Patent ID: 6415007
Filing Date: 2002-07-02
Classification: G11C,H02M,H03L

Abstract:
A charge pump comprising:a first sub charge pump having a plurality of transistors for performing charging and discharging operations; and a second sub charge pump having a charging/discharging terminal common to that of the first sub charge pump, the second sub charge pump discharging electricity which is charged via the charging/discharging terminal when the first sub charge pump has performed a charging operation using electricity accumulated in a junction capacitor at a PN junction which exists between the transistors of the fist sub charge pump, the second sub charge pump charging electricity via the charging/discharging terminal when the first sub charge pump has performed a discharging operation to charge the junction capacitor; wherein the first sub charge pump performs the charging or discharging operation set by a signal of a pulse width corresponding to a first time period longer than a second time period for which electricity is charged into or discharged from the junction capacitor, while the second sub charge pump performs a charging or discharging operation set by a signal of a pulse width corresponding to the second time period for which electricity is charged into or discharged from the junction capacitor.