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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
In this blog we’ll take this one step further and look at driving the ADC power supplies directly from a DC/DC converter.
Previously in this blog series we looked at using a DC/DC converter (switching regulator) in combination with an LDO to drive the power supply inputs to an ADC. What we found was that using the DC/DC converter to step down the input voltage for the LDO was a much more efficient way to drive the power supply inputs to an ADC.
We look at using a DC/DC converter along with an LDO to drive the ADC power supply inputs.
I thought it would be good to continue looking at the example I gave in my last blog where we looked using fewer LDOs and combining power supply rails on an ADC while maintaining isolation with ferrite beads.
There are some disadvantages when driving low input supply voltages, where multiple LDOs may be required.
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