A switch-operation-determining device provided with a determination circuit for determining whether a switch has been operated, wherein the determination circuit is provided with: a first resistor, a first diode, and a second diode serially connected in the stated order from the power-source side, such that current flows from the power source toward a ground; and a control unit for comparing the anode potential of the first diode and a threshold potential, and determining that the switch has been operated when the anode potential of the first diode is lower. Of the first diode and the second diode, it is the second diode that is connected in parallel with the switch.

In accordance with an embodiment, a method of operating an electronic system includes detecting an incoming transmission on a power line, and modifying a switching behavior of a switched-mode power supply coupled to the power line upon detecting the incoming transmission. Modifying reduces the level of interference produced by the switched-mode power supply.

In accordance with an embodiment, a method of operating an electronic system includes detecting an incoming transmission on a power line, and modifying a switching behavior of a switched-mode power supply coupled to the power line upon detecting the incoming transmission. Modifying reduces the level of interference produced by the switched-mode power supply.

An inrush current control device for an IC chip having multiple functional units and M power switches comprises a programmable counter unit, a selector unit and an enable signal driving unit. The programmable counter unit counts a clock signal and sets a predetermined counting value. The selector unit is connected to the programmable counter unit and has N output ports for outputting N enable signals. The enable signal driving unit has N enable driving circuits correspondingly connected to the N output ports of the selector unit, and controlling on/off states of N groups of the M power switches. The programmable counter unit controls the selector unit to output the N enable signals to the N enable signal driving circuits at a predetermined time interval determined by the predetermined counting value to switch on the N power switches groups successively to reduce the transient inrush current.

In accordance with an embodiment, a method of operating an electronic system includes detecting an incoming transmission on a power line, and modifying a switching behavior of a switched-mode power supply coupled to the power line upon detecting the incoming transmission. Modifying reduces the level of interference produced by the switched-mode power supply.

In accordance with an embodiment, a method of operating an electronic system includes detecting an incoming transmission on a power line, and modifying a switching behavior of a switched-mode power supply coupled to the power line upon detecting the incoming transmission. Modifying reduces the level of interference produced by the switched-mode power supply.

In accordance with an embodiment, a method of operating an electronic system includes detecting an incoming transmission on a power line, and modifying a switching behavior of a switched-mode power supply coupled to the power line upon detecting the incoming transmission. Modifying reduces the level of interference produced by the switched-mode power supply.

A test system measures parameters of a device under test (DUT), including a transistor. The test system includes a first voltage source unit for supplying a gate voltage; a second voltage source unit for supplying one of a drain voltage or a source voltage, the second voltage source having a current measurement device for detecting one of a drain current or a source current flowing through the transistor, respectively; a feedback unit for outputting a feedback current, based on the one of the drain or source currents; and an error amplifier for outputting a feedback control signal, based on comparison of the feedback current and a target current value. The first voltage source unit adjusts the gate voltage based on the feedback control signal so that the one of the drain or source currents converges to match the target current value.