Power supply apparatus and a test system including the same

A power supply apparatus comprising:

• first through M-th switching regulators configured to generate first through M-th reference power signals using an input power signal, wherein M is a natural number greater than or equal to two;
• first through N-th multiplexers configured to select one of the first through M-th reference power signals, in response to a power selection signal, to provide first through N-th selection, power signals, wherein N is a natural number greater than or equal to two;
• first through N-th linear regulators configured to generate first through N-th output power signals using the first through N-th selection power signals, wherein the first through N-th linear regulators are connected to the first through N-th multiplexers, respectively;
• and
• a controller configured to generate a reference control signal, the power selection signal, and an output control signal,
• wherein values of the first through M-th reference power signals are set using the reference control signal, and
• wherein values of the first through N-th output power signals are set using the output control signal.