Cadence tool suggestion

[Kuan Zhou]

Hi,

I am currently designing a chip working under a noisy environment. For
example, the chip is working in a place with lots of strong
electromagnetic fields. These fields will impact my circuit
performance definitely. Is there a tool in Cadence to analyze such effects?

What are the tools to simulate and measure the temperatures and
rise/fall times over the entire chip. I often saw pictures shown by people
with blue regions for low tempearature and red regions for high
temperature. But I never know the tools they used to do such things.

Thank you in advance!

Kuan

 

[G Vandevalk]

I too would like to hear this.

I have written a spectre/spice netlister that dumps out the location of each
extracted component into x= and y= parameters. (used the locations that I
placed there
in the diva extract run !!!)
Then each of the components were given an initial dtemp=0 parameter.
(i.e. I had the processing group add dtemp to the temp parameter. )
Then I run a "typical" simulation run. Then I process the power dissipated
in each of the
devices ( mostly npn's and resistors ) and I calculate how much each device
would raise the
local temp. (more of a guess based on location. ... ) and how much it would
raise the temp of
local neighbours ... ( based on proximity ... tailing off rapidly ... )
Now I insert the calculated set of dtemp parameters back into the netlist
and rerun the simulation.
This results in a new set of dtemp parameters ... rerun this loop until
convergence or thermal runaway ( some dtemp is >tmax ) or after several
runs. (we may have some positive feedback in our crude dtemp model so go
back & damp the dtemp change rate .... )
This was plugged into a framework that would then display dtemps on devices.
I have seen this turned into
a thermal map ... YMMV

Note that large magnetic noise is an animal of a different stripe
completely.
Typically the smaller the x-section -- the less the pickup .. Good luck in
any modeling here.

-- G

"Kuan Zhou" <koy2@cisunix.unh.edu> wrote in message
newsine.OSF.4.62.0504271642100.214649@hypatia.unh.edu...

Hi,

I am currently designing a chip working under a noisy environment.
For
example, the chip is working in a place with lots of strong
electromagnetic fields. These fields will impact my circuit
performance definitely. Is there a tool in Cadence to analyze such
effects?

What are the tools to simulate and measure the temperatures and
rise/fall times over the entire chip. I often saw pictures shown by people
with blue regions for low tempearature and red regions for high
temperature. But I never know the tools they used to do such things.

Thank you in advance!

Kuan

 

[Andrew Beckett]

I don't know of a Cadence tool that does this in the CIC space (I believe the
PCB tools have something like this).

Perhaps Kuan was thinking of tools like VoltageStorm/ElectronStorm/SignalStorm
which use a colour map to indicate areas of (say) electromigration problems.
Or SubstrateStorm (now Substrate Noise Analyst) which does an AC analysis of a
noise perturbation to show how it propagates to an area on the layout via the
substrate.

Regards,

Andrew.