[time-nuts] External clock for Analog to Digital Converter inGPS Rx front-end

[Arnold Tibus]

Thanks Bruce, 
'it generates poses some interesting challenges' 
sounds interesting, could you give some little details 
to get better idea of it?
many thanks,

Arnold, DK2WT



On Sun, 04 Mar 2007 10:29:48 +1300, Dr Bruce Griffiths wrote:

>Arnold Tibus wrote:
>> Hi,
>> HP was using in their 500MHz counter 5345A a noise generator 
>> (zener diode with amplifier on PC board 'A8 PLL Multiplier Noise Generator 
>> board') to modulate via a varactor and a tank circuit the 10 MHz 
>> reference frequency coming from the ocxo 10811A. 
>> "4-126, As the erratic changes in noise affect CR12's capacitance, the 
>> phase of the 10 MHz signal shifts rapidly. The result ia a 500 MHz time base 
>> signal that is phase modulated so rapidly and erratically that it cannot be 
>> harmonically related to any input signal."
>> Intersting technique, easy to follow.
>> Is that what was searched, would such a circuit help? 
>> The manual is freely available via the net as .pdf. 
>> Perhaps that board, cannibalized from an old counter, could be used...
>> I think it is necessary for TIC to get statistically correct intermediate 
>> counts.
>>
>> cheers,
>> Arnold, DK2WT
>>
>>   
>Arnold

>Circuit is fine for the application it was designed for.
>However for measurement purposes accurately calibrating the phase noise 
>spectrum it generates poses some interesting challenges.

>Bruce

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