Circuit Analysis Method of multisim

Circuit Analysis Method of multisim: Mainly includes DC work point analysis, AC analysis, transient analysis, Fourier analysis, noise analysis, Distortion Analysis, DC scan analysis, sensitivity analysis, parameter scan analysis, temperature scan analysis, zero-pole analysis, transfer function analysis, worst case analysis, Monte Carlo analysis, batch processing analysis, user-defined analysis, and noise coefficient analysis.
1. DC operating point analysis (DC operating): During DC operating point analysis, the AC source in the circuit is set to zero, the capacitor is open, and the inductance is short-circuited.
2. AC analysis: it is used to analyze the frequency characteristics of a circuit. Select the circuit node to be analyzed. During the analysis, the swap source in the circuit is set to zero automatically, and the AC signal source, capacitor, and inductance are in the AC mode, the input signal is also set to a sine wave. If other signal of the function generator is used as the input excitation signal, it is automatically used as the sine signal during the analysis of the AC frequency. Therefore, the output response is also a function of the AC frequency of the circuit.
3. Transient Analysis: transient analysis is the time domain response of the selected circuit node. That is, observe the voltage waveform of the node at each time point throughout the display cycle. During transient analysis, the DC power supply maintains a constant, and the AC signal source changes over time. Both the capacitor and inductance are energy storage mode components.
4. Fourier analysis: used to analyze the DC, fundamental frequency, and harmonic wave components of a time-domain signal. That is, the time-domain change signal at the tested node is used as the Discrete Fourier Transform to analyze the node. Generally, the frequency of the AC excitation source in the circuit is set to the fundamental frequency. If there are several AC sources in the circuit, the fundamental frequency can be set to the minimum public factor of these frequencies.
5. Noise Analysis: noise analysis is used to check the noise power amplitude of the output signal of an electronic line. It is used to calculate and analyze the effect of the noise of a resistor or transistor on the circuit. In the analysis, assuming that the noise sources in the circuit are irrelevant, their values can be calculated separately. The total noise is the sum of the respective noise on the node (expressed by a valid value ).
6. Noise Figure Analysis: it is mainly used to study the influence of noise parameters in the component model on the circuit. In the definition of noise coefficient in multisim, "no" indicates the output noise power, and "ns" indicates the thermal noise of the signal source resistor, G is the AC gain of the circuit (that is, the ratio of the output signal of the two-port network to the input signal ). The unit of noise coefficient is dB.
7. distortion Analysis: Distortion Analysis is used to analyze harmonic distortion and internal modulation distortion (intermodulation distortion) in electronic circuits. Generally, nonlinear distortion leads to harmonic distortion, the phase offset causes intermodulation distortion. If there is an AC signal source in the circuit, the analysis can determine the Secondary Harmonic of each node in the circuit and the complex value of the Third Harmonic. If there are two AC signal sources in the circuit, this analysis can determine the complex values of the circuit variables at three different frequencies: the sum of the two frequencies, the difference between the two frequencies, and the difference between the second harmonic increase and the other frequencies. This analysis method is used to analyze the distortion of small signals in the circuit, and uses the multi-dimensional "voterra" analysis method and multi-dimensional "Taylor" (Taylor) series to describe the non-linearity at the work point, the level must use a cubic item. This analysis method is especially suitable for observing the small distortion that cannot be seen in transient analysis.
8. DC Scanning Analysis (DC sweep): analyzes the changes of the DC operating point on a node of the circuit using one or two DC power supplies. Note: If the circuit contains a digital device, it can be treated as a large grounding resistor.
9. Sensitivity Analysis: it is used to analyze the sensitivity of Circuit Characteristics to component parameters in the circuit. Sensitivity analysis includes DC sensitivity analysis and AC sensitivity analysis. The simulation results of DC sensitivity analysis are displayed as numerical values, and the simulation results of AC sensitivity analysis are displayed as curves.
10. Parameter Scanning Analysis (parameter sweep): The parameter scanning analysis method is used to analyze the circuit, so that the parameters of a component can be quickly obtained and the influence on the circuit when the parameters change within a certain range. It is equivalent to taking different values for multiple simulation each time. For digital devices, parameter scanning and analysis are considered as high-impedance grounding.
11. temperature scan analysis (temperature sweep): temperature scan analysis allows you to observe the Circuit Characteristics under different temperature conditions at the same time, which is equivalent to the simulation of different temperature values of the component each time. You can select the start value, end value, and increment value of the temperature of the analyzed component in the "temperature scan analysis" dialog box. During other analysis, the default Simulation Temperature of the circuit is set to 27 degrees Celsius.
12. Zero pole analysis (pole zero): it is a useful tool for circuit stability analysis. This analysis method can be used to analyze the zero point and the pole in the transfer function of the AC small signal circuit. Generally, the DC operating point analysis is performed first to obtain a linear small-signal model for nonlinear Devices. On this basis, we analyze the zero and pole of the transfer function. Zero-pole analysis is mainly used to simulate small-signal circuits, and digital devices will be considered as high-impedance grounding.
13. Transfer Function Analysis (Transfer Function): it can analyze the output voltage of one source and two nodes or the DC Small Signal Transfer Function between one source and one current output variable. It can also be used to calculate the input and output impedance. You must first analyze the DC operating points of analog circuits or non-linear devices, obtain a linear model, and then analyze small signals. The output variable can be the node voltage in the circuit, and the input must be an independent source.
14. Worst case analysis: a statistical analysis method. It enables you to observe the worst possibility of circuit feature changes when component parameters change. It is suitable for analyzing analog circuit value streams and small signal circuits. The worst case is the maximum deviation of the circuit performance caused by the combination of component parameters on the boundary of the tolerance domain, the worst case analysis is to estimate the maximum deviation between the circuit performance and the nominal value when the parameter tolerance of the circuit element is given.
15. monte Carlo Analysis (Monte Carlo): Used to observe component parameters in a given circuit. When the selected Error Distribution Type changes within a certain range, the effect on circuit characteristics. With these analysis results, we can predict the yield rate and production cost of the circuit during batch production.
16. Trace Width Analysis (trace width): it is mainly used to calculate the minimum wire width required for current flow out of the circuit.
17. batched: in actual circuit analysis, multiple analyses of the same circuit are usually required. For example, to determine the static work point of a amplifying circuit, DC work point analysis is required; to understand its frequency characteristics, communication analysis is required; to observe the output waveform, transient analysis is required. Batch analysis allows different analysis functions to be executed in sequence.