RF AC/DC coupling circuit using general purpose solid-state relay
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United States of America Patent
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Mar 6, 2012
Grant Date -
Dec 31, 2009
app pub date -
Mar 24, 2009
filing date -
Jun 27, 2008
priority date (Note) -
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Abstract
A system and method for overcoming the parasitic elements associated with off the shelf or general purpose solid-state devices configured to operate as RF AC/DC signal coupling networks. An AC/DC signal coupling network may comprise a general purpose solid-state relay device and two inductors having values carefully chosen to compensate for the imperfections and intrinsic parasitic elements associated with the solid-state relay. The inductors may also have values carefully chosen to compensate for the parasitic elements of the neighboring or coupled circuit, and for the capacitance that is associated with the printed circuit board bond pad that is directly dependent upon the area of the pad and distance to the neighboring conductors. The inductors may cause the input path to become inductive as the signal frequency increases, and also improve the input return loss over the RF input range.
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