Hi Karl, >> Thanks in advance to anyone whose interest is piqued enough to respond.
My interest in piqued ... I'm in the process of measuring phase noise using a Rhode&Swartz on some EVMs and custom designs: 1. Texas Instruments DAC39RF10 DAC (I have rev1 and rev2 of their space parts) 2. Texas Instruments ADC12DJ3200 ADC (QMLV part) 3. LMX2615-SP synthesizer 4. LMK04832-SP clock distribution 5. Wenzel low-phase-noise 108MHz and 2700MHz reference (5400MHz and 10800MHz also options) 6. Keysight N5183B synthesizer The DAC and ADC are JESD204C devices. The application is radars (space-based). The ADC EVM plugs into the FMC site on a KCU105, so could fill the DDR on that. I'm playing with these toys to determine what we don't link. So far the LMX device is the weakest-link (largest source of phase noise). My original plan had been to take 108MHz to make 5400MHz for the DAC, 2700MHz for the ADC, and 168.75MHz for the FPGA REFCLK/CORE clock. But the phase noise of the LMX may change my mind to bring the 5400MHz directly from the Wenzel. The Wenzel phase noise is nicer as they use doubler to get to higher frequency rather than a PLL. So my "toys" might just have the low-phase-noise and higher-phase-noise that you are looking for to provide your algorithms. We would have the Rhode&Swartz analyzer for comparison. Regards, Dave Dr David Hawkins Technical Group Supervisor Radar Science & Engineering Section Radar Digital Systems Group (334B) Jet Propulsion Laboratory 4800 Oak Grove Dr Pasadena, CA 91109 Office: 300-235R Phone: 818-354-2252 Cell: 626-720-7079 https://radar.jpl.nasa.gov/ -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Karl Warnick Sent: Tuesday, August 20, 2024 1:38 PM To: [email protected] Subject: [EXTERNAL] [casper] Low cost phase noise analysis Hi all, I've spent some time this summer as part of a radar project digging into calculating phase noise for highly stable tones. I have implemented what I think is a decent algorithm. My next steps are to look for test data sets and tips for the hardware. Do you have a file of samples of a stable tone? If anyone has a test data set consisting of samples of a pure tone that they would like to share as a test data set, I'd like to apply my codes to that and check the phase noise. Both the tone generator and the ADC sample clock should be phase stable to the order of a Keysight signal generator, or ideally better. The data set length should be a reasonable fraction of a second for ~1 Hz phase noise resolution. The frequency of the tone and the sample rate are fairly arbitrary as I'm mainly looking to benchmark the algorithm. How cheaply can stable samples be acquired? I'm looking for low cost hardware (a few $100s up to a few $k) that is stable enough to measure phase noise comparable to a Keysight source or better. Phase noise can be measured with an expensive phase noise analyzer, but I believe it should be possible to do this with a low cost digitizer with a suitably stable sample clock. The sample clock could (or perhaps must) be external. The sample rate should be around 80-100 Msps or higher and the platform should be able to store a burst of samples of length on the order of 1 sec. We have done this using a ZCU 216 and it seems to work, but that isn't really a low cost board. I've looked into Picoscope products, which might be ideal, but their support people don't know anything about the phase noise properties of their samplers. Thanks in advance to anyone whose interest is piqued enough to respond. Best, Karl -- Karl F. Warnick Parkinson Engineering Research Professor Department of Electrical and Computer Engineering Brigham Young University 450 Engineering Building Provo, UT 84602 (801) 422-1732 -- You received this message because you are subscribed to the Google Groups "[email protected]" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://urldefense.us/v3/__https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/8839ddb3-83fd-40be-8a9d-c90ae6f9678e*40ee.byu.edu__;JQ!!PvBDto6Hs4WbVuu7!IFnYEgqQe8kaUng5-GO2j0vTgHyNtice7rx_XjIuR7rWtWeNMZcYoJhwWtGc0Qx3yHO7sl-thzvxxciKVtKfHpPJjgOa6w$ . -- You received this message because you are subscribed to the Google Groups "[email protected]" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/DM6PR09MB5157CF111BCF084D01498837878D2%40DM6PR09MB5157.namprd09.prod.outlook.com.
