Constant voltage generation of semiconductor device
AssigneeSamsung Electronics Co., Ltd.
InventorYun-ho Choi
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Abstract
A constant voltage generator of a semiconductor device includes an oscillator for generating an AC signal, a charge pump for pumping charge from a power voltage supply line by a predetermined pumping ratio in accordance with the AC signal of the oscillator, a charge storage capacitor for storing the pumped charge, and a voltage limiter for limiting the voltage across the charge storage capacitor at a predetermined voltage level, then outputting a constant voltage. According to the present invention, the charge of the storage capacitor is quickly stored, a constant voltage is obtained independent of a power source voltage, and the reference voltage output can be greater than the power source voltage.
Claims7
A constant voltage generator of a semiconductor device comprising:
- an oscillator for generating an AC signal;
- a charge pump for pumping a charge from a power voltage supply line by a predetermined pumping ratio in accordance with the AC signal of said oscillator;
- a charge storage capacitor for storing the charge pumped by said charge pump;
- and
- a voltage limiter for limiting the voltage across said charge storage capacitor to a predetermined voltage, and outputting a constant voltage,
- wherein said charge pump is formed by a plurality of stages each including:
- an amplifier for amplifying said AC signal supplied from a preceding stage, which also delays said AC signal for a predetermined time interval;
- a pump capacitor for storing a charge while the state of said amplifier's output is low, and for discharging during the output's high state of the output;
- a first pump diode for supplying the charge from said power voltage supply line to said pump capacitor;
- and a second pump diode for supplying the charge stored in said pump capacitor to the pump capacitor of a succeeding stage.
Dependencies are inferred from the claim text.