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Re: ic transformer
Unfortunately, I have moved on to a different project and field... Ask on the forum for examples of a single coil spiral inductor, or HFSS examples in general, somebody should have.
Just delete one of the two "red" ports and one of the two "blue" ports and replace it with the conducting metal. Then the simulation should work fine. For slightly more accuracy, redesign the whole terminal area so that it's symmetrical.
You only have an exact voltage ratio if the transformer is absolutely ideal. In a non-ideal transformer, some energy will be dissipated and some reflected back to the source, so the destination voltage will be lower than expected. If energy goes through the transformer in the opposite direction...
The port is wrong. A lumped port should go between two conductors, with the integration line running from one edge to the other edge, touching the conductors. Your port goes way up into space, it does not end on the second conductor (the signal line). It is shaped like a waveport, not like a...
By default, the plot will only display one variation of a variable (if you've done a parametric sweep). Go to "Families" in the trace options, and select all values.
I've had problems where I change a setting and HFSS does not realize that it now needs to rerun the simulation. Try closing HFSS, deleting the .hfssresults folder, and running the simulation again. Now the mesh operation should be taken into account.
HFSS mesh reduction
1. Model the traces as 2D impedance/finite conductivity surfaces rather than 3D metal.
2. Delete any trace you think won't influence things, or combine parallel traces into a single trace. Obviously, for this you have to know enough EM theory to know which simplifications...
The equations for two-port Z parameters are:
V1=Z11*I1+Z12*I2
V2=Z21*I1+Z22*I2
The equations for an ideal transformer are:
V1=jwL1*I1+jwM*I2
V2=jwM*I1+jwL2*I2
The two sets of equations have the same form.
For a single inductor, you can used either Y-parameter or Z-parameter equations, they...
Yes. The AC component of the voltage on VCC is zero. From an AC perspective, this trace functions identically to a ground trace.
(You can separate between AC and DC like this because electromagnetic fields are linear.)
In the import options, you can define the height/thickness/properties of the layers using an attached file. Here is my file (with numbers changed):
layerfileall.tech:
6 shield red 0.0 0.0
21 mask1 tan 0.0 0.0
27 mask2 tan 0.0 0.0
34 m1 grey 500.0 500.0
35 via2 grey 1000.0 800.0
36 m2 grey...
Here (at the bottom) is a cool and simple structure.
http://www-antenna.ee.titech.ac.jp/research/animation-e.html
You can use HFSS-MATLAB-API to automate the drawing. Or else just copy and paste, or duplicate along line in HFSS.
If you want to know Z0 of a transmission line, it is determined by the transmission line structure, not the port settings. To measure this Z0, you should use a wave port. A lumped port may give a wrong value for "Port Z0".
I believe the Z0 setting for lumped ports is only used for adjusting...
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