what is behavioral modeling,what kind of job it is.

[yanquijiang@gmail.com]

Hi all,
i am new here, i am just curious about what RF behavioral modeling
is all about. what kind of job it is? I just got an offer of a
vacancy,and the boss told me to read some behavioral modeling material
in RF ic and wireless communication. Is that a promising work?

thanks

 

[Paul Burridge]

On 8 Dec 2005 03:42:43 -0800, "yanquijiang@gmail.com"
<yanquijiang@gmail.com> wrote:

Hi all,
i am new here, i am just curious about what RF behavioral modeling
is all about. what kind of job it is? I just got an offer of a
vacancy,and the boss told me to read some behavioral modeling material
in RF ic and wireless communication. Is that a promising work?

This group seems to have died lately. No one seems to post to it any
more. :-(
--

"What is now proved was once only imagin'd" - William Blake

 

[Joel Kolstad]

<yanquijiang@gmail.com> wrote in message
news:1134042163.674321.24580@f14g2000cwb.googlegroups.com...

i am new here, i am just curious about what RF behavioral modeling
is all about. what kind of job it is?

You sit around and try to come up with mathematical models of various
components such as transistors, inductors, and even things as seemingly simple
as vias. (At high enough frequencies, all of these have highly non-trivial
equivalent circuit models.) Historically this was done by building your
behavioral model out of a network of ideal components (e.g,. for a physical
capacitor, you might start with a capacitor that has an inductor to model lead
inductor, a resistor across it to model loss, etc.), although these days often
'black box' models that represent behavior in terms of a rational polynomial
or even just a fancy table are often used. (The model you use depends largely
on what sort of simulator you're planning to use the model in...)

In many cases, a significant part of the job entails making device
measurements in the first place, and this is also somewhat more challenging
than you might initially think, e.g., due to correctly de-embedding fixturing
effects from, say., an 0201 resistor at 5GHz. Alternatively, initial
measurements might come from a field solver, which is highly accurate but slow
(and hence not practical use for rapid simulation by circuit designers).

I just got an offer of a
vacancy,and the boss told me to read some behavioral modeling material
in RF ic and wireless communication. Is that a promising work?

Sure, it's "promising" -- for the right type of individual. It is a vital
part of modern IC design -- circuit designers can't correctly simulate their
designs without good models -- so you do get to share in the glory of an IC
coming back from a fab and working correctly on the 1st try because all your
models matched up with reality.

From an abstract point of view, the job is trying to 'twiddle the knobs' (and
occasionally add and remove knobs) on your model such that they match known
data.

---Joel Kolstad

 

[Evgenii Rudnyi]

You sit around and try to come up with mathematical models of various
components such as transistors, inductors, and even things as seemingly simple
as vias. (At high enough frequencies, all of these have highly non-trivial
equivalent circuit models.)

If your original electromagnetic model is linear, then nowaday you can
simplify your life by means of formal model reduction. You may have a
look at our paper where we have tried to compare compact modeling and
model reduction

J. Lienemann, E. B. Rudnyi and J. G. Korvink.
MST MEMS model order reduction: Requirements and Benchmarks.
Linear Algebra and its Applications, 2005.
Corrected proof is available on-line at
http://dx.doi.org/10.1016/j.laa.2005.04.002

(if you do not have access to ScienceDirect, please contact me directly
for a reprint)

Best wishes,

Evgenii Rudnyi
--
http://Evgenii.Rudnyi.Ru/
http://www.imtek.uni-freiburg.de/simulation/mor4ansys/

Half-day course before EuroSimE, Grand Hotel di Como, Sunday April
23rd, 2006. Automatic Compact Modelling for MEMS: Applications,
Methods and Tools.
http://www.eurosime.org/course.htm#c4