How do ADC/DACs deal with out of sync signals near Nyquist frequency?

1. What happens to signal above Nyquist frequency?
2. What can be done to unwanted frequency components that exceeds the Nyquist requirement?
3. What happens to the signal if it is sampled below Nyquist limit?
4. What is Nyquist frequency in ADC?

What happens to signal above Nyquist frequency?

When a component of the signal is above the Nyquist, a sampling error occurs that is called aliasing. Aliasing “names” a frequency above Nyquist by an “alias” the same distance below Nyquist. Sinusoidal signal at 1.3 times Nyquist before sampling into pixels.

What can be done to unwanted frequency components that exceeds the Nyquist requirement?

Optical or electrical filtering is therefore needed to remove any frequencies that are above the Nyquist limit (Figure 8). Figure 8. A signal sampled at less than two points per cycle and a lower frequency with identical values at the sampling points.

What happens to the signal if it is sampled below Nyquist limit?

As the sampling frequency decreases, the signal separation also decreases. When the sampling frequency drops below the Nyquist rate, the frequencies will crossover and cause aliasing.

What is Nyquist frequency in ADC?

If a signal has frequency rate of f_M, then the sampling rate needs to be at least f_s such that: a f_M < (f_s /2) or f_M < 0.5 x f_s) A term that is commonly used is the “Nyquist frequency.” The Nyquist frequency is (f_s /2), or one-half of the sampling rate.