By Charles Hamilton
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Extra resources for A Guide to Printed Circuit Board Design
4) Pads and tracks should be identified using identifiers common to the particular drawing-office as a whole. (5) Pads and tracks on any half-grid to the standard grid setting for the particular line drawing should be indicated, i. e. identity half-grid on X dimension only; identify half-grid on Y dimension only; identify half-grid on X and Y dimension. (6) Indicate changes of track width within any track route. (7) Indicate where any pad or track is placed completely off-grid, relative to the nearest pad or track on grid, using 1:1 dimensions.
This means in effect that the ground distribution system should be as wide as possible everywhere, even if this means large variations in the width(s) of the ground tracks. To further approach the ground plane ideal, a grid of horizontal and vertical power and ground tracks on opposite sides of the board should be tied together using plated holes at each dual-in-line package (DIP) site — or at least as often as possible. The tying together of horizontal and vertical tracks is important electrically, because long 'floating' distribution lines can easily act as antennae or noise distribution systems, thus allowing noise to propagate and 26 A guide to printed circuit board design exceed device thresholds.
When the line drawings prepared for the various master patterns are completed, flat-bed secondary masters are taken and submitted for input via CAD, the line drawing masters being retained in the drawing-office. 1). It follows that the Biro plots must be checked systematically and carefully. This task is usually a straightforward one, as the Biro plot will be returned at the same scale as the line drawing submitted. Therefore, the best method of checking is to lay the Biro plot over the original line drawing on the light-table and subject it to the most rigorous and careful scrutiny.
A Guide to Printed Circuit Board Design by Charles Hamilton