Hi,
I am trying to simulate a structure as below:
I have to attach an SMD diode between ports, P1 and P2. I have SPICE model for the diode and C2 and L2 model the package, whereas L3 is for DC path. Separtion between P1 and P2 is 45mils whereas the pad size is 80mil/40mil.
Now, If I define port P1 and P2 as TML, the EM cosimulated results are way too different than the schematic simulation results. However, if I define them as SMD ports, the results are good and only differs little from the Schematic simulation results.
I am not sure which results to believe. I watched a video from ADS channel and I think I should go with the SMD port calibration. Could you please comment on this.
Hello,
I think the problem of unmatched results is due to the distance between the two ports P1, P2 The typical distance should be less than lambda/10 (at the highest frequency). If the distance has not been fulfilled so the current injected has a phase shift and this cause delay through inductor and capacitor.
So try to use an area port and assign the port inside, you can check the ports assignment within ADS documentation Tutorails