Cart (Loading....) | Create Account
Close category search window
 

A CPU chip-on-board module

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

7 Author(s)
Tanaka, A. ; Res. Lab., Hitachi Ltd., Ibaraki, Japan ; Shinohara, H. ; Yamada, K. ; Honda, M.
more authors

A CPU chip-on-board module for low and midrange computers is described. The module consists of a CPU bare chip, 24 SRAM's packaged in SOJ packages, and some decoupling capacitors. The module substrate is a printed circuit board (PCB) made of bismaleimide-triazine resin. The module (156 mm×58 mm) consists of four signal metal layers and four power/ground metal layers. A square clearance hole (17 mm×17 mm) for the CPU is formed in the central part of the PCB. A thermal spreading metal is glued to the PCB from the rear side, covering the square hole, and the CPU chip is die-bonded onto the metal plate. The thermal resistance can be made smaller than 2°C/W with 0.4 m/s of wind velocity. Numerical analysis of electrical characteristics of the module shows that it can reduce signal delay time from the CPU to cache memories by 10% compared with that of a daughter board type module with the CPU packaged in a pin-grid array package. It is estimated that simultaneously switched noise can be reduced by 60% from that of the daughter board type module

Published in:

Components, Packaging, and Manufacturing Technology, Part B: Advanced Packaging, IEEE Transactions on  (Volume:17 ,  Issue: 1 )

Date of Publication:

Feb 1994

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.