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Disclosed is a technique for connecting controlled-impedance flexible cables to printed circuit cards and boards through the use of a pinned connector.
English (United States)
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Controlled-Impedance Tailgate Connector
Disclosed is a technique for connecting controlled-impedance flexible cables
to printed circuit cards and boards through the use of a pinned connector.
The tailgate connectors used in some packaging schemes have relatively
long signal and power conductors. Depending upon their positions, the
impedance can change by a large degree and lead to excessive cross talk. In
contrast, the printed circuit lines on flex ribbon connectors offer a controlled
impedance for the connections. The ribbon can be soldered to printed circuit
cards and boards or use a pad-to-pad pressure-contact technique, but for some
of the card and board technologies surface solder and pad-to-pad contacts are
not available. It is imperative that pin-in-hole techniques be used.
The figure shows a portion of the printed circuit card at the bottom with a few
lines to be connected. In the center is a flexible circuitized matched impedance
ribbon. The hole patterns on the printed circuit card or board matches that on the
flexible circuit ribbon.
Above is a rigid structure with an electrically isolated pin array of either single
or multiple rows. The pins will be plugged through the flexible ribbon and
subsequently into the card or board, and soldered to complete the connection.
The pins will add a small amount of capacitance which can be minimized by
using the shortest practical pin length.
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