What is Nyquist rate in ADC?
Nyquist rate: Per the Nyquist sampling theorem, an analog signal should be sampled at a rate of at least twice the maximum frequency content of that signal to achieve a faithful representation: Fsnyquist = 2 × Fsignal where Fsnyquist is the Nyquist sampling frequency and Fsignal is the signal frequency.
What is sampling frequency of ADC?
The sample rate for an ADC is defined as the number of output samples available per unit time and is specified as samples per second (SPS). Two aspects of sample rate that must be considered when selecting an ADC for a particular application are the minimum sample rate and maximum sample rate.
How do you choose a sampling frequency Nyquist?
Simply stated, the Nyquist criterion requires that the sampling frequency be at least twice the highest frequency contained in the signal, or information about the signal will be lost. If the sampling frequency is less than twice the maximum analog signal frequency, a phenomenon known as aliasing will occur.
What is the Nyquist frequency of the sampling?
In signal processing, the Nyquist frequency (or folding frequency), named after Harry Nyquist, is a characteristic of a sampler, which converts a continuous function or signal into a discrete sequence. In units of cycles per second (Hz), its value is one-half of the sampling rate (samples per second).
When is the frequency of a signal less than the Nyquist frequency?
When the highest frequency ( bandwidth) of a signal is less than the Nyquist frequency of the sampler, the resulting discrete-time sequence is said to be free of the distortion known as aliasing, and the corresponding sample-rate is said to be above the Nyquist rate for that particular signal.
Where does the sampled frequency fall in the ADC?
Any sampled frequency by the ADC will fall in the first Nyquist (DC – 125 MHz) band of the ADC. This phenomenon is called aliasing, hence the frequencies including the band of interest, its second and third harmonics effectively fold back or alias into the first Nyquist band. This is shown in Figure 5, as follows: Figure 5.
How is the Nyquist rate related to the sampling rate?
The Nyquist rate is twice the maximum component frequency of the function being sampled. For example, the Nyquist rate for the sinusoid at 0.6 fs is 1.2 fs, which means that at the fs rate, it is being undersampled. Thus, Nyquist rate is a property of a continuous-time signal, whereas Nyquist frequency is a property of a discrete-time system.
What are the advantages of a RF sampling ADC?
This means that the processing is much more power efficient. The new generation of RF sampling ADCs not only have GSPS sampling capability, but also have eschewed the dated LVDS outputs for high speed serial interface.
