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电路研究
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  analysis of circuit
A Symbolic Pole/Zero Extraction Methodology Based on Analysis of Circuit Time-Constants
      
A failure analysis laboratory involved with the analysis of circuit cards faces the need for some form of automation.
      
Further analysis of circuit and module parasitics can be modeled and validated.
      
Initial analysis of circuit design can be started using non-linear steady-state techniques such as harmonic balance.
      
The models do not include Monte Carlo parameters so statistical analysis of circuit performance due to lot and device variation is not available.
      
  analysis of circuit
A Symbolic Pole/Zero Extraction Methodology Based on Analysis of Circuit Time-Constants
      
A failure analysis laboratory involved with the analysis of circuit cards faces the need for some form of automation.
      
Further analysis of circuit and module parasitics can be modeled and validated.
      
Initial analysis of circuit design can be started using non-linear steady-state techniques such as harmonic balance.
      
The models do not include Monte Carlo parameters so statistical analysis of circuit performance due to lot and device variation is not available.
      


In the investigation of a nonlinear forced RL-varactor circuit, it is discovered that besides the period-doubling route to chaos, the system has also the frequency locking ability to its subharmonics. A frequency entrainment diagram of the system is obtained experimentally in a large scale of parameters, with a structure not found in literatures. The simplest model of the varactor is used to simulate the system. The bifurcation diagram and the phase-space orbits obtained from the computer agree well with those...

In the investigation of a nonlinear forced RL-varactor circuit, it is discovered that besides the period-doubling route to chaos, the system has also the frequency locking ability to its subharmonics. A frequency entrainment diagram of the system is obtained experimentally in a large scale of parameters, with a structure not found in literatures. The simplest model of the varactor is used to simulate the system. The bifurcation diagram and the phase-space orbits obtained from the computer agree well with those taken from the experiments. The mechanism of the chaos appearance is also studied. Possible applications of some results are presented.

对一个受迫非线性RL-变容管电路的研究中发现,它除了具有周期倍增导致混沌的过程外,对次谐波还具有锁定能力。实验获得了它在大参数范围内的频率捕捉区,其结构特征在目前的文献中尚不多见。采用了变容管的一种最简单的模型,对该系统进行了数值模拟,所得分支图和相空间轨道与实验观测取得了很好的一致。作者对系统产生混沌的机制及其对某些应用的可能性提出了看法。

This paper is the conclusion of the receiver of the concord chinese pager model PG003C which had the honor to get the first class award of Zhuhai 94's science and technology advanced, We discuss the scheme of pager receiver circuit and antenna in this paper first.We point out the doudle loops small size antenna and the hererodyne receiver circuit have many merits,that's why we have used the doudle loops antenna and hererodyne circuit in mode1PG003C.Secend,we bring up the plan of the gains and noise figures assignment...

This paper is the conclusion of the receiver of the concord chinese pager model PG003C which had the honor to get the first class award of Zhuhai 94's science and technology advanced, We discuss the scheme of pager receiver circuit and antenna in this paper first.We point out the doudle loops small size antenna and the hererodyne receiver circuit have many merits,that's why we have used the doudle loops antenna and hererodyne circuit in mode1PG003C.Secend,we bring up the plan of the gains and noise figures assignment berween the different levels circuits inaccordance with SENSITIVITY.On another side,we have used the isolation technique which is often used in the satellite receiver to reject the interference of the image frequency.The model PG003C's performence is superior that had been approved by the Ministry of Post and Telecommunication's modile communication equipment's quality administration and examination center.

文中先根据以前市面上性能最优的Motorola顾问型中文机为目标,结合协和第一、二代中文寻呼机接收电路的研究成果,制定了自已产品的技术性能要求,对寻呼接收机电路和天线的方案进行了探讨,指出选用的双环天线的优点及其增益估算的方法,说明了选用二次变频外差式接收电路是为了保证有较高的灵敏度和批量生产的灵活性。接着从提高灵敏度的角度,对接收机各级电路的增益和噪声系数分配及LNA电路的确定进行了讨论。最后给出了PG003C接收机的具体实现以及检测结果

This paper presents the progress of very high speed circuits for optical communication systems. One of the key components, modulator driver integrated circuit, is described in detail.

总结了国内外光纤通信用高速电路研究最新进展,并详细讨论了其中的关键器件——光调制器驱动电路。

 
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