By Boris Murmann
ISBN-10: 1402078404
ISBN-13: 9781402078408
With the arrival of strong electronic sign processing in transportable digital functions, we've seen a starting to be, unhappy call for for strength effective, high-speed and high-resolution analog-to-digital converters (ADCs). whereas know-how scaling has resulted in progressive earnings 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 strength dissipation through leveraging electronic sign processing features in high quality 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 interchange precision residue amplifiers with basic open-loop achieve levels.
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Additional info for Digitally Assisted Pipeline ADCs: Theory and Implementation
Example text
For simplicity in this analysis, we assume r=1. The achievable speed of the converter is given by the bandwidth of the pre-amp input stage driving a comparator latch (see Figure 3-9). The unitygain bandwidth fu is given by fu gm 1 , ' 2S W c Lmin C gs' C db (3-18) ' ' and C gs are the drain-to-bulk and gate-to-source junction where C db capacitance per device width. The constant c relates the device sizes of the two stages and is specific to the topology used. For simplicity in the SCALING ANALYSIS 29 following discussion, we assume c=1.
However, in high dynamic range circuits it is usually true that Cgs< To an increasing extent, data converters are the bottleneck of many systems both for throughput and power dissipation. As an example, Figure 2-5 shows a typical mixed-signal application in which both the ADC and digital signal processing backend, consisting of roughly one million logic gates, have been integrated on the same chip. Interestingly, as typical in such applications, the ADC portion (upper right corner) occupies only a small fraction of the die area but consumes more than 50% of the total system power. Digitally Assisted Pipeline ADCs: Theory and Implementation by Boris Murmann
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