基于MutiSIM的蔡氏混沌序列仿真研究

混沌序列是非线性方程描述的确定系统所产生的介于周期振荡与噪声之间的一种复杂振荡序列.蔡氏电路是一个经典,且简单的三阶自治系统,能够产生丰富的混沌现象。在对蔡氏电路进行数学建模的基础上,采用MultiSIM仿真软件对其进行仿真,并分析其产生的混沌信号的功率谱,从而找出一个最佳的电路参数,得到一个最好的,可用的混沌序列。     

PIN管控制电路功率容量的确定

PIN管控制电路的功率容量是一个重要的电路参数，必须全面考虑PIN管本身的功率容量和电路结构形式、施加的反向偏置电压、射频信号的频率和形式以及电路在系统中的匹配状况、工作环境和可靠性要求等各项因素综合确定。分析了对影响电路功率容量确定的各种因素，介绍了在射频系统中PIN管控制电路功率容量确定的综合方法。     

半导体激光器驱动电路的光功率控制的研究

介绍了数字控制式半导体激光器驱动电路的设计，包括温度控制系统和光功率控制系统。该系统以单片机为核心，结合外围电路，以数字控制技术代替以往的模拟电路，易于控制，精度高。对光功率控制系统也以单片机为核心，配合外围的功率采样电路和电流驱动电路．同时使用PD控制算法，控制电源电流，从而控制激光器光功率输出。在PD参数整定时，采用了工程实验法多次实验调试确定参数。建立数学模型，从而实现软件控制。为了提高控制的精度，把功率范围分为9段，对每一段都整定了一组参数，从而将光功率误差控制在0．02W内。所设计的驱动电路精度高，实时性好，达到了设计要求。     

一种基于带隙比较器的过热保护电路

设计了一种基于带隙比较器的过热保护电路。该电路可用于功率集成电路和电源管理芯片中。采用0.6μmBiCMOS工艺对电路进行了仿真。结果表明,该电路对温度灵敏度高,关断和开启温度点受电源电压和工艺参数变化的影响很小。通过比较器的迟滞功能防止了热振荡现象的发生。     

大功率半导体激光器调制特性的实验研究

设计了一种带有调制输入接口及恒电流、恒功率、恒温控制的光源系统,着重对其低频调制特性进行了实验研究.通过引入负反馈及自动温度控制技术,从外部电路角度改善了半导体激光器的调制输出特性,有效抑制了驰豫振荡,优化了激光二极管(LD)的调制输出参数.     

功率MOSFET参数测试仪的设计

功率MOSFET参数测试仪是用来测试功率MOSFET电特性参数的仪器设备（如阈值电压、跨导等）。以单片机为核心，介绍功率MOSFET参数测试仪的原理、设计及实现，设计了电特性参数测试的具体电路，编写了测试控制程序，通过对设计出的测试仪系统进行实验和调试，可以准确测量功率MOSFET的阈值电压、跨导、栅源漏电流、零栅压漏极电流及耐压。     

基于变压器隔离的功率MOSFET驱动电路参数设计

介绍了基于单电容变压器隔离及双电容变压器隔离的功率MOSFET驱动电路,并对驱动电路中各元器件的参数设计进行了详细的论述。进一步对所提出的设计方法进行了实验验证,实验结果表明该设计方法是合理有效的,驱动波形平滑无振荡,并且有较快的上升时间。     

基于对数比率放大电路的光功率测量

光功率测量是光纤通信系统最基本的测试参数之一。本文提出一种基于对数比率放大电路的光功率测量方法，相对于线性放大电路具有控制简单、动态范围大和线性度好的优点，是光缆在线监测的最佳选择。     

非线性振荡与混沌现象

本文用多项式简化运算放大器的输入特性，建立RLC非线性振荡电路的状态方程，并借助MATLAB软件进行分析计算，从计算结果中精选典型的相图与时域图，证明了二阶非线性RLC电路中，参数的变化最多只可能使正弦振荡转化为间歇振荡，而三阶非线性RLC电路中，参数变化则可能导致混沌现象。     

一种带热滞回功能的过热保护电路

由于功率集成电路功率耗散比较大,发热量也大,因此,过热保护电路对于功率集成电路是非常重要的。文章介绍了一种用于集成电路内部的带热滞回功能的过热保护电路。电路不使用齐纳二极管和迟滞比较器,通过简单的反馈,防止了热振荡现象的发生。     

Chaos Synchronization in Complex Oscillators Networks with Time Delay via Adaptive Complex Feedback Control

This paper investigates the problem of chaos synchronization in complex oscillators networks. An adaptive complex feedback controller is designed to realize chaos synchronization in complex oscillators networks. The adaptive complex feedback controller consisting of real part controller and imaginary part controller. The real part controller and the imaginary part controller control the real part system and the imaginary part system of complex oscillators system of complex dynamical networks, respectively. Chaos synchronization in complex oscillators networks with constant delay and chaos synchronization in complex oscillators networks with time-varying coupling delay are researched. Finally, the numerical simulations show the effectiveness of theoretical analysis.     

