| Summary: | In engineering applications, the gain of a negative feedback amplifying circuit is commonly obtained by an estimation method. The negative feedback amplifying circuit examples of various configurations are selected, and the voltage gain is estimated and calculated. The relationship between the estimated relative error and the negative feedback depth is studied. Combined with the theoretical derivation, it is concluded that both the negative feedback amplifying circuits consisted of integrated operational amplifier and the multi-level negative feedback amplifying circuits are easy to form deep negative feedback, the gain estimation error is small; and the single-stage amplifying circuit composed of discrete components is not easy to form deep negative feedback, the estimation error is large; the deeper the negative feedback, the smaller the estimation error is; the product of the estimated relative error and the negative feedback depth is equal to one.
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