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flex the board because it stresses the PCB, components, component
leads, and solder joints. Because the signal routing in the
memory area is extremely congested, we didn't have the option
of creating holes to allow for the screw points, and the bumpers
solved the problem."
The Bumpon spacers come in both rigid and flexible types,
and are made of polyurethane, which does not conduct electricity.
The press-on spacers use different adhesives, depending on
whether they're used for a high or low energy application.
Either adhesive sets over a 24-hour period.
Low cost PCB thermal sigma¡§Cdelta air flowmeter with improved
thermal isolation
M. Dom¡§?ngueza, , , J. Ricarta, A. Morenob, X. Contest¡§?a
and S. Garrigaa
aGrup de Dispositius Semiconductors, Departament d??Enginyeria
Electr¡§¡ãnica, Universitat Polit¡§¡§cnica de Catalunya, Jordi
Girona 1-3, M¡§¡ãdul C4, 08034 Barcelona, Spain
bCentro Nacional de Microelectr¡§?nica, Campus Universidad
Aut¡§?noma de Barcelona, 08193 Bellaterra, Spain
Received 14 April 2004; revised 24 January 2005; accepted
7 March 2005. Available online 30 April 2005.
References and further reading may be available for this article.
To view references and further reading you must purchase this
article.
Abstract
A new low cost PCB solution for airflow metering is presented.
The structure has been designed to increase the sensor bandwidth
while keeping a total low cost of the sensor and its electronics.
Two silicon dice are used: one in the cold point (a temperature
sensor) and another in the hot point (a heater and a temperature
sensor). The dice are directly placed on top of small Pyrex
structures, which provide the necessary thermal isolation
between the hot and cold points of the sensor, as well as
with the outer environment. The time constant of the sensor
is approximately 1 s. The sensor works in the closed loop
mode, controlled by a thermal sigma¡§Cdelta modulator. Airflow
velocities down to 0.1 m/s can be measured.
IPC (Institute for Interconnecting and Packaging Electronic
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Also, for customer's requests outside our manufacturing capabilities,
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Please choose from the selections below for links to those
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Online Publications
Electronic Links
Useful Downloads
Freeware
Recommended Industry Software
Newsgroups
PCB Assembly Services
PCB Design Layout
PCB Design Services
PCB File Conversions
PCB Global Partners
Other PCB References
Online Publications:
SMTnet is the gateway to the Electronics Manufacturing industry.
They provide the most efficient and effective two-way exchange
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Circuit Cellar - written by engineers for engineers.
Webopedia - the number one online encyclopedia and search
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Industry Specification Sheets: News Groups: Liszts Newsgroups
Keyword = Electronics
Electronic Links:
ECD is a World-Class Electronics Manufacturer in the Portland,
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Providing the complete circuit board solution from design
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RS-274X Gerber Format - this PDF download serves as an extremely
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Note: It is over 50 pages long so expect a long download.
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WS_FTP - the fastest, most powerful windows file transfer
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VIEWMATE - this is a must have for customers new to Gerber
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PKZIP (DOS) - compression utility you can download directly
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WINZIP - another compression utility for windows.
GERBCON.ZIP (DOS) - allows you to convert .DXF Files to usable
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Recommended Industry Software:
Providing the complete circuit board solution from design
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916 Design - CAD Layout, Boardblank & Schematic Libraries.
Accel EDA?, OrCAD?, Protel? compatible products.
Circuit World - Circuit World Online Services, the leading
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email: Stilwell Baker - Joe Zaccari
web site: www.sinopcb.org.......stilwellbaker..
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News Groups:
Liszt Newsgroups Keyword = Electronics
Other PCB References:
Your source for information on prototype PC board fabrication,
rapid prototyping and related topics.
Merriam-Webster Online Encarta
Engineering Ethics
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Prototype thru Production Introduction :
PC board fabrication using mechanical etching methods is not
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Titre du document / Document title
Reliability of low-cost PCB interconnections for telecommunication
applications
Auteur(s) / Author(s)
DUCHAMP G. (1) ; VERDIER F. (1) ; DESHAYES Y. (1) ; MARC F.
(1) ; OUSTEN Y. (1) ; DANTO Y. (1) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Laboratoire IXL - ENSEIRB - UMR CNRS 5818, 33405 Talence,
FRANCE
R¡§?sum¡§? / Abstract
Today the low cost PCB interconnections are widely used for
domestic telecommunication applications. These technologies
are limited by the possible variation of the performances
of substrates and metallization during operating life. The
knowledge of the behaviour of these parameters under stress
conditions allows to optimise the design safety margins and
to predict a probable lifetime. In this paper we show that
the proposed structures (rings and stub resonators) could
be used to discriminate the degradation sources.
