Which of the following is untrue about Sigma-Delta ADC?(a) fs>2fmax(b) Zero crossing detector consists of a sample and hold circuit(c) Aperture jitter is minimized due to integration(d) The integrating filter is preceded by a zero crossing detectorI got this question during an interview.My question is based upon ADC Tradeoffs topic in section Technology Tradeoffs in Software Defined Radio of Cognitive Radio

Which of the following is untrue about Sigma-Delta ADC?(a) fs>2fmax(b)

1.	Which of the following is untrue about Sigma-Delta ADC?(a) fs>2fmax(b) Zero crossing detector consists of a sample and hold circuit(c) Aperture jitter is minimized due to integration(d) The integrating filter is preceded by a zero crossing detectorI got this question during an interview.My question is based upon ADC Tradeoffs topic in section Technology Tradeoffs in Software Defined Radio of Cognitive Radio
Answer» The correct answer is (b) Zero crossing DETECTOR consists of a SAMPLE and HOLD circuit The EXPLANATION: Sigma-Delta ADC does not require a sample and hold circuit. The zero-crossing detector can be implemented by threshold logic.

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