Home    Bloggers    Blogs    Article Archives    Messages    About Us   
Tw  |  Fb  |  In  |  Rss
Jonathan Harris

Interleaving Spurs: The Mathmatics of Timing Mismatch

Jonathan Harris
jonharris0
jonharris0
10/28/2013 8:44:27 AM
User Rank
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! :-)

50%
50%
yalanand
yalanand
10/27/2013 7:14:26 AM
User Rank
Newbie
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. 

50%
50%
jonharris0
jonharris0
10/18/2013 8:20:35 AM
User Rank
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.

50%
50%
samicksha
samicksha
10/10/2013 6:22:57 AM
User Rank
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.

50%
50%
More Blogs from Jonathan Harris
In this installment of this series Iíll explain how to collect load regulation for an LDO.
A device going into space must be much more rigorously evaluated than a device going into a commercial product. Hence the need to do a good deal more characterization and Ďproving outí of the device to make sure that it will endure the harsh environment in space as well as the long lifetimes required.
As somewhat of a continuation of my last blog topic I am once again returning to measurement of an LDO parameter as I look at the power supply rejection ratio (PSRR) of this device
Characterize the noise spectral density (NSD) of an LDO, otherwise known as a low dropout voltage regulator.
Now that weíve had a chance to learn a bit about the tool we will take a look at using Virtual Eval to predict the performance of the AD9680-500 which has integrated digital downconverters (DDCs) and will compare simulated data to measured data.
flash poll
educational resources
 
follow Planet Analog on Twitter
Planet Analog Twitter Feed
like us on facebook
our partners
Planet Analog
About Us     Contact Us     Help     Register     Twitter     Facebook     RSS