LMS TxLO noise
andrey.sviyazov at fairwaves.ru
Wed Jul 25 17:41:58 UTC 2012
Digikey part numbers links:
C82 = 100pF<http://www.digikey.com/product-detail/en/C0603C101J5GACTU/399-1061-1-ND/411336>,
But you'll remove 100pF capasitor from position C45, so you could use it
BTW, how long time required to delivering from the DigiKey?
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?
> 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
> > 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
> > 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?
> >> > > 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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