Analog-to-digital converter with sigma-delta duty cycle encoded

Details Analog-to-digital converter with sigma-delta duty cycle encoded Analog-to-digital converter with sigma-delta duty cycle encoded

1994-08-09

1996-09-24

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341157, H03M 302, H03M 160

Patent

active

055595146

ABSTRACT:
An analog-to-digital converter employs a sigma-delta modulator that produces a pulsed output with an average duty cycle that varies with an analog input to the modulator. A counter averages the modulator's output duty cycle, and feeds the averaged information onto a one-line transmission circuit for delivery to a remote location. Both the sigma-delta modulator and the counter are synchronized to the same local clock, so that the counter's duty cycle remains substantially constant even if the clock frequency varies. This allows for a simple clock configuration that can be integrated along with the sigma-delta modulator and counter on a single IC chip of reasonable size. When used for temperature sensing, the counter's output duty cycle provides an indication of the locally sensed temperature, independent of temperature-induced variations in the clock frequency.

REFERENCES:
patent: 3731072 (1973-05-01), Johnston
patent: 3879663 (1975-04-01), McGrogan, Jr.
patent: 5245343 (1993-09-01), Greenwood et al.
Transducer Interfacing Handbook-A Guide to Analog Signal Conditioning, ed. by D. Sheingold, Analog Devices, Inc., 1981, pp. 125-126.
Electronics Engineers' Handbook, Ed. by Fink et al., McGraw-Hill Book Company, 3d Ed. 1989, pp. 14.39-14.41.
Sedra et al., Microelectronic Circuits, Holt, Reinhart and Winston, 1987, pp. 890-894.
Sarhang-Nejad, "Realization of a High-Resolution Multibit .SIGMA..DELTA. Analog-Digital Converter", Ph.D. Dissertation, University of California at Los Angeles, 1991.
Taub, et al., Digital Integrated Circuits, McGraw-Hill, 1977, pp. 322-355.

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