Comparison of ECAD between Cadence of Cadence, EWB of InteracTIve Image Technologies of Canada, PROTEL of AlTIum of Australia, and PADS of Mentor Graphics of the United States
When it comes to electronic design automation, from the 1980s, many companies around the world started to introduce Computer Aided Design (PC) software for microcomputer systems. Many companies in the world have a place in the fierce market competition for their own CAD software. They have launched CAD software with their own company characteristics. After years of practice testing, continuous modification and improvement, or superior survival, or mergers and acquisitions, Or strong alliance, CAD technology has matured. CAD is a general-purpose technology. In addition to being widely used in many other industries such as machinery and construction, with the help of SPICE3.5/XSPICE of the University of California at Berkeley as a simulation engine, many companies in the world also introduce various electronic products. The industry's excellent EDA software; from another perspective, CAD (computer-aided design) is the physical stage of electronic design; CAE (computer-aided engineering) is the circuit-level design stage; EDA (electronic design automation) is the advanced electronic system design phase. One of the most realistic criteria for measuring the pros and cons of a software is its market share, which is its popularity and popularity. As Mr. Lu Xun said: “In fact, there is no way on the ground, and there are many people who have gone, and it has become a road.†When it comes to EDA software, OrCAD of Cadence, USA, EWB of InteracTIve Image Technologies of Canada, and PROTEL of AlTIum of Australia. The PADS of Mentor Graphics of the United States is one of the leading players.
OrCAD software from Cadence, USA
Cadence's OrCAD software is one of the most widely used EDA software in the world and is a prominent representative of EDA software. OrCAD software is powerful, and its interface is friendly and intuitive. It is widely used abroad, and a large number of electronic engineers in Europe and America use it. Due to the late entry of OrCAD software into China, with the rapid development of China's electronics industry, users using OrCAD software are increasing year by year. From the earlier version of OrCAD 4.0 working in DOS environment to the latest OrCAD 10.5, OrCAD software integrates electrical schematic drawing, printed circuit board design, digital/analog circuit simulation, programmable logic device design and so on. The library is also the most abundant of all EDA software, and it has always been the first choice for EDA software in the world. Cadence has become one of the world's most powerful companies developing EDA software. The OrCAD software system mainly includes: OrCAD / Capture CIS (circuit diagram design); OrCAD / PspiceA / D (digital / analog hybrid simulation); OrCAD / Layout Plus (PCB design), etc., each of which can be used separately according to needs, and Together they can form a complete EDA system.
The functions and features of several major software of OrCAD software system:
OrCAD / Capture CIS: It is the shared software in the OrCAD package and the basis for the other two. It is a powerful schematic design software. In addition to the generation of various circuit schematics, the Capture CIS software also has a component information system module CIS (Component Information System) that is distinct from other circuit diagram drawing software. In addition to the efficient management of more than 40,000 components in the component library, the information system module also has the ICA (Internet Component Assistant) function, which can be viewed through other component databases on the Internet during the process of designing the circuit diagram. More than one million components, and can be transferred to the circuit diagram or added to their own library files according to the drawing needs; after the circuit diagram drawn by Capture software is completed, you can also directly call OrCAD /Pspice software to simulate, or enter OrCAD / Layout Plus software for board design; OrCAD / Capture CIS user interface is friendly, intuitive image, easy to use; powerful and flexible operation, scientific and effective project management, strong adaptability, support a variety of international standards.
OrCAD / PspiceA/D: This is a general-purpose circuit simulation software that has an optimized design in addition to digital circuit and digital-to-analog hybrid circuit simulation. The Probe module in the software is equivalent to a “virtual oscilloscope†that not only displays the resulting signal waveform after the simulation ends, but also performs various arithmetic processing on the waveform, including extracting circuit characteristic parameters, analyzing circuit parameters and component parameters. Relationships make the analysis process more convenient and intuitive.
OrCAD / Layout Plus: This is a printed circuit board PCB design software that can directly convert the generated circuit diagram into PCB design by manual or automatic placement and routing. OrCAD / Capture software has a high level of design metrics: the maximum board size can be designed to be 68 (inches) 2; the level can be up to 30 layers; the highest resolution of the wiring is 1 micron; the rotation angle can be accurate to 1 point when placing components . In addition, there are automatic push, matrix layout, intelligent copper, and a variety of PCB design software for data exchange, including the exchange of data with a variety of mechanical CAD software, generating 3D contour graphics and other functions. Its component package library is very rich, and the package library can be edited, modified and added with a new package through the Library Manager. OrCAD / Layout Plus software is known for its powerful functions in the PCB board industry. A veritable high-end, professional PCB design EDA software.
