Noise isolation of PDN using in-package filter in LTCC-based system-in-package (SiP)

In this paper, the noise propagation in power distribution network (PDN) of low-temperature co-fired ceramic (LTCC) based system-in-package (SiP) is studied, including the effects of printed circuit board (PCB) PDN. A low-pass filter for PDN noise isolation in LTCC-based SiP, which is made of discrete capacitors and embedded inductor, is proposed. This filter can be easily designed based on microwave-filter design theory. And it can provide broadband noise isolation along with PCB and package bulk capacitors. The electromagnetic full wave simulation results show that this method can provide noise isolation of 50dB from hundreds of kilohertz (KHz) to more than 10GHz in our case. Besides, this method can simplify PCB design by reducing ferrite beads and PCB decoupling capacitors.