With the fast development of electromagnetic technology, System in Package (SiP) becomes another effective wayto realize small size, light weight, low power and low cost in signal processing system. Aimed at matching the application request ofdigital intermediate frequency pre-processing system, a method of integration of wave generation, digital filter, uploading anddistribution of digital signal thus clock and synchronization is proposed. PBGA225 package which decreases the volume and powerobviously is adopted.