An efficient modeling of the multi-gigabit SSO interference to the pre-driver in the weak power supply system based on the charge exchange domain partitioning technique with intentionally utilizing high power supply impedance

A mitigation of the multi-gigabit SSO noise interference from the I/O buffer to the pre-driver in a DDR4 interface is demonstrated by utilizing a parasitic low-pass noise filter inside the low-cost wire-bonding packages. By optimizing the mutual inductance between I/O driver´s and pre-driver´s power supplies, the on-die decoupling capacitance of the 32bit DDR4 interface operating at 2133Mbps has been successfully reduced by 66-75% with keeping signal quality. A scaling issue in the SSO noise interference analysis is also addressed in this study by employing a domain partitioning technique based on whether individual power supply is closed or open system on the electrical charge. The design study has demonstrated the advantage of the low-cost wire-bonding packages when used for multi-gigabit single-ended interface, which also suggests the design direction and possibility of the over-2Gbps DDR interface with the wire-bonding packages.