Analog-to-Digital Conversion by Marcel Pelgrom

By Marcel Pelgrom

This textbook is acceptable to be used in graduate-level curricula in analog-to-digital conversion, in addition to for working towards engineers wanting a cutting-edge reference on information converters. It discusses quite a few analog-to-digital conversion ideas, together with sampling, quantization, reference new release, nyquist architectures and sigma-delta modulation. This booklet offers an outline of the cutting-edge during this box and specializes in problems with optimizing accuracy and pace, whereas decreasing the facility level.

This new, 3rd variation emphasizes novel calibration techniques, the categorical necessities of recent structures, the implications of 22-nm expertise and the necessity for a extra statistical method of accuracy. Pedagogical improvements to this variation contain extra, new routines, solved examples to introduce all key, new suggestions and warnings, comments and tricks, from a practitioner's standpoint, anyplace applicable. enormous history info and useful suggestions, from designing a PCB, to lay-out facets, to trade-offs on approach point, supplement the dialogue of uncomplicated ideas, making this publication a invaluable reference for the skilled engineer.

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8 < 0; ! / D 1; 0 < ! BW : 0; ! t d! x/=x function with ringings on both sides of the pulse. These ringings will be triggered by transitions in the signal and are disastrous in many applications. On a television screen a vertical stripe would on either side be accompanied by shadows. In an audio system these ringings lead to phase distortion, or in more musical terms: blurring of the instrument’s position. These practical considerations often lead to a sample rate of at least 2:5–3 the bandwidth.

If directly a 15 MHz sine wave was sampled the sampled data sequence would be similar and even perfectly identical provided that the mutual phase shift is correct. In perfect conditions there is no way to tell from which time-continuous signal (in this case 15 or 135 MHz) this sequence originates. 16 on page 40. 4 Reconstruction of Sampled Data The sequence of samples (after analog-to-digital conversion and any form of digital signal processing) that arrives at the input of a digital-to-analog converter is a set of numerical values corresponding to the frame of sample moments.

4 Chopping Chopping is a technique used for improving accuracy by modulating error-sensitive signals to frequency bands where the signal processing is free of errors, see also 10 Subsampling by a rational factor (a division of two integers) or an irrational factor requires to calculate the signal at each new sample moment by interpolation of the existing samples. This technique is often applied in image processing and is used to combine data from sources with asynchronous clocks. Some fast-running hardware is needed to carry out the interpolation.

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