[SI-LIST] Re: Transmission Line + Jitter

The question posed, if I read it correctly, involves the application of a 
square wave (assuming 50% duty cycle) through a lossy line.

In this case, the HF loss will not cause jitter, because the spectrum of the 
input signal vs. time is constant.  The HF loss effects each transition 
equally.  If the duty cycle of the waveform is changing, as in a data signal, 
then the spectrum as a function of time is not constant and the HF loss will 
effect some edges more than others, causing jitter.

The HF loss on a square wave will impact the edge rate at the receiver, opening 
the door for noise to shift the threshold crossing time, which also produces 
jitter.  

If the discussion is limited to the line with the square wave input, no jitter 
is introduced.

Regards

Mike

Jia Gongxian wrote:

> Andy,
> 
> Since the trace is lossy, it will cause high freqency component of the signal 
> attenuation, thus causes the jitter occur in the edge crossing , which is 
> related to the rise time, length of the trace and material property, etc.
> 
> Regards.
> 
> Jia Gongxian
> Huawei Technologies Co.,Ltd.
> Email:   jgxian@xxxxxxxxxx
> website: http://www.huawei.com
> 
> ----- Original Message ----- 
> From: "Andy Kuo" <andyk@xxxxxxxxxx>
> To: <si-list@xxxxxxxxxxxxx>
> Sent: Friday, November 26, 2004 9:56 AM
> 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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