Patent ID: 8624261

Claim:
A nitride semiconductor device, comprising: a first transistor of n-type channel having a first gate, a first source, and a first drain and including a nitride semiconductor; a second transistor of n-type channel having a second gate, a second source electrically connected to the first gate, and a second drain, the second transistor including a nitride semiconductor; a third transistor of n-type channel having a third gate, a third source electrically connected to the first source, and a third drain electrically connected to the first gate and the second source, the third transistor including a nitride semiconductor; a fourth transistor of n-type channel having a fourth gate electrically connected to the third gate, a fourth source electrically connected to the first source and the third source, and a fourth drain electrically connected to the second gate, the fourth transistor including a nitride semiconductor; a resistor having one end electrically connected to the second drain and one other end electrically connected to the second gate and the fourth drain; a drain electrode pad electrically connected to the fourth drain; a source electrode pad electrically connected to the first source, the third source and the fourth source; a gate electrode pad electrically connected to the fourth gate and the third gate; and a power-supply electrode pad electrically connected to the second drain and the one end of the resistor.