Нашел-таки: Topic: Inter Sample Peaks in DSD?
Дополнительно, отклонение от линейности зависимости SNR в слышимом диапазоне от интенсивности SDM сигнала: Basics of Sigma-Delta Modulation, раздел 22.214.171.124 (9789400713864-c2.pdf (609,0 КБ).)
Since the total output power for a 1-bit converter is constant, the noise power increases when the signal power reduces. If the increase in noise power would be evenly distributed over all frequencies,the SNR in the baseband would decrease relatively more when the input power is reduced. In practice however, the amount of baseband quantization noise reduces when the input signal becomes smaller, and therefore the SNR will be higher than expected. This SNR behavior as a function of the input amplitude is depicted in Fig. 2.22. The SDM used in this experiment was a fifth order with two resonators. The measured, ideal and expected SNR curves are aligned to read the same value for a −25 dB input signal. The difference between the ideal and expected curve is approximately 0.7 dB for a −5 dB input, and negligible for inputs below −10 dB.
The explanation of this phenomenon can be found by studying the high frequency
noise spectrum. When low amplitude inputs are applied, the SDM will start to gen-
erate high frequency idle tones, which take most of the noise power. When the input
amplitude is increased, the idle tones cannot exist anymore and the low frequency
noise-floor will increase .