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以后上传图片。具体的说法如下:If crossing a plane split is completely unavoidable, proper placement of stitching caps- @, _, t$ H3 j7 ?' D
can minimize the adverse effects of EMI and signal quality performance caused by7 `1 C! J3 N( c9 x# }! `
crossing the split. Stitching capacitors are small-valued capacitors (1 μF or lower in5 S) i @/ t3 e0 ]! ~, A
value) that bridge voltage plane splits close to where high-speed signals or clocks cross
7 F" Z' v9 J `9 \" }the plane split. The capacitor ends should tie to each plane separated by the split. They
. a/ h4 |8 a4 [- t0 |7 ]are also used to bridge (or bypass) power and ground planes close to where a highspeed2 \6 Y1 W5 p+ n
signal changes layers. As an example of bridging plane splits, a plane split that
. p' m5 f' D3 U8 {; {* a; z/ D! [: Yseparates V5REF and Vcc3.3 planes should have a stitching cap placed near any highspeed3 W' n8 c9 p% o; @: V
signal crossing. One side of the cap should tie to V5REF and the other side# ~0 r% O8 G7 x/ U1 K
should tie to Vcc3.3. Stitching caps provide a high frequency current return path across) _/ U& X0 P F2 H# A( ~
plane splits. They minimize the impedance discontinuity and current loop area that
% z( x6 ~: I" h! |# k$ z' N, Mcrossing a plane split creates., c& v' n/ ^: Q% m
以上是对USB3.0跨moat 的处理, 希望帮到大家 |
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