[SI-LIST] Re: FW: Power plane / VCC plane as reference for differential
- From: steve weir <weirsp@xxxxxxxxxx>
- To: svel@xxxxxxxxxx, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 20 Aug 2004 16:40:39 -0700
Senthil, if I understand what you propose, it is a very bad idea.
Steve.
At 04:12 PM 8/20/2004 -0700, Senthil Velmurugan wrote:
>Hi Chris,
>
>Thanks for the link on the Uturn current.
>Since Nikki has two VCC power planes. Can we minimize/avoid the effect
>of U-turns by slicing=20
>a portion of reference plane(wedge) just between the diff pairs and
>having decaps for those power plans near the trace and void(GND
>transition caps) this way there is no R-dash +/- currents we see R+/-
>currents from TXr to Rxr. I anticipate R+/- to go from Vccplane1 to GND
>through cap then from GND to VCC plane2.=20
>
>I hope we have enough space between the pair so the individual trace
>impedance is not affected w.r.t to it's reference.
>
>Thanks
>Senthil
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