Hi Since this is Time Nuts … crazy isn’t always ruled out :)
> ………. > “TSP #162 Tutorial on Theory, Characterization & Measurement > Techniques of Phase Noise" > > https://www.youtube.com/watch?v=SOHjFtw0sgo > > each 5db of improvement requires an order of magnitude increase in > the number of correlations. > > dB 5 10 15 20 25 30 35 40 > N 10 100 1000 1E4 1E5 1E6 1e7 1e8 > > So going from -180dBc/Hz to 220dBc/Hz would require 1e8 correlations. > > 6. Nobody would wait that long. But how many correlations do you need? > …….. Say you did go the brute force approach. We’re talking far removed phase noise for stuff like -220 dbc/Hz so each sample set could be pretty short. Just to toss out a number, let’s go with 1 ms. Yes, this would be quite far from carrier. We now are at 1x10^5 seconds of data. That’s “only” a bit over a day. That’s not an insane run time for an R&D environment. An “over the weekend” run of three days would get you all the way out to 3 ms sample sets. Want longer samples? How many samplers / correlation processors do you have? How much does each one add to the mix? If it was linear, you are out to a whopping 300 ms with “only” 100 processors. Yes that sounds insane. This isn’t quite as simple as a video graphics card or four being plugged into a PC. Still, it could cut down the time. So maybe not quite so crazy after all ….. Bob _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
