Wancheng Zhang et al 2007 Nanotechnology 18 495201 doi:10.1088/0957-4484/18/49/495201
Wancheng Zhang, Nan-Jian Wu and Fuhua Yang
Show affiliationsThis paper proposes novel universal logic gates using the current quantization characteristics of nanodevices. In nanodevices like the electron waveguide (EW) and single-electron (SE) turnstile, the channel current is a staircase quantized function of its control voltage. We use this unique characteristic to compactly realize Boolean functions. First we present the concept of the periodic-threshold threshold logic gate (PTTG), and we build a compact PTTG using EW and SE turnstiles. We show that an arbitrary three-input Boolean function can be realized with a single PTTG, and an arbitrary four-input Boolean function can be realized by using two PTTGs. We then use one PTTG to build a universal programmable two-input logic gate which can be used to realize all two-input Boolean functions. We also build a programmable three-input logic gate by using one PTTG. Compared with linear threshold logic gates, with the PTTG one can build digital circuits more compactly. The proposed PTTGs are promising for future smart nanoscale digital system use.
85.35.Ds Quantum interference devices
Issue 49 (12 December 2007)
Received 15 August 2007, in final form 12 October 2007
Published 15 November 2007
Wancheng Zhang et al 2007 Nanotechnology 18 495201
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