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在负反馈放大电路的计算中,常用微变等效电路法和方框图法。微变等效电路法的优点是演算结果比较准确,但对于多级反馈放大电路,由于所列的方程式较多,故演算比较烦琐;此外,这种方法的物理概念不突出。方框图法的突出优点是物理概念明确,突出了反馈深度对电路性能的影响。但是,在方框图法中:①基本放大电路和反馈网络往往不易分开;②在计算时,四种组态所用的量纲都各不相同,因而得到公式太多,不易掌握。
Negative feedback amplifier in the calculation, the commonly used micro-equivalent circuit method and block diagram. Micro-equivalent circuit method has the advantage of more accurate calculation results, but for multi-stage feedback amplifier circuit, because of the listed equations more, so the calculation is cumbersome; In addition, the physical concept of this method is not prominent. The outstanding advantage of the block diagram method is that the physical concept is clear, highlighting the impact of feedback depth on circuit performance. However, in the block diagram method: ① The basic amplifier circuit and the feedback network are often not easy to separate; ② In the calculation, the four kinds of configuration used by the dimensions are different, and thus too many formulas, not easy to grasp.