LMS TxLO noise

Andrey Sviyazov andrey.sviyazov at fairwaves.ru
Wed Jul 25 05:01:52 UTC 2012


Alexander, I already explained it in preview mail.

Best regards,
Andrey Sviyazov.
(Sent from my mobile client)
25.07.2012 8:47 пользователь "Alexander Chemeris" <
alexander.chemeris at gmail.com> написал:

> Hi Andrey,
>
> Could you also describe to Thomas and Sylvain what to do with C45 and
> L6? I guess that's a required step before they do any other
> measurements.
>
> And please, add this issue to the issue tracker.
>
> On Wed, Jul 25, 2012 at 1:56 AM, Andrey Sviyazov
> <andrey.sviyazov at fairwaves.ru> wrote:
> > Hi Thomas.
> >
> > Could you please make test again for LO integral phase noise and
> modulation
> > accuracy with PLL loop filter 100kHz and ICP=0.4mA (or above), as Srdjan
> > suggested us.
> > I've assembled 100kHz loop filter with the next components:
> > C82 = 100pF, C83=1500pF, C84=33pF, R106=2.2k, R109=3.3k.
> > To get good noises replace choke L6 by capacitor 10nF..22nF and remove
> C45.
> >
> > I ask you because I have to send final BOM as soon as possible to avoid
> > delay of UmTRXv2 production due to changes for improvements.
> >
> > Best regards,
> > Andrey Sviyazov.
> > P.S. Pictures attached just to be sure.
> >
> >
> > 2012/7/23 Andrey Sviyazov <andrey.sviyazov at fairwaves.ru>
> >>
> >>
> >> > > Perhaps this is a silly question, but how do I calibrate the clock?
> or
> >> > > use an external reference signal?
> >> >
> >> > Andrey Sviyazov - does ClockIn works as external input in UmTRXv1?
> >>
> >> Yes, 5V cmos level required or smaller with DC offset to get 2.5V
> >> symmetry.
> >> Turn switches to MHz and slave positions.
> >>
> >> Best regards,
> >> Andrey Sviyazov.
> >> (Sent from my mobile client)
> >
> >
>
>
>
> --
> Regards,
> Alexander Chemeris.
> CEO, Fairwaves LLC / ООО УмРадио
> http://fairwaves.ru
>
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