This circuit simulation illustrates the journey of a signal through the stages of ADC, DAC, and analog filtering. The green waveform represents the original analog input signal. The red vertical lines indicate the sampling clock used by the ADC to discretize the input. The resulting DAC output is shown as the stepped blue waveform, which approximates the original signal but contains sharp transitions and high-frequency components. To restore a smooth analog waveform, the signal is passed through