Patent ID: 7161216

Claim:
A semiconductor circuit comprising: a first transistor having: a first semiconductor region; spaced-apart source and drain regions formed in the first semiconductor region; a first channel defined between the source and drain regions, the first channel having a first channel length and a first dopant concentration; a layer of first gate oxide formed over the first channel, the layer of first gate oxide having a thickness; and a gate formed over the layer of first gate oxide; the first transistor conducting more than a leakage current when the gate, the source, and the first semiconductor region are connected to a same potential; a second transistor having: a second semiconductor region; spaced-apart source and drain regions formed in the second semiconductor region; a second channel defined between the source and drain regions formed in the second semiconductor region, the second channel having a second channel length and a second dopant concentration; a layer of second gate oxide formed over the second channel, the layer of second gate oxide having a thickness, the thickness of the layer of first gate oxide being substantially less than the thickness of the layer of second gate oxide; and a gate formed over the layer of second gate oxide; the second transistor being substantially non-conductive when the gate of the second transistor, the source of the second transistor, and the second semiconductor region are connected to a same potential, the first channel length being approximately 30 percent to 80 percent as long as the second channel length; and a third transistor formed in the semiconductor material, the third transistor having a third channel and a layer of third gate oxide formed over the third channel, the third channel having a third channel length and a third dopant concentration, the layer of third gate oxide having a thickness, the third transistor being substantially non-conductive when zero volts are applied to the gate, the thickness of the layer of third gate oxide being substantially equal to the thickness of the layer of first gate oxide.