ADC Demo

Contents

ADC Demo#

Follow one signal through all three stages of analog-to-digital conversion: sampling, quantization, and encoding. Use the tabs across the top to move between stages.

Interactive demo · Analog-to-Digital Conversion · Lessons 24–25 Open full-screen ↗

Things to Try#

  • Break Nyquist. Lower the sample rate \(f_s\) until it drops below twice the signal frequency. Turn on Show Aliased Ghost to see the lower frequency the ADC records instead.

  • Trade bits for error. On the Quantization tab, step the number of bits from 1 to 6 and watch the number of levels \(2^b\) and the step size \(\Delta V\) change.

  • Clip the signal. Raise the amplitude or gain until the signal leaves the range between \(V_{min}\) and \(V_{max}\).

  • Condition the signal (Lesson 25). Start with a small signal that uses only part of the ADC range, then set the gain \(K\) and bias \(B\) (labelled b in the demo) so it fills the range without clipping. Add high-frequency noise and switch on the anti-aliasing LPF.

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