Jiangsu PCB Design Mobile Phone Circuit Board Design

Discussion on simulation optimization of high-performance mobile phone from PCB design
PCB is the basic component of electronic products, and its quality is directly related to the function and life of electronic products. In the past two years, the focus of PCB market has shifted from computer and communication fields to smart phones and tablet mobile terminals. At the same time, electronic products, including smart phones, are increasingly developing towards intelligence, thinness and precision. With the increasing complexity of the system, it will bring more design difficulties to PCB designers, and it will be difficult for them to find problems in the early stage of design and development.
1 feasibility analysis before design
It is understood that for different PCB board types and IC platform schemes, the same mobile phone or several teams are working on several different PCB design schemes at the same time. When there are multiple PCB schemes that need to be evaluated, the preliminary feasibility analysis (layout and wiring channel evaluation) will depend on senior engineers to spend a lot of time.
In addition, with the development of an electronic product, the size of PCB board is getting smaller and smaller, and the number of devices is increasing significantly, which also brings a lot of troubles to PCB design. On the premise of 100% routing rate, many factors such as signal quality and manufacturability should be taken into account. On the premise of ensuring the quality, at the same time, we should pursue higher cost performance, which makes the project more difficult. All these problems will lead to a large proportion of pre-evaluation time in the whole product development cycle.
However, there are two traditional evaluation methods: first, judging by experience, its disadvantage is that the evaluation results are not accurate enough; Second, it is evaluated according to the actual layout and wiring. The evaluation result of this method is accurate, but it takes too long. In addition, the above two methods are faced with the disadvantages that the evaluation can’t be coordinated and the evaluation results are difficult to be reused.
How to quickly and accurately evaluate the early stage and get a feasible design scheme is an important move to speed up the product listing. To this end, Mentor brings an efficient layout platform based on Xpedition. With the help of this platform, time can be saved while accurate evaluation is met, and the evaluation results can be directly reused by later design teams to speed up product design. Experiments show that the traditional evaluation method takes two to three weeks, while the evaluation scheme of Mentor will shorten the time to one week, which is equivalent to saving two-thirds of the time for customers.
Why is Mentor’s platform unique? On the one hand, most of the current mainstream mobile phone chip manufacturers are based on Mentor’s Xpedition platform for development. Therefore, when their products are handed over to downstream mobile phone manufacturers, if the latter also adopts Mentor platform, they can directly reuse reference designs and make accurate evaluation. On the other hand, there are many tools and sound functions on Xpedition platform, which can speed up evaluation and improve efficiency.
It is understood that at present, mainstream mobile phone manufacturers have basically adopted Mentor’s platform scheme for the preliminary evaluation of mobile phone design.
2 simulation optimization after PCB wiring
With the increasing popularity of PCB high-speed signal design, the design of electronic circuit is facing challenges such as signal integrity, power integrity, thermal and electromagnetic compatibility. Therefore, after the preliminary feasibility analysis and the wiring of PCB, the PCB needs to be simulated and verified. Introducing simulation verification into the design will greatly improve the efficiency of product development and the correctness of design.
Among them, the simulation of power supply integrity is one of the main challenges. The level of power supply integrity design directly affects the performance of the system, such as the reliability of the whole machine, signal-to-noise ratio and bit error rate, EMI/EMC and other important indicators. With the increase of circuit signal edge rate, simultaneous switching of a large number of I/O, low power design and other changes, the problem of power transmission becomes more and more important. Take smart phone as an example, the power simulation of its PCB is faced with several pain points: the grouping of Power Domain in mobile phone design is often very complicated, and in order to simulate the power integrity, engineers often need to spend a lot of time on cumbersome port settings, which makes the simulation process take a lot of time, and also leads to engineers not having time to optimize decoupling capacitors.
To this end, Mentor brings an automatic power optimization scheme. Traditional methods need a lot of time to edit ports. By adopting Mentor automatic port setting scheme, customers can automatically create the required ports according to the Power Domain information, which can greatly shorten the port editing time. Experiments show that with this scheme, the time required to set up the port can be reduced from 2 days to 10 minutes, and it doesn’t take much time to re-edit the port after the design changes. In addition, Mentor also provides an automatic decoupling scheme optimization scheme. HyperLynx software platform can automatically identify the port mode of decoupling capacitors, and automatically optimize them by calling PDN optimizer and using optimization algorithm, so as to reduce the types and quantities of capacitors at the same time.
At the same time, the routine inspection of decoupling scheme, early evaluation of decoupling design, EMI-related power plane inspection and other difficult problems can all be solved by Mentor scheme.
3 Important software tools
The realization of excellent evaluation and simulation scheme is inseparable from the support of important software platforms. The above schemes mainly involve Mentor’s Xpedition, HyperLynx PI, HyperLynx DRC and other software platforms.
XP is an enterprise-level solution with a complete design process, including component library design and management, schematic design, PCB design, production data processing, SI/PI simulation, EMC/EMI analysis, thermal analysis and digital-analog hybrid simulation. Compared with similar products, the advantages of powerful process management and data management, concurrent design, collaborative design and integrated verification are the unique labels of Xpedition.
The new Xpedition platform for PCB designers provides designers with a set of scalable tools for the physical design, analysis and processing of complex PCBs, which organically integrates interactive design and automatic wiring into one design environment. Designers can define all design rules, including high-speed routing constraints, creating board shapes, layouts, interactive routing and automatic routing, until the machining files are generated. Xpedition platform is adopted to realize the verification in the design process, which makes the deployment simpler, speeds up the achievement of results and enables customers to maximize the return on investment.
HyperLynx is a series of electronic circuit simulation and verification tools of Mentor Company, which provides complete simulation and analysis functions, including electrical design rule check (DRC/ERC), signal integrity (SI), power integrity (PI), board-level thermal analysis, 3D electromagnetic field modeling and analysis, etc. This set of complete analysis and verification software can meet the needs of engineers at any time in the PCB design process. Through tight integration with the design process, HyperLynx enables PCB engineers to effectively analyze, solve and verify the key requirements of the design, so as to avoid costly repetitive design, speed up the time to market and reduce costs.
HyperLynx DRC is a powerful, fast and fully customizable tool for checking design rules. It can verify complex design rules that are difficult to simulate, such as EMI/EMC rules.
Hyperxpi is an analysis tool introduced by Mentor for the increasingly prominent power integrity (PI) problem. The interface is friendly, easy to learn and use, and the simulation results can be obtained quickly. Hyperxpi can identify potential DC power distribution problems and optimize PDN power distribution network.
It is understood that 93% of HyperLynx customers think that virtual prototyping with HyperLynx can reduce the cost and design time by minimizing repetitive design and eliminating physical prototyping.
If engineers had not found a suitable and excellent pre-evaluation and simulation verification scheme before, now the opportunity came. Mentor not only brought the scheme, but also held a special seminar for it. For more design proofing and pasting business in Jiangsu, circuit board business in Nanjing, Suzhou, Wuxi and other cities, please contact the salesman. The phone is in the head.