[time-nuts] GPSDO control loops and correcting quantization error

[GandalfG8 at aol.com]

Hi Don,
 
I don't know if I've misunderstood your question, but as I understand it  
the voltage reference output is a fixed voltage from an internal  regulator 
that can then be used as the supply to an external control  circuit.
For example, it could be used as the feed voltage for a variable resistor  
that has its wiper connected to the EFC input to allow for manual frequency  
adjustment.
When some other form of external control is used, such as a DAC output for  
example, it's not uncommon to find the voltage reference output left  
disconnected and the control circuit fed from an  alternative supply.
 
Regards
 
Nigel
GM8PZR 
 
In a message dated 14/09/2012 23:10:59 GMT Daylight Time, eGunk at wowway.com  
writes:

Hello  all, 

Most voltage controlled XOs have a voltage reference output. Is  it 
necessary for the DAC output / frequency control input, to track this  voltage 
reference output?

Thank You


Don  O'Connor
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