Then you see a schematic like following. This is to quantize an input signal. Do left click to select SIGGEN (U_0) and right click to choose "Open a Monitor". This generates a sine wave which frequency is 400Hz. Next, open a monitor for FFTMON (U_4) to see its spectrum. The spectrum has a peak at 400Hz and the floor noise is -120dB below compare to the peak. That means SNR (Signal to Noise Ratio) is about 120dB. Next

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