Title: A/D Conversion Using Asynchronous Delta-Sigma Modulation and Time-to-Digital Conversion
Authors: Daniels, Jorg ×
Dehaene, Wim
Steyaert, Michel
Wiesbauer, Andreas #
Issue Date: Sep-2010
Publisher: Institute of Electrical and Electronics Engineers
Series Title: IEEE Transactions on Circuits and Systems 1, Regular Papers vol:57 issue:9 pages:2404-2412
Abstract: An analog-to-digital conversion (ADC) scheme based on asynchronous Delta Sigma modulation and time-to-digital conversion is presented. An asynchronous Delta Sigma modulator translates the analog input to an asynchronous duty-cycle modulated signal. Next, the edge locations are digitally measured using a time-to-digital converter (TDC). This information is then digitally processed into a conventional digital signal. The performance of this novel ADC scheme is theoretically analyzed and verified with simulations. With the proposed digital demodulation algorithm, 11-bit resolution can be obtained with an overcycling ratio (OCR) of only four, which is suitable for high bandwidth applications such as very high bit-rate digital subscriber line (VDSL). When a higher OCR can be tolerated, a gated ring-oscillator (GRO) TDC with an inherent first-order noise shaping property is suggested in combination with a digital continuous-time moving-average (CTMA) filter. This allows for resolutions in excess of 13 bits, which is suitable for ADSL2+. The proposed technique shifts the complexity toward the digital domain, leading to more compact ADC and reduced power consumption, and is, therefore, particularly suited for ADC in ultralow-voltage nanometer technologies that are used for high-speed data communication applications.
ISSN: 1549-8328
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - MICAS, Microelectronics and Sensors
× corresponding author
# (joint) last author

Files in This Item:

There are no files associated with this item.

Request a copy


All items in Lirias are protected by copyright, with all rights reserved.

© Web of science