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Using the Differential Calculator ^0 M. l1 R" O: m) Q
9 U2 l/ J$ i4 xUse 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.! [$ k8 r0 p) R% |9 u
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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.) ?2 s0 g1 M' T6 }' O" ?
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4 Q( w8 ?- \; O- L4 p: ]6 j4 zLayer name/ M6 Q2 Q: g) v* Q% E& N- ^
# p' q' K& T- q7 r ZIndicates the ETCH/CONDUCTOR layer for which you are running the calculation. By default, the TOP/SURFACE layer appears.& d- ?" Z3 u' _6 ^5 g" N
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Differential impedance
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Specifies the impedance of the differential pair. Calculated for a pair of lines having the specified Line width and Primary gap on the layer.) s( b& i$ n6 P( T L
1 C+ d$ J. p9 ?Single-line impedance
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$ D# q; H u1 j& bIndicates the impedance of one line of etch on the selected layer.8 @1 c h! d4 b
+ L; E4 a) S% X( r gChanging 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.7 m6 P# k; q7 X& P4 \7 e5 U
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Line width
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% r; [2 r+ j U: L0 n2 g: a- y' L* mSpecifies 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.( w" g9 d, A- A* [
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Primary gap2 _% e1 v+ X4 L* a% B
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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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