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With a 2-bits, 500Msps ADC, I found that the amplitude of the second harmonic is bigger than the amplitude of the fundamental by analysizing the FFT result of samping data. Why?

Prodigy 30 points

Replies: 2

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As I mentioned in the title, I am wondering the reason. Additionally, I analysed the sampling data from 10 MHz to 160MHz and found that the same law as mentioned in the title.

Thanks.

2 Replies

  • u4,

    What is the ADC you are using?  TI does not have any 2-bit ADCs, the fewest number of bits at 500Mbps is 7-bits.

    You can use the ADC harmonic calculator to determine the Harmonic content: www.ti.com/tool/ADC-HARMONIC-CALC .

    ~Leonard

     

  • In reply to LeonardEllis:

    Thank you. The ADC vendor is not TI. I just ask a question.

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