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We appreciate your patience as we improve our online experience.
07-15-2014 03:47 PM
Hi, I need to characterize phase and amplitude imbalance of two quadrature signals from a 14bit TxDAC. I selected two 5162 modules to do the job. The signals can have a frequency of up to 1.2GHz..
Is PXIe-5162 capable of doing this job?
The plan was to record a long sample of the signals and then do the processing in ie. Matlab.
I am facing a few problems. Is it possible to synchronize sampling of all channels on one 5162 module, and how to synchronize sampling of 2 x 5162 modules with enough accuracy to have a phase resolution below 1deg?
Are there any examples of how to synchronize sampling of multiple channels/modules in LabView ?
Can the phase and amplitude measurement be done directly in LabView without involving Matlab?
07-17-2014 09:17 AM
Hi Robert,
Did you already read some white paper and KB about synchronization using LabVIEW?
http://www.ni.com/white-paper/11369/en/
http://www.ni.com/white-paper/4322/en/
You can find some other white papers on ni.com. I think this will be a good start before doing something else.
You also can search in the LabVIEW examples.
Here some information about the measurement of the phase and the amplitude:
http://zone.ni.com/reference/en-XX/help/371361H-01/lvanls/amp_and_phase_spectrum/
http://www.ni.com/white-paper/7670/en/
Let me know if it is good 🙂
07-17-2014 02:11 PM
Thanks for a reply.
I read a bit about the NI-TCLK synchronization. Does it apply to module-to-module sunchronization or is it used within one module too?
I found this page
Overcome the Challenges of Building High-Channel-Count, High Speed Measurement Systems
It says 30ps skew after manual calibration, which is not enough for my application.
I didn't find any information about the sampling skew for converters within one module.
I recall a number 12ps from some previous research but I cannot find it now. 12ps within one module is still too much.
07-18-2014 08:25 AM
Hi Robert,
From the datasheet of the 5162 (http://www.ni.com/pdf/manuals/373858d.pdf) page 20, its says that using the manual calibration you can synchronize two identical 5162 with less than 5ps.
Here some other information:
http://www.ni.com/white-paper/3675/en/#toc5
http://www.ni.com/example/31340/en/
Is that answering your questions?
Have a nice weekend.