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

Bilal Amin bilal_amin at hotmail.com
Fri Mar 2 18:04:19 EST 2007


----- Original Message ----- 
From: "Dr Bruce Griffiths" <bruce.griffiths at xtra.co.nz>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Friday, March 02, 2007 6:10 PM
Subject: Re: [time-nuts] External clock for Analog to Digital Converter in 
GPS Rx front-end


> 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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Hi Bruce,

Thanks for your email.Adding noise to a sine wave is not that straight 
forward I guess. Do you think a comparator works for this? 




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