CMOS Majority Circuit with Large Fan-In

Hisanao AKIMA  Yasuhiro KATAYAMA  Masao SAKURABA  Koji NAKAJIMA  Jordi MADRENAS  Shigeo SATO  

IEICE TRANSACTIONS on Electronics   Vol.E99-C   No.9   pp.1056-1064
Publication Date: 2016/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.1056
Type of Manuscript: PAPER
Category: Electronic Circuits
majority logic,  MOS analog circuits,  nonlinear circuits,  Monte Carlo simulation,  

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Majority logic is quite important for various applications such as fault tolerant systems, threshold logic, spectrum spread coding, and artificial neural networks. The circuit implementation of majority logic is difficult when the number of inputs becomes large because the number of transistors becomes huge and serious delay would occur. In this paper, we propose a new majority circuit with large fan-in. The circuit is composed of ordinary CMOS transistors and the total number of transistors is approximately only 4N, where N is the total number of inputs. We confirmed a correct operation by using HSPICE simulation. The yield of the proposed circuit was evaluated with respect to N under the variations of device parameters by using Monte Carlo simulation.