[time-nuts] FE 5680A "new version" - Filtering the 10 MHz

EWKehren at aol.com EWKehren at aol.com
Tue Nov 15 23:43:03 EST 2011

The DDs is part of the Rb loop, the PLD divides by 3 and 2, the 10 MHz is a 
 direct function of the XTAL. I am sure the PLD also has other functions. 
Older  models had a 50.255 XTAL with a DDS on the output, I think the change 
occurred  some time between 2000 and 2002.
Bert Kehren
In a message dated 11/15/2011 8:02:57 P.M. Eastern Standard Time,  
albertson.chris at gmail.com writes:

On Tue,  Nov 15, 2011 at 4:25 PM, beale <beale at bealecorner.com> wrote:
>  Sylvain Munaut wrote:
>> It's not generated from a DDS. It's from a  xilinx PLD,

I think the DDS is implemented inside the PLD.

Sying  "that is not a DDS, it's a PLD, is like saying "That is not an
amplifier,  it is a transistor."

In the description of how the device works in the  data sheet they say
there is a DDS inside the programmable  synthesizer.   It seems
reasonable that several functions are  implemented inside the PLD and
this seems to be supported by the data  sheet.

Chris Albertson
Redondo Beach,  California

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