[SI-LIST] Re: Single ended Noise OR Differential Noise

  • From: Naresh Dhamija <naresh.dhamija@xxxxxxxxxxxxx>
  • To: weirsi@xxxxxxxxxx, si-list@xxxxxxxxxxxxx
  • Date: Wed, 8 Oct 2014 11:57:22 +0530

Steve.

You are right, I saw that Noise and Jitter on output of IO  gets minimized
when I see the output of IO w.r.t same noisy reference vss. But it only gets
minimized but not completely gone. Is it because of the finite routing
delays of vddio,vss and signal within the IO and also signal delay is not
the same as the supply delays. Is my understanding correct.

Naresh

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of steve weir
Sent: Wednesday, October 08, 2014 12:45 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Single ended Noise OR Differential Noise

All voltage noise between a single-ended transmitter and receiver causes
jitter.  Single ended jitter is minimized by:  Launching against a single
reference, propagating the transmit energy against that same reference, and
tightly coupling the receiver threshold voltage to that same reference.

Steve.

On 10/7/2014 6:10 AM, Naresh Dhamija wrote:
> Hi folks,
>
> I am doing power noise analysis on a system that uses SSTL IO buffers.
> I am seeing the ripple on the IO output signal - such that during hi
> state IO output signal follows the noise whatever is on the vddio and
> during low state, IO output signal follows the noise on the vss.
> Observing this phenomenon, I purposely forced IN PHASE single ended
> noise  to both vdddio and vss of almost the same frequency as of data
> rate but uncorrelated with data rate. Since noise forced to vddio and
> vss are IN PHASE so Differential Noise measured between vddio and vss
> at each instant shows zero noise. But still I see jitter on the edges
> because of finite rise and fall times, the initial low level and final
> high level for a transition from low to hi are not always same. Does
> this mean that along with differential noise, single ended noise on
> power and ground also cause jitter to IO driver.
>
> Regards
> Naresh
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