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INTRODUCTIONRecently ,thehighfrequencyperformanceofCMOShavebeenimprovedsignificantlyinthelowgigahertzfrequencybands,makingitagoodcandidatefortheintegrationofbothdigitalandanalogchips.However,performances,suchasnoiseandlinearitycharacteristics,mustbeana ly… 相似文献
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唐学锋 《湖州师范学院学报》2012,34(1):53-56
基于0.18μm CMOS工艺,采用共源共栅源极电感负反馈结构,设计了一个针对蓝牙接收机应用的2.4GHz低噪声放大器(LNA)电路.分析了电路的主要性能,包括阻抗匹配、噪声、增益与线性度等,并提出了相应的优化设计方法.仿真结果表明,该放大器具有良好的性能指标,在5.4mW功耗下功率增益为18.4dB,噪声系数为1.935dB,1dB压缩点为-14dBm. 相似文献
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Guoxuan Qin Mengmeng Jin Guoping Tu Yuexing Yan Laichun Yang Yanmeng Xu Jianguo Ma 《天津大学学报(英文版)》2017,23(2):168-175
A 0.18 μm CMOS low noise amplifier(LNA) by utilizing noise-canceling technique was designed and implemented in this paper. Current-reuse and self-bias techniques were used in the first stage to achieve input matching and reduce power consumption. The core size of the proposed CMOS LNA circuit without inductor was only 128 μm 9226 μm. The measured power gain and noise figure of the proposed LNA were 20.6 and 1.9 dB,respectively. The 3-dB bandwidth covers frequency from 0.1 to 1.2 GHz. When the chip was operated at a supply voltage of 1.8 V, it consumed 25.69 mW. The high performance of the proposed LNA makes it suitable for multistandard low-cost receiver front-ends within the above frequency range. 相似文献
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设计了一个可用于低中频GPS接收机系统的1.575 GHz的低噪声放大器.首先考虑了ESD保护二极管和焊盘的寄生效应,对输入匹配和噪声性能的优化做了分析,并将窄带电感模型用于电路设计优化.其次基于Vol-terra级数,对放大器的非线性做了分析,推导了电路各参数与,IIp3的关系表达式,据此在功耗和线性度之间做了折衷考虑.采用TSMC 0.18μm射频工艺对低噪声放大器进行设计和仿真.仿真结果表明:在1.8 V工作电压下,噪声系数仅为1.1 dB,IIP3为-8.3 dBm,电流消耗3 mA,电路的输入匹配良好. 相似文献
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陆伟艳 《南宁师范高等专科学校学报》2008,25(4):119-120
低噪声放大器是射频前端的关键部件。针对超宽带低噪声放大器实际应用中对带宽、增益、噪声等要求,文中基于多级反馈技术,用AglientEDA工具ADS进行全面的仿真分析和优化设计。测试结果表明,实际测得的指标能与仿真结果较好的吻合．实现了一种较好的超宽带、低噪声、带内平坦度好和良好端口匹配的高效宽带放大器。 相似文献
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基于Jazz工艺,提出一种线性可控全集成Si Ge Bi CMOS驱动放大器（DRA）,实现多种可调功率增益放大作用。电路采用全差分共射共基结构,通过调节CMOS电流镜偏置电路和Si Ge-HBT管尺寸以及3bit控制位,实现1d B步长的可控增益。仿真结果显示：在10μA的带隙基准电流源以及3.3V的电源电压下,DRA实现八种可调功率增益,其线性度指标即输出1d B压缩点OP1d B〉3d Bm,电路供电电流〈10m A,且电路输入输出匹配良好（S11与S22均小于-19d B）。 相似文献
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Based on the characteristic curve analysis, the method using Δ(K 2) square difference of meter factor at different flow rates was developed to evaluate the performance of turbine flow sensor in this study. Then according to the distribution of entrance velocity, it was supposed that reducing the blade area near the tip could decrease the linearity error of a sensor. Therefore, the influence of different blade shape parameters on the performance of the sensor was investigated by combining computational fluid dynamics(CFD)simulation with experimental test. The experimental results showed that, for the liquid turbine flow sensor with a diameter of 10 mm, the linearity error was smallest, and the performance of sensor was optimal when blade shape parameter equaled 0.25. 相似文献
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针对功率MOSFET关断时寄生参数对死区时间的影响问题,基于SIMPLIS仿真软件和MOSFET的特点,建立MOSFET的仿真分析模型,并研究MOSFET寄生参数与电路中米勒平台及关断时间的关系。建立MOSFET的寄生电容分段线性模型,应用Matlab软件实现参数的对比分析,根据内部器件的工作原理确定其转移特性和输出特性,利用图像数据获取MOSFET的等效模型,采用MOSFET搭建LLC谐振变换器电路,通过不同条件下的仿真实验,得到寄生参数的影响规律。一系列的仿真训练能够有效提高学生的仿真实践能力。 相似文献
