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The Designer's Guide Community Forum › Design › Analog Design › 3rd harmonic distortion cause in sigma delta adc
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3rd harmonic distortion cause in sigma delta adc (Read 2781 times)
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3rd harmonic distortion cause in sigma delta adc
May 19th, 2008, 12:30am  
Hi:

  I am simulating a 2nd order sigma delta modulator. it is a cascade switch capacitor  structure.  

but the slow corner has too high 3rd harmonic = 60dB.

I want to know what cause the 3rd harmonic too high?

thanks
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filipe
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Re: 3rd harmonic distortion cause in sigma delta a
Reply #1 - May 20th, 2008, 4:33am  
Hi,
The first step is verify the specs of your ampop and switch, under corners. The non-linearity of the switches and the non-linearity of the ampop can cause harmonic distortion.
Filipe
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chungming
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Re: 3rd harmonic distortion cause in sigma delta a
Reply #2 - May 22nd, 2008, 11:36pm  
you should check your output of integrator which is saturated.
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