As a follow up to my previous question there is another argument I have difficulty to understand. First here the related information from the text:
Above what I understand is there are two ways to reduce LSB hence to obtain better resolution. One is to reduce the reference voltage. The second way is to use a higher resolution ADC.
But the text says for both ways when the LSB is reduced SNR performance degrades. As far as I know the quantization noise decreases with better resolution as the formula is (6.02n + 1.76) dB where n is the the number of bits available for discretization.
But the text is talking about loss in SNR performance due to lowering the LSB value. Loss in SNR performance I guess means SNR gets worse.
How does making the resolution better degrade the SNR performance? I dont get why would SNR of the input signal decrease/degrade by doing that. Can this be explained in a clear fashion?