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一、引言分析电子电路有两个基本方法:图解法和微变等效电路法。微变等效电路法不仅适用于电阻負載,还适用于阻抗負載;能够考虑到电子管寄生电容的影响,不論怎样复杂的电路,都能应用現成的綫性网絡理論来进行分析。它的缺点是只限用于特性曲綫的綫性或近似綫性部分,也就是說,只适用于小信号的情形。图解法能确定靜态工作点,能看出阳极电压和电流的运行范围,能容許对大幅度信号进行分析,看出非綫性失真的程度。特別对直流分量和交流分量具有同一电路的直接耦合放大器的分析具有重要的意义。其缺点为比較費时,对阻抗負載的分析有困难。
I. Introduction Analysis of electronic circuits has two basic methods: graphical method and the micro-equivalent circuit method. Micro-equivalent circuit method is not only suitable for resistive load, but also for the impedance load; to take into account the impact of tube parasitic capacitance, no matter how complex the circuit, can be used off-the-shelf linear network theory to analyze. Its disadvantage is limited to the linear or approximately linear part of the characteristic curve, that is to say it applies only to small signals. Schematic method to determine the static operating point, we can see that the anode voltage and current operating range, can allow large-scale signal analysis, see the degree of nonlinear distortion. Especially for direct-coupled amplifier with direct current component and alternating current component have the same circuit analysis is of great significance. The disadvantage is more time-consuming, the analysis of the impedance load is difficult.