Content Inside :
Introduction The Old Days PCB Packages Standards The Schematic Imperial and Metric Working to Grids Working from the top
Tracks Pads Vias Polygons Clearances Component Placement & Design Basic Routing Finishing Touches Single Sided Design Double Sided Design Other Layers Silkscreen Solder Mask Mechanical Layer Keepout Layer Alignment Netlists Rats Nest Design Rule Checking Forward and Back Annotation Multi layer Design Power Planes Good Grounding Good Bypassing High Frequency Design Techniques Double Sided Loading Auto Routing Auto Placement Design For Manufacturing Panelisation Tooling Strips Fiducial Marks Thermal Relief Soldering Basic PCB Manufacture Surface Finishies Electrical Testing Signature Submitting your design for manufacture. For some designers, the PCB design will be a natural and easy extension of the design process. But for many others the process of designing and laying out a PCB can be a very daunting task. There are even very experienced circuit designers who know very little about PCB design, and as such leave it up to the “expert” specialist PCB designers. Printed Board Design”. This standard superseded the old IPC-D-275 standard (also Military Std 275) which has been used for the last half century. Local countries also have their own various standards for many aspects of PCB design and manufacture, but by and large the IPC standards are the accepted industry standard around the world. Before you even begin to lay out your PCB, you MUST have a complete and accurate schematic diagram. Many people jump straight into the PCB design with nothing more than the circuit in their head, or the schematic drawn on loose post-it notes with no pin numbers and no order. This just isn’t good enough, if you don’t have an accurate schematic then your PCB will most likely end up a mess, and take you twice as long as it should. The second major rule of PCB design, and the one most often missed by beginners, is to lay out your board on a fixed grid. This is called a “snap grid”, as your cursor, components and tracks will “snap” into fixed grid positions. Not just any size grid mind you, but a fairly coarse one. Component Placement & Design An old saying is that PCB design is 90% placement and 10% routing. Whilst the actual figures are of no importance, the concept that component placement is by far the most important aspect of laying out a board certainly holds true.
Tags : david l jones, high frequency design, ipc standards, mechanical layer, power planes, circuit designers, pcb manufacture, expert specialist, component placement, electrical testing, pin numbers, schematic diagram, daunting task, finishing touches, alignment
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