[SI-LIST] Re: Transmission Line + Jitter
- From: Mike Brown <bmgman@xxxxxxxxxx>
- To: zabinski.patrick@xxxxxxxx
- Date: Fri, 26 Nov 2004 19:30:24 -0600
Patrick,
I believe that you are correct; I ignored thermal noise in my discussion. I
concur with your remarks re deterministic jitter.
Mike
Zabinski, Patrick J. wrote:
> Andy,
>
> I believe the answer is yes; you will see added
> jitter (the real questions are how much, what type,
> and do you care).
>
> Specific to random jitter (which most often
> follows Gaussian distributions), jitter is the result
> of voltage noise on the signal. Accordingly, any
> resistive element (i.e., lossy element) will
> inject some (usually small, inconsequential)
> amount of random noise on the signal, which
> presents itself as random jitter. My understanding
> is that this jitter is usually small enough that
> you don't care, so this is more of a theoretical
> discussion that practical (until we see 100's of
> GHz signals or data being transmitted over very-lossy
> lines).
>
> Specific to deterministic jitter, the discussion
> needs to be specific to the type of signal
> you're passing through it. In brief, transmission
> line losses are frequency dependent, which will
> shifts data transitions (i.e., rising and falling
> edges) differently depending upon the frequency
> content of the edge.
>
> If the signal is a clock that is exactly
> repetative (i.e., same exact duty cycle
> throughout with no change in phase, frequency,
> etc.), then the effective frequency content of
> each pulse is the same. Accordingly, each
> transition will be delayed by the same amount.
> As a result, you will not see any added
> deterministic jitter.
>
> If the signal is a data pattern where the pulses
> changes in width, then the effective frequency
> content of each pulse will vary, which in turn
> will shift the edges by varying amounts, which will
> manifest itself as deterministic jitter (i.e.,
> data dependent jitter, or intersymbol interference).
> Depending upon several factors, this type of
> jitter can be significant.
>
> Pat
>
>
>
>>-----Original Message-----
>>From: Andy Kuo [mailto:andyk@xxxxxxxxxx]
>>Sent: Thursday, November 25, 2004 7:57 PM
>>To: si-list@xxxxxxxxxxxxx
>>Subject: [SI-LIST] Transmission Line + Jitter
>>
>>
>>Hi All,
>>
>>I have a basic question to ask:
>>
>>Assuming I have one single transmission line and it is
>>perfectly matched
>>and properly terminated. This transmission line is lossy. I
>>am applying
>>a square signal through the transmission line
>>
>>Will I see any jitter in the edge crossing?
>>
>>Regards,
>>Andy
>>
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