Question

To avoid aliasing, the wideband ADC is ____ by anti-aliasing filters to suitably alter the _____ waveform.

(a) succeeded, digital

(b) preceded, digital

(c) succeeded, analog

(d) preceded, analog

This question was addressed to me in unit test.

This question is from ADC Tradeoffs in section Technology Tradeoffs in Software Defined Radio of Cognitive Radio

Answer 1

(d) preceded, analog

To avoid aliasing, the wideband ADC (Analog-to-Digital Converter) is preceded by analog anti-aliasing filters. These filters help to reduce the high-frequency components of the signal before sampling, ensuring that the analog signal is within the Nyquist range and preventing aliasing during the conversion to a digital waveform.