To meet the increasing demand for highly integrated circuits,the System in Package(SiP)technology has received more and more attention.With the increase of I/O count and the increase of the data rate,the signal integrity problem in SiP has become increasingly prominent.In this paper,a form of chip-embedded fan out packaging is proposed,and the return loss of high-speed differential signals and the crosstalk of signals are studied,the layout near TSVs and solderballs,especially the return path,is optimized.As a result,S21 of differential signal increases by 0.63 dB,S11 decreases by 4.06 dB at the 5 GHz frequency point,near-end crosstalk of single-end signal decreases by 215 mV,and far-end crosstalk decreases by 212 mV.
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