Monkeybad
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Posts: 31
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Hello, this is an interesting question. Don't think it too complicate,but think it more intuitively and without any math. As Tosei says, quantization occurs after sampling. It is the point. Any signal's BW after sampling can't exceed the half of the sampling frequency. The quantization noise is also a signal, of course it can't have higher frequency component than fs/2. For example, if you describe a signal in every one second, but your ADC's precision is limited so the error will occur in every one second. Can the error changing occur in a smaller time interval such like 1.5s? Of course not! The fastest changing is in the situation of going up, and down, which cost 2 second. So the maximum frequency of the error signal (quantization noise) is 1/2s=0.5Hz.
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