Two Canadian Interactive Image Technologies EWB software
EWB (Electronics Workbench) is a distinctive EDA software launched by Interactive Image Technologies (IIT) in Canada in 1988. It has its outstanding advantages such as intuitive interface, convenient operation, powerful analysis, easy to learn and use, etc. It was quickly promoted in China in the 1990s. Many colleges and universities have incorporated EWB5.0 into teaching materials as an electronic major. An aid to the teaching and experimentation of the course. In the early 21st century, the EWB5.0 version was updated to launch EWB6.0, and changed its name to Multisim2001. In 2003, it was upgraded to Multisim7. In 2005, Multisim8.0 was released. Its function is very powerful, and it can be used for circuit analysis and analog circuits. Virtual simulation of digital circuits, high-frequency circuits, RF circuits, power electronics, and automation principles; and provides up to 18 basic analysis methods. At present, the official website of IIT of Canada is still releasing Multisim10, and it has been perfected.
The main features of the electronic simulation software Multisim7 are as follows:
There are two columns of 23 component boxes on the left side of the basic interface. Various simulation components can be called in different categories. There are 17 virtual instruments on the right side that can be called without limitation. The middle is the circuit construction and simulation operation platform.
The basic analysis methods of 15 circuits provided by Multisim9 software.
Multisim software has several other virtual instruments that are not available in any simulation software. For example, "4 Trace Oscilloscope" and "Real-Time Probe" can dynamically measure the voltage of each node of the circuit, and the world's top multinational Agilent measuring instrument: "Agilent function Signal Generator, "Agilent 6-and-a-half Digital Multimeter", "Agilent Oscilloscope", the panel and knob operation of these three instruments are exactly the same as the actual Agilent instrument.
Introduction to the three-plate software Ultiboard7
As another aspect of MultiSIM technology, Canadian IIT also provides users with the supporting platemaking software Ultiboard7. The electronic circuit content after simulation design with Multisim7 can be directly and seamlessly linked to Ultiboard7 for printed circuit board design. One of the obvious advantages of the plate-making software Ultiboard7 is that it has a very rich component package library. There are more than 4,000 pin-in package components, which is more than 10 times that of Protel component package file Footprints.lib. Under normal circumstances, it can always be a large number of Find the right component package directly in the package form, eliminating the need to modify and create component packaging. But to master its PCB design rules, automatic wiring and other operations is to work harder, plus the lack of software access, lack of data to some extent limit its promotion. However, the use of Ultiboard7 in amateur conditions to make a simple circuit printed board can be free from its design rules, using direct manual component layout and drawing lines, because of its rich component packaging, it is still a simple and convenient plate making option.
Four Australian Altium's PROTEL software
Protel combines schematic drawing, analog and digital circuit mixed-signal simulation, multi-layer board design, programmable logic device design, and chart generation. It has a wide variety of editing functions, powerful and convenient automation design capabilities, a rich library of schematic components, extremely comprehensive tools, documentation and design project organization capabilities, Protel software's good reputation and its outstanding performance, quickly became The preferred and favorite software for many EDA users, Protel software is rich in resources, and easy to learn and get started, very suitable for beginners to design some relatively simple circuits and plates.
Protel later introduced Protel 99 SE (Second Edition), which added some more useful features to PCB platemaking. Now Protel has changed its name to Altium. After entering the new century, Altium has launched Protel DXP. Protel DXP is a new generation of board-level circuit design system. Compared with Protel 99 SE, its interface style is more mature and flexible, especially in simulation and PLD circuit design. Because of its powerful function, rigorous design, and requirements for the operating system, it brings certain difficulties to beginners, and it can also simulate circuits.
Metal oxide semiconductor field effect (MOS) transistors can be divided into N-channel and P-channel. P-channel silicon MOS field-effect transistors have two P+ regions on the N-type silicon substrate, which are called source and The drain is not conductive between the two poles, and when a sufficient positive voltage (gate ground) is applied to the source, the surface of the N-type silicon under the gate exhibits a P-type inversion layer, which becomes a channel connecting the source and the drain. . Changing the gate voltage changes the density of the holes in the channel, thereby changing the resistance of the channel. Such a MOS Field Effect Transistor is called a P-channel enhancement type field effect transistor. If the surface of the N-type silicon substrate is free of gate voltage, the P-type inversion layer channel already exists, and the appropriate bias voltage can increase or decrease the resistance of the channel. Such a MOS field effect transistor is referred to as a P-channel depletion field effect transistor. They are collectively referred to as PMOS transistors.
P Channel Mosfet,P Channel Power Mosfet,Field Effect Transistor,Field Effect Transistor Symbol
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