摘要翻译：
研究了无功负荷对放大的影响。采用简化的共射极电路结构，得到了与时间无关和时间相关的电压和电流方程。由于非线性，无法使用相量分析，电容上的电压用相应的积分表示，这意味着一种数值方法。首先研究了纯阻性负载的影响，发现晶体管等值线的扇形结构会严重扭曲放大，尤其是在V_A_A_+小和S_A_+大的情况下。发现总谐波失真与$V_A$无关，而是由$S$和负载电阻$R$决定。给出了电流增益与基极电流的关系式，表明电流增益与$I_b$几乎成线性关系。值得注意的是，在不超过最大功耗极限的情况下，当$r=0$时，没有增益变化，因此获得了完美的线性放大。容性负载意味着电路轨迹从直线向“椭圆形”回路的分离。这意味着沿该环路的上弧或下弧的增益不对称。通过使用与时间相关的电路方程，可以用数值和解析近似的方法表明，至少对于所采用的电路和参数值，容性负载引起的不对称性并不是很大。然而，容性负载将意味着输出电压和电流之间的滞后，因此，低通滤波。结果表明，较小的V_A_$和较大的S_$可以显著地减小相位滞后，但代价是严重的失真。
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英文标题：
《On the Effects of Resistive and Reactive Loads on Signal Amplification》
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作者：
Luciano da F. Costa
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最新提交年份：
2018
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分类信息：

一级分类：Electrical Engineering and Systems Science        电气工程与系统科学
二级分类：Signal Processing        信号处理
分类描述：Theory, algorithms, performance analysis and applications of signal and data analysis, including physical modeling, processing, detection and parameter estimation, learning, mining, retrieval, and information extraction. The term "signal" includes speech, audio, sonar, radar, geophysical, physiological, (bio-) medical, image, video, and multimodal natural and man-made signals, including communication signals and data. Topics of interest include: statistical signal processing, spectral estimation and system identification; filter design, adaptive filtering / stochastic learning; (compressive) sampling, sensing, and transform-domain methods including fast algorithms; signal processing for machine learning and machine learning for signal processing applications; in-network and graph signal processing; convex and nonconvex optimization methods for signal processing applications; radar, sonar, and sensor array beamforming and direction finding; communications signal processing; low power, multi-core and system-on-chip signal processing; sensing, communication, analysis and optimization for cyber-physical systems such as power grids and the Internet of Things.
信号和数据分析的理论、算法、性能分析和应用，包括物理建模、处理、检测和参数估计、学习、挖掘、检索和信息提取。“信号”一词包括语音、音频、声纳、雷达、地球物理、生理、（生物）医学、图像、视频和多模态自然和人为信号，包括通信信号和数据。感兴趣的主题包括：统计信号处理、谱估计和系统辨识；滤波器设计；自适应滤波/随机学习；（压缩）采样、传感和变换域方法，包括快速算法；用于机器学习的信号处理和用于信号处理应用的机器学习；网络与图形信号处理；信号处理中的凸和非凸优化方法；雷达、声纳和传感器阵列波束形成和测向；通信信号处理；低功耗、多核、片上系统信号处理；信息物理系统的传感、通信、分析和优化，如电网和物联网。
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英文摘要：
  The effects of reactive loads into amplification is studied. A simplified common emitter circuit configuration was adopted and respective time-independent and time-dependent voltage and current equations were obtained. As phasor analysis cannot be used because of the non-linearity, the voltage at the capacitor was represented in terms of the respective integral, implying a numerical approach. The effect of purely resistive loads was investigated first, and it was shown that the fanned structure of the transistor isolines can severely distort the amplification, especially for $V_a$ small and $s$ large. The total harmonic distortion was found not to depend on $V_a$, being determined by $s$ and the load resistance $R$. An expression was obtained for the current gain in terms of the base current and it was shown that it decreases in an almost perfectly linearly fashion with $I_B$. Remarkably, no gain variation, and hence perfectly linear amplification, is obtained when $R=0$, provided maximum power dissipation limits are not exceeded. Capacitive loads imply the detachment of the circuit trajectory from a straight line to an "ellipsoidal"-like loop. This implies a gain asymmetry along upper or lower arcs of this loop. By using the time-dependent circuit equations, it was possible to show numerically and by an analytical approximation that, at least for the adopted circuit and parameter values, the asymmetry induced by capacitive loads is not substantial. However, capacitive loads will imply lag between the output voltage and current and, hence, low-pass filtering. It was shown that smaller $V_a$ and larger $s$ can substantially reduce the phase lag, but at the cost of severe distortion.
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PDF链接：
https://arxiv.org/pdf/1802.08053