[SI-LIST] Re: LVDS differential crosstalk question
- From: Leonard Dieguez <Leonard.Dieguez@xxxxxxxxxx>
- To: bill_hargin@xxxxxxxxxxx
- Date: Tue, 22 Mar 2005 19:32:04 -0800
Bill is there a way to model a transformer in HyperLynx ? (no spice)
lwd
"Hargin, Bill" wrote:
> Hi Ma:
>
> Certainly, there are design rules that you can follow, but - if you want
> to find out exactly how close you can space these lines - I'd recommend
> simulating this. Who's to say - with the right stackup to spacing ratio
> - that you couldn't narrow the spacing considerably? (Again, you'd want
> to simulate to find out.)
>
> It's not the only tool on the market for this, but HyperLynx LineSim
> would handle this problem in about 15 minutes once you have the
> appropriate IBIS models. (There's a crosstalk example in the online
> tutorial on www.mentor.com/hyperlynx.) By the sounds of the tradeoffs
> you're making (significant bearing on manufacturing costs), I'd say that
> the software would pay for itself pretty quick.
>
> With apologies for the shameless plug, this type of problem is a
> slam-dunk for a good SI simulator.
>
> If you send me your stackup, the IBIS models, and your noise target
> (offline), I can fire back an answer.
>
> Bill Hargin
> Product Manager - HyperLynx
> Mentor Graphics Corp.
> 425-497-5079 - Direct
>
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx=20
> > [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of steve weir
> > Sent: Tuesday, March 22, 2005 5:38 PM
> > To: sitaskina@xxxxxxxxx; si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Re: LVDS differential crosstalk question
> >=20
> > Ma, if you are running LVDS near a CMOS aggressor, you will=20
> > want 10H or better separation from the two.
> >=20
> > Steve
> > At 04:47 PM 3/22/2005 -0800, ma mu wrote:
> > >Hi all,
> > >
> > >I have a question about LVDS signal routing. In my board I have both=20
> > >high speed signals and LVDS signals.
> > >high speed differential signals pair to pair separation is=20
> > 80 mil. and=20
> > >the requirement of LVDS signal separation is same. but I=20
> > don't have 80=20
> > >mil space for routing, so I am thinking that I will use 40 mil=20
> > >seperation.I am not sure that I could do that.
> > >will crosstalk be a problem? could any one recommend me what=20
> > I should=20
> > >do instead of increasing the layer count. Thanks.
> > >
> > >ma
> > >
> > >
> > >
> > >
> > >
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