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Jonathan Harris

More Thoughts on Interleaved ADCs

Jonathan Harris
jonharris0
jonharris0
8/1/2013 4:31:21 PM
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Re: Re : More Thoughts on Interleaved ADCs
Thanks for the link, SunitaT.  It looks like an interesting read.  Keep your eyes out as I hope to make it onto the subject of calibration soon.  First though, I'll finish up discussing the various mismatches.

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SunitaT0
SunitaT0
7/31/2013 3:08:29 AM
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Re : More Thoughts on Interleaved ADCs
Time interleaving can relax the speed-power trade-off of analog-to-digital converters but at the cost of sensitivity to inter-channel mismatches. I found this paper from ulca very useful.

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jonharris0
jonharris0
7/8/2013 1:37:48 PM
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Re: Asynchronous Time Interleaving by Tektronix
Hi Frank, quite an interesting read there.  I hadn't thought of interleaving in such a fashion.  I think mostly of time interleaving.  I can tell the paper is at a pretty high level and only skims the surface of what is really going on.  I did notice they were a bit vague on the detials of the ADC.  There is mention at one point along the lines of "The resulting data from the pre-sampler could then be sampled by the ADC at a rate independent from the pre-sampler, such as 100GS/s."  I am not aware of any 100GS/s ADCs out there though...all in all though, it is an interesting read for sure.  Thanks for the comment and the link.

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Frank Wiedmann
Frank Wiedmann
7/4/2013 4:14:47 AM
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Asynchronous Time Interleaving by Tektronix
Jonathan, do you have any comments on the Asynchronous Time Interleaving presented by Tektronix in the paper available from http://www.tek.com/document/whitepaper/techniques-extending-real-time-oscilloscope-bandwidth ?

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jonharris0
jonharris0
7/1/2013 3:49:51 PM
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Re: Interleaved ADCs
@Maciel Thanks for the comments.  Indeed there are some things to consider when interleaving such as the spur products that are produced....but that is coming soon in my next blog...

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Maciel
Maciel
6/27/2013 7:22:43 PM
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Interleaved ADCs
I've had some problems when using converters ADCs, but with the advancement of the uC is difficult to justify the use of them, except for equipment that require specific methods of acquiring signals differently.

The Texas instruments wrote a good article giving tips for using converters ADCs that are faster, worth checking out ...

 

http://www.ti.com/lit/wp/snaa111/snaa111.pdf

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More Blogs from Jonathan Harris
We will continue looking at the AD9680 as an example just as we did in part 1. Similar to the real mode operation of the DDC the normalized decimation filter responses are the same regardless of speed grade.
Let’s now take a closer look at the decimation filtering and how ADC aliasing influences the effective response of the decimation filtering
Increase the decimation ratio in the DDC to see the effects of frequency folding and translating when a higher decimation rate is employed along with frequency tuning with the NCO.
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Back in my April blog post this year, we took some time to look at the Frequency Folding Tool that is available on the Analog Devices web site. I would like to revisit this tool as there have been a few handy improvements that have been made based on some great feedback.
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