| 摘要 |
A device that tests an output impedance of a voltage regulator module (VRM) includes a controller, a current regulating circuit, a voltage sampling circuit, and a current sampling circuit. The voltage sampling circuit samples an instantaneous alternating output voltage of the VRM, and outputs the instantaneous alternating output voltage to the controller. The current sampling circuit cooperates with the controller in sampling the instantaneous output current of the VRM. The controller controls the current regulating circuit to regulate the instantaneous output current of the VRM until the instantaneous alternating output voltage is about equal to a predetermined reference voltage, and calculates an output impedance of the VRM according to the instantaneous alternating output voltage and instantaneous output current when the instantaneous alternating output voltage is about equal to the predetermined reference voltage.
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