Different point settings are required in different stages of design, and large grid points can be used for device layout in the layout stage; For large devices such as IC and non positioning connectors, the grid precision of 50 ~ 100mil can be used for layout, while for passive small devices such as resistance, capacitance and inductance, the grid precision of 25mil can be used for layout. The accuracy of large grid points is conducive to the alignment and beautiful layout of devices.

Consumer electronics is mainly concentrated in mobile phones, TVs, PCs and other fields, while in the field of smart phones with the highest proportion of downstream terminals, China's sales volume significantly exceeds that of the United States. The scale of China's smartphone market has continued to grow rapidly in recent years, far exceeding the average single digit growth level of the industry, which is inseparable from the improvement of China's huge population base, rapidly developing electronic supporting industry chain, communication base station and other infrastructure.

1. If the designed circuit system contains FPGA devices, the pin assignment must be verified by Quartus II software before drawing the schematic diagram. (some special pins in FPGA cannot be used as ordinary IO).

Printed circuit board is the most active industry in the contemporary electronic component industry, and its industry growth rate is generally about 3 percentage points higher than that of the electronic component industry. It is expected to maintain rapid growth in 2006. Demand upgrading and industrial transfer are the basic driving forces to promote the development of the industry, and HDI board, flexible board, IC packaging board (BGA, CSP) and other varieties will become the main growth points.

With the rapid development of microelectronics technology, the wide application of large-scale and super large-scale integrated circuits and the progress of micro assembly technology, the manufacturing of printed circuit board is developing towards lamination and multi-function, and the graphic wires of printed circuit are thin, microporous and narrow spacing, The mechanical drilling technology used in processing can not meet the requirements, and a new micro hole processing method, namely laser drilling technology, has developed rapidly.