Improving LMS6002 phase noise

Alexander Chemeris Alexander.Chemeris at
Mon Jul 23 20:32:32 UTC 2012

On Tue, Jul 24, 2012 at 12:25 AM, Alexander Chemeris
<Alexander.Chemeris at> wrote:
> Hi Andrey,
> On Mon, Jul 23, 2012 at 10:44 PM, Andrey Sviyazov
> <andrey.sviyazov at> wrote:
>> Today I found why noises and spurs are really happens in UmTRXv1.
> Finally, we could say UmTRX is good at phase noise.
>> 1) Only full disabling (no power) GPS module can kill all near spurs.
> I wonder whether EB-570 is any better. And if EB-570 is no better -
> how could we protect LMS from this noise?
>> 2) To get good noises the next changes are required:
>> - replace choke L6 by capacitor 10nF..0.1uF.
>> - remove C45.
> Is it possible to apply those changes for UmTRXv2 without PCB changes?

PS Please add both points to the tracker, so we don't forget.

Alexander Chemeris.
CEO, Fairwaves LLC / ООО УмРадио

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