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Lecture 5 : Oversampling and Noise Shaping

Lecture 5 : Oversampling and Noise Shaping. Xiliang Luo 2014/10. Oversampling improve A/D accuracy. Oversampling improve A/D accuracy. WSS. Oversampling improve A/D accuracy. Oversampling improve A/D accuracy. Oversampling improve A/D accuracy. Oversampling improve A/D accuracy.

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Lecture 5 : Oversampling and Noise Shaping

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  1. Lecture 5: Oversampling and Noise Shaping Xiliang Luo 2014/10

  2. Oversamplingimprove A/D accuracy

  3. Oversamplingimprove A/D accuracy WSS

  4. Oversamplingimprove A/D accuracy

  5. Oversamplingimprove A/D accuracy

  6. Oversamplingimprove A/D accuracy

  7. Oversamplingimprove A/D accuracy White Noise:

  8. Oversamplingimprove A/D accuracy

  9. Oversamplingimprove A/D accuracy

  10. Oversamplingimprove A/D accuracy

  11. Noise Shaping in A/D To make a significant reduction of number of quantization bits, the required oversampling ratio is too much, which is too costly Oversampling + noise spectrum shaping  much higher gain

  12. Noise Shaping in A/D Direct quantization  uniform noise PSD Noise shaping  non-uniform noise PSD, preferably, most noise is outside the signal band!

  13. Noise Shaping in A/D Noise-shaping quantizer, aka sampled-data Delta-Sigma modulator 1-bit

  14. Noise Shaping in A/D

  15. Noise Shaping in A/D

  16. Noise Shaping in A/D

  17. Noise Shaping in A/D

  18. Noise Shaping in A/D PSD after downsampling

  19. Noise Shaping in A/D Direct Quantization: Noise Shaping:

  20. Noise Shaping in D/A quantization error

  21. Noise Shaping in D/A 1st order noise-shaping for oversampled D/A quantization

  22. Noise Shaping in D/A

  23. Noise Shaping in D/A

  24. Summary • 1. Nyquist-Sampling • 2. Process continuous time signal with discrete system • 3. Downsampling/Upsampling • 4. Polyphase decomposition • 5. D/A, A/D, Noise Shaping

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