Use my design tool

LMX2541_Prog.exe  contained in  http://g4jnt.com/LMX2541Support.zip

It can be used just to get the register values without having to use the RS232 interface.

Andy

www.g4jnt.com

On Sat, 11 May 2019 at 21:10, Richard <richard@...> wrote:

OK Andy

I just tried hard to get the ref divider down , but TI tool didn't want to play except with 2.5 and 2 MHz, I'll have another play and see if I can move the ref freq up

Richard

On Sat, 2019-05-11 at 21:03 +0100, Andy G4JNT wrote:

Close-in phase noise is purely a function of the reference.   Only when you get outside the loop bandwidth does the PLL chip come into the equation

In both you should be using Fcomp thd maximum you can - probably 10MHz, and a loop bandwidth in the 10 - 30kHz region

Andy

www.g4jnt.com

On Sat, 11 May 2019 at 20:56, Richard <richard@...> wrote:

Which in practice has the better close in phase noise
 Fvco =3321MHz, Fout =1660.5 Fref-10MHz  phase comp freq 2.5MHz
I'd forgotten I have quite a few that I got as samples, and one of
Andy's boards from a few moons ago

-- 

 Best wishes /73 

 Richard Bown

 

 Email : richard@...

 HTTP  :  http://www.g8jvm.com

 

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