Patent ID: 7675327
Filing Date: 2010-03-09
Classification: H01L

Abstract:
1. A semiconductor device comprising a bootstrap circuit, the bootstrap circuit comprising: a selection transistor that is an n-channel MOS transistor; a boosting transistor; and a boosting capacitor, wherein a drain of the selection transistor is connected to a gate of the boosting transistor and one terminal of the boosting capacitor, and another terminal of the boosting capacitor is connected to a source of the boosting transistor, a signal generated by boosting, with the boosting capacitor, voltages of input signals inputted to a source of the selection transistor and the source of the boosting transistor, is applied to the drain of the selection transistor and a gate of the boosting transistor when the selection transistor is in a state of off, a gate length of the selection transistor is set to be smaller than a gate length of the boosting transistor such that the selection transistor operates at a high speed, and a gate oxide film thickness of the selection transistor is equal to a gate oxide film thickness of the boosting transistor.