Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1986-10-06
1990-02-06
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341136, H03M 168
Patent
active
048991511
ABSTRACT:
A plurality of members, each constructed to produce a substantially constant current when energized, are disposed electrically in a matrix defined by a plurality of rows and a plurality of columns. A plurality of signals cumulatively represent a digital value. Each of the signals has logic levels respectively coding for binary "1" and binary "0" and each has an individual binary significance. The binary signals of intermediate binary significance are decoded to activate an individual rows. The binary signals of high binary significance are decoded to activate an individual column. The member common to the activated row and the activated column then receives a substantially constant current, as do all of the members of lower binary signficance than such common member. The signals of lowest binary significance are also decoded to produce a current having a magnitude indicative of the binary value coded by such signals. This magnitude corresponds to that obtained by multiplying a particular portion of the substantially constant current by a ratio having as a numerator the value represented by the binary signals of least binary significance and having as its denominator the maximum value capable of being coded by such binary signals. The current coding for the binary signals of the least binary significance passes through a member otherwise superfluous in the matrix and preferably having an extreme position electrically in the matrix. The currents flowing through the members in the matrix are added in an output line to indicate an analog of the digital value.
REFERENCES:
patent: 4490634 (1984-12-01), Hareyama
Schoeff, "IEEE Journal of Solid-State Circuits", vol. SC-14, No. 6, Dec. 1979, pp. 904-911.
Brooktree Corporation
Hoff Marc S.
Roston Ellsworth R.
Schwartz Charles H.
Shoop Jr. William M.
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