Patent ID: 8058648

Claim:
A testing apparatus for testing a device under test, comprising: a test signal generating section that generates a test signal; a driver that supplies the test signal to the device under test; a comparator that detects an output signal from the device under test; a judging section that judges the output signal detected by the comparator; and a switching device that electrically connects or disconnects, to/from each other, a first terminal and a second terminal, which are respectively (i) at least one of an output end of the driver and an input end of the comparator and (ii) an input and output end of the device under test, wherein the switching device includes: a semiconductor layer; a drain electrode that is formed in the semiconductor layer, the drain electrode being connected to the first terminal; a source electrode that is formed in the semiconductor layer, the source electrode being connected to the second terminal; a gate insulator that is formed on the semiconductor layer between the drain electrode and the source electrode; a floating gate that is formed on the gate insulator, the floating gate retaining a charge therein; and a tunnel gate that is formed on the floating gate, the tunnel gate supplying a tunnel current determined by a driving voltage applied thereto to charge or discharge the floating gate.