| 摘要 |
A field effect transistor ("FET") is provided has a semiconductor region including a channel region, a source region and a drain region and a gate conductor overlying the channel region. Such FET has a first threshold voltage having a first magnitude and a second threshold voltage having a second magnitude higher than the first magnitude, both threshold voltages being effective at the same time. The FET is operable in response to a gate-source voltage between the gate conductor and the source region in multiple states including at least: a) an essentially nonconductive state when a magnitude of the gate-source voltage is less than the first magnitude and less than the second magnitude, the source-drain current then being at most a negligible value; b) a first conductive state when the magnitude of the gate-source voltage is greater than the first magnitude and less than the second magnitude, the source-drain current then having a first operating value about ten or more times higher than the negligible value; and c) a second conductive state when the magnitude of the gate-source voltage is greater than first magnitude and the second magnitude, in which state the source-drain current has a second operating value ten or more times higher than the first operating value.
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