采用参数放大器，即可将噪声系数减至最低。
并且提出了平衡低噪声放大器噪声系数的测试方案。
The scheme of Noise Figure measurement best matched for this balanced LNA is proposed.
掺饵光纤放大器的主要性能是它的饱和增益特性和噪声系数。
The main performances of erbium doped fiber amplifiers are the saturated gain and noise figure.
本文给出了采用球形收敛枪的功率行波管噪声系数的计算方法。
This paper presents a method of calculation of the noise figure of power travelling wave tubes which employ a conical Pierce gun to produce the electron beam.
重点介绍应用新器件、新技术实现对雷达接收机噪声系数的测试。
The focal point is how to use new elements and new technology to accomplish measurment about noise coefficients of radar's receiver.
本文介绍了扩展噪声系数表hp 8970a测量频率范围的方法。
This article introduces the method of extending noise figure meter HP 8970a measurement frequency range.
最后还考虑了衬底电阻求解存以及在衬底电阻存在下的最小噪声系数。
Finally, we consider solving the existence of substrate resistance and substrate resistance in the presence of the minimum noise figure.
在不同乘法噪声系数情况下，计算了关联噪声驱动的双稳锯齿系统的逃逸率。
The escape rate of the bistable sawtooth system driven by correlated white noises in the different cases of multiplicative noise coefficient is calculated accurately.
论述了噪声系数分析仪的工作原理和噪声系数最基本的测量方法——Y因子法。
The noise factor analyzer's operation principle and the basic noise factor measurement method, Y factor method, are described.
本文介绍了具有噪声系数小，增益高，带内平坦的X波段低噪声放大器的设计。
This paper introduces some elements in the design of X-band low noise amplifer, and some items that must being noticed in the experiment.
所提出的检测器采用了一种结构来估计冲激噪声系数和修正非线性滤波器系数。
The proposed detector also incorporates a structure for estimating the impulsive noise parameter in order to update a filter parameter called the nonlinearity parameter.
同时，采用了较为精确的过剩噪声系数表达式，给出了灵敏度与暗电流的关系曲线。
In the meanwhile, with using more accurate expression of the avalanche excess noise factor, we give a relation schema between sensitivity and dark current.
总级联该接收机的噪声系数低至1.4分贝，可以帮助提供室内使用的敏感性增加。
The total cascaded noise figure of this receiver is as low as 1.4 dB that can help provide increased sensitivity for indoor use.
根据光接收机前端等效电路模型，建立了噪声系数与等效输入噪声电流谱密度的关系。
Based on the equivalent circuit model of a two-port optical receiver front-end, the relationship between the equivalent input noise current spectral density and the noise figure is analyzed.
给出了收发通过全“0”或全“1”移相状态下的幅相频率特性及噪声系数频率特性。
Some performances. such as amplitude-frequency, phase-frequency and noise-frequency in the case of"0"or"1 "phase status of transmit-receive channal are given.
本标准批准后即作为噪声系数3分贝以下低噪声精密测试时的“冷热源”专业技术标准。
This speciality standard will give a go-ahead for using as the reference of the cold and room-temperature microwave noise standard source below 3dB ultra-low-noise received system.
根据实验测量数据得到的噪声系数曲线与掺铒光纤放大器专用设计软件的数值模拟结果一致。
The NF curve obtained from the experimental data is in agreement with the numerical calculation results given by the special simulation software of EDFA Designer.
详细讨论了泵浦光功率、信号光功率、放大器长度以及光放大器增益对放大器噪声系数的影响。
The effect of pump power, amplifier length and signal gain on the noise characteristic of EYCDWA's are discussed.
为了获得高的灵敏度，本设计采用了噪声系数很低的前置放大器，并进行了可靠的接地、屏蔽等处理。
To achieve high sensitivity, the pre-amplifier with very low noise figure is adopted in the design, and reliable grounding and shielding processing are performed.
本文全面论述了微波通信接收系统的噪声来源和分类，并较详细地分析了噪声系数及网络的噪声特性。
In the paper, the source and sorting of noise in microwave communication receiving system is described; and noise coefficient and network noiseness are analysised in detail.
对低噪声放大器设计时，主要围绕正向功率增益、噪声系数、线性度、功耗等主要性能指标进行设计。
We designed the LNA according to the performance index of its forward power gain, noise figure, linearity, power consumption and so on.
经测试表明，依照该方法可以设计实现噪声系数极小的超低频放大器，且性能稳定可靠，符合设计指标要求。
The experiment shows that using this method we can realize a SLF low noise amplifier with stable performances and meeting design requirements.
接收射频前端的高增益和低噪声系数要求两级低噪放级联使用，通过计算低噪放的噪声估量确定了连接方式。
For the requirement of high gain and low noise figure (NF) of the receiver RF destination, two LNAs most be cascaded, which is determined by each noise calculation of the two different LNAs.
本文介绍了噪声系数的几种测量方法，重点分析了目前实际工程和研究中最常用的噪声系数测量方法—Y因子法。
Many emphases are put on analyzing Y-factor method which is the most widely-used noise figure measuring method nowadays in practical engineering and study.
对低噪声放大器的基本要求是：噪声系数低、足够的功率增益、工作稳定性可靠、足够的带宽和大的动态范围等。
The basic requirements of the LNA include: low noise figure, enough power gain, reliable work stability, sufficient bandwidth and the wide dynamic range.
微波、毫米波系统的噪声系数基本上取决于前级放大器的噪声系数，所以低噪声放大器是接收系统中相当重要的部件。
The noise figure of a microwave or millimeter-wave system basically lies on the noise of the front amplifier, so the Low Noise Amplifier (LNA) plays critical role for the receiving system.
本文讨论了常用的噪声系数测试方法—Y因子法中高频及中频衰减器本身失配和测试系统中其它部分的影响所造成的测试误差。
This paper discussed the error in the measurement of noise figure—The method of Y factor , The error is caused by mismatch of RF attenuater and IF attenuater and the others in the measurement system.
分别讨论了在理想假设和实际情况下超外差接收机的双边带噪声系数和单边带噪声系数，给出了单边带接收机的某些设计方案。
This paper discussed the double sideband noise figures and single side band noise figures of the superheterodyne receivers in a ideal hypothesis and the practical case respectively.
围绕超高速这一特点，对系统的相位噪声、接收机噪声系数、发射功率、系统门限接收电平等作详细的论证，以确定总体设计方案。
Round the feature of the ultrafast speed, make the detailed description of phase noise, receiver noise figure, launch power, threshold level of system.
围绕超高速这一特点，对系统的相位噪声、接收机噪声系数、发射功率、系统门限接收电平等作详细的论证，以确定总体设计方案。
Round the feature of the ultrafast speed, make the detailed description of phase noise, receiver noise figure, launch power, threshold level of system.
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