Patent ID: 7508228

Claim:
A semiconductor device tester comprising: a PMU driver circuit configured to provide a DC test signal for testing a semiconductor device; a first feedback circuit configured to sense a DC test signal directly from an output of the PMU driver circuit, wherein there are no intervening circuit elements between the output of the PMU driver circuit and a point at which the first feedback circuit senses the DC test signal; a second feedback circuit electrically connected to the semiconductor device, the second feedback circuit to sense the DC test signal near the semiconductor device; a third feedback circuit electrically connected across part of an output signal path of the PMU driver circuit, the third feedback circuit to sense a current output of the PMU driver circuit; and a switch to electrically connect one of the first feedback circuit, the second feedback circuit, and the third feedback circuit to an input of the PMU driver circuit; wherein the PMU driver circuit is configured to compensate for voltage or current based on which of the first feedback circuit, the second feedback circuit, and the third feedback circuit is electrically connected, via the switch, to the PMU driver circuit.