Integration spannungsabstimmbarer Oszillatoren für Mobilfunkanwendungen

The frequency concepts of GSM and DECT systems in mobile handsets consist mainly of three voltage controlled oscillators. The goal of this work is the integration of these oscillators with a bipolar technology. In this paper the requirements for the oscillators are shown. The possibilities of integration are examined theoretically and by experiment. For the GSM system a partly integrated solution is demonstrated and for the DECT system a fully integrated VCO is presented.     

基于注频锁相技术的发射波束形成系统

研究了利用注频锁相技术实现低成本、高集成度、高效率的发射波束形成系统。首先介绍了发射波束形成的原理,并研究了注频锁相振荡器相位系统平衡点的稳定性,根据注频锁相振荡器的相位噪声理论给出了注频锁相振荡器阵列的设计原则,然后根据理论分析设计了一种可以产生高稳定度、低相位噪声具有任意相位加权系数的多通道射频相干信号的波束形成系统,利用计算机仿真该系统实现了发射波束扫描,证明了基于注频锁相技术的发射波束形成系统的可实现性。最后搭建了四通道注频锁相振荡器阵列,测量结果表明注频锁相振荡器阵列可以产生具有任意相位加权系统的多通道相干信号,进一步证明了该发射波束形成系统的有效性。     

Measurement of AM Noise in Pulsed Oscillators and Amplifiers

The noise properties of amplifiers and oscillators are critical in systems applications. This paper describes a system for the measurement of AM noise in amplifiers and oscillators pulsed on for durations on the order of a microsecond or less. Such a system is useful in measuring AM noise in pulsed solid-state microwave devices such as avalanche- and Gunn-diode simplifiers and oscillators, where heat-dissipation limitations sometimes make continuous operation impossible.     

Transient processes under stochastic synchronization of oscillators in colored-noise medium

Equations that describe mutual and induced chaotic synchronization of n (n = 2, 3, 4,...) autooscillation systems in colored-noise medium are derived. It is demonstrated that external colored noise acting upon a system of coupled oscillators and a chain of unidirectionally coupled oscillators causes a decrease in the duration of transient processes that lead to the chaotic synchronization (both mutual and induced) of nonidentical oscillators and a decrease in the time needed for stabilization of the symmetric state of the system when the parameters of oscillators are identical.     

Canonic coupling of sinusoidal oscillators

The problem of coupling between oscillators is usually tackled by employing the Van der Pol equation for representing the oscillators and solving the equations approximately. The present communication suggests another well-known oscillator and simple coupling factors for modeling the system. As a result, the system equations become directly integrable without approximations. The problem of the coupling of two oscillators is solved comprehensively and several regions of distinct dynamic behavior of the system and bifurcation points are identified.     

Phase and Frequency Transfer Between Mutually Synchronized Oscillators

Accurate phase and frequency transfer between mutually synchronized oscillators is a problem of current interest. This paper addresses a system of two mutually synchronized oscillators with inherently sinusoidal phase detectors. The system is studied in the context of nonlinear phase-locked loop theory. This is accomplished by Statistically characterizing the "time" and "space and time" increments of the phase processes generated by the two oscillators. The characterization of these increment processes is obtained in the form of steady-state probability density functions (pdf's). The effects of such disturbances as noise, transmission path delays, and oscillator frequency instabilities on the system are studied through their effects on these pdf's. Gaussian approximations for these pdf's (which simplify the extraction of the effects of the disturbances on the system) are also developed. Additionally, the stability of the time intervals and time interval errors generated by the oscillators are studied in the context of cycle slipping phenomena.     

A network of electronic neural oscillators reproduces the dynamics of the periodically forced pyloric pacemaker group

Low-dimensional oscillators are a valuable model for the neuronal activity of isolated neurons. When coupled, the self-sustained oscillations of individual free oscillators are replaced by a collective network dynamics. Here, dynamical features of such a network, consisting of three electronic implementations of the Hindmarsh-Rose mathematical model of bursting neurons, are compared to those of a biological neural motor system, specifically the pyloric CPG of the crustacean stomatogastric nervous system. We demonstrate that the network of electronic neurons exhibits realistic synchronized bursting behavior comparable to the biological system. Dynamical properties were analyzed by injecting sinusoidal currents into one of the oscillators. The temporal bursting structure of the electronic neurons in response to periodic stimulation is shown to bear a remarkable resemblance to that observed in the corresponding biological network. These findings provide strong evidence that coupled nonlinear oscillators realistically reproduce the network dynamics experimentally observed in assemblies of several neurons.     

测控系统中振荡器短稳对测速精度的影响

本文采用时域分析方法得到了测速误差与测控系统中各振荡器短稳的关系式，分析与工程实践的结果说明，测速误差不仅与频标源的短稳有关，而且与系统中各相干本振的附加相位噪声有关，在工程研制中，必须合理地分配各振荡器的短稳指标并减小其短稳损失，才能获得高的测速精度。     

W波段低成本数字通信系统

在毫米波频段,由于振荡器的频率漂移很大,常常采用锁相源,使系统成本大大增加.本文采用频率跟踪方案,实现了W波段数字通信系统,并详细描述了系统的关键技术.对8448kbit/s的数字通信实验表明,该系统的门限电平比采用锁相源的系统仅差3dB.该系统方案简单,成本大大降低.实验还表明,该方案中锁相环的采用没有对解调波形产生明显影响.