Hi, i was studying about delta-sigma modulator.
What i understood is that by increasing sampling rate dramatically we can distribute quantization noise across oversampling region.
So, by using digital filter and decimation after above process, we can achieve lower quantization noise in audio frequency region.
However, I cannot understand one thing.
We use 1-bit ADC in delta-sigma modulator. But, in the above picture, 'power in noise' is proportion to (delta)^2.
If we use 1-bit ADC, then delta would be extremely larger. So does not it increase the 'power in noise'?
Then, how can we say that 'total power in noise' is the same regardless of sampling frequency?
Thanks,
Yun