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bergnoli.infn
Newbie
Newbie
438 Views
Registered: ‎03-14-2019

mmcm or pll fine frequency tuner

Is it possible to obtain a fine frequency shift of a mmcm or pll output. i.e:

Fin = 100 Mhz

Fout = 100 Mhz + or - 30 ppm?

 

Thanks

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lowearthorbit
Scholar
Scholar
430 Views
Registered: ‎09-17-2018

Not that I am aware of,

The way I have done this in the past is to use a direct digital frequency synthesizer (DDFS) asa numerically controlled oscilator (NCO).  One DSP48 may be used which will give you frequency control (lsb) of 3.5E-15.  In effect, the adjustment will appear continuous.

l.e.o.

 

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