Patent ID: 7206552
Filing Date: 2007-04-17
Classification: H01L

Abstract:
1. A semiconductor switching device comprising: a first field effect transistor and a second field effect transistor, each comprising a source electrode, a gate electrode and a drain electrode which are formed on a channel layer of the respective transistor, each of the first transistor and the second transistor having a gate width equal to or less than 400 μm, the first transistor and the second transistor having different saturation currents; a common input terminal connected to the source electrode or the drain electrode of the first transistor and connected to the source electrode or the drain electrode of the second transistor; a first output terminal connected to the source electrode or the drain electrode of the first transistor which is not connected to the common input terminal; and a second output terminal connected to the source electrode or the drain electrode of the second transistor which is not connected to the common input terminal, wherein gates of the first transistor and the second transistor receive control signals so that when one of the transistors opens as a switching element, the other of the transistors closes as another switching element, the transistor with the higher saturation current has a higher pinch-off voltage than the transistor with the lower saturation current, and a difference between a reverse bias voltage applied to the transistor with the lower saturation current and a pinch-off voltage of the transistor with the lower saturation current is such that the transistor with the lower saturation current withstands a predetermined maximum power when the transistor with the higher saturation current allows the predetermined power to pass therethrough.