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Primary batteries are those that cannot be recharged. Once they lose energy, they have to be replaced. Primary batteries are of different types. Most common are the zinc chloride with carbon electrodes dry cells. The cell voltage is 1.5 V These . are the cheapest of all the primary batteries. Increasingly, alkaline cells also of 1.5 V are becoming popular. They have a higher capacity compared to the zinc chloride cells. Alkaline cells also have higher shelf life than the zinc chloride cells. Another type of primary battery is the lithium battery with a cell voltage of 3.0 V These batteries are .

Placing Components on PCBs Upon successful completion of the logical and gross timing simulation process, the actual physical layout can begin. It begins by placing the components of the design on the surface of the PCB in patterns that group logical functions together. Once this is done, the groups of components are located on the PCB surfaces such that functions that interact are adjacent, components that generate heat are cooled properly, components that interface to the outside world are near connectors, and so on. This placement operation can be done manually by the designer using graphics-based tools or automatically by the PCB CAD system.

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Sequencing Nets to High-Speed Rules Most logic families have sufficiently fast rise and fall times and short enough propogation delays to be subject to high-speed problems such as coupling and reflections. To ensure that these high-speed effects do not result in malfunctions, it is necessary to arrange the connections between the loads, terminations, and drivers to control these high-speed phenomena. This arranging of nodes or points in a net is referred to as sequencing or scheduling. Once the components have been placed on the surface of the PCB, the spatial arrangement of all the nodes on each net is known. At this point, it is possible to determine how to connect the driver to the loads and terminators to form proper transmission lines, ensuring that improper stubs are not created and that the terminator is at the end of the net.

Simulating Timing and Transmission Lines Effects Upon completion of component placement and sequencing the nodes in each net, it is possible to estimate the length and characteristics of each net. This is possible because the x-y location of each point in a net is known, the order of connections is known, and the fact that the actual wiring must be done in either the x or y direction is also known. This length information can be used to model the high-speed switching characteristics of each net and predict the presence of excessive noise and reflections as well as to estimate the length of time required for signal to travel the length of each line, all before actually routing or building the PCB. This simulation step makes it possible to detect potential malfunctioning signals prior to routing and take steps to fix the problem while the time invested in the design is still modest.

Adjusting Sequencing and Placement If the simulations done in Sec. 14.2.10 reveal excessive time delays or reflection problems, the placement may need to be adjusted to move critical parts closer together or add terminations to nets with excessive reflections. By doing this simulation and adjustment, a design can be assured of meeting the right the first time goal so important to high-performance designs.

where ho is the mean radial clearance of the bearing If the calculated stiffness is more than the required value, the selected dimensions can be confirmed Otherwise, the procedures are repeated K=

Testing Routability of Placement At this point, enough analysis has taken place to know that the design will function correctly if routed. However, it may not route in the number of signal layers required by the cost goal. Most CAD systems have tools, such as rats-nest analyzers, that help the designer determine if the design will fit into the allowed signal layers. If it will not, the routability analyzer may give clues on how to revise the component placement to achieve a successful route. Once the placement has been adjusted, the timing and transmission line simulation steps must be repeated to ensure that the set of goals has been met.

Routing PCB This step involves fitting all the connections into the signal layers in the form of copper traces, following spacing and length rules. It usually involves a combination of hand routing special signals and automatically routing the rest.

expensive compared to the zinc chloride and the alkaline batteries but have much higher energy density and shelf life of up to 10 years.

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