Microsoft removed many legacy ACPI drivers after Windows 8.1. As a result, the CM2 SPD driver is often left uninstalled. The ITE driver from Windows 7 can usually be installed in Windows 10/11 using compatibility mode:
A novel CM2 SPD driver circuit was designed and tested. It offers superior common-mode surge protection for high-speed differential lines with minimal signal degradation. The results comply with IEC 61000-4-5 Level 4 requirements. cm2 spd driver
The active CM2 driver solves the trade-off between fast clamping and low capacitance. Limitations include higher quiescent current (2 mA) and sensitivity to driver supply noise. Future work includes integrating a self-powered topology from the surge event itself. Microsoft removed many legacy ACPI drivers after Windows 8