Topic: Digital Circuits
In sigma delta ADC, high bit accuracy is achieved by
- A. Over sampling and noise shaping
- B. Over sampling
- C. Under sampling
- D. None of the above
Answer: A. Over sampling and noise shaping
Explanation: Sigma-delta ADCs achieve high resolution through oversampling (sampling much faster than the Nyquist rate) combined with noise shaping, which pushes quantization noise into higher frequencies that are then filtered out.