Patent ID: 7365591

Claim:
A voltage generating circuit comprising: a first P-type transistor directly connected between a precharge voltage supply node supplying a precharge voltage and a first internal node, and having a control electrode connected to a second internal node, said precharge voltage supply node being normally isolated from a node supplying a fixed voltage with a constant voltage level regardless of a voltage level at said precharge voltage supply node, and the precharge voltage supply node directly receiving a second control signal controlling charge accumulation, said second control signal varying between ground and the precharge voltage level so as to attain the ground and the precharge voltage level; a first capacitance element connected between a first input node receiving a first control signal for precharging and said second internal node; a second P-type transistor connected between the first and second internal nodes, and having a control electrode receiving a second control signal; a third P-type transistor connected between said first internal node and an output node, and having a control electrode connected to a third internal node, configured to produce a positive boosted voltage higher than said precharge voltage at said output node; a fourth P-type transistor connected between said output node and said third internal node, and having a control electrode connected to said first internal node; a second capacitance element connected between a third input node receiving a third control signal controlling second charge precharging and said first internal node; and a third capacitance element connected between a fourth input node receiving a fourth control signal controlling charge transfer and said third internal node.