NDLI: Two-loop modulator for sigma-delta analog to digital converter

Content Provider	IEEE Xplore Digital Library
Author	Przybysz, J.X. Miller, D.L. Naviasky, E.H.
Copyright Year	2002
Abstract	A two-loop modulator has been designed for a superconductive sigma-delta analog to digital converter. In contrast to semiconductor modulators, which use high-gain amplifiers in the signal feed forward path, the superconductive modulator used digital gain in the signal feedback path. The use of superconductive electronics to precisely feed back a single flux quantum into the second integrator loop and multiple flux quanta into the first integrator loop is a key to this circuit. In simulations of a 40 GHz sampling rate, the modulator obtained a 98 dB signal to noise ratio on the dc-60 MHz band. The modulator tolerated thermal noise well, obtaining 98 dB SNR on the dc-4 MHz band, while sampling at a rate of 4 GHz. The modulator tolerated clock timing jitter better than Nyquist-rate A/D converters, obtaining equivalent performance with 3 times as much rms jitter. Compared to single-loop sigma-delta and oversampled lobe-counting A/D converters, the two-loop modulator can achieve equivalent performance at a significantly reduced sampling and digital filter rate.<>
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2248
Ending Page	2251
Page Count	4
File Size	433532
File Format	PDF
ISSN	10518223
Volume Number	5
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Digital modulation Delta-sigma modulation Analog-digital conversion Superconductivity Sampling methods Feeds Signal to noise ratio Semiconductor optical amplifiers Feedback Circuits
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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