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Design and Implementation of a Digitally Compensated N-Bit C-xC SAR ADC Model: Optimization of an Eight-Bit C-xC SAR ADC
Linköping University, Department of Electrical Engineering, Electronics System. Linköping University, The Institute of Technology.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this master’s thesis a model of a digitally compensated N-bit C-xC sar adc was developed.The architecture uses charge redistribution in a C-xC capacitor network to performthe conversion. Focus in the master’s thesis was set to understand how the charge is redistributedin the network during the conversion and calibration phase. Redundancy andparasitic capacitors is present in the system and rises the need for extra conversion steps aswell as a calibration algorithm. The calibration algorithm, Bit Weight Estimation, calculatesa weight corresponding to each bit which is used in the last conversion step to perform adigital weighting. The result of extensive calculations in different C-xC capacitor networkswas a model in Python of an N-bit C-xC sar adc. That model was used to create a model ofan eight-bit C-xC sar adc and finding suitable parameters for it through calculations andsimulations. The parameters giving the best inl was chosen. With the best parameters theC-xC sar adc static and dynamic performance was tested and showed an inl of less than1lsb, snr of 47:8 dB and enob of 7:6 bits.

Place, publisher, year, edition, pages
2013. , 64 p.
Keyword [en]
adc, sar, digital calibration
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:liu:diva-97400ISRN: LiTH-ISY-EX--13/4679--SEOAI: diva2:647634
External cooperation
AnaCatum AB
Subject / course
Electrical Engineering
Available from: 2013-09-23 Created: 2013-09-11 Last updated: 2013-09-23Bibliographically approved

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Hallström, Claes
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