Thanks for the directions and the individual notes everyone. Glad there
are a lot of people who are willing to help and educate.
I read from my class notes that the FFT needs a repetitive signal to do the
transform. The TD domain tools truncate the signals to make them
repetitive. Everything works good.
Now I am still puzzled by the bit patterns. Are they always repetitive so
that in the simulation world, we can represent them as an repetitive
excitation signal ?
On Mon, Aug 10, 2015 at 5:48 AM, Havermann, Gert <Gert.Havermann@xxxxxxxxxxx
wrote:
Hi Sipi,
have you ever heard of a Guy named Fourier? This crazy Guy found out that
every signal shape (in Time Domain) is just a superposition of Sinewaves
with different frequencies.
If Fourier sounds familiar to you, you don't need to read the following,
you can figure it out on your own.
The Simulation Result is not the response to one special signal, it
represents the general behavior of the DUT regardless of how it is created.
The Pulse CST uses contains a broad range of frequencies (the narrower the
pulse, the higher the bandwidth) after simulation, Fourier transformations
give you a frequency Domain Result. HFSS uses Sine waves which result
directly in a frequency Domain Result. If needed, the Results can be
transformed into Time Domain, all without losing information (you lose
precision based on the bandwidth limitation).
BR
Gert
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
Im Auftrag von sipi 3083
Gesendet: Samstag, 8. August 2015 20:55
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] 3D solver excitation
Hello,
Looking at the excitation options in the 3D solver, the default option is
a time domain Gaussian signal , for example in CST MWS. I don't know what
kind if signal is default in HFSS. How does this excitation signal matches
with the real world signals ( 1010 bit patterns ) ? Are the signals
generated by the ASICs in the big systems any different from the simulation
tools ?
I do not have any hardware experience and cannot correlate the simulation
world to the real world.
- Sipi
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