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Alexander Chemeris alexander.chemeris at gmail.comOn Sun, Jul 22, 2012 at 3:11 PM, Srdjan Milenkovic <s.milenkovic at limemicro.com> wrote: > On 21/07/2012 16:28, Alexander Chemeris wrote: >> >> Hi Srdjan, >> >> On Sat, Jul 21, 2012 at 4:33 PM, Srdjan Milenkovic >> <s.milenkovic at limemicro.com> wrote: >>> >>> Hi all, >>> >>> As far as I am aware, you are currently discussing how to improve LMS6002 >>> PLL phase noise. Below are some inputs from my side which may help. >> >> Yes, here are some pictures of phase noise we have at UmTRX right now: >> http://lists.osmocom.org/pipermail/umtrx/2012-July/000030.html >> >> It looks like they're 5-12dB higher then data I saw in your >> temperature measurement report. First thought is that this could be >> due to a clock source. Did you use your EVB board for those >> measurements? > > Yes, we used Lime EVB, 30.72MHz TCXCO. However, using 26MHz instead of > 30.72MHz TCXCO should not affect phase noise so much (5-12dB). Do you have > an alternative 26MHz TCXCO with better PN? As you quite rightly mentioned, > you are probably limited by TCXCO PN at the moment. Could you please share LMS configuration you used during this test, so we could re-create it locally with the EVB we have. A full register dump of the chip would be ideal. -- Regards, Alexander Chemeris. CEO, Fairwaves LLC / ООО УмРадио http://fairwaves.ru