Title: A design-optimized continuous-time delta-sigma ADC for WLAN applications
Authors: Schoofs, Raf ×
Steyaert, Michel
Sansen, Willy #
Issue Date: Jan-2007
Publisher: Institute of Electrical and Electronics Engineers
Series Title: IEEE Transactions on Circuits and Systems I, Fundamental Theory and Applications vol:54 issue:1 pages:209-217
Abstract: A third-order continuous-time delta-sigma (Delta Sigma) analog-to-digital converter (ADC) is presented for the conversion of an input signal bandwidth of 10 MHz. Design optimization towards minimal power consumption is demonstrated for the high-speed low-power building blocks of the Delta Sigma modulator. From this point of view, it is shown that GmC integrators are preferred over RC integrators in the low-pass filter of the modulator because they show a better tradeoff between power, speed, and accuracy. A new single-bit quantizer topology is presented that incorporates a local feedback path that improves stability using a switched-voltage technique. Finally, a design methodology for the single-bit digital-to-analog converter (DAC) in the feedback loop is proposed, focusing on the impact of high sampling rates on the stability of the converter. The presented continuous-time ADC achieves a simulated dynamic range of 72 dB and a signal-to-noise-and-distortion-ratio of 66 dB in a 10-MHz signal bandwidth. Therefore, it can be applied for WLAN broadband communication. The power consumption of the Delta Sigma modulator is limited to 7.5 mW. The chip is designed in a 0.18-mu m triple-well CMOS technology.
ISSN: 1057-7122
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - MICAS, Microelectronics and Sensors
× corresponding author
# (joint) last author

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