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A differential cross-coupled regulated cascode(RGC)transimpedance amplifier(TIA)is proposed. The theory of multi-stage common-source(CS) configuration as an auxiliary amplifier to enhance the bandwidth and output impedance of RGC topology is analyzed. Additionally, negative Miller capacitance and shunt active inductor compensation are exploited to further expand the bandwidth. The proposed RGC TIA is simulated based on UMC 0.18 μm standard CMOS process. The simulation results demonstrate that the proposed TIA has a high transimpedance of 60.5 d B?, and a-3 d B bandwidth of 5.4 GHz is achieved for 0.5 p F input capacitance. The average equivalent input noise current spectral density is about 20 p A/Hz~(1/2) in the interested frequency, and the TIA consumes 20 m W DC power under 1.8 V supply voltage. The voltage swing is 460 m V pp, and the saturation input current is 500 μA. 相似文献
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Multilayered word structure model for assessing spelling of Finnish children in shallow orthography 
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下载免费PDF全文 This study explores Finnish children's word‐level spelling by applying a linguistically based multilayered word structure model for assessing spelling performance. The model contributes to the analytical qualitative assessment approach in order to identify children's spelling performance for enhancing writing skills. The children (N = 105) participated in two dictation assessments at the end of their first and second grades. The results indicate that long consonants and consonant sequences are the most problematic structures in both the first and second grades. The less‐advanced spellers were significantly weaker than others also in coding the overall syllable number, heavy unstressed syllables and long vowels in the first grade. In the second grade, they still had more difficulties in spelling heavy unstressed syllables and long quantities of vowels and consonants. The multilayered word structure model seems to give more information about the quality of spelling than error‐based holistic analyses. The model is applicable for other shallow orthographies as well. 相似文献
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随着集成电路工艺的不断革新,集成电路器件的尺寸不断减小,当MOS管的尺寸小到一定程度时,会出现短沟道效应,此时MOS管特性与通常相比有很大不同。本文介绍了描述短沟道MOS管特性的一些公式,然后利用硬件描述语言VHDL-AMS对短沟道MOS管进行了行为建模,并利用混合信号仿真器SMASH5.5对模型进行了仿真,将短沟道MOS管模型特性与一般模型特性作了比较。 相似文献
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Thelevel of vibration and noiseis animportant estima-tionindexoninternal combustionengines .As vibrationandnoise legislations are continually introduced and progres-sivelyrestricted,lowerlevel noise becomesincreasinglyim-portant .The traditional design pe… 相似文献
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In this paper, the iterative learning control problem is considered for a class of remote control system over wireless network
communication channel. The control performance of remote iterative learning control (R-ILC) system is analyzed and an error
boundary of the stable output of the R-ILC system is obtained for the boundary stochastic noise channel. Finally, we obtain
some rules to reduce the fluctuation caused by wireless channel noise through the analysis results for fluctuation boundary.
