Download - Lecture 5 : Oversampling and Noise Shaping
![Page 1: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/1.jpg)
Lecture 5: Oversampling and Noise ShapingXILIANG LUO
2014/10
![Page 2: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/2.jpg)
Oversamplingimprove A/D accuracy
![Page 3: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/3.jpg)
Oversamplingimprove A/D accuracy
WSS
![Page 4: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/4.jpg)
Oversamplingimprove A/D accuracy
![Page 5: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/5.jpg)
Oversamplingimprove A/D accuracy
![Page 6: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/6.jpg)
Oversamplingimprove A/D accuracy
![Page 7: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/7.jpg)
Oversamplingimprove A/D accuracy
White Noise:
![Page 8: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/8.jpg)
Oversamplingimprove A/D accuracy
![Page 9: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/9.jpg)
Oversamplingimprove A/D accuracy
![Page 10: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/10.jpg)
Oversamplingimprove A/D accuracy
![Page 11: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/11.jpg)
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
![Page 12: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/12.jpg)
Noise Shaping in A/D
Direct quantization uniform noise PSDNoise shaping non-uniform noise PSD, preferably, most noise is outside the signal band!
![Page 13: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/13.jpg)
Noise Shaping in A/DNoise-shaping quantizer, aka sampled-data Delta-Sigma modulator
1-bit
![Page 14: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/14.jpg)
Noise Shaping in A/D
![Page 15: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/15.jpg)
Noise Shaping in A/D
![Page 16: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/16.jpg)
Noise Shaping in A/D
![Page 17: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/17.jpg)
Noise Shaping in A/D
![Page 18: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/18.jpg)
Noise Shaping in A/D
PSD after downsampling
![Page 19: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/19.jpg)
Noise Shaping in A/D
Direct Quantization:
Noise Shaping:
![Page 20: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/20.jpg)
Noise Shaping in D/A
quantization error
![Page 21: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/21.jpg)
Noise Shaping in D/A
1st order noise-shaping for oversampled D/A quantization
![Page 22: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/22.jpg)
Noise Shaping in D/A
![Page 23: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/23.jpg)
Noise Shaping in D/A
![Page 24: Lecture 5 : Oversampling and Noise Shaping](https://reader036.vdocuments.net/reader036/viewer/2022081603/5681354f550346895d9cad9d/html5/thumbnails/24.jpg)
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