Cyclic analog-to-digital converter that reduces the accumulation

Details Cyclic analog-to-digital converter that reduces the accumulation Cyclic analog-to-digital converter that reduces the accumulation

1997-12-15

1999-11-30

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, H03M 134

Patent

active

059950358

ABSTRACT:
Cyclic A/D-conversion of an analog input signal is performed according to a new and inventive recursive algorithm which generates a Gray coded digital output signal. In cyclic A/D-conversion, the output bits are generated cyclically, one by one. According to the inventive Gray coding algorithm, the analog input signal is cyclically subjected to a sample and hold operation, selectively, depending on the previously generated output bit, to a signal inversion, to an amplification by two, and to an addition of a predetermined reference signal. In a cyclic A/D-converter architecture based on the recursive Gray coding algorithm according to the invention, the accumulation of offset errors will generally be very low. Furthermore, the fact that the signal inversion is digitally controlled enables high precision implementations which further improve the performance of the cyclic A/D-converter according to the invention.

REFERENCES:
patent: 3035258 (1962-05-01), Chasek
patent: 3187325 (1965-06-01), Waldhauer
patent: 4119960 (1978-10-01), Hill
patent: 4599602 (1986-07-01), Matzuzawa et al.
patent: 4745394 (1988-05-01), Cornett
Plassche, Rudy J., "A High-Speed 7 Bit A/D Converter", IEEE Journal of Solid State Circuites, vol. SC-14, No. 6, Dec. 1979.

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