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Analog preprocessing in a SNS 2 [mu] low-noise CMOS folding ADC

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Author
Carr, Richard D.
Date
1994-12
Advisor
Pace, Phillip E.
Fouts, Douglas J.
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Abstract
Significant research in high performance analog-to-digital converters (ADCs) has been directed at retaining part of the high-speed flash ADC architecture, while reducing the total number of comparators in the circuit. The symmetrical number system (SNS) can be used to preprocess the analog input signal, reducing the number of comparators and thus reducing the chip area and power consumption of the ADC. This thesis examines a Very Large Scale Integrated (VLSI) design for a folding circuit for a SNS analog preprocessing architecture in a 9-bit folding ADC with a total of 23 comparators. The analog folding circuit layout uses the Orbit 2 micrometers CMOS N-well double-metal, double- poly low-noise analog process. The effects of Spice level 2 parameter tolerances during fabrication on the operation of the folding circuit are investigated numerically. The frequency response of the circuit is also quantified. An Application Specific Integrated Circuit (ASIC) is designed.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/30531
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