Hamid.Kiumarsi
Full Member level 2
Dear experts,
I am trying to simulate an inductor with Patterned Ground Shield (PGS). PGS is on the "poly" layer and inductor is on the top metal.
Since the ground is patterned, I can not use the infinite ///GND/// of Momentum.
One way is to define two single ports for the inductor on the top metal and then adding ground reference ports for each single port on poly layer.
For checking that ground refernce ports will work well, first I didn't use patterned ground and just used a solid sheet of poly under inductor and defined ground reference ports on it. Then I also simulated this inductor when poly layer was removed and instead of it, infinite ///GND/// of Momentum with the conductivity value same as poly was used. Surprisingly simulation results of both cases was very different. (of course a slight discrepancy is acceptable but not like changing Q from 9 to 1.5 !)
After this trail, I wanted to assign one differential port to the inductor instead of 2 single ports. But the problem now is S11 (dB) is like -0.004dB for this differential port.
How should I accurately simulate an inductor with PGS using Momentum? Is there any point that I am missing in my simulation?
Regards,
Hamid
I am trying to simulate an inductor with Patterned Ground Shield (PGS). PGS is on the "poly" layer and inductor is on the top metal.
Since the ground is patterned, I can not use the infinite ///GND/// of Momentum.
One way is to define two single ports for the inductor on the top metal and then adding ground reference ports for each single port on poly layer.
For checking that ground refernce ports will work well, first I didn't use patterned ground and just used a solid sheet of poly under inductor and defined ground reference ports on it. Then I also simulated this inductor when poly layer was removed and instead of it, infinite ///GND/// of Momentum with the conductivity value same as poly was used. Surprisingly simulation results of both cases was very different. (of course a slight discrepancy is acceptable but not like changing Q from 9 to 1.5 !)
After this trail, I wanted to assign one differential port to the inductor instead of 2 single ports. But the problem now is S11 (dB) is like -0.004dB for this differential port.
How should I accurately simulate an inductor with PGS using Momentum? Is there any point that I am missing in my simulation?
Regards,
Hamid