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Nyquist Theorem -- Sampling Rate Versus …
Nyquist Theorem -- Sampling Rate Versus bandwidth The Nyquist Theorem states that a signal must be sampled at least twice as fast as the bandwidth of the signal to accurately reconstruct the waveform; otherwise, the high-frequency content will alias at a frequency inside the spectrum of interest (passband). An alias is a false lower frequency component that appears in sampled data acquired at too low a Sampling rate. The following figure shows a 5 MHz sine wave digitized by a 6 MS/s ADC. The dotted line indicates the aliased signal recorded by the ADC at that sample rate. Sine Wave Demonstrating the Nyquist Frequency The 5 MHz frequency aliases back in the passband, falsely appearing as a 1 MHz sine wave.
Nyquist Theorem -- Sampling Rate Versus Bandwidth The Nyquist theorem states that a signal must be sampled at least twice as fast as the bandwidth of
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