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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: Mostly Jitter Related posted by Dan Banquer on May 17, 2005 at 17:55:46:
[ And all of the above will show up as as some form of distortion in the analog ouput even with a continous sine wave or a low level sweep. ]This is a very optimistic and seemingly ignorant assessment.
To call it distortion is a cop-out, not much of a distinction.
To imply that it will all show up on a spectrum analyzer readily and easily discerned is just plain wrong.With random jitter, and certain forms of signal related (not correlated), operation related and subsystem related jitter, the net effect would be "seen" on a spectrum analyzer as some sort of raised noise floor, which could be a broadband type of 'noise', a 'noise' clustered about the primary tone/s, or specific bands of 'noise'. None of these would be called IM by most people, and it would be hard to categorize them as a signal distortion based on this kind of spectrum analyzer appearance, in fact, unless you already knew what the jitter was going to look like, and knew where to look for it, you could not definitively discern it from "regular noise", or other forms of distortion that also manifested as a 'noise like' spectral content.
DC offset is a form of signal "distortion", but calling it such is more confusing than helpful, and belabors the point of all of this.
IM, THD, etc, you pretty much have a good idea of what it is you are looking for, with jitter, you can not automatically assume that you know what to look for, where, at what level, nor can you be sure (with the CDP output sent straight to a spectrum analyzer), that the spectral components you are calling jitter are indeed due to the presence of jitter, without taking special care to isolate the jitter behavior from the other forms of distortion, such as the Miller Analyzer does, by breaking out the FM components and feeding them to a spectrum analyzer once they have been converted to a frequency domain form of display.
Jon Risch
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Follow Ups
- Re: Mostly Jitter Related - Jon Risch 21:31:17 05/18/05 (3)
- Re: Mostly Jitter Related - Dan Banquer 09:28:04 05/19/05 (2)
- Re: Mostly Jitter Related - Jon Risch 21:21:29 05/19/05 (1)
- You really don't have a clue, do you? - Mudcat 03:58:16 05/20/05 (0)
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