 ### Four commonly used circuit analysis methods

- Apr 06, 2017-

Commonly used methods of analysis of the circuit are the following:

1, DC equivalent circuit analysis

In the analysis of circuit theory, to clear the DC circuit and AC circuit. DC path refers to the static bias of the semiconductor transistors and integrated circuits when there is no input signal. AC circuit refers to the way of AC signal transmission.

In the actual circuit, the AC circuit and the DC circuit coexist in the same circuit.

Analysis of DC equivalent, a method of analysis is to separate the analyzed circuit of DC system in DC equivalent analysis, without considering the processing circuit of input AC signal, only consider the relationship between the static DC power supply DC voltage caused by direct current voltage and between them.

DC equivalent circuit, the DC equivalent circuit should be drawn. The following principles should be followed when drawing the equivalent circuit diagram of DC: the capacitor can be treated by open circuit, and the inductor which can ignore the DC resistance should be regarded as a short circuit. The voltage of the decoupling circuit is taken as the supply voltage of the equivalent circuit.

2, AC equivalent circuit analysis

AC equivalent circuit analysis is a method to separate the AC system in the circuit from the circuit.

AC equivalent analysis, we should draw the AC equivalent circuit diagram. The AC equivalent circuit diagram shall follow the following principles: the power supply shall be regarded as a short circuit, and the AC bypass capacitor shall be viewed as a short circuit.

3, time constant analysis

Time constant analysis method is used to analyze R, L, C and properties of semiconductor diode circuit, the time constant is a reflection of energy storage elements on energy accumulation speed, if different time constants, although the circuit form and the connection is similar, but the circuit function is different. Common coupling circuit, differential circuit, integrated circuit, clamp circuit and peak detection circuit, etc..

4, frequency characteristic analysis method

Frequency characteristic analysis method is mainly used to analyze whether the frequency of the circuit itself is compatible with the frequency of the signal to be processed. Analysis should be a simple calculation of its center frequency, the upper and lower limits of frequency and bandwidth, etc.. Through this analysis, we can know the nature of the circuit, such as filter, trap, resonance, frequency selection circuit, etc..