I tried to create a .tek file from IHP's pdk for A...
# ihp-sg13g2
d
I tried to create a .tek file from IHP's pdk for ASITIC using this code as a basis https://github.com/yrrapt/inductor-generator/blob/main/asitic/sky130.tek Sadly the simulations from ASITIC and openEMS seem to be VERY different (Q of >18 on ASITIC and Q=~4 in openEMS @ 2.4GHz). I think the main difference is in the Rseries result but I can't seem to pinpoint the cause. @Krzysztof Herman
a
Hi, did you figure out what was the problem? maybe check the dimensions again for sheet resistance. for e.g. about M1, I calculated 0.11ohm/sq, but the .tek file is 110. you can use this for converting conductivity to sheet resistance. https://www.suragus.com/en/technology/sheet-resistance-calculator/
k
@Daniel Barrios unfortunately I can not support you because I do not know ASITIC and nobody who could help. Maybe try to ask the developers.
d
@Ali Olyanasab Not yet, I was guessing the tek file used mOhm/sq as it appeared in the github. Also that would've meant the series resistance is even lower on ASITIC, resulting in an even higher Q, which is not the case.
v
@Daniel Barrios In your ASITIC tek file, there is a mistake with the substrate losses. The value must be given in Ohm*cm, so it would be
<layer> 0 ;Substrate rho =50 ; ohm-cm t = 280 ; microns eps = 11.9 <layer> 1 ;EPI rho =20 ; ohm-cm t = 3.75 ; microns eps = 11.9
Also, both substrate and EPI are conductive, so in the header you need to specify eddy losses for both of them: eddy =0; Layer 0 defined below is conductive eddy =1; Layer 1 defined below is conductive
Your understanding of conductor loss definition is correct, that is sheet resistance in milli-ohms/square