AWG G3 PAD FOR PS3 Dokumentacja Pobierz pdf (Strona 119)

Maintaining Signal Fidelity 5 DUT Board Performance Considerations

System Reference, January 2001

119

Signal Inhomogeneities

Inhomogeneities cause reflections in the signal paths as

well as signal deterioration due to attenuation and phase

changes.

Minimize signal inhomogeneities by:

• avoiding runs of wire on the DUT board

• avoiding vias on the board if possible. If the use of a via

is unavoidable, make sure to specify a 50 Ohm equiva-

lent via to the custom DUT board manufacturer.

• avoiding stubs. If you must have a stub, for instance to

connect a socket to a signal track, place the junction to

the stub between the pogo pin and the DUT pin, and

insert a surface-mounted series resistor between the

junction and your socket.

• avoiding unnecessary sharp corners in strip lines. Use

a radius, or a chamfered corner instead.

avoiding mouse bites and size changes in strip lines.

• using the correct procedures when soldering coax

cables to strip lines—minimize the length of unshielded

core, provide a good ground connection for the coax

shield.

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AWG G3 PAD FOR PS3 Dokumentacja Strona 119