Youtor
ADC parameters DNL and INL Differential and Integral Nonlinearity in ADC
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http://youtube.com/watch?v=TTO35V3XgiU
In this video, the different non-linearities in ADC like DNL and INL (Differential and Integral non-linearities) have been explained. • By watching this video, you will learn the following topics: • 0:00 Introduction • 0:20 Quick recap of the previous video • 2:05 Differential Non-linearity (DNL) in ADC • 4:33 Missing Code in ADC • 6:21 Integral Non-linearity (INL) in ADC • What is DNL and INL ? • DNL: DNL or differential non-linearity is the maximum and minimum change in the step width of the actual and the perfect transfer function. • For the perfect ADC, the step width of each step is 1 LSB. But due to the non-linearity, the step width may vary. • DNL for each step = Actual Step width - Pefact Step width • To avoid the missing code, the DNL for any ADC should be less than ± 1LSB. • INL: • INL or integral non-linearity is the integral of all the DNLs in the transfer function. • It shows how the actual transfer curve deviates from the perfect transfer curve. • At any given point in the ADC, the INL is the accumulation of all the DNLs up to the point. • The shape of the INL curve depends on the distribution of the DNL. • The INL is measured in reference to the straight line. • And there are a couple of methods to draw this straight line. • 1) End Point method: • In this method, the straight line passes through the two endpoints of the actual transfer curve. It gives the maximum possible INL for the given ADC and useful for precision measurements. • 2) Best Fit method: • In this method, the best fitted straight line which closely resembles the actual curve is drawn and with respect to that line, the INL is measured. • When INL is measured using this method, it turns out to be less than the end-point method. • The link to other useful videos related to ADC and DAC • • 1) ADC gain error and offset error • • ADC : Offset Error and Gain Error Exp... • 2) ADC and DAC (Playlist) • • Introduction to ADC and DAC • This video will be helpful to all the students of science and engineering in understanding the INL and DNL in ADC. • #nonlinearityInADC • #ADC • #INLandDNL • Follow me on YouTube: • / allaboutelectronics • Follow me on Facebook: • / allaboutelecronics • Follow me on Instagram: • / all_about.electronics • Music Credit: • http://www.bensound.com/
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