what is the spread-spectrum clock generator

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Hi,

I read in a text book "Use spread-spectrum clock generator to spread the first harmonic over a wider frequency range and decrease the radiated energy within the bandwidth of the FCC test.". Any example of spread-spectrum clock generator that can have first harmonic over a wider frequency range ?
 

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Try this:
1) Buy a computer
2) Turn it on
3) Search “spread spectrum clock generator”
4) Read the 14000000 results.
 

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A question to ask yourself is whether playing with "decrease
the radiated energy within the bandwidth of the FCC test"
is going to solve any problem. It's more of a "points shaving"
play, than a "touchdown pass" and it's about compliance to
a spec without actually changing the amout of RFI emitted.

"All you need" is more pull-range on whatever is spreading
the oscillator.
 

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Yes, a spread-spectrum clock generation is an efficient way to reduce EMI. How do we relate clock from crystals and crystal oscillators ? Are these clocks from crystals and crystal oscillators generated to reduce EMII and using spread-spectrum techniques ?
 

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Regular crystal oscillators never implement spread spectrum clocking, only special clock oscillator components.

There are many applications that don't allow for spread spectrum clocking.
 
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