Thanks for the replies. I did not see any LO spectral plots in the AD data sheet only some RMS jitter numbers. The plots posted at https://ez.analog.com/thread/46362 looked interesting but hard to quantify without the resolution bandwidth listed. Regards, Eric Haskell

The older versions of the AD9361 datasheet had plots. I'm not sure why they were removed. I'll try to dig them up. Matt On Fri, Jun 5, 2015 at 9:09 AM, Eric Haskell via USRP-users <usrp-users@lists.ettus.com> wrote: > Thanks for the replies. I did not see any LO spectral plots in the AD data > sheet only some RMS jitter numbers. The plots posted at > https://ez.analog.com/thread/46362 looked interesting but hard to quantify > without the resolution bandwidth listed. > > Regards, > Eric Haskell > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >

On 06/04/2015 08:39 PM, Matt Ettus via USRP-users wrote: > The older versions of the AD9361 datasheet had plots. I'm not sure > why they were removed. I'll try to dig them up. > > Matt I do wonder how any such plots were derived, since there's no external manifestation of the LO as a pin on the chip, unless my eyes glazed over. > > On Fri, Jun 5, 2015 at 9:09 AM, Eric Haskell via USRP-users > <usrp-users@lists.ettus.com> wrote: >> Thanks for the replies. I did not see any LO spectral plots in the AD data >> sheet only some RMS jitter numbers. The plots posted at >> https://ez.analog.com/thread/46362 looked interesting but hard to quantify >> without the resolution bandwidth listed. >> >> Regards, >> Eric Haskell >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

You can measure the phase noise by generating a constant digital signal (DC). The output is then the LO. Alternatively, you input a very clean signal to the RX and postprocess the results. For datasheets, they likely use a wafer probe to probe the LO on die. Matt On Fri, Jun 5, 2015 at 9:45 AM, Marcus D. Leech via USRP-users <usrp-users@lists.ettus.com> wrote: > On 06/04/2015 08:39 PM, Matt Ettus via USRP-users wrote: >> >> The older versions of the AD9361 datasheet had plots. I'm not sure >> why they were removed. I'll try to dig them up. >> >> Matt > > I do wonder how any such plots were derived, since there's no external > manifestation of the LO as a pin on the chip, unless my eyes glazed over. > > >> >> On Fri, Jun 5, 2015 at 9:09 AM, Eric Haskell via USRP-users >> <usrp-users@lists.ettus.com> wrote: >>> >>> Thanks for the replies. I did not see any LO spectral plots in the AD >>> data >>> sheet only some RMS jitter numbers. The plots posted at >>> https://ez.analog.com/thread/46362 looked interesting but hard to >>> quantify >>> without the resolution bandwidth listed. >>> >>> Regards, >>> Eric Haskell >>> >>> _______________________________________________ >>> USRP-users mailing list >>> USRP-users@lists.ettus.com >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com