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https://designers-guide.org/forum/YaBB.pl Modeling >> Passive Devices >> A few questions about inductors simulation with HFSS https://designers-guide.org/forum/YaBB.pl?num=1235705814 Message started by Yutao Liu on Feb 26th, 2009, 7:36pm |
Title: A few questions about inductors simulation with HFSS Post by Yutao Liu on Feb 26th, 2009, 7:36pm hello everybody, I want to model and to analyze inductors with HFSS. I found that the poly layer was not added when I read some examples. Why? Is the simulation more accurate after adding the poly layer? And is it appropriate to only add those shield metal layers under the inductor,when I want to simulate the floating shield inductor which is some metal layers are added underneath the inductor? Is there anything else I should set up due to the shield metal layers? thanks! |
Title: Re: A few questions about inductors simulation with HFSS Post by pancho_hideboo on Feb 27th, 2009, 7:31pm Yutao Liu wrote on Feb 26th, 2009, 7:36pm:
Is Poly Layer used in your inductor structure ? Just Poly Layer isn't used in inductors of examples you saw, is it ? Yutao Liu wrote on Feb 26th, 2009, 7:36pm:
What do you refer as "those" ? Is there any relation with Poly Layer ? If your process have only two metal and one poly, you have to use poly layer as shield layer. Yutao Liu wrote on Feb 26th, 2009, 7:36pm:
This is also true for your another question. No one except for you knows your specific situations. http://www.designers-guide.org/Forum/YaBB.pl?num=1231747377/0#0 |
Title: Re: A few questions about inductors simulation with HFSS Post by Yutao Liu on Mar 1st, 2009, 7:04pm Thanks for pancho_hideboo's replying! I am new with HFSS, so i don't quite understand the settings such as boundarier and terminals in HFSS. pancho_hideboo wrote on Feb 27th, 2009, 7:31pm:
Yes, poly layer was not used in inductors of the example I mentioned. So, the poly layer should be omitted in the model due to its absence in the inductor structure? pancho_hideboo wrote on Feb 27th, 2009, 7:31pm:
There are 1 poly layer and 6 metal layers in the process i use, and i use the metals as floating shield layers rather than the poly. I actually want to know whether HFSS would take the shield layers into account when analyzing when these shield layers is "floating", that is, they aren't connected to any terminals or "ground" and they are not connected to the spiral inductor. Furthermore, the floating shield layers are used to limit the effect from eddy current formed in the substrate. Can HFSS take the eddy current into account during calculation by default? If it can't, how should i do? |
Title: Re: A few questions about inductors simulation with HFSS Post by pancho_hideboo on Mar 2nd, 2009, 5:42am Yutao Liu wrote on Mar 1st, 2009, 7:04pm:
Yutao Liu wrote on Mar 1st, 2009, 7:04pm:
Yutao Liu wrote on Mar 1st, 2009, 7:04pm:
Yutao Liu wrote on Mar 1st, 2009, 7:04pm:
I can't understand why you are confusing. There is no special problem at all in your situation. |
Title: Re: A few questions about inductors simulation with HFSS Post by Yutao Liu on Mar 4th, 2009, 4:40am pancho_hideboo wrote on Mar 2nd, 2009, 5:42am:
I am confusing because I am not sure which types of boundaries I should assign. Should I draw a new rectangle covering the bottom face of substrate and assign it as "Perfect E" boundary? I doubt about this assignment because I want to model a lossy substrate. |
Title: Re: A few questions about inductors simulation with HFSS Post by pancho_hideboo on Mar 4th, 2009, 4:53am Yutao Liu wrote on Mar 4th, 2009, 4:40am:
You can also use perfect magnetic wall. If your substrate thickness is enough large, you might be able to omit air. Also you can set radiation, absorption, periodically boundary conditions. Mathematically these boundary conditions are well-known Dirichlet boundary condition, Neumann boundary condition, Mixed boundary condition, Sommerfeld radiation condition, etc... You should read text book about electric magnetic theory and then manuals of Ansoft HFSS. |
Title: Re: A few questions about inductors simulation with HFSS Post by Yutao Liu on Mar 5th, 2009, 4:17am pancho_hideboo wrote on Mar 4th, 2009, 4:53am:
I'm a student for analog/RF circuit design, so I am not quite familiar with microwave design, especially modeling passive component in HFSS. I just want the equivalent circuit of a floating shielded inductor to do my circuit design. Is there any other better ways to achieve my goal? Or, which text books about electric magnetic theory is suitable to me? |
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