Simulation of electronic circuit uses mathematical models to get the actual behavior of the printed circuit board or electronic devices. Simulation software allows for modeling of electronic circuit operation. Simulating a circuit behavior before actually manufacturing it improves the design efficiency. In integrated circuits the manufacturing cost is very much high, internal signals behavior is difficult. Simulator involves schematic editor, simulation engine, and waveform display and sees what effect can occur during operation. Printed circuit boards designing require specific modeling such as transmission lines, IBIS models for running and receiving electronics.
Simulation is an essential process of design of any component or machine. In the designing process of printed circuit boards, Pspice simulator is available by OrCAD PCB design software. It basically increases the efficiency of manufacturing by providing a fast preview to say how printed circuit board is going to look like and also up to some extent promise the performance of the printed circuit board in application.
If PCB has any kind of functional property involving speed, frequency, signals, lower current then it is required to get the best schematic layout to integrate the system with better simulation tools. Power delivery, signal integrity, mixed signal simulation and many other parameters can analyzed very easily by simulating the Printed circuit board.
OrCAD is used to design the electronic circuits of the printed circuit boards and then Pspice does the simulating. There are many types of analysis which Pspice can perform DC analysis, AC analysis and advanced analysis. These are explained below in detail:
DC analysis: It is of three types viz. DC sweep analysis, Bias point analysis and DC sensitivity analysis. DC sweep analysis is used for global parameter and can analyze over a range of temperature. The bias point can implement any type of analysis.
AC analysis:It is also of many types like AC sweep analysis, noise analysis and parametric analysis. AC sweep analysis is used to calculate the small signal response. Similarly, noise analysis is used to detect the noise because of input and output. Parametric analysis is a iterative analysis.
Transient analysis:It involves temperature analysis and Monte Carlo analysis. The former analyze the analysis of printed circuit board over a range of temperature and later is used to calculate the circuit response over different parameters.
Creation of simulation profile:
Before Pspice simulation, one has to create a simulation profile in which analysis type is selected and saved and can be reused later if required. Editing and modifications can be done according to the design of Printed circuit boards.
In the Pspice tab chose Run or press F11 in OrCAD capture.
Then a Netlist generation box will appear on the screen which indicates each link of the whole process of design. Once the process of simulation is completed, it will be shown in the output window.
View Output waveform
Once the design is being simulated, the output waveform can be checked using Pspice, which essential to examine the electronic circuit performance and designs credibility increases. Output waves can be analyzed by different methods. In this process you are required to place your circuit design and then OrCAD capture those points where we want simulation wave forms. Markers can be selected from the menu as shown in the figure below:
There are two types of files for simulation one is the waveform data file and pspice output file. The former is used to produce results which can be displayed graphically. To configure the output file, the option tab can be used, as shown in the figure.
Altium Designer: With so many simulation software for circuits and electronic devices. Altium Designer is one unified design software which provides design to simulation, and it directly links the circuit simulator tool with the printed circuit board design with a single interface. The unified design environment there is no need of schematic layouts to another simulation tools.
Mostly designed printed circuit boards to be powered with DC sources, and power delivered to the circuit ensures the functionality of the device. Poor power supply is the main cause for many operation problem which are difficult to diagnose. Power supply also creates problem for signal integrity in the printed circuit board, and the electronic circuit eventually fails.
Power delivery network helps to analyze the voltage characteristics and current density across the printed circuit board. Heat generation in the printed circuit board is proportional to current density, potential hot spot within the board can be easily flagged.
Larger IR drops, current density, temperature spots can be calculated in Altium designer. The available tools within the software easily integrate with the design and provide most accurate design and good power density and signal flow.
With Altium Designer any part of the printed circuit board can be analyzed. Simulation models can also be imported in other standard industry formats. SPICE models are used for analog devices, and functionality of digital components is defined with IBIS tools.
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