Analog-to-digital conversion method and device

Details Analog-to-digital conversion method and device Analog-to-digital conversion method and device

1992-11-30

1994-06-14

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, 307 38, 307 39, 330252, H03M 114, H03M 134, H03M 144

Patent

active

053214021

ABSTRACT:
Analog-to-digital conversion method and device using triangular vertex solution are disclosed. The method includes the steps of defining a first and a second boundary value between which a quantity to be analog-to-digital converted resides, multiplying a difference between the first boundary value and the quantity to be converted by a first coefficient to produce a first physical quantity, multiplying a difference between the second boundary value and the quantity to be converted by a second coefficient to produce a second physical quantity, comparing the first and second physical quantities to obtain a comparison result, and logically converting the comparison result into a digital value. The device includes a first differential converting circuit for generating one or more voltages, which are produced by multiplying a potential difference between a first reference voltage and an input analog voltage by a chain of first coefficients, a second differential converting circuit for generating one or more voltages, which are produced by multiplying a potential difference between a second reference voltage and the input analog voltage by a chain of second coefficients, and a comparator circuit for comparing output voltages of the first and second differential converting circuits, with the output of the comparator circuit being logically converted into a digital value.

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T. Takemoto et al., "A Fully Parallel 10 Bit A/D Converter with Video Speed" IEEE J. Solid-State Circuits, vol. SC-17, pp. 1133-1138, 1982.
T. Shimizu et al., "A 10-bit 20MHz Two-Step Parallel A.D Converter with Internal S/H," IHEE J. Solid-State Circuits vol. SC-24, pp. 13-20, Feb. 1989.

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