Design and Simulation of Single Electron Tunneling Circuits for Brownian Motion Based Logic and Arithmetic Computation

Design and Simulation of Single Electron Tunneling Circuits for Brownian Motion Based Logic and Arithmetic Computation

Agbo, I.O.

Cotofana, S.D. (mentor)

Electrical Engineering, Mathematics and Computer Science

Microelectronics & Computer Engineering

Master, Computer Engineering

2010-02-15

In this thesis, the implementations of Single Electron Tunneling (SET) circuits for Brownian Motion Based Logic and Arithmetic Computation were investigated. Random fluctuations and noise are major factors interfering with the operation of nanometer scale electronic devices and circuits, as the feature size decreases. In SET technology, one of these interfering effects, namely quantum tunneling, is actually utilized for computations by controlling the transport of individual electrons. However, at the single electron level, random fluctuations are largely unavoidable. In previous research, Brownian Motion based building blocks were proposed which take advantage of random fluctuations to function. i.e, Conservative Join (CJoin)and Hub. However, the SET design of the CJoin had two major limitations when taking industrial implementation into account. Firstly, it had long diagonal wires that appear on the design literally. Secondly, the circuit parameters of the tunnel junction capacitances fell short of the industrial standard. In this research we present a new design for the Cjoin, i.e, the Redesigned CJoin. In the Redesigned CJoin the long diagonal wires that cause routing problem are eliminated and additionally the circuit parameters are industrially realizable, while meeting the same functionality. Secondly, we construct networks of the Redesigned CJoin design and the Hub and show that the two blocks can be used to build computational units. We investigate networks of two Hubs and one redesign CJoin, three Hubs and two redesign CJoin and network of four Hubs and four redesign CJoin. Third, we propose logic and arithmetic computation with 2-by-2 CJoin Brownian circuit Network. We investigate the logic and arithmetic computation with 2-by-2 CJoin based NAND-gate, NOR-gate and Half-Adder. Finally, we utilized a buffering scheme from previous research to improve the functionality robustness of the Half-Adder. We also investigate static buffer with circuit parameters at 1K. We investigate a static Buffered 2-by-2 CJoin based Half-Adder. All designs in this thesis are verified through simulations. This thesis establishes a concrete design platform for complex Brownian motion Based logic and arithmetic computation.

Single Electron Tunneling
Brownian Motion

http://resolver.tudelft.nl/uuid:610cbb5e-dc40-4068-8064-6c2c5e0d1364

2010-02-26

Student theses

master thesis

(c) 2010 Agbo, I.O.