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

摘要： 针对高性能计算机中电源模块或子系统之间相互作用而导致的不稳定性问题，详细研究了多核处理器电压调节模块的输入输出阻抗特性。建立了电压调节模块的小信号模型和系统框图，求出了各种传递函数，设计了反馈补偿回路，并对开环和闭环阻抗特性进行了仿真和实际测量。仿真和测量结果为解决系统稳定性问题打下了基础。

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