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Jonathan Harris

Interleaving Spurs: The Mathmatics of Timing Mismatch

Jonathan Harris
markgrogan
markgrogan
8/8/2018 9:31:05 AM
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Newbie
Re: Re : Interleaving Spurs: The Mathmatics of Timing Mismatch
Someone needs to come up with some sort of system online that helps us with all the hard math so we can all get back down to the engineering of things. I'm actually pretty sure somewhere on the vast interwebs that there may such a system in there, The trouble will probably be coming up with the formula that governs what we're trying to do eh?

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jonharris0
jonharris0
10/28/2013 8:44:27 AM
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Blogger
Re: Re : Interleaving Spurs: The Mathmatics of Timing Mismatch
Thanks for the comments yalanand.  You are correct, probably the simplest interleaving mismatch to look at is the offset mismatch.  I've discussed that here http://www.planetanalog.com/author.asp?section_id=3041&doc_id=560484 and here http://www.planetanalog.com/author.asp?section_id=3041&doc_id=561191

Definitely appreciate all these comments from everyone, please keep them coming! :-)

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yalanand
yalanand
10/27/2013 7:14:26 AM
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Master
Re : Interleaving Spurs: The Mathmatics of Timing Mismatch
Probably the calmest of these to realize is the offset disparity between the two ADCs.  Each ADC would have a related DC offset value. When the two ADCs are enclosed and samples are learned alternatively back and forth among the two ADCs, the DC offset of each consecutive sample is altering. 

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jonharris0
jonharris0
10/18/2013 8:20:35 AM
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Blogger
Re: Timing
Hi Sunita, thanks for the comment. You are correct, typically SFDR is defined by the fundamenatl and the most prominent harmonic. In the case of the interleaved ADC, with enough mismatch, the interleaving spur can be significantly higher than the highest harmonic.  In this case, it drives what the actual SFDR is since the dynamic range is then typically limited by the amplitude of the interleaving spur.

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samicksha
samicksha
10/10/2013 6:22:57 AM
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Artist
Timing
Mathematics has always been a nightmare for, but if we refer SFDR it is between the amplitude of the frequency being generated and the amplitude of the most prominent harmonic.

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