Internal power voltage generating circuit, semiconductor memory device and semiconductor device

摘要

The invention is an internal power voltage generating circuit, adjusted such that an internal power voltage becomes the reference voltage. The internal power voltage generating circuit further includes: a charge share circuit, including a charging capacitor, an initial voltage adjusting circuit and a charge reset circuit. The charging capacitor is connected to a differential amplifier via a switch circuit, and is charged by charges of a control voltage. The initial voltage adjusting circuit adjusts and applies an initial voltage to the charging capacitor. The charge reset circuit discharges the charging capacitor. When the internal power voltage is lower than a reference voltage, the charging capacitor having the initial voltage is connected to the differential amplifier, and the charges of the control voltage are transferred to the charging capacitor during a transfer period.

主权项

1. An internal power voltage generating circuit, comprising: a differential amplifier, comparing an internal power voltage supplied to a load circuit with a predetermined first reference voltage and outputting from an output terminal a control voltage showing a comparison result; and a driving transistor, driving an external power voltage according to the control voltage and outputting the internal power voltage, wherein the internal power voltage generating circuit is adjusted such that the internal power voltage becomes the first reference voltage, wherein the internal power voltage generating circuit further comprises:
a charge share circuit, comprising a charging capacitor, an initial voltage adjusting circuit and a charge reset circuit, wherein the charging capacitor is connected to the output terminal of the differential amplifier via a switch circuit, and is charged by charges of the control voltage, the initial voltage adjusting circuit adjusts and applies a predetermined initial voltage to the charging capacitor, and the charge reset circuit discharges the charging capacitor; and a control means, turning on the switch circuit when the internal power voltage is lower than a predetermined second reference voltage, thereby connecting the charging capacitor having the initial voltage to the output terminal of the differential amplifier, transferring the charges of the control voltage to the charging capacitor during a predetermined transfer period, then turning off the switch circuit, and then transferring the charges of the charging capacitor by the charge reset circuit during a predetermined reset period.