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一种基于符号逻辑的神经元模型和电路实现 总被引:3,自引:0,他引:3
为了实现基于符号逻辑的神经网络系统,本文定义了一种逻辑神经元模型,并采用了电流型CMOS工艺实现辽种神经元电路的各种逻辑功能,最后通过电路模拟,证明设计的正确性。 相似文献
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提出一种通过引入多值求和信号指导设计二值神经元MOS电路的方法.对每个神经元MOS管的逻辑功能均采用传输开关运算予以表示.在此基础上设计了实现常用二变量逻辑函数的神经元MOS电路和全加器等电路.采用所提出的方法综合得到的电路结构十分简单,而且很容易确定各耦合电容之间的取值比例.设计结果同时表明,利用浮栅电压信号易于实现求和的优点,通过引人求和辅助变量可显著简化对电路的综合过程.采用TSMC0.35μm双层多晶硅CMOS工艺参数的HSPICE模拟结果验证了所提出设计方案的正确性. 相似文献
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提出一种通过引入多值求和信号指导设计二值神经元MOS电路的方法.对每个神经元MOS管的逻辑功能均采用传输开关运算予以表示.在此基础上设计了实现常用二变量逻辑函数的神经元MOS电路和全加器等电路.采用所提出的方法综合得到的电路结构十分简单,而且很容易确定各耦合电容之间的取值比例.设计结果同时表明,利用浮栅电压信号易于实现求和的优点,通过引人求和辅助变量可显著简化对电路的综合过程.采用TSMC0.35μm双层多晶硅CMOS工艺参数的HSPICE模拟结果验证了所提出设计方案的正确性. 相似文献
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人工神经网络是现代信息处理领域的一个重要的方法。相对于软件实现 ,硬件实现方式能充分发挥神经网络并行处理的特点。用模拟电路实现神经网络电路形式简单、功耗低、速度快、占用芯片面积小 ,可以提高在神经网络芯片上神经元的集成度 ,神经元电路适合用模拟电路实现。文中综述了当前神经网络单元的模拟 VLSI实现的成果、新技术以及作者的工作成果。针对应用最广泛的线性和平方突触神经元 ,详细从权值存储单元、突触电路和阈值函数电路三方面来叙述。对各种实现方式的优缺点进行了比较 ,同时指出了神经网络实现电路中需要考虑的因素。最后 ,展望了用集成电路技术实现自学习神经网络的发展方向 相似文献
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共振隧穿器件应用电路概述——共振隧穿器件讲座(2) 总被引:1,自引:0,他引:1
在“共振隧穿器件概述”的基础上,对共振隧穿器件应用电路作了全面概括的介绍。首先对共振隧穿器件应用电路的特点、分类和发展趋势作了简述;进一步对由RTDH/EMT构成的单-双稳转换逻辑单元(MOBILE)和以它为基础构成的RTD应用电路,包括柔性逻辑、静态随机存储(SRAM)、神经元、静态分频器等电路的结构、工作原理和逻辑功能等进行了介绍。关于RTD/HEMT构成的更为复杂的电路,如多值逻辑、AD转换器以及RTD光电集成电路等将在本讲座最后部分进行讲解。 相似文献
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截断斜坡函数多值逻辑神经元 总被引:2,自引:0,他引:2
基于截断斜坡函数实现方便和多值逻辑变量信息含量高的特点,提出了一种多值逻辑神经元,并给出了相应的训练方法和电路实现方案.该神经元可应用于模式识别、降低神经元网络中的神经元数量和提高训练速度. 相似文献
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The Simuron (simulated neuron) is a distributed active element analogous to the neuron and has learning and oblivious mechanisms. Like the neuristor, it can be coupled by two types of junctions. This letter proposes frequency memory and logical memory circuits using the Simuron. 相似文献
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本文给出了一个专业基础课的设计问题结合思政内容的一个例子。多输出组合逻辑电路的设计是数字电路中的典型问题。通常情况下,多输出的组合电路通过设计每个单输出的组合电路来实现。但是,在这个问题中,仅仅考虑对每个输出函数的实现最佳优化,并不能实现总体的最佳;必须从实现总体最佳的角度考虑每个输出函数的实现问题。结合这一点,我们启发学生考虑集体利益和个人利益的关系,以及如何才能实现更好的集体利益。 相似文献
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An original approach to DC characteristic SPICE simulation for floating gate neuron MOS circuits is demonstrated. A novel macromodel which calculates the floating gate potential by combining resistances and dependent voltage and current sources is introduced. Utilising this method, DC characteristics for neuron MOS circuits have been confirmed to be successfully simulated using SPICE 相似文献
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Analog neuron circuits based on both frequency modulation and pulse modulation are investigated. The circuits are compared in terms of size, power, performance, and reliability; frequency modulation shows advantages in each area. Test circuits were designed and fabricated in 2µm CMOS technology. The frequency modulated neuron has an operational frequency of 3.125 MHz and a dynamic range of 17 bits. Our results indicate that this circuit technique may provide substantial advantages in high-performance, low-power neural systems. 相似文献
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Analog neuron circuits based on both frequency modulation and pulse modulation are investigated. The circuits are compared
in terms of size, power, performance, and reliability; frequency modulation shows advantages in each area. Test circuits were
designed and fabricated in 2μm CMOS technology. The frequency modulated neuron has an operational frequency of 3.125 MHz and a dynamic range of 17 bits.
Our results indicate that this circuit technique may provide substantial advantages in high-performance, low-power neural
systems. 相似文献
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电子电路故障诊断的新方法 总被引:3,自引:0,他引:3
本文提出了一种诊断大规模电子电路的子网络级故障诊断屏蔽方法,首先将电路撕裂成一定数目的子电路,在一定的激励条件下,依次对各子电路进行屏蔽,得到各子电路的逻辑诊断值或逻辑矩阵,最后用逻辑运算进行故障定位。 相似文献
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The authors present two nonlinear CMOS current-mode circuits that implement neuron soma equations for chaotic neural networks. They have been fabricated in a double-metal, single-poly 1.6 μm CMOS technology. The neuron soma circuits use a novel, highly accurate CMOS circuit strategy to realise piecewise-linear characteristics in the current-mode domain. Their prototypes obtain reduced area and low voltage power supply (down to 3 V) with a clock frequency of 500 kHz 相似文献
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Synchronization and chaos in coupled memristor-based FitzHugh-Nagumo circuits with memristor synapse
The memristor has drawn a significant interest in the fields of neuromorphic circuits because the nanoscale memristor is a strong candidate to become the critical element of novel ultra-high density low-power non-volatile memories. In the present paper, we focus on networks of FitzHugh-Nagumo neuron circuits employing memristor. First, we build the memristor-based circuit of FitzHugh-Nagumo model. The details of the chaotic phenomena of the memristor-based FitzHugh-Nagumo circuit under external stimuli have been found with use of computer simulations, i.e., we have numerically calculated waveform diagrams, phase portraits, Lyapunov exponents and bifurcation diagram. And we also confirm these results of theoretical analyses and numerical calculations by circuit simulation experiments of the actual analog circuit realization using Multisim modeling. Then the synchronization of coupled memristor-based chaotic neurons with memristor synapse is discussed, and synchronization mechanism is also found. Finally, we have also derived the sufficient conditions of chaotic synchronization in unidirectional coupled neuron circuits and bidirectional coupled neuron circuits respectively, which are that the parameter of memristor synapse must meet certain conditions. These results of theoretical analyses have been confirmed by numerical simulation. 相似文献