Patent ID: 8513715

Claim:
A semiconductor device comprising: a semiconductor substrate; an element region formed in the semiconductor substrate; an element isolation region surrounding the element region; a field effect transistor including a gate electrode formed on or above the element region, source and drain regions formed at both sides of the gate electrode in the element region, and a channel region formed in the element region being interposed between the source region and the drain region; gate, source, and drain terminals configured to apply a voltage to the gate electrode, the source region, and the drain region, respectively; and an output terminal being electrically connected to the channel region and configured to output an oscillating signal, the output terminal being not common with the gate, source, and drain terminals, wherein, the threshold voltage of the field effect transistor V th , a gate voltage V gs applied between the source terminal and the gate terminal and a drain voltage V ds applied between the source terminal and the drain terminal satisfy the following relationship: V th <V gs <V ds V th .