关键词: 电压调节模块, 阻抗特性, 开环阻抗, 闭环阻抗, 阻抗测量

Abstract: To solve system instability caused by the interaction between individually designed power modules/sub-systems in high-performance computer, the input and output impedance characteristics of voltage regulator module for multi-core processor were thoroughly studied. The small-signal model and system block diagram of voltage regulator module were developed, and various transfer functions were presented. Then, the feedback compensator was designed, and the open-loop and closed-loop impedance characteristics were simulated and measured. The simulation and measurement results lay a foundation for the improvement of system stability.

Key words: voltage regulator module, impedance characteristic, open-loop impedance, closed-loop impedance, impedance measurement