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Using the Differential Calculator$ F2 y% A3 h; ~& u4 A9 ]
) s7 }. E- N0 V4 Z; j" ]5 o) G7 yUse the Differential Calculator to perform what-if scenarios to determine what combinations of line width and primary gap values can help you obtain a particular differential impedance. The calculator is available from the Electrical CSet- and Net worksheets.
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' l* @6 m. L5 f$ J0 f* ]You can perform calculations only for edge-coupled differential pairs on a selected ETCH/CONDUCTOR layer and account for material, thickness, electrical conductivity, dielectric constant, loss tangent, and shield.& S* W+ X$ L9 m
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Layer name
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Indicates the ETCH/CONDUCTOR layer for which you are running the calculation. By default, the TOP/SURFACE layer appears.
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Differential impedance
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9 d, Q( e t" PSpecifies the impedance of the differential pair. Calculated for a pair of lines having the specified Line width and Primary gap on the layer.
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( X; h) }9 m" `Single-line impedance
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Indicates the impedance of one line of etch on the selected layer./ L4 `9 w- h V m# P
* o4 g) G3 H' _9 o' ]Changing this value automatically recalculates the Line width field. Each time the Line width field in this calculator changes--either when you directly modify it or when you select it to be recalculated--this value is recalculated, too.
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% u$ ^- q* j: U$ ZLine width
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Specifies the minimum width of each line of the differential pair. Changing this value automatically recalculates the Single-line impedance field. And changing the Single-line impedance field automatically recalculates this value.
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Primary gap
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7 r( e6 Q! l' ?Indicates the ideal edge-to-edge spacing between the pair that should be maintained for the entire length of the pair.
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发表于 2012-12-3 13:45
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