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  1. #1
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    Power spectral density of flash ADC

    hi
    in artcle"High-Speed Low-Power Flash ADC Architecture Using
    Switched-Capacitor Positive Feedback Comparator and
    Parallel Single-Gate Encoder
    Saleh Abdel-Hafeez1 · Ali Shatnawi--DOI 10.1007/s00034-017-0673-8"

    i have some question that hope anyone answer to me.
    1) with notation to image wave_form(attached image) what software the authors have used to draw wave forms? the authors have used hspice to simulation.
    2) with notation to power_spectral_density image (attached) how has been calculated snr from power spectral density plot? explenation that in this plot, power spectral density of digital output of a flash adc was plotted.
    3) if fft plot of output is the same as power spectral density of output?
    thanksClick image for larger version. 

Name:	wave_form.PNG 
Views:	5 
Size:	163.9 KB 
ID:	150805Click image for larger version. 

Name:	power_spectral_density1.png 
Views:	6 
Size:	72.6 KB 
ID:	150804

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  2. #2
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    Re: Power spectral density of flash ADC

    Quote Originally Posted by akbarza View Post
    hi
    in artcle"High-Speed Low-Power Flash ADC Architecture Using
    Switched-Capacitor Positive Feedback Comparator and
    Parallel Single-Gate Encoder
    Saleh Abdel-Hafeez1 · Ali Shatnawi--DOI 10.1007/s00034-017-0673-8"

    i have some question that hope anyone answer to me.
    1) with notation to image wave_form(attached image) what software the authors have used to draw wave forms? the authors have used hspice to simulation.
    2) with notation to power_spectral_density image (attached) how has been calculated snr from power spectral density plot? explenation that in this plot, power spectral density of digital output of a flash adc was plotted.
    3) if fft plot of output is the same as power spectral density of output?
    thanksClick image for larger version. 

Name:	wave_form.PNG 
Views:	5 
Size:	163.9 KB 
ID:	150805Click image for larger version. 

Name:	power_spectral_density1.png 
Views:	6 
Size:	72.6 KB 
ID:	150804

    I can answer your last question (3): The power spectral density is the modulus of the FFT squared i.e magnitude squared, with no phase information


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