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1 Introduction..................................................................................................9
2 Fundamental properties of Analogue-to-digital conversion..................11
2.1 Sampling................................................................................................11
1.2 Quantisation .........................................................................................13
1.3 Nonideality of the conversion............................................................15
1.4 Need to modify the properties in amplitude and frequency
domains .......................................................................................................16
3 Dithering .....................................................................................................19
3.1 Condition for unbiased conversion result ........................................20
3.2 Systematic error of the final result.....................................................23
3.3 Deterministic dithering .......................................................................24
3.3.1 Uniform dithering 24
3.3.2 Triangular distribution 25
3.3.3 Sinusoidal dithering 26
3.4 Stochastic dithering .............................................................................27
3.5 Dithering in floating point conversion .............................................27
4 Resolution, linearity and total uncertainty ..............................................31
5 Viewpoint of measurement information ................................................33
6 Virtual dithering ADC...............................................................................37
7 Applications ................................................................................................39
8 Discussion...................................................................................................43 |
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