Research on the Suppression of Resonance in High-Density CQFN Packages
The resonance issue of the high-density ceramic quad flat no-lead (CQFN) shell is analyzed based on full-wave electromagnetic simulation software.The research content include the methods to quickly judge the reso-nance frequency point by using full-wave electromagnetic simulation software,and the methods to restrain the gener-ation of resonance frequency points by adjusting the internal structure without changing the outer structure of the package.Based on the above method,an improved CQFN shell with resonant frequency points in the DC～20 GHz band is developed.The test results indicate that the resonant frequency of the improved version is suppressed in the DC～20 GHz.There is strong consistency between testing results and simulation results,which proves that this analy-sis method can effectively address the resonance issue of CQFN packages,and it is also applicable for analyzing resonance problems in various surface-mounted high-density ceramic packages.
electromagnetic resonancesurface mount packagehigh densityhigh temperature co-fired ceramic
万方数据
维普