The simulation results prove the proposed rule is correct. 相似文献
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介绍了回声消除器的基本结构、回声路径的脉冲响应以及语音信号的特点,分析输入信号为白噪声、有色噪声和语音的情况下自适应算法的性能,在此基础上应用一种参数筛选更新归一化最小均方差(NLMS)算法以及基于互相关的双边对话侦测算法,并提供详细仿真结果。 相似文献
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梅妍砒 《扬州职业大学学报》2011,15(3):37-40
根据地球站天线增益、天线效率、系统噪声温度以及降雨衰减对卫星链路性能影响的公式,开发了基于VB6．0的降雨衰减对卫星链路性能影响的仿真软件,基于此仿真软件,做了一系列Ka频段降雨衰减对卫星链路性能影响的模拟实验,通过对仿真结果的分析,探讨了雨衰对卫星链路的影响、功率控制策略等问题。 相似文献
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建立了以太无源光网络接受机的行为模型,该模型包括光纤、光电探测器、跨阻放大器、限幅放大器及时钟和数据恢复电路.模型中各部分都是利用电路结构和行为特性来进行建模的,同时也对它们的噪声和抖动进行了建模,如散粒噪声、热噪声、确定性抖动和随机抖动.由于使用了行为模型,仿真速度比普通电路模型更快,同时比解析模型更准确.整个模型用C + +语言描述,在Microsoft Visual C + +6.0 中进行实现,并利用蒙特卡洛方法对系统仿真.最后建立了测试环境对模型进行验证,结果表明仿真结果与实验结果有较好的一致性. 相似文献
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Jie ZHANG ;Guang-xu HAN ;Xin-biao XIAO ;Rui-qian WANG ;Yue ZHAO ;Xue-song JIN 《浙江大学学报(A卷英文版)》2014,(12):1002-1018
研究目的：研究高速列车车轮多边形特征对轮轨噪声和车内噪声的影响规律,讨论目前国内高速列车车轮镟修指标的不足,为高速列车车轮镟修方法的优化改进提供科学依据。创新要点：系统分析高速列车车轮多边形阶次、幅值和相位等参数对车内噪声的影响规律;提出车轮镟修中仅考虑车轮径跳作为限值是不够的。研究方法：1．基于线路试验,初步分析高速列车车轮多边形状态对车内噪声的影响,进而对车轮多边形特征进行剖析;2．基于带通滤波和快速傅里叶变换,使用MATLAB程序生成不同阶次、幅值和相位的车轮多边形粗糙度数据;3．基于TWINS轮轨噪声原理,使用HWTNS预测含有不同车轮多边形特性的轮轨噪声;4．基于混合有限元-统计能量分析（FE—SEA）方法,建立高速列车客室端部车内噪声预测模型,预测车内噪声;5．通过分析车轮多边形参数、车轮径跳和车内噪声之间的相互关系,研究目前的高速列车车轮镟修指标是否合适。重要结论：1．高速列车车轮径跳值相同,但车轮多边形状态不同时,轮轨噪声与车内噪声有明显差异;2．当车轮多边形幅值相同时,高阶多边形可以引起更高的轮轨噪声和车内噪声;3．改变车轮多边形的相位,可以获得不同的车轮径跳值,但是对轮轨噪声和车内噪声几乎没有影响。 相似文献
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This series of simulation studies evaluate, in the context of applied research settings, the impact of the parameterization of the covariance structure of the growth mixture model (GMM) on the regression coefficient and standard error estimates in the 3-step method. The results show that the 1-step approach performs better than the 3-step method across the simulation studies. However, the performance of the 3-step method depends slightly or importantly on the parameterization of the GGM from the first step, on the inclusion or not of the predictor at the first step of the analysis, on the population model, and on the type (i.e., logit vs. linear) and size of the regression coefficient estimates. 相似文献