1. AC equivalent circuit analysis method. Firstly, draw the AC equivalent circuit, and then analyze the AC state of the circuit, that is, whether the voltage and current of each link in the circuit change according to the law of the input signal, whether to amplify the oscillation, or limit and clip the wave, and shape and identify it;
2.DC equivalent circuit analysis method. Draw the DC equivalent circuit diagram, analyze the DC system parameters of the circuit, find out the static working point and bias characteristics of the transistor, and the coupling mode between stages. Analyze the state and function of related components in the circuit. For example, the working state of the transistor, such as saturation, amplification, cutoff zone, diode conduction or cutoff, etc. ;
3. Frequency characteristic analysis method. Mainly depends on whether the frequency of the circuit itself is suitable for the frequency spectrum of the signal it processes. Roughly estimate its center frequency, upper and lower limit frequencies and bandwidth, such as various filtering, notch, resonance, frequency selection and other circuits;
4. Time constant analysis method. This paper mainly analyzes the circuit composed of R, L, C and diode and its characteristics. Time constant is a parameter reflecting the speed of energy accumulation and consumption on energy storage elements.
Classification of electronic circuit diagrams: The electronic circuit diagrams frequently encountered include schematic diagram, block diagram, assembly diagram and printed layout diagram.
Schematic diagram
Schematic diagram is a kind of circuit diagram used to embody the working principle of electronic circuit, also known as "electrical schematic diagram". Because it directly reflects the structure and working principle of electronic circuits, it is generally used in the design and analysis of circuits. When analyzing the circuit, we can know the actual working situation of the circuit by identifying the symbols of various circuit elements drawn on the drawings and their connection methods.
block scheme
Block diagram is a kind of circuit diagram which uses blocks and lines to represent the working principle and composition of the circuit. Fundamentally speaking, this is also a schematic diagram. However, in this kind of drawing, there are almost no symbols except boxes and connecting lines.
The main difference between it and the schematic diagram above is that all the components of the circuit and their connection modes are drawn in detail in the schematic diagram, while the block diagram only divides the circuit installation function into several parts, depicts each part as a box, adds a simple text description to the box, and illustrates the relationship between the boxes with connecting lines (sometimes arrows).
Therefore, the block diagram can only be used to reflect the general working principle of the circuit, while the schematic diagram can not only show the working principle of the circuit in detail, but also be used as the basis for collecting components and making circuits.