Хаос (25.09.2019 15:18, просмотров: 1) ответил йцукен на А никто и не говорит, что усреднением можно исправить интегральную нелинейность. ENOB - это только про шум. Шум дискретизации действительно уменьшается, если он достаточно случайный на интервале усреднения. Иногда он недостаточно случайный, тогда
ENOB - это НЕ только про шум. Signal-to-Noise Ratio (SNR, dB)
The SNR is the ratio of the rms signal amplitude to the rms value of the sum of all spectral components except the first six harmonics and dc. As the input level is decreased, SNR typically decreases decibel-for-decibel in a linear fashion.
<b>Signal-to-Noise-and-Distortion (SINAD, dB)
The SINAD is the ratio of the rms signal amplitude to the rms value of the sum of all spectral components, including harmonics but excluding dc. The difference between SNR and SINAD is
the energy contained in the first six harmonics.
Effective Number of Bits (ENOB, Bits)
ENOB provides a measure of the performance of the ADC that is expressed in bits. ENOB is most accurately measured using a sine wave, curve-fit method. The most common method for computing ENOB is to use the following equation based on the SINAD at the full scale of the converter:
ENOB = (SINAD - 1.76)/6.02
См: стр. 9,10:
AN835
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