| 摘要 |
PROBLEM TO BE SOLVED: To provide an oscillator used for semiconductor memories and capable of reducing power consumption. SOLUTION: When the voltage V1 of a comparison node N1 becomes larger than a first reference voltage Vref1, a differential amplifier 101 inside the oscillator 1 makes a pulse generating circuit 110 output pulses. When the pulses are output, the comparison node N1 is discharged by a charging/discharging circuit 105. At this point, a control circuit 4 inactivates a first control signal CT1 and stops the differential amplifier 101. After the comparison node N1 is discharged, it is gradually charged by the charging/discharging circuit 105. As a result, when the voltage V1 exceeds a second reference voltage Vref2 which is the total of threshold voltages of a discharging circuit 43, the control circuit 4 activates the first control signal CT1 and operates the differential amplifier 101. COPYRIGHT: (C)2005,JPO&NCIPI
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