[time-nuts] Suspected Spam: External clock for Analog toDigital Converter in GPSRx front-end Rx front-end

[Bilal Amin]

Hi Robert,

I need to know the quantity of jitter I am adding to the clock signal. I 
don't think so this idea will work for that ?

Bilal


----- Original Message ----- 
From: "Robert Atkinson" <robert.atkinson at genetix.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Friday, March 02, 2007 7:12 PM
Subject: Re: [time-nuts] Suspected Spam: External clock for Analog toDigital 
Converter in GPSRx front-end Rx front-end


> Bilal,
> How about using one of the "spread-spectrum" microprocessor clock
> generator IC's?
> These add a pseudo-random jitter to the clock signal so the interference
> from the equipment is slightly spread causing the equipment to pass EMC
> testing by causing an apparent reduction in the peak due to the
> bandwidth of the test receiver.
>
> Robert.
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Bilal Amin
> Sent: 02 March 2007 06:35
> To: time-nuts at febo.com
> Subject: Suspected Spam: [time-nuts] External clock for Analog to
> Digital Converter in GPSRx front-end Rx front-end
>
> 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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