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Clock generation for Sigma-delta ADC / modulator?

 
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kim wan



Joined: 03 Sep 2008
Posts: 4
Post30 Sep 2008 5:43   Clock generation for Sigma-delta ADC / modulator?
Hi Very Happy
I'm making sigma-delta modulator

I have some questions. How can I implement clock generator?


By using ring oscillator ( 5 inverter )
I could make clocks, but it seems unreliable

I heard that clock is very important for sigma-delta modulator

Are there good methods ?


thank you

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JoannesPaulus



Joined: 19 Mar 2008
Posts: 58
Helped: 8
Location: POLAND
Post30 Sep 2008 17:13   Clock generation for Sigma-delta ADC / modulator?
What about a PLL? Yes, the clock is very important!
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jecyhale



Joined: 19 Feb 2008
Posts: 442
Helped: 46
Location: China
Post02 Oct 2008 7:05   Re: Clock generation for Sigma-delta ADC / modulator?
kim wan wrote:
Hi Very Happy
I'm making sigma-delta modulator

I have some questions. How can I implement clock generator?


By using ring oscillator ( 5 inverter )
I could make clocks, but it seems unreliable

I heard that clock is very important for sigma-delta modulator

Are there good methods ?


thank you


If you need a stable clk, you must use crystal and PLL.

If the clk is very low, crystal is enough.
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