Browsing by Subject "Logic circuits"
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Item A design of a ternary arithmetic logic unit(Texas Tech University, 1979-05) Hubbard, Charlie J.The digital industry is at the threshold of a new era in digital design. Current complementary metal oxide semiconductor, CMOS, Integrated Circuit Technology provides a full spectrum of reliable ternary circuits. The CMOS ternary circuits stimulated the growth of multivalued algebras in the areas of synthesis and minimization of ternary functions. The research effort described herein indicates that implementing ternary circuits into an integrated digital design will decrease overall circuit integration without a component density increase. New ternary digital circuits such as an Arithmetic Logic Unit (ALU) provide a predictable increase in computation speed when compared with a binary ALU and the number size. This new high speed ternary ALU may provide the building block in constructing "number crunching" systems for use in weather modeling, nuclear physics computations, and real time digital processing tasks such as speech and image processing, computerized tomography, and air traffic monitors.Item Memristor based arithmetic circuit design(2016-12) Revanna, Nagaraja; Swartzlander, Earl E., Jr., 1945-; Valvano, Jonathan; Akinwande, Deji; Gerstlauer, Andreas; Schulte, MichaelThe revolution in electronics enabled by Moore’s Law has been driven historically by the ability to fabricate ever smaller features lithographically on planar semiconductor platforms. In recent years, this has been slowing down due to the myriad of problems in short channel CMOS technologies. Research is now focusing on realizing Moore’s law by architectural innovation, involving novel circuits and computation paradigms. There has been intense interest and activity directed towards designing logic circuits with memory elements. This is mainly driven by ideas like in-memory compute where logic operations are performed at the memory location in order to overcome the memory-wall bottleneck. Resistive-switching random-access memory (RRAM)/ memristors has a great potential to be the future of non-volatile memory owing to its CMOS compatibility, read-write endurance, power and speed. We describe novel high speed logic circuits for adders and multipliers built with RRAM to support the concept of logic-in-memory. These circuits have significant speed/area/power improvements over the existing designs. The complexity involved in computation in terms of controlling the basic gates, sequence of operations etc. has been significantly reduced. RRAM properties are exploited with the help of a well-known analog element called current mirror. Previously known logic-implication technique to realize digital gates comes with a serious limitation of limited fan-out. By using current mirrors, this limitation can be overcome, enabling more logic operations to run in parallel. Results show that the delay for even an XOR operation can be reduced to 1 cycle, compared to the 5 cycles taken by logic implication. Spice simulations are done with known RRAM models. Simulation results show significant improvement in power consumed over the existing designs. The design of different adders and multipliers are also described. Metrics like area, power and latency are compared, and it shows significant improvement over the state-of-the-art.Item Minimum supply voltage outlier analysis of large scale CMOS devices(Texas Tech University, 2004-05) McDonald, DavidThe theory and experiment of low voltage testing outlier screening methods will be proposed in this paper. Including an active study of maximum operating frequencies in comparison to their minimum voltage operating conditions. The objective of this paper is to discuss the possibility of using low voltage testing and outlier screening methods to reduce bum in time of large scale Integrated Circuits (IC's). In today's ever growing semiconductor market the need for test time reduction and test cost is ever present. By decreasing test overhead a company has the ability to lower product cost and manufacturing time and at the same time increasing potential profit and revenue.