Patent ID: 6747897
Filing Date: 2004-06-08
Classification: G11C,H01L

Abstract:
A semiconductor charge pump circuit, comprising:basic pump cells connected in N stages where N is a natural number of equal to or greater than three, wherein: each cell is formed by connecting a control terminal of a transistor and a first driving terminal of the transistor and connecting the control terminal and a first end of a capacitor, the basic pump cells are connected in N stages by connecting a second driving terminal of a transistor of one basic pump cell to a first driving terminal of a transistor of a next-stage basic pump cell, a second end of the capacitor of each basic pump cell receives a clock having a different phase from a clock which is input to the capacitor of an immediately previous-stage basic pump cell and the capacitor of an immediately subsequent-stage basic pump cell, the basic pump cells connected in N stages are driven at a plurality of phase timings so as to pump a voltage, the transistor of at least one of the basic pump cells includes a substrate well, and the semiconductor charge pump circuit further includes a switching element for applying, as the clock, a voltage waveform from the basic pump cell, immediately previous to the switching element, to the second of the capacitor connected to the control end of the transistor including the substrate well and to the substrate well of the transistor during a pumping operation, the voltage waveform being pumped with the same phase timing of that of the voltage of the capacitor on the side of the control terminal of the transistor connected to the capacitor.