Negative feedback circuit is one of the more difficult circuits for beginners. If you master the basic circuit analysis method and the four typical negative feedback circuit working principles, it will be easier to learn.
1 instantaneous signal polarity analysis
There is a specific method for the analysis of the working principle of the negative feedback circuit, that is, the signal voltage instantaneous polarity analysis method is adopted. As shown in FIG. 4, it is a negative feedback circuit, and the circuit is taken as an example to introduce the circuit analysis method.
Figure 4 Schematic diagram of transient signal polarity analysis
2 circuit analysis instructions
When analyzing the negative feedback circuit using the transient signal polarity analysis method, pay attention to the following points.
3 negative feedback signal type analysis
When performing negative feedback circuit analysis, it is necessary to analyze the type of signal participating in negative feedback, such as DC signal or AC signal, low frequency or high frequency signal for AC signal, or signal of a certain frequency.
When analyzing the types of signals participating in negative feedback, it is mainly to look at the characteristics of the negative feedback circuit and the characteristics of the entire negative feedback loop. These loop characteristics determine the type of negative feedback, mainly in the following cases.
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