Inducing Chaos in MOSFET-Based Electronic Circuits

We construct a nonlinear, MOSFET-based electronic circuit and address the question of inducing chaos. A recently proposed method makes use of resonant perturbations, which is applicable to situations where chaos is desired, under the following three constraints: (1) the circuit operates in a stable periodic regime, (2) no parameters or state variables of the circuit are directly accessible to adjustment, and (3) the circuit equations are not available. We argue that phase-locked loops can be utilized to realize resonant perturbations in terms of frequency and phase match, and demonstrate experimentally that chaos can be induced in the MOSFET circuit.     

通信电子电路中的LC并联谐振回路

LC并联谐振回路是通信电子电路中常用的单元电路。通过电路分析得出它的幅频特性与相频特性,认为它在通信电子电路中的应用主要有三种类型,即放大器的选频匹配网络、反馈式正弦波振荡器的选频反馈网络、调制与解调电路中的幅频变换及频相转换器件。     

Resonant Properties of Nonreciprocal Ring Circuits

The ring circuit investigated consists of a resonant ring guide coupled to a main guide. The properties can be described by the equations for the waves in the ring guide resulting from excitation in the main guide. The influence of nonreciprocity on the properties is investigated under conditions of varying coupling. The representation of the ring waves by the poles and zeros is chosen to permit interpretation of the results under the large variety of operational conditions with respect to coupling and nonreciprocity. The application for measuring the material constants of ferrites is discussed.     

Integrated Circuits of Map Chaos Generators

A chaotic noise is one of the most important implements for information processing such as neural networks. It has been suggested that chaotic neural networks have high performance ability for information processing. In this paper, we report two designs of a compact chaotic noise generator for large integration circuits using CMOS technology. The chaotic noise is generated using map chaos. We design both of the logistic map type and the tent map type circuits. These chaotic noise generators are compact as compared with the other circuits. The results show that the successful chaotic operations of the circuits because of the positive Lyapunov number. We calculate the Lyapunov exponents to certify the results of the chaotic operations. However, it is hard to estimate its accurate number for noisy data using the conventional method. And hence, we propose the modified calculation of the Lyapunov exponent for noisy data. These two circuits are expected to be utilized for various applications.     

Broadband Matching of Resonant Circuits and Circulators

In the first part of this paper a broadband matching theory of resonant circuits is developed. It is not assumed that the center frequency of the matching interval is equal to the resonance frequency of the resonant circuit. The upper limits of optimum broadband matching are derived with the aid of Fano's integrals. Furthermore it is shown how we can approach these ripper limits as well as desired with real matching two-ports with Chebyshev response. This broadband matching theory of resonant circuits may be applied to circulators if the input impedances of the circulators can he represented approximately by resonant circuits. This problem is treated in the second part of the paper.     

Theory and Measurement of Q in Resonant Ring Circuits

The loaded and unloaded Q of a resonant ring circuit are derived on the basis of the fundamental definition. Simple experiments are described to measure Q/sub 0/, Q/sub L/, and the ring power gain without additional coupling to the ring. A number of graphs are given which are useful for these measurements.     

模拟电路在电子测量技术中的应用

本文介绍了在电子测量技术中应用模拟电路的三个实例,即带有极性显示(红绿灯)的交直流两用电子电压表电路、测量直流电流的电流一电压变换器、测量电阻的线性刻度欧姆表.对它们各自的测量原理进行了简单明了的说明.     

Nonlinear Resonant Circuits for Microwave Low Power Limiters

The letter comprises an analysis of nonlinear coupled resonant circuits for application in limiting low power microwave signals. It presents a novel approach to the use of the resonant circuit containing a nonlinear element which concerns obtaining power dependence of the quality factor and transmission losses without tuning resonant frequency. The basic theory of the single circuit is presented and examples provided of simulations in Microwave Office and measurements results of the designed two-stage limiter. The effect of transforming the input signal amplitude causes this type of circuit to be power-sensitive and allows to limit low power signals.     

电子电路中抗EMI设计

电磁干扰(EMI)可分为传导干扰和辐射干扰,消除干扰的方法可以采用硬件方法和软件方法,硬件方法主要有屏蔽、接地、隔离和滤波等,而软件方法主要是滤波。笔者对各种方法进行总结,并指出各种方法所存在的问题以及适用场合,并对一些常用方法提出改进措施。     

谈谈谐振电路的教学

根据作者的教学经验，从电磁振荡的角度讲解谐振的物理意义，以能量转换的观点给出串联谐振和并联谐振电路的品质因数Q值统一定义，是提高谐振电路教学质量的有效做法。     

关于印制电子电路工业园

文章概述了建立印制电子电路工业园的重要意义与好处。其优点主要有两个方面——改善“节能减排”和促进“技术创新”发展。     

谐振电路品质因数的计算

品质因数是谐振电路中一个非常重要的参数,本文讨论了一般RLC电路谐振时品质因数的计算问题,给出了一般RLC电路谐振时品质因数的简单计算方法,即先计算端口的阻抗或导纳,得到等效的串联或并联电路的R、L、C参数,然后套用串、并联谐振电路的品质因数计算公式即可.作者从品质因数的原始定义入手,说明了根据原始定义计算的品质因数与按照本文给出的方法计算的品质因数计算公式是一致的,从而证明了该方法的正确性.     

具有电或磁耦合关系谐振电路的谐振频率

采用本征值理论分析与电路仿真两种独立的方法,定量计算了具有电耦合或磁耦合关系谐振电路的谐振频率随耦合电容或耦合系数大小的变化关系,两种耦合电路的谐振频率表现出不同的变化规律。这种耦合谐振电路的分析为实际电路设计过程中利用耦合类型及耦合强度对谐振频率进行调谐开辟了新的途径,扩展了现有教学中无耦合谐振电路的教学内容。     

PSpice在高频电子线路中的应用

PSpice软件是目前应用最广的电子线路仿真软件，他可以根据电路的结构和元器件参数对电路进行仿真分析，从而可以方便、精确地判断电路设计的正确性。本文介绍了PSpice软件的功能和特点，利用PSpice对包络检波器进行了仿真，并对包络检波器的两种特有失真（惰性失真和负峰切割失真）进行了观察和分析。通过这一实例较详细地说明如何用PSpice软件对高频电子电路进行仿真与性能分析。从而为高频电子线路的设计和教学提供了一个新的途径。     

LabVIEW在电子线路实验教学中的应用

针对目前电子线路实验教学中存在的问题,结合实例介绍了LabVIEW和虚拟仪器技术在电子线路实验教学中的特点和优势。利用LabVIEW构建虚拟仪器和实验,弥补了传统实验设备的不足,加大了实验室现有资源的利用,达到了改善实验条件、提高教学质量的目的。同时,将虚拟实验与传统实验相结合的教学方法使教学更生动,有利于促进学生自主学习和创新能力的培养。     

电路的任意节点状态的机助分析

文中介绍了一种直接求解任意一节点电压的方法,并讨论了其机助分析问题,给出了两种实现方案.     

共振隧穿器件应用电路概述——共振隧穿器件讲座(2)

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。     

对偶原理在电力电子电路中的应用

对偶原理是分析电力电子电路拓扑结构的有力工具。本文根据图论中图的对偶概念,对电力电子电路进行了对偶性分析,介绍了电力电子电路对偶变换的方法。由于对偶原理只适用于平面电路,本文还通过新的概念定义以及适当的变换方法将对偶原理的应用扩展到了非线性电力电子器件与非平面电路中。文中最后举例说明了对偶原理在电力电子拓扑结构中的重要作用。