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Have the appropriate stencil or screen design and materials (e.g., thickness, aperture geometry, wall finish, etc.) for the circuit board product. Design considerations must also address the need to widen fine-pitch aperture openings slightly for printing Pb-free solder paste. Properly design the circuit board to provide recognizable fiducials and an absence of burrs or other artifacts that can interfere with the dispensing machine and/or stencil performance. Ensure that the stencil is free of particles and other contamination.

TABLE 14.2 A Typical Collection of Design Files Sent to a PCB Assembler File name BBBBaCCC.arc* applist.a readme.asy tpstmsk.ger bpstmsk.ger BBBB-CCC.dbg BBBB-CCC.dip BBBB-CCC.log BBBB-CCC.man BBBB-CCC.smt BBBB-CCC.smb BBBB-CCC.unp BBBB-CCC.vcd XX_XX.asy XX_XX.fab File contents Arc file of all assembly data containing: Aperture list for plotting paste mask Readme file describing assembly Gerber photoplot data for top paste mask Gerber photoplot data for bottom paste mask Mfg. output, data format info. Mfg. output, x-y loc. dip components Mfg. output, component log. Mfg. output, x-y loc. manual insert components Mfg. output, x-y loc. top smt components Mfg. output, x-y loc. bottom smt components Mfg. output, parts not mounted Mfg. output Assembly drawing in HPGL format, sheet XX of XX Fabrication drawing in HPGL format, sheet XX of XX

Some manipulation can get this in the form we need to write down covariant derivatives of X . Note that b X c = b X c +

From the definition of the objective of the PCB design process it can be seen that the process extends from concept all the way through fabrication to assembly and test. Computer-based tools have evolved to automate or improve the speed and accuracy of every step in the process. These tools can be divided into three major groupings based on where they are used:

CAE (computer-aided engineering) tools CAD (computer-aided design) tools CAM (computer-aided manufacturing) tools

It is apparent from the names of the tools that they are used in circuit design, physical layout of the PCB, and manufacture of the bare PCB and the PCB assembly.

CAE Tools CAE tools is the name generally used to refer to the computer-based tools and systems that are employed in the stages of design before the physical layout step or to analyze and evaluate the electrical performance of the final physical layout. These include: 14.3.1.1 Schematic Capture Systems. As the name implies, these tools are used by the design engineer to draw a schematic or circuit diagram. The simplest systems are graphical replacements for the classical drawing board, allowing the engineer to place logic and electronic symbols on the surface of the drawing and connect their terminals with lines. More advanced systems perform substantial error checking such as guarding against multiple uses of the same pin or net name. Failure to connect critical pins such as power pins can be done by using information contained in their component libraries about each part. In addition, these systems can generate netlists to be used by simulators and PCB routers and bills of material for use in the manufacture of the PCB assembly.

14312 Synthesizers Synthesizers are specialized CAE tools that allow a designer to specify the logic functions that a design is expected to perform in the form of logical operations such as dual full adder, 16-bit-wide register, or other macro functions The synthesizer will extract the equivalent logic circuit functions from a function library and connect them together as specified by the designer to arrive at a complete logic diagram This synthesized circuit can then be used as part of a bigger design Some advantages of synthesizers are that all functions of a given type will be implemented the same way and be error free and that time needed to compose a system schematic is reduced by eliminating the labor required to design repeating circuits 14313 Simulators.

Simulators are software tools that create computer-based models of a circuit and run them with input test patterns to verify that the circuit will do the intended function when implemented in hardware Even when run on very large computers, simulators usually run at only a tiny fraction of the speed of the actual circuit When circuits grow complex, as in a 32-bit microprocessor or digital signal processor, the time required to perform a complete simulation can be very long, sometimes so long that this method of circuit verification becomes impractical Typical simulation speeds are 1 or 2 s for each machine cycle A machine cycle may be as little as 2ns or 500 million/s for a system with a 500-MHz clock.