temperature simulation of a chip heater

Hi everybody,

does anyone know how to simulate the thermo-electrical behaviour of a
chip heater? We have to design an on-chip temperature control for an
ASIC which should contain an on-chip heating and should control it's own
temperature by some on-chip temperature sensors (e.g. diodes or ptat).
I know that we simply can use spectre to simulate the behaviour of the
electrical part depending on the temperature but what's about the
heating?. Does anyone has an idea how we can simulate the chip
temperature (and possibly it's distribution across the chip) depending
on the electrical parameters of the circuitry (e.g. heating current or
power dissipation). The chip should be directly used to heat up and
analyze a liquid.
--
Best regards

Dr. Frank Nitsche
Technical Manager Chipdesign

MAZeT GmbH

to answer by email remove the NOSPAM

 

Hi Frank,

It should be possible to use spectre to do what you require
with some effort. You first need to formulate the equations that
describe the heat generation/dissipation in terms of the physical
quantities such as heater element geometry, thermal conductivity
of the heating element, sp. heat capacity of the material enclosing
the heating element, thermal resistance between the heating element
and the enclosure and the surrounding medium(in this case the liquid)
also taking in to account the heat losses due to conduction, convection
and radiation. Most of the equations could be derived fairly easily
by looking at the principles of heat sink design with some additional
information about specific materials being used.
Then you could tie these factors to the electrical quatities for
simulation in spectre. SpectreHDL or Verilog-A will the language of
choice, which should work well with the spectre spice models.

Regards
Raman

 

Hi Frank,

I would recommand you to contact MicRed Ltd.
http://www.micred.com/
They are experts in electro-thermal simulation, and measurement.

Look at the following link :
http://www.micred.com/prodserv/products/software/therman/examples.html
(I have used their tool (THERMAN) to generate the thermal map of
the digital circuit in the middle of this page.)

They are also selling a measurement kit which includes a
device heater doing what you are trying to implement.
http://www.micred.com/prodserv/products/measdev/test_dies/index.html

Hope it helps.
Regards,

===================
Kholdoun TORKI
http://cmp.imag.fr
http://tima.imag.fr
===================

-------- Original Message --------
Subject: temperature simulation of a chip heater
Date: Fri, 07 May 2004 14:02:43 +0200
From: Frank Nitsche <>
Reply-To:
Newsgroups: comp.cad.cadence

 

Hi Kholdoun,

thanks, I think this will be the best approach to solve the problem.

Frank.

--
Mit freundlichen Grüßen

=========================================================
Dr. Frank Nitsche
Technischer Leiter Chipdesign

MAZeT GmbH Email: mailto:
Göschwitzer Str. 32 Tel : (3641) 2809 0
D-07745 Jena Fax : (3641) 2809 12

Besuchen Sie bitte unsere Web-Seiten: http://www.MAZeT.de
=========================================================