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1. A semiconductor device comprising:
a first field-effect transistor being of a normally-on type; a second field-effect transistor being of a normally-off type and having a drain thereof connected with a source of the first field-effect transistor; a resistor having one end thereof connected with a gate of the first field-effect transistor and having the other end thereof directly connected with a source of the second field-effect transistor; and a diode having an anode thereof connected with the gate of the first field-effect transistor and having a cathode thereof directly connected with the source of the second field-effect transistor, wherein the resistor and the diode are connected in parallel with each other such that, at a time of turning off of the semiconductor device, electric currents flow to the resistor and the diode, respectively.
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