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Topic: PCB layout guidelines

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	Information on PCB design with high-frequency rf and multilayer boards. (Site not responding. Last check: 2007-11-02)
		PCBs in vacuum or spacecraft often have solid copper or aluminum cores to carry away components' heat.
		Multilayer PCBs have alignment marks and holes (called fiducials) to align layers and permit the PCB to be mounted in equipment that automatically places and solders components.
		PCB designers often design power supply circuits, including placement of bypass capacitors, used for filtering power supply noise and usually placed near the integrated circuits and bulk capacitors, used to store current for short-term consumption in high-speed integrated circuits and usually distributed fairly evenly throughout the PCB.
	www.cirexx.com /PCB_articles/pcb_design.php (810 words)

	Printed circuit board - Encyclopedia, History, Geography and Biography (Site not responding. Last check: 2007-11-02)
		PCBs designed for use in vacuum or in zero gravity, as in spacecraft, being unable to rely on convection cooling, often have thick copper or aluminum cores to dissipate heat from electrical components.
		PCB Milling uses a 2 or 3 axis mechanical milling system to mill away the copper foil from the substrate.
		A PCB milling machine (referred to as a 'PCB Prototyper') operates in a similar way to a plotter, receiving commands from the host software that control the position of the milling head in the x, y, and (if relevant) z axis.
	www.arikah.net /encyclopedia/PWB (3089 words)

	Engineering and Training Tools
		Below are a number of Guideline Rules to follow and keep in mind when designing PCBs.
		These are general rules that apply for the most PCB fabricators, but it is advisable to check with your fabricator.
		The chemical and photographic processes used to produce a PCB put requirements on the minimum width of trace and the minimum spacing between traces.
	www.advancedmsinc.com /guidelines.htm (627 words)

	PCB layout guidelines - Wikipedia, the free encyclopedia
		When a PCB carries high frequencies, traces may need to be exact widths and lengths to control the characteristic impedance of the trace.
		High-density PCBs may have blind vias, which are visible only on one surface, or buried vias, which are visible on neither, but these are expensive to build and difficult or impossible to inspect after manufacture.
		PCB layout guidelines for RF circuits on a 2-layer or multilayer board:
	en.wikipedia.org /wiki/PCB_layout_guidelines (1403 words)

	Wikinfo \| Printed circuit board
		The simplest PCB is a layer of copper foil glued to a sheet of plastic, often an epoxy glue reinforced with fibreglass.
		The parts and pads of the PCB are designed so that the surface tension of the molten solder centers the parts on their copper pads.
		Multilayer PCBs have alignment marks and holes to align layers and permit the PCB to be mounted in equipment that automatically places and solders components.
	www.wikinfo.org /wiki.php?title=Printed_circuit_board (1131 words)

	freshmeat.net: Project details for Pcb
		Pcb is a handy tool for the X Window System to design printed circuit boards.
		Pcb is intended to be a simple tool without memory and time consuming features like autorouter and autoplacement.
		Essentially all professional printed circuit board manufacturers expect each layer of the PCB to manufactured to be specified by a "Gerber" file, with additional files for the silk screens, solder masks, and - for surface mount boards - the solder paste masters.
	freshmeat.net /projects/pcb (315 words)

	The MAX555 PLCC-to-TQFP Printed Circuit Board (PCB) Layout Guidelines - Maxim/Dallas
		To accommodate the package change in existing designs, this application note was created to provide helpful PCB layout guidelines for designers who have been developing systems based on the PLCC version of the MAX555 and are now required to make a quick and effortless transition from PLCC to TQFP.
		To ease the switch from PLCC to TQFP, this application note suggests means for modifying an existing PCB layout to adapt to the new package with minimal disruption.
		PCB layout changes suggested, to fit the 64-pin TQPF pinout into an existing 68-pin PLCC outline (b).
	www.maxim-ic.com /appnotes.cfm/appnote_number/1120 (913 words)

	PCB Printed Circuit Board Layout Design
		Place filter capacitors so that their terminals physically go right into the printed circuit board traces that carry mainstream of the current to be filtered.
		When doing PCB layout try to use symmetrical routing for paralleled power devices.
		For example, in a typical commercial application with 120-230 VAC input, creepage between primary and secondary circuitry per UL 60950 or IEC 60950 should be 6.4 mm min.
	www.smps.us /layout.html (255 words)

	PCB Layout - Printed Circuit Board Layout and Design
		The connections on the PCB should be identical to the circuit diagram, but while the circuit diagram is arranged to be readable, the PCB layout is arranged to be functional, so there is rarely any visible correlation between the circuit and the layout.
		A PCB will usually have mounting holes and may possibly have cutouts, by cutting an actual size checkplot and placing it in the enclosure, you can see how it will be positioned in relation to other parts.
		Unless the whole PCB is gold plated before etching, this technique is limited in its application, normally, to pads on the edge of a PCB, as an electrolytic plating bar must be attached to the pads, and then removed part way through the PCB manufacturing process.
	www.airborn.com.au /method/layout.html (1115 words)

