

    For the first issue you are running into, the first place I would look at is the extracted layout to make sure that the extraction did not break the connectivity.

    As for the second issue, the port type can be changed by going to the settings in the extraction block and looking at the secondary settings.

    To draw a GND plane, simply draw it in the 2D layout of the schematic you want to extract, and then enable both the extraction setting and the Group Name in the shape properties.



    You can find more information on Extraction in Chapter 11 of the Simulation guide.

    Thanks,

    David Webster

Reply

  • Hi Mjgaa,

    I sent you a request on the forums to send me the project you are using so I can take a look.

    For the first issue you are running into, the first place I would look at is the extracted layout to make sure that the extraction did not break the connectivity.

    As for the second issue, the port type can be changed by going to the settings in the extraction block and looking at the secondary settings.

    To draw a GND plane, simply draw it in the 2D layout of the schematic you want to extract, and then enable both the extraction setting and the Group Name in the shape properties.



    You can find more information on Extraction in Chapter 11 of the Simulation guide.

    Thanks,

    David Webster

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