基于EWB软件的基本放大电路非线性失真分析

利用EWB软件进行电路仿真实验,研究基本放大电路出现的非线性失真的原因,提出消除非线性失真的方法.     

一种将静态电流与动态电流相结合的集成电路故障定位算法

本文提出了一种新的故障定位算法。该算法将静态电流诊断方法与基于小波分析的动态电流诊断方法相结合，并通过模式识别进行决策，实现可精确到电路元件的CMOS集成电路多故障定位。经过仿真实验证明，该算法的可行性和有效性。     

Multisim在静态工作点稳定电路分析中的应用

本文从固定偏置电路出发,首先通过Multisim温度扫描分析其温度稳定性较差的原因,然后通过引入电流串联负反馈,分析射极偏置电路工作点的稳定性及动态性能的变化。为了在稳定静态工作点的同时兼顾动态性能,基于Multisim,对完全旁路电路和部分旁路电路进行比较分析。同时,利用交流分析功能,对引入反馈前后的通频带变化进行比较,最终使学生对静态工作点稳定的过程有了深入的理解。     

Spider Mites Assess Predation Risk by Using the Odor of Injured Conspecifics

When a predatory mite, Amblyseius womersleyi is present, Tetranychus kanzawai takes refuge on its webs during a quiescent stage. To examine the factors responsible for the antipredator behavior of T. kanzawai, we exposed T. kanzawai to the odor of conspecifics, A. womersleyi, and both T. kanzawai and A. womersleyi. The proportion of T. kanzawai females that took refuge was significantly higher when they were exposed to the odor of `both T. kanzawai and A. womersleyi.' Furthermore, the proportion of T. kanzawai females that took refuge was significantly higher when they were exposed to injured conspecifics than to intact conspecifics. These results suggest that T. kanzawai assesses predation risk, at least in part, by using the odor of injured conspecifics.     

一种分高低压供电的低压差线性稳压器的设计

针对传统低压供电的低压差线性稳压器线性响应比较慢的情况,提出了一种基于BICMOS 0.5μm工艺分高低压供电的低压差线性稳压器。经过Hspice仿真验证,该稳压器具有高增益、高PSRR（Power Supply Rejection Ratio,电源抑制比）、低功耗、响应速度快的特点,输入电压范围为0.5~28.0 V,输出电压为5 V。此稳定器低频时的开环增益达到86 dB,相位裕度为68o,低频时的电源电压抑制比为–91 dB,高频时也能达到–2 dB,静态电流只有13.5μA。     

基于Multisim 10的单管共射放大电路静态分析

静态工作点是"模拟电子技术"课程中的教学重点,也是教学难点。利用仿真Multisim 10软件,对共发射极基本放大电路进行静态仿真测试分析,使学生在基本放大电路的学习中对静态工作点的概念、静态工作点对放大电路的重要性和必要性有比较清晰正确的理解,对共发射极放大电路在不同工作情况下的特点有一个比较全面的认识。研究表明,利用Multisim 10强大的分析功能对电子电路进行计算机仿真,可以提高教学质量和教学效果。     

室温锑化铟在探测器阵列靶中应用问题研究

锑化铟探测器阵列靶是红外激光光斑测量的重要仪器。仪器中的光导型锑化铟探测器对温度比较敏感,这容易使后级信号处理电路的静态工作点出现温度漂移现象,影响阵列靶探测精度。针对这一情况,设计了一个可以根据环境温度实时调整静态工作点的系统,有效地解决由于探测器静态阻值随温度变化而引起的静态工作点的漂移问题,为室温锑化铟红外探测器在各种环境下的应用提供了一套有效的解决方案。     

Quantitative and temporal analysis of effects of twospotted spider mite (acari: Tetranychidae) female sex pheromone on male guarding behavior

Responses of male twospotted spider mite,Tetranychus urticae (Koch), to female sex pheromone were described by a glass slide bioassay and computerized pathway digitizer. Pheromone was extracted from quiescent deutonymphs and fractionated by HPLC, and responses of guarding males to each fraction, all fractions combined, unfractionated extract, and a hexane control were bioassayed for 6 min. Mean angular velocities, linear velocities, percent time stationary, and distance from the 3-mm-diameter treatment circle were calculated for each mite at 20-sec intervals and these behavioral parameters regressed on time. Analysis of variance of regression-equation intercepts showed that no differences in initial male angular velocities were observed among treatments, but initial linear velocities were greater in response to all fractions combined and to extract than to individual fractions, and greater in response to individual fractions than to the control. Angular velocities decreased and linear velocities increased more rapidly in response to individual fractions than to all fractions combined and extract, while males turned preferentially in one direction and were stationary (no displacement) more often in response to all-fraction combinations than to individual fractions and the control. Significant differences were observed among the parameter values elicited by individual fractions, suggesting that active fractions differed qualitatively. The described changes in movement parameters show that maleT. urticae response to presence of pheromone occurs almost immediately, and that multiple pheromonal components are necessary to elicit maximum male response. The overall effect of pheromonal components was to decrease the rate at which males moved away from the treatment cycle, thereby causing male arrestment.     

基于神经网络的三极管温度特性模型研究

温度对三极管的性能影响较大,使得电路中的静态工作点出现不稳定现象．采用神经网络技术分析实际环境温度对三极管放大特性的影响,并通过实测数据和利用线性均差法得到的数据建立三极管温度特性的神经网络模型．利用该模型可预测温度对放大倍数的影响,掌握电路系统的温度漂移．从而为优化系统性能提供设计依据．