| 摘要 |
The quantization noise in a delta-sigma converter can produce correlated noise when the converter is operating. This correlated noise can produce tones in the frequency band of interest. In a departure from conventional wisdom these tones are substantially eliminated by the degration of the signal-to-noise ratio at the input of the comparator in the delta-sigma converter. In the preferred embodiment this degradation of the signal-to-noise ratio is accomplished by attenuating the input signal to the comparator such that the input signal becomes comparable to the noise generated in the input stage of the comparator.
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