[SI-LIST] HSPICE w/ Verilog-AMS model of DC/DC converter (Time Domain)
- From: Simba Julian <sjulian@xxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 12 Jan 2007 10:12:24 -0500
Some time ago I was looking into the feasibility of DC/DC converter
simulation modeling for time domain simulation. There are a few
approximation methods or simplified models out there that take in a few
assumptions but what I got out of a few experiments and probing
different sources is that the primary challenge that makes this
difficult or impractical in some case: 1> obviously the simulation
runtime being micro/milli-seconds rather than pico/nano seconds
simulation runtime is way toooo long and perhaps more importantly 2> the
challenge of incorporating the feedback mechanism that would to sample
the output voltage periodically based on some factor of the switching
rate.... and then begin to adjust the Ton vs. Toff times of the input
voltage before passing through some integrator circuit(output inductors)
to generate my new output voltage. Among many other milestones the
overall goal that I wanted to achieve was to be able to analyze power
distribution from source to load(considering converters, bulk caps,
decoupling caps, and loading devices) in the time domain. =20
With the new functionality of the HDL-AMS extensions to the popular
SPICE tools that many of you are probably using for quick and accurate
answers to multi-GHz simulations..... have any of you looked into or
used any of the HDL-AMS variants to model DC/DC switching converters
that are running in the multi-kHz range? Any of you experts foresee any
other challenges outside of the two that I mentioned above that would
make this a bad or non-trivial concept to model in AMS??
Thanks,
Simba
Simba Julian
Sr. Signal Integrity Engineer
EMC Corporation
Email: sjulian@xxxxxxx
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