Modern electronic system is developing in the trend of small package, large scale and high speed as the density of chips is becoming increasingly large in SLSI (super-large-scale integration), which brings about some inevitable problems such as how to analyze and deal with the interconnections and stacking problems in high-speed circuit design. At present, the radio frequency of electronic products reaches hundreds or thousands of MHz and both the rising edge and falling edge become so steep that PCB layout rules and dielectric constant of substrate material are extremely crucial to the electric performance of the system in the process designing such products.

At present, the fast development of Internet technology witnesses the massive application of email, online payment and personal communication. Under this background, information security has been a critical research theme around the world. PKI (Public Key Infrastructure) technology provides security service by using public key theory and technology. PCIE (Peripheral Component Interface Express) technology has received wide applications in high-speed devices as the third generation I/O bus standard applying serial data transmission and point-to-point interconnection technology. In the field of digital system design, relatively high clock frequency leads to some problems in perspectives of signal integrity, power integrity and crosstalk and traditional PCB design fails to meet the requirement of system stability.