	PCB Printed Circuit Boards \| Data Acquisition Web
		A PCB milling machine (referred to as a 'PCB Prototyper') operates similar to a plotter, receiving commands from the host software that control the position of the milling head in the x, y, and (if relevant) z axis.
		PCB Printing, the use of conductive ink or epoxy to form traces directly on substrate material.
		Similar to PCB milling in terms of hardware and data used.
	www.dataacquisitionweb.com /pcb_printed_circuit_boards (433 words)

	Pcb layout design info (Site not responding. Last check: 2007-11-02)
		PCB design and PCB layout specialists for OrCAD, Cadence Allegro, Pads and Mentor platforms, offering fast, 24/7 high quality, low cost source.
		PCB Search offers a free information directory for those interested in printed circuit board design, layout, and manufacturing.
		About Nan Ya PCB Established in 1987, Nan Ya PCB, a subsidiary of one of the largest conglomerate in Taiwan the Formosa Plastics Group, is the world top advance PCB and IC substrate provider.
	www.pcb-supplies.co.uk /assembly-pcb-services/pcb-layout-design.html (848 words)

	BEI - Product Development
		Our PCB design team is ready to work with your design engineering team to make your design a reality.
		PCB Design Services is tightly coupled with our manufacturing and test systems and use the best of both IPC and internal manufacturing standards.
		The Hardware and PCB design team uses a number of schematic capture and PCB layout tools to capture and implement a printed circuit board design.
	www.bench.com /viewer/services_product-dev_pcb.asp (250 words)

	Title: PCB Design
		An introduction to the layout of a perforated circuit board (PCB) is examined.
		After a PCB is returned from the shop it will have a shiny clear coat on it.
		If a PCB is to be mounted using standoffs with 4-40 screw holes, the appropriate pad size is 250 mils and hole size is 3mm.
	www.engr.unl.edu /~psnyder/ee317_s03/317_pcb_design.html (703 words)

	PCB Layout Techniques - PCB Layout Services
		Due to the integration of various devices and complexity of the PCB functionally, layout engineers are faced with enormous challenges to produce a layout that meets the systems characteristics.
		Layout is the process of routing the signal path for a given NETLIST from one point to another point.
		In addition, layout information shall be converted to Gerber Data ready to process by the client.
	www.shax-eng.com /pcb_layout_technique.htm (437 words)

	Printed circuit board - Wikipedia, the free encyclopedia
		Most PCBs are composed of between one and sixteen conductive layers separated and supported by layers of insulating material (substrates) laminated (glued with heat, pressure and sometimes vacuum) together.
		A few PCBs are made by adding traces to the bare substrate (or a substrate with a very thin layer of copper) usually by a complex process of multiple electroplating steps.
		Again, JEDEC guidelines for PCB component placement, soldering, and inspection are commonly used to maintain quality control in this stage of PCB manufacturing.
	en.wikipedia.org /wiki/Printed_circuit_board (2134 words)

	EMC Consulting Inc. - Seminars (Site not responding. Last check: 2007-11-02)
		The one to one and a half day in house seminar is targeted to circuit design engineers and PCB layout and packaging designers.
		Fewer personnel need to be tied up in attending this seminar because it is structured so that all of the material pertinent to PCB layout and packaging designers is presented in the afternoon of the one or one and a half day seminar.
		The results of measurements are used to compare different PCB layouts and techniques for scaling the results to PCBs with different dimensions are presented.
	www.magma.ca /~emccons/seminars.htm (257 words)

	Untitled Document
		While begining to design a PCB follow whichever of the two is convienient, either make rough sketch of the layout on paper or go on straight with the software.
		The Inductance in the circuit can be realized on a PCB as a circular arrangement of pads as shown in fig 4 with a diameter of 1 inch.
		An easy method of placing the pads in a circular fashion is to place a pad of 1'' diameter and then place pads of the required size along the circumference of the 1'' pad and then deleting the it.
	www.ee.siue.edu /~mentor/PCB/autotrax/autotrax.htm (1364 words)

	Advanced PCB Resources:PCB Layout Guidelines
		Many practical circuits can be laid out easily if the lumped element model holds for the particular circuit.
		In radio especially, we cannot make this assumption and we must minimize parasitic effects due to layout of components, or take them into account with a more general model and use simulation software such as SPICE.
		use construction paper and a pencil and sketch the board in its actual size; or use component layout software that includes information about the component outlines.
	www.advancedpcb.com /pcblayoutguidelines.html (511 words)

