LMS TxLO noise

Andrey Sviyazov andrey.sviyazov at fairwaves.ru
Wed Jul 25 17:41:58 UTC 2012


Hi Thomas.

Digikey part numbers links:
C82 = 100pF<http://www.digikey.com/product-detail/en/C0603C101J5GACTU/399-1061-1-ND/411336>,
C83=1500pF<http://www.digikey.com/product-detail/en/C0603C152K5RACTU/399-1084-1-ND/411359>,
C84=33pF<http://www.digikey.com/product-detail/en/C0603C330J5GACTU/399-1055-1-ND/411330>,
R106=2.2k<http://www.digikey.com/product-detail/en/RMCF0603JT2K20/RMCF0603JT2K20DKR-ND/1944084>,
R109=3.3k<http://www.digikey.com/product-detail/en/RMCF0603JT3K30/RMCF0603JT3K30CT-ND/1943182>,
L6=0.022uF<http://www.digikey.com/product-detail/en/C0603C223K5RACTU/399-1280-1-ND/416056>
.

But you'll remove 100pF capasitor from position C45, so you could use it
for C82.
BTW, how long time required to delivering from the DigiKey?

Best regards,
Andrey Sviyazov.



2012/7/25 Thomas Tsou <ttsou at vt.edu>

> Hi Andrey,
>
> I will need to order parts. Can you give me a list of digikey part
> numbers for the required components?
>
>   Thomas
>
> On Tue, Jul 24, 2012 at 5:56 PM, 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)
> >
> >
>
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