Parallel analog-to-digital converter

Details Parallel analog-to-digital converter Parallel analog-to-digital converter

1988-12-13

1990-05-08

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, 341158, H03M 136

Patent

active

049242270

ABSTRACT:
The apparatus comprises a parallel analog-to-digital converter comprising a matrix of differentially coupled transistor pairs wherein the base of one transistor of each differential pair is coupled to a reference voltage and the base of the other transistor of each differential pair is coupled to the input voltage through a specified offset. In each row of differential pairs, the collectors of the transistors are alternately coupled to first and second row output points. The first and second row output points of each row are coupled to the inverting and non-inverting inputs, respectively of a comparator. Additional comparators are provided for comparing the second row output of each row with the first row output of the succeeding row. The matrix is arranged such that the combination of the comparator outputs is unique for each possible digital level in the full scale range of the converter. Logic circuitry is coupled to the comparator outputs to produce a computer usable code therefrom.

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patent: 4229729 (1980-10-01), Devendorf et al.
patent: 4270118 (1981-05-01), Brokaw
patent: 4386339 (1983-05-01), Henry et al.
patent: 4816831 (1989-03-01), Mizoguchi et al.
patent: 4839653 (1989-06-01), Devito
R. E. J. Van de Grift and M. Van der Veen, Session IX: High-Speed ADCs: 8b 50 MHz with Folding and Interpolation Techniques, Report of 1987 IEEE International Solid-State Circuits, Conference Held on Feb. 25, 1987.
R. van de Plassche, P. Baltus, Session XV: A/D Conversion: An 8b 100 MHz Folding ADC, Report on the 1988 IEEE International Solid State Circuits Conference Held on Feb. 19, 1988.
R. E. J. Van de Grift, I. W. J. M. Rutten and M. Van der Veen, An 8-Bit Video ADC Incorporating Folding and Interpolation Techniques, IEEE Journal of Solid-State Circuits, vol. sc-22, No. 6, Dec. 1987.
I. Rutten, R. van de Grift, M. van de Veen, A High-Performance 8-Bit 55 MHz Flash-AC for Video and Professional Applications, IEE Colloquim (1987).

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