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

Dr Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri Mar 2 02:10:54 EST 2007


Bilal Amin wrote:
> Hi Everyone,
>
> I am working on Jitter in Analog to Digital Converters(ADCs) for GPS receiver front-end. I am trying to setup an experiment to see the effects of jitter in real time ADCs. I have an ADC evaluation board with external clock input for sampling (i.e Sampling clock). Now I want to produce a self created jittery signal to see the effects of jitter in ADC. Can anyone out there have any idea(s) how I can produce a real time clock signal with "variable jitter" for the input of external clock? Producing a simple clock signal (i.e. without jitter) is straight forward with the help of any signal generator but a clock signal with "variable jitter" is a problem. 
>
> Thanks for your help.
>
> Cheers
>
> Bilal
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>   
Bilal

All you have to do is add sufficient noise to a sinewave clock.
The clock shaping circuitry will then convert the noise to timing jitter 
at the zero crossings.
All you need is a suitable source of wideband noise.

Bruce



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