The invention relates to a modeling and optimizing method for inter-layer
signal crosstalk of a PCB (
Printed Circuit Board).
Frequency response data of all
dielectric layers of the PCB under different temperature and
humidity conditions are collected, and a mapping model with the
temperature gradient and the
humidity diffusion gradient as input and the
dielectric constant as output is established. And calculating the dynamic distribution of
mutual capacitance and mutual
inductance under the environment change by combining the spatial
layout parameters of the differential
signal pair, and constructing a
crosstalk sensitivity evaluation model with coupled frequency, environment and
layout. And high-risk areas with
crosstalk sensitivity caused by environment change are identified, and the crosstalk change rate of each area is quantified. For a sensitive area, a temperature and
humidity compensation medium structure is introduced to stabilize local
dielectric characteristics and reduce the influence of the environment on crosstalk. And according to the compensated medium distribution, adjusting a differential
signal wiring path and
impedance matching by adopting an optimization method with the aim of minimizing the crosstalk change rate, and generating a wiring
layout with environmental robustness. According to the invention, the
signal integrity and the transmission reliability of the multi-layer PCB in a temperature and humidity changing environment can be effectively improved.