Question
Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope?
Answer Options
- A) Sampling rate of the analog-to-digital converter
- B) Analog-to-digital converter reference frequency
- C) Q of the circuit
- D) All these choices are correct
Correct Answer: A
Explanation
A digital oscilloscope (DSO) converts the analog input signal into digital data for storage, processing, and display. This conversion is handled by a critical component: the Analog-to-Digital Converter (ADC). The ADC’s speed determines how frequently the incoming signal voltage is measured.
According to the Nyquist theorem, for a signal to be accurately reconstructed digitally, it must be sampled at a rate that is at least twice the frequency of the highest frequency component present in the signal. Therefore, the sampling rate of the analog-to-digital converter is the fundamental factor that limits the highest frequency signal a digital oscilloscope can accurately capture and display without introducing distortion (aliasing).
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