[Premium-Rx] Clean LOs

[Carcia, Francis A HS]

Oleg,
I have to say this is the coolest project I have seen in QEX. You did a
beautiful job!  I have only 1 comment. Why didn't you consider a clock
driver at the output of U2A pin 3 running at a higher voltage?  fc
-----Original Message-----
From: Oleg Skydan [mailto:skidan at mail.ints.net]
Sent: Friday, February 18, 2005 1:15 AM
To: premium-rx at ml.skirrow.org
Subject: Re: [Premium-Rx] Clean LOs


Hi, All !
 I believe that the main problem with the RA6830 synthesizer is that it does
not use enough bits for the D to A in the fractional N loop coupled with
very poor ground loops in the 60 Hz supply. 
 
The modern all digital fractional-N technique DOES NOT use D/A at all. 
See the patent US 4,609,881.
 
I tried this tecnology (for the LO in my transceiver) and was very satisfied

with a very simple design (here is my article from the QEX):
http://users.ints.net/skidan/T03DSP/Download/F-N_Synth.tif
<http://users.ints.net/skidan/T03DSP/Download/F-N_Synth.tif> 
 
All the best !
Oleg UR3IQO
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