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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> 3rd harmonic distortion cause in sigma delta adc https://designers-guide.org/forum/YaBB.pl?num=1211182208 Message started by min on May 19th, 2008, 12:30am |
Title: 3rd harmonic distortion cause in sigma delta adc Post by min on 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 |
Title: Re: 3rd harmonic distortion cause in sigma delta a Post by filipe on 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 |
Title: Re: 3rd harmonic distortion cause in sigma delta a Post by chungming on May 22nd, 2008, 11:36pm you should check your output of integrator which is saturated. |
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