Design techniques for low noise and high speed A/D converters

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dc.contributor.advisor Sanchez -Sinencio , Edgar en_US
dc.contributor.committeeMember Parlos , Alexander ,G . en_US
dc.creator Gupta , Amit Kumar en_US 2010 -01 -14T23 :55 :28Z 2014 -02 -19T19 :38 :16Z 2010 -01 -14T23 :55 :28Z 2014 -02 -19T19 :38 :16Z 2006 -12 en_US 2009 -05 -15 en_US
dc.identifier.uri http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1666
dc.description.abstract Analog -to -digital (A /D ) conversion is a process that bridges the real analog world to digital signal processing . It takes a continuous -time , continuous amplitude signal as its input and outputs a discrete -time , discrete -amplitude signal . The resolution and sampling rate of an A /D converter vary depending on the application . Recently , there has been a growing demand for broadband ( >1 MHz ) , high -resolution ( >14bits ) A /D converters . Applications that demand such converters include asymmetric digital subscriber line (ADSL ) modems , cellular systems , high accuracy instrumentation , and medical imaging systems . This thesis suggests some design techniques for such high resolution and high sampling rate A /D converters . As the A /D converter performance keeps on increasing it becomes increasingly difficult for the input driver to settle to required accuracy within the sampling time . This is because of the use of larger sampling capacitor (increased resolution ) and a decrease in sampling time (higher speed ) . So there is an increasing trend to have a driver integrated onchip along with A /D converter . The first contribution of this thesis is to present a new precharge scheme which enables integrating the input buffer with A /D converter in standard CMOS process . The buffer also uses a novel multi -path common mode feedback scheme to stabilize the common mode loop at high speeds . Another major problem in achieving very high Signal to Noise and Distortion Ratio (SNDR ) is the capacitor mismatch in Digital to Analog Converters (DAC ) inherent in the A /D converters . The mismatch between the capacitor causes harmonic distortion , which may not be acceptable . The analysis of Dynamic Element Matching (DEM ) technique as applicable to broadband data -converters is presented and a novel second order notch -DEM is introduced . In this thesis we present a method to calibrate the DAC . We also show that a combination of digital error correction and dynamic element matching is optimal in terms of test time or calibration time . Even if we are using dynamic element matching techniques , it is still critical to get the best matching of unit elements possible in a given technology . The matching obtained may be limited either by random variations in the unit capacitor or by gradient effects . In this thesis we present layout techniques for capacitor arrays , and the matching results obtained in measurement from a test -chip are presented . Thus we present various design techniques for high speed and low noise A /D converters in this thesis . The techniques described are quite general and can be applied to most of the types of A /D converters . en_US
dc.format.medium electronic en_US
dc.format.mimetype application /pdf en_US
dc.language.iso en _US en_US
dc.subject A /D converter en_US
dc.title Design techniques for low noise and high speed A /D converters en_US
dc.type Book en
dc.type.genre Electronic Thesis en_US
dc.type.material text en_US
dc.format.digitalOrigin born digital en_US


Design techniques for low noise and high speed A/D converters. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1666 .

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