Multifunctional Boolean Logic Using Single-Electron Transistors

Katsuhiko NISHIGUCHI  Hiroshi INOKAWA  Yukinori ONO  Akira FUJIWARA  Yasuo TAKAHASHI  

IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.11   pp.1809-1817
Publication Date: 2004/11/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on New System Paradigms for Integrated Electronics)
single-electron transistor,  programmable Boolean logic,  silicon-on-insulator,  

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A multifunctional Boolean logic circuit composed of single-electron transistors (SETs) was fabricated and its operation demonstrated. The functions of Boolean logic can be changed by the half-period phase shift of the Coulomb-blockade (CB) oscillation of some SETs in the circuit, and an automatic control based on a feedback process is used to attain an exact shift. The amount of charges in the memory node (MN), which is capacitively coupled to the SET, controls the phase of the CB oscillation, and the output signal of the SET controls the amount of charge in the MN during the feedback process. This feedback process automatically adjusts SET output characteristics in such a way that it is used for the multifunctional Boolean logic. We experimentally demonstrated the automatic phase control and examined the speed of the feedback process by SPICE circuit simulation combined with a compact analytical SET model. The simulation revealed that programming time could be of the order of a few ten nanoseconds, thereby promising high-speed switching of the functions of the multifunctional Boolean logic circuit.