[SI-LIST] Re: Need help understanding Stateye analysis
- From: Dan <signal.integrity2@xxxxxxxxx>
- To: joel@xxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 21 May 2012 16:41:04 -0700
HI Joel,
if yousee the amplitude in the eye diagram, the peak will be +/-X/2, if X
is your peak volatge. the reason is i think HSPICE wants to do the stateye
analysis with zero as the center line.
on the input source, i faced the same issue. with a LFSR input pattern, the
eye seems to be opened and with a random source it is kind of closed. i
believe with a LFSR source stateye is considering onlly few patterns and
not millions of patterns repeating.
Experts please comment
Regards
Dan.
On Mon, May 14, 2012 at 12:44 PM, Joel Brown <joel@xxxxxxxxxx> wrote:
> Correction:
> The resulting eye diagrams look roughly the same with some important
> differences.
> The amplitude of the stateye is one half the amplitude of the transient.
> Also the rise / fall time of the stateye is TWICE that of the transient.
>
>
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