By Charles Hamilton
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Extra info for A Guide to Printed Circuit Board Design
With RF circuitry, extra care must be taken with the design layout. Tracks must be kept short, a good ground plane maintained, and decoupling components placed as close as possible to their respective stages. (12) VHF/UHF considerations. With VHF/UHF designs, the tracks themselves may become part of the actual circuit. 'Stripline' (see Glossary) designs especially will specify a track length and width, which must be followed exactly. In this situation, the total involvement of the engineer/circuit designer is crucial to a successful design.
Power conductors. Capacitance can also be designed into a PCB to act as a filter for power conductors. Usually, voltage supply lines need high capacitance to ground to reduce noise and minimise voltage changes due to load variations. In this case, maximum capacitance can be provided by running the supply lines parallel, or one over the other (on double-sided boards), and also by making the supply lines as wide as possible. PROMs and ROMs — (programmable) read-only memories — can easily be used in much the same manner as other types of transistor - transistor logic (TTL) design elements, with the usual attention being paid to ground distribution networks and decoupling.
In this case, maximum capacitance can be provided by running the supply lines parallel, or one over the other (on double-sided boards), and also by making the supply lines as wide as possible. PROMs and ROMs — (programmable) read-only memories — can easily be used in much the same manner as other types of transistor - transistor logic (TTL) design elements, with the usual attention being paid to ground distribution networks and decoupling. Having considered all of the foregoing and with the design layout completed, it must now be checked against the circuit diagram.