Browse Prior Art Database

Conductive Cooled Processor And Main Memory at Cryogenic Tempera- Tures

IP.com Disclosure Number: IPCOM000099936D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Carlson, HA: AUTHOR [+3]

Abstract

Disclosed is a cryogenic temperature CMOS computer system which has its main memory closely physically coupled to a processor in order to enhance system performance. This is achieved by means of separately mounting these system components in a conduction cooling frame.

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This is the abbreviated version, containing approximately 91% of the total text.

Conductive Cooled Processor And Main Memory at Cryogenic Tempera- Tures

       Disclosed is a cryogenic temperature CMOS computer system
which has its main memory closely physically coupled to a processor
in order to enhance system performance.  This is achieved by means of
separately mounting these system components in a conduction cooling
frame.

      The figure shows a cooling/support frame directly attached to
the cold head of a cryocooler in an evacuated cryogenic chamber.  The
processor chip carrier is mounted directly to this cooling frame,
which enables the CMOS chips to operate at the lowest temperature
possible.  The well-known effect of CMOS performance enhancement at
low temperature can be optimized by using this configuration.

      To maximize overall system performance, it is necessary to
maintain minimum cable length between the processor and main memory.
The figure shows a set of memory cards mounted directly above the
processor carrier, thus minimizing this distance.  The memory chips
are mounted on a card in direct contact with a metal heat sink, which
has etched openings to allow connections from the chips to the card.
The card heat sink is clamped into the cooling frame by one of a
number of commercially available locking card guides.  The main
memory chips thus have a direct cooling path to the cryocooler cold
head.  They run at a somewhat higher temperature than the processor
chips because of the length of the path.  Since the me...