| 摘要 |
A boost voltage generating circuit includes a boost voltage producing circuit having a first and a second capacitor receiving a first and a second control signal, respectively, a third smoothing capacitor connected at an output terminal, and a first, a second, a third, and a fourth transistor. A boost output voltage is derived through the third and fourth transistors. The boost voltage producing circuit further includes a fourth capacitor connected between the first capacitor and the gate of the third transistor; a fifth capacitor connected between the second capacitor and the gate of the fourth transistor; a fifth transistor having one of a source and a drain connected to the first capacitor with the other thereof connected to the gate of the third transistor and a gate connected to the second capacitor; and a sixth transistor having one of a source and a drain connected to the second capacitor with the other thereof connected to the gate of the fourth transistor and a gate connected to the first capacitor. The arrangement enables to maintain the gate potential of the third and fourth transistors above a predetermined level, thereby preventing the lowering of current driving capability of these transistors and the lowering of current supplying capability for a boost potential.
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