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电子技术教材对反馈放大器分析计算大都采用等效电路法和方框图法。等效电路法计算结果准确,无论多么复杂的电路总可以列出方程组进行计算。然而级效增多或电路很复杂方程效目增多,计算变得繁锁困难,就是得出结论又往往掩盖了反馈的某些物理本质。方框图法物理概念明确,结论能定量地说明反馈对放大器的性能指标(放大倍效、输出输入电阻,频带宽度、失真度等)的影响程度,将反馈的本质披露的一清二楚。但
Electronic technology teaching materials on the feedback amplifier analysis and calculation of the equivalent circuit method and block diagram method. Equivalent circuit method calculation results are accurate, no matter how complex the circuit can always list the equations for calculation. However, the increase in efficiency or the complexity of the circuit has increased the number of equations and the calculation has become cumbersome. That is to say, it often concludes that some of the physical properties of feedback are often obscured. The block diagram method has a clear physical concept. The conclusion can quantitatively explain the influence of feedback on the performance of the amplifier (magnification factor, output input resistance, bandwidth, distortion, etc.) and clarify the nature of the feedback disclosure. but