In the development of a new electronic products, the early work is the entire electronic products for a complete design, in the entire electronic design, PCB is the core components of the physical carrier, all of our design intent is the ultimate realization of the PCB board To show. This PCB design in any project is an important part of it.

However, in the previous design, because the frequency is very low, the density is very small, the device between the discipline and the pitch is very large, PCB design work is for the purpose of connectivity, without any other features and performance challenges. So in a very long period of time, PCB design in the entire project status is very low. Usually by the hardware logic to connect the designer to the physical connection of the PCB. At present in some small products or such a development model.

With the rapid development of electronics and communication technology, today's PCB design is already different from the past, a new challenge. Mainly in the following areas:

1, the signal edge rate faster and faster

The edge of the signal is getting faster and faster, the on-chip and off-chip clock rates are getting higher and higher, and the clock frequency is no longer a few megabytes, and hundreds of gigahertz clocks are becoming more common on boards. As the rapid development of chip technology, the signal edge rate is faster and faster, the current rise in the signal are about 1ns.
This will lead to system and board SI, EMC problem is more prominent.

2, the integration of the circuit is growing

The integration of the circuit is getting bigger and bigger, I / O number of more and more, making the board interconnect density continues to increase; due to the increasingly powerful, more and more integrated circuit. Chip processing technology level is also getting higher and higher. Past DIP packaging in the current board almost disappeared, a small pitch BGA, QFP chip into the mainstream package. This makes the PCB design density will increase.

3, product development and time to market to reduce

Product development and time to market to reduce, so that we must face a one-time design success of the severe challenges; time is the cost of time is money. In the field of electronic products such as the replacement of particularly fast, the product available one day earlier, his profit opportunity window will be much larger.

4, PCB is the physical carrier of the product

Because PCB is the physical carrier of product realization. In the high-speed circuit, PCB quality is related to the quality of the product and performance. The same devices and connections, different PCB carriers, their results are different.

So, now the design process has been slowly changing. Designed in the design of the logic of the design often accounted for more than 80% of the hardware development and design, but now the proportion has been declining, in the current hardware design logic function design only 50%, the PCB design part also occupied 50% of the time. Experts expect that in the future design, the logic of the hardware overhead to be smaller and smaller, and the development of design rules and other high-speed PCB design costs will reach 80% or even higher.

Source: Beijing time