Improving the Cascode Analogue-to-Digital Converter Using Switched-Current Techniques. Phinikarides, A. Ph.D. Thesis, University of Southampton, Southampton, United Kingdom, September, 2008. abstract bibtex This dissertation presents the work done for improving the cascode analogue-to-digital converter by using switched-current techniques. Various current copier cells and their effects on the copied current were investigated. This included techniques for reducing the error caused by charge injection, large current inputs and low output resistance. The result of the investigation was that active current copier cells offered the best performance by solving the low output resistance problem and that capacitors added in parallel to the gate and source of the memory transistor solved the problem of large input currents. The converter was redesigned with active current copier cells which were used to replicate the operation of the original cascode ADC. The same technology with the original cascode ADC was used (Mietec 2.4$μ$m). Simulations done in HSpice have shown that the converter is operating correctly and has decreased the conversion errors by more than 200%, up to the last stage, when the current is fed into the current comparator. The comparator was kept the same as the original cascode ADC and could not be adapted for use in the new circuit. The error was reduced to less than half though, which proves that this type of converter has potential. The simulations have also shown that the switched-current ADC had a maximum power consumption of 1.45mW /bit, which is less than half the consumption of the original cascode ADC (3mW /bit).
@phdthesis{phinikaridesImprovingCascodeAnaloguetodigital2008,
type = {{{MSc}} Dissertation},
title = {Improving the Cascode Analogue-to-Digital Converter Using Switched-Current Techniques},
author = {Phinikarides, Alexander},
year = {2008},
month = sep,
address = {{Southampton, United Kingdom}},
abstract = {This dissertation presents the work done for improving the cascode analogue-to-digital converter by using switched-current techniques. Various current copier cells and their effects on the copied current were investigated. This included techniques for reducing the error caused by charge injection, large current inputs and low output resistance. The result of the investigation was that active current copier cells offered the best performance by solving the low output resistance problem and that capacitors added in parallel to the gate and source of the memory transistor solved the problem of large input currents. The converter was redesigned with active current copier cells which were used to replicate the operation of the original cascode ADC. The same technology with the original cascode ADC was used (Mietec 2.4{$\mu$}m). Simulations done in HSpice have shown that the converter is operating correctly and has decreased the conversion errors by more than 200\%, up to the last stage, when the current is fed into the current comparator. The comparator was kept the same as the original cascode ADC and could not be adapted for use in the new circuit. The error was reduced to less than half though, which proves that this type of converter has potential. The simulations have also shown that the switched-current ADC had a maximum power consumption of 1.45mW /bit, which is less than half the consumption of the original cascode ADC (3mW /bit).},
copyright = {All rights reserved},
langid = {english},
school = {University of Southampton},
file = {/home/alexis/Zotero/storage/9A35XG23/Phinikarides - 2008 - Improving the cascode analogue-to-digital converte.pdf}
}
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