Electronic digital logic circuitry – Three or more active levels – With conversion
Patent
1997-04-03
1998-08-04
Allen, Stephone
Electronic digital logic circuitry
Three or more active levels
With conversion
326135, 326134, 341133, 341102, 341 82, 341 83, H03K 1900, H03K 1910
Patent
active
057899401
ABSTRACT:
Multiple resonant tunneling devices offer significant advantages for realizing ultra-dense, ultra-high performance multivalued logic arithmetic integrated circuits. A multivalued logic adder is disclosed, wherein two numbers represented by positive digit base-M range-N words are added by two-input summation circuits 40 which sum corresponding digits, then the digit sums are decomposed into a binary representation by range-7 multivalued to binary converter circuits 42, then three-input summation circuits 44 sum appropriate bits of the binary representations to calculate the digits of a positive digit base-2 range-4 word whose value is the sum of the two numbers. Preferably, the decomposition to binary representation is performed by multi-valued folding circuits 56 which are connected by voltage divider circuitry. Preferably, the multi-valued folding circuits contain multiple-peak resonant tunneling transistors 54. Ripple carries are eliminated and the speed of the adder is independent of input word width.
REFERENCES:
patent: 3156816 (1964-11-01), Kosonocky et al.
patent: 3207913 (1965-09-01), Herzog
patent: 4465944 (1984-08-01), Shin
Allen Stephone
Brady III W. James
Donaldson Richard L.
Roseen Richard
Swayze, Jr. W. Daniel
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