	PCB Design Analysis Software Application Guidelines
		HyperSuite EXT software is primarily for the analysis of electronic Printed Circuit Board (PCB) design as an aid in minimizing potential PCB design problems that can contribute to electromagnetic emissions.
		Application of the software design and analysis tools becomes more beneficial if the PCB design process is properly planned and tailored for their use.
		Any proposed PCB design changes should be carefully considered for possible impacts to other design objectives, such as overall circuit functionality, size requirements, manufacturing constraints, and thermal effects.
	www.radioing.com /eengineer/soft-guide.html (1421 words)

	AP-585 Pentium® II Processor GTL + Guidelines
		The goal of this layout guideline is to provide a system designer with the information needed for the Pentium® II processor and Intel 440 PCIset bus portion of the printed circuit board (PCB) layout.
		These guidelines are valid for the 440FX and future Intel Pentium II processor PCIsets.
		This document provides guidelines and methdologies that are to be used with good engineering practices.
	developer.intel.com /design/PentiumII/applnots/243330.htm (104 words)

	Circuit engineering - PCB layout problems.
		PCB trade magazines also keep a archive of useful articles, etc,.
		If so, when you capacitively couple to the PCB, you will be creating LP filters and start attenuating your signals.
		It would be a shame to segment up your PCB, and just run "hot" traces (power and/or ground) between segments and nullify all of your efforts.
	www.eng-tips.com /viewthread.cfm?qid=20395 (1728 words)

	M&M Specialties, Inc. - PCB Design and Layout
		The task of a PCB designer is constantly challenged by today's evolving semiconductor technological trends and the PCB manufacturing industry.
		Our PCB designers are experienced in analog, digital, and RF as well as current PCB manufacturing requirements: - Each design is given special care and attention to ensure a reliable product, while still meeting your time and board constraints.
		Internally we are constantly analyzing our design processes and methodologies to ensure that we can meet our clients demands for reduced timescales and design complexity.
	www.mmspec.com /pcb_design_layout.html (387 words)

	Advanced Circuits Printed Circuit Board Manufacturer, Experts in Fabricating Electronic PCB's. (Site not responding. Last check: 2007-11-02)
		PCB Puzzles: Take a break and try your skills at some PCB crossword puzzles and word searches.
		PCB Information: Additional PCB information to assist you.
		PCB Layout Software: Useful software for designing circuit boards, converting and translating databases and optimizing layouts.
	www.4pcb.com /circuit_board_convenient_electronic_site_map.htm (1355 words)

	Streamlined Design: cost-effective PCB layout
		PCB layout can employ technologies from simple to advanced.
		High Voltage We work from UL guidelines and engineers ' test results to design high voltage circuits that function properly from the first time they are switched on.
		The electronics for many mass-produced toys are embedded by this system, which can be identified by the fl glob of plastic sitting on the board.
	www.goldengategraphics.com /ee_page2.htm (838 words)

	PCB Train - Fast Turn Around PCB Prototyping - CAD Layout
		PCB Train CAD is a low cost CAD layout service for simple 1 and 2 layer designs.
		We have many years of experience in both CAD layout and pcb manufacture and assembly.
		If you have purchased a prototype on PCB Train, and we have made a track routing error or a component fails to fit, we will rectify the design and produce a new prototype (single circuit) free of charge.
	www.pcbtrain.co.uk /cadlayout.php (614 words)

	Henriksen - PCB Layout (Site not responding. Last check: 2007-11-02)
		Henriksen is able to layout PCBs on single, 2, 4 or more layers.
		We are familiar with EMC and safely critical parts and layout.
		Should you be interested in converting an existing PCB to newer technology, or maybe you need us to lay out a new design, please contact us.
	www.henriksen.co.th /serv_pcb.html (147 words)

	guidelines layout pcb Index - UnhealthyLiving
		PCB design rules, printed circuit board layout guidelines, free...
		PCB layout- basic printed circuit board design guidelines for smps switching mode power supply- tips, UL requirements.
		Design Guidelines To help you in designing a quality manufacturable PC Board we are offering our years of experience in PC Board Design and Manufacturing in...
	www.unhealthyliving.com /PCB/guidelines-layout-pcb.html (534 words)

	Best free pcb layout downloads. Professional PCB Design System with easy-to-learn user interface. Professional PCB ...
		DipTrace is an advanced PCB design software application that consists of 4 modules: PCB Layout with efficient auto-router, Schematic Capture, Component and Pattern Editors that allow you to design your own component libraries.
		Besides being very easy-to-use, which is rare for a PCB design tool, this software possesses a very intuitive user interface and many innovative features.
		PCB Designer is a cost effective, easy to use electronic printed circuit board PCB layout application.
	www.freedownloadmanager.org /downloads/pcb_layout_software (272 words)

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