LMS TxLO noise

Thomas Tsou ttsou at vt.edu
Wed Jul 25 00:47:16 UTC 2012

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 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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