Analog-to-digital converter of successive-approximation type

Details Analog-to-digital converter of successive-approximation type Analog-to-digital converter of successive-approximation type

1988-03-18

1990-01-30

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, H03M 138

Patent

active

048976580

ABSTRACT:
An analog-to-digital converter of the successive-approximation type has a successive-approximation logic circuit for successively generating selection signals defined by significant bits in a digital value, a string of high resistance elements to provide voltage dividers for successively dividing a reference voltage into divided voltages, a switch matrix circuit for generating the divided voltages when activated in response to the selection signals, a comparator for successively comparing an analog level with the divided voltages and for generating comparison signals respectively indicative of the significant bits and an output circuit for generating an output digital signal defined by the significant bits when applied with all the comparison signals, the output circuit being associated with the logic circuit for causing it to generate the selection signals in response to the comparison signals. A string of low resistance elements are provided to apply therethrough the reference voltage to at least one of the voltage dividers during a short period of time immediately after the one of the voltage dividers has been activated.

REFERENCES:
Kanemaru et al, "11 Bit Successive Approximation CMOS A/D Convertor", Mar. 26, 1987, p. 367 and front cover of National Convention Record, 1987, The Institute of Electronics, Information and Communication Engineers.
Kuboki et al., "Nonlinearity Analysis and Evaluation of Resistor String A/D Converters", a thesis of National Convention Record edited by the Institute of Electronics, Information and Communication Engineers in Japan, 884/12, vol. J67-CNo. 12, pp. 941-948.

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