Revue / Journal Title
Microelectronics and reliability ISSN 0026-2714 CODEN MCRLAS
Source / Source
Congr¡§¡§s
ESRF 2004 European Symposium on Reliability of Electron Devices,
Failure Physics and Analysis No15, Zurich , SUISSE (04/10/2004)
2004, vol. 44, no 9-11 (626 p.) [Document : 6 p.] (5 ref.),
pp. 1299-1304 [6 page(s) (article)]
Langue / Language
Anglais
Editeur / Publisher
Elsevier, Oxford, ROYAUME-UNI (1964) (Revue)
Mots-cl¡§?s anglais / English Keywords
Microelectronic fabrication ; Integrated circuit ; Printed
circuit ; Damaging ; Ring resonator ; Ring structure ; Durability
; Metallizing ; Performance evaluation ; Telecommunication
equipment ; Interconnection ; Printed circuit board ; Reliability
;
Mots-cl¡§?s fran?ais / French Keywords
Fabrication micro¡§?lectronique ; Circuit int¡§?gr¡§? ; Circuit
imprim¡§? ; Endommagement ; R¡§?sonateur anneau ; Structure
annulaire ; Durabilit¡§? ; M¡§?tallisation ; Evaluation performance
; Mat¡§?riel t¡§?l¡§?communication ; Interconnexion ; Carte ¡§?lectronique
; Fiabilit¡§? ;
Mots-cl¡§?s espagnols / Spanish Keywords
Fabricaci¡§?n microel¡§?ctrica ; Circuito integrado ; Circuito
imprimido ; Deterioraci¡§?n ; Resonador anillo ; Estructura
anular ; Durabilidad ; Metalizaci¡§?n ; Evaluaci¡§?n prestaci¡§?n
; Equipo telecomunicaciones ; Interconexi¡§?n ; Tarjeta electronica
; Fiabilidad ;
Localisation / Location
INIST-CNRS, Cote INIST : 9626, 35400012045820.0040
Copyright 2007 INIST-CNRS. All rights reserved
Toute reproduction ou diffusion m¡§?me partielle, par quelque
proc¡§?d¡§? ou sur tout support que ce soit, ne pourra ¡§?tre
faite sans l'accord pr¡§?alable ¡§?crit de l'INIST-CNRS.
No part of these records may be reproduced of distributed,
in any form or by any means, without the prior written permission
of INIST-CNRS.
No notice refdoc (ud4) : 16182690 Etch copper clad circuits
professionally
Accomodates up to two 8"x 9" double sided PCB's.
Ideal for students and hobbyists. An inexpensive etching
solution.
Contains:
5 litre heavy duty polyethylene etching tank
Air pump and tubing
Sparging unit
Bag of vinyl gloves
Complete instructions
NOTE: This system does not include a heater & therefore
is slower than our other systems. Systems with heaters etch
in 8-10 minutes. Without heaters, etching takes approx 20-25
minutes.
Low cost PCB thermal sigma¡§Cdelta air flowmeter with improved
thermal isolation
M. Dom¡§?ngueza, , , J. Ricarta, A. Morenob, X. Contest¡§?a
and S. Garrigaa
aGrup de Dispositius Semiconductors, Departament d??Enginyeria
Electr¡§¡ãnica, Universitat Polit¡§¡§cnica de Catalunya, Jordi
Girona 1-3, M¡§¡ãdul C4, 08034 Barcelona, Spain
bCentro Nacional de Microelectr¡§?nica, Campus Universidad
Aut¡§?noma de Barcelona, 08193 Bellaterra, Spain
Received 14 April 2004; revised 24 January 2005; accepted
7 March 2005. Available online 30 April 2005.
References and further reading may be available for this article.
To view references and further reading you must purchase this
article.
Abstract
A new low cost PCB solution for airflow metering is presented.
The structure has been designed to increase the sensor bandwidth
while keeping a total low cost of the sensor and its electronics.
Two silicon dice are used: one in the cold point (a temperature
sensor) and another in the hot point (a heater and a temperature
sensor). The dice are directly placed on top of small Pyrex
structures, which provide the necessary thermal isolation
between the hot and cold points of the sensor, as well as
with the outer environment. The time constant of the sensor
is approximately 1 s. The sensor works in the closed loop
mode, controlled by a thermal sigma¡§Cdelta modulator. Airflow
velocities down to 0.1 m/s can be measured.
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Low cost PCB protection is a bump away
by Louise Elliott, Regional Editor -- Design News, February
4, 2002
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St. Paul, MN??Manufacturers often use mechanical fasteners
made of metal or nylon to protect PCBs and other electronic
equipment from heat build-up, short circuiting, vibration,
and board flexing. 3M recently adapted its existing Bumpon
Protective Products??most often used as feet on tabletop equipment??to
offer a less expensive way to get those results while speeding
up the manufacturing process.
Today's larger circuit boards??up to three-foot-square boards
for telecommunications??require fasteners or spacers in more
locations than the four corners, or they will flex toward
the center due to the weight of the circuitry on them. If
they flex too much, they can break. Rigid spacers placed on
other parts of the board can prevent this.
"People are trying to get away from punching holes for
fasteners in PCBs," says Ken Patterson, senior sales
executive for 3M in the United Kingdom, where Bumpon products
for PCBs were first introduced. "In addition, where metal
spacers cost around 26 cents each and nylon spacers cost about
12 cents each, for the same applications, the Bumpon spacers
cost less than half and eliminate the labor costs that go
with drilling holes for mechanical spacers."PCB Design
Services:
Providing the complete circuit board solution from design
through order for quick, low cost circuit boards in small
quantities. Free software that is easy to learn & use
and even quote your board price as you design.
It's the perfect solution for hobbyists, engineers, designers
& technicians needing a 'quick solution' as well as a
perfect learning tool for educators & students. Printed
Circuit boards Since 1989....Prototype to Production
"Your best value PCB production house for Quality Conscious
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Precision Technologies is a Quality Conscious Printed circuit
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Compaq Computers (Houston, TX) uses Bumpon spacers for the
table-top workstation configuration of its AlphaServer DS10
series??including the DS10L, the ultra-thin (1.75-inch) server
that won Design News' 2001 Global Innovation Award.
"The DS10 and DS10L use the same base motherboard, but
in two different enclosures," says Systems Engineer Mike
Rolla, at Compaq's AlphaServer facilities in Marlborough,
MA. Both configurations use four spacers on the back of the
motherboard.
"The bumpers support the module, so the locations were
critical," he says. "They're placed in the dual
inline memory module (DIMM) connector area to mitigate the
stress the module would see while installing DIMMs. We don't
want to
Keywords: Anemometer; Flow sensor; Thermal sigma¡§Cdelta;
Sigma¡§Cdelta
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