Browse Prior Art Database

Programmable Chip Heater for TCM Thermal Redistribution

IP.com Disclosure Number: IPCOM000120953D
Original Publication Date: 1991-Jun-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 51K

Publishing Venue

IBM

Related People

Abrami, A: AUTHOR [+3]

Abstract

TCM design is faced with an increasing problem of temperature spread from chip to chip due to varying individual chip powers on the substrate. Disclosed is the novel use of a programmable resistor chip at previously unused chip sites to increase the temperature of low temperature chips. (Image Omitted)

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 88% of the total text.

Programmable Chip Heater for TCM Thermal Redistribution

      TCM design is faced with an increasing problem of temperature
spread from chip to chip due to varying individual chip powers on the
substrate.  Disclosed is the novel use of a programmable resistor
chip at previously unused chip sites to increase the temperature of
low temperature chips.

                            (Image Omitted)

      The resistor chip would be programmed to an optimum wattage so
that the overall TCM temperature spread would be reduced.  Each
unused site could receive its own discrete wattage in this scheme.
The chip voltage source would be the existing chip power supplies,
and the required wattage, based on thermal model simulation, would
then project the needed resistance value at each location.  The
resistor chip values would be mask programmable by changing the
location of contact shown in the figure.  Based on the required
physical dimensions of the chip, a number, N, of mask programmable
resistors could be determined so that the reliability of the chip and
uniformity of the thermal distribution generated by these resistors
over the chip is optimized.  Then, given Vcc and the desired chip
power dissipation, P, the value of each programmable resistor can be
calculated as:
           R = (N)(Vcc)(Vcc)/(P)

      An automated chip design system would facilitate the production
of a chip heater with the desired power dissipation characteris...