Patent ID: 8110873

Claim:
A high voltage transistor comprising: a substrate where an active region is defined; a first impurity region and a second impurity region in the active region and a third impurity region between the first and second impurity regions; and a first gate electrode on the active region between the first impurity region and the third impurity region and a second gate electrode on the active region between the second impurity region and the third impurity region, wherein the first impurity region comprises a first low concentration region and a first high concentration region in the first low concentration region, and the second impurity region comprises a second low concentration region and a second high concentration region in the second low concentration region, wherein a signal voltage is provided to the second gate electrode, and the second low concentration region end the third impurity region are electrically connected to each other through the signal voltage such that an extended low concentration impurity region is formed in the active region between the first gate electrode and the second impurity region.