两种改进的电流型WTA电路

Two Modified Current Mode WTA Circuits

本文提出了一种结构简单灵活的多功能电流型WTA网络.它不仅具有较高的精度和可配置的能力,而且它还可以实现绝对拒识以及两种相对拒识.第一种相对拒识为在配置成2WTA网络时,它以各路输入电流的加权和作为相对阈值,因此它具有一定的自适应能力;第二种则作为通常的1WTA使用,如果最大输入电流与次最大输入电流相差小于一给定阈值或最大输入电流的一个百分比后便产生拒识.不管是绝对拒识或是相对拒识,这些功能在模式识别领域都有着很重要的作用.

A current mode novel multifunctional WTA network with smart structure is put forward in this paper.This network is reconfigurable with a high precision.It can also realize both absolute rejecting fuction and relative rejecting function.The weighted sum of all the input currents is regarded as a relative threshold in the first kind of relative rejecting when this network is configured in 2 WTA and so it has some adaptibility.If the difference between the first maximum and the second maximum input currents is less than a given value or a certain percentage of the first maximum input current,then a relative rejecting signal is given by the second kind of network.In this case,the network is usually used as a general 1 WTA.These two kinds of rejecting play an important role in the field of pattern recognition.HSPICE simulation of this network gives a good performance.