Read e-book online Digitally Assisted Pipeline ADCs: Theory and Implementation PDF

By Boris Murmann

ISBN-10: 1402078404

ISBN-13: 9781402078408

With the appearance of robust electronic sign processing in transportable digital purposes, we've seen a turning out to be, unhappy call for for energy effective, high-speed and high-resolution analog-to-digital converters (ADCs). whereas expertise scaling has ended in innovative profits in electronic computing strength and effort potency, growth in analog-to-digital conversion interfaces has been relatively gradual. Digitally Assisted Pipeline ADCs: conception and Implementation explores the chance to lessen ADC energy dissipation through leveraging electronic sign processing features in effective line built-in circuit expertise. The defined digitally assisted pipelined ADC makes use of a statistics-based procedure id process as an allowing aspect to exchange precision residue amplifiers with easy open-loop achieve levels.

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This difference in slopes may be due to the fact that many ADCs are not optimized for peak throughput alone, but also for good power efficiency or other application-specific constraints. Nevertheless, the slow improvement of the peak performance indicates that the progress in conversion interfaces has been lagging that of purely digital circuits discussed in section 2. 0E+08 1987 1992 1997 Figure 2-1. ADC performance trend. 1 ADCs using cooled, superconducting devices have been excluded here. 2, Figure 2-2 shows the development of the energy per conversion figure of merit (equation (2-3)) over time.

The following section briefly discusses these quantities with respect to their origin and limitations. 1 ADC Figure of Merit Considerations The product of conversion bandwidth and number of effective quantization levels represents the most basic performance metric for ADCs [17]. 76dB . 02dB (2-2) Since the signal-to-noise and distortion ratio (SNDR) of a converter usually depends on the frequency of the input signal, this figure of merit must include some fixed condition for the frequency at which ENOB was measured.

This effect is important in noise-limited analog circuits, which are analyzed in more detail in section 5. For further comparison and figure of merit calculations, we use supply voltages from the current and previous technology scaling roadmaps [7] (see Figure 3-1). 18µm). 06 Feature Size [µm] Figure 3-1. Supply voltage scaling. 2 Transit Frequency The transit frequency (fT) can be regarded as a small-signal, high frequency figure of merit for transistors. At the operating frequency f=fT, a transistor is defined to have unity current gain in a common source configuration with shorted drain.

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Digitally Assisted Pipeline ADCs: Theory and Implementation by Boris Murmann


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