A High-Speed and Multi-Chip WTA/MAX Circuit Design Based on Averaged-Value Comparison Approach

Kuo-Huang LIN  Chi-Sheng LIN  Bin-Da LIU  

IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.10   pp.1724-1729
Publication Date: 2004/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
winner-take-all (WTA),  maximum (MAX),  averaged-value comparison,  multi-chip,  voltage comparison element (VCE),  

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This paper presents a voltage-mode WTA/MAX circuit that achieves high-speed and multi-chip features. Based on the efficient averaged-value comparison approach, the time and hardware complexities are proportional to O(log N) and O(N) respectively, where N is the number of inputs. In addition, a voltage comparison element (VCE) circuit is proposed to achieve multi-chip function. In the proposed circuit, the averaged-value calculator is built using resistor array that prevents the matching problem of transistor array. The whole circuit was fabricated with the TSMC 0.35 µm signal-poly quadruple-metal CMOS process. With eight input signals, the measurement results show that the proposed circuit resolved input voltages differing by 10 mV in 30 ns, and the multi-chip capability was also verified.