Semiconductor device

A semiconductor device, comprising:

• a normally-on transistor including a first electrode of a principal electrically conducting channel, a second electrode of the principal electrically conducting channel, and a first control electrode, the first control electrode regulating a current flow between the first electrode and the second electrode of the principal electrically conducting channel;
• a normally-off transistor including a third electrode of a principal electrically conducting channel, a fourth electrode of the principal electrically conducting channel, and a second control electrode, the second control electrode regulating a current flow between the third electrode and the fourth electrode of the principal electrically conducting channel;
• and
• a voltage applying circuit which applies a voltage to the first control electrode,
• wherein the first electrode of the normally-on transistor is electrically connected to the fourth electrode of the normally-off transistor, and the normally-on transistor is thus connected to the normally-off transistor in series, and
• the voltage applying circuit is configured to apply a second voltage with a polarity opposite to that of a first voltage applied to the first control electrode when the normally-on transistor is brought into an off-state, to the first control electrode when the normally-off transistor is in an on-state, at this time, the first control electrode of the normally-on transistor is electrically connected to the second control electrode of the normally-off transistor through the voltage applying unit.

A semiconductor device, comprising:

• a normally-on transistor including a first control electrode, a first source electrode and a first drain electrode;
• a normally-off transistor including a second control electrode, a second source electrode and a second drain electrode;
• and
• a voltage applying circuit which applies a voltage to the first control electrode,
• the voltage applying circuit is configured to apply a second voltage with a polarity opposite to that of a first voltage applied to the first control electrode when the normally-on transistor is brought into an off-state, to the first control electrode when the normally-off transistor is in an on-state, at this time, the first control electrode of the normally-on transistor is electrically connected to the second control electrode of the normally-off transistor through the voltage applying unit.