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US 8,134,858 B2Granted
Semiconductor device for supplying stable voltage to control electrode of transistor
AssigneeElpida Memory, Inc.
InventorTatsuya Matano
Life of this patent
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Abstract
A semiconductor device comprises an internal voltage generator circuit which includes a first transistor having a first and a second main electrode and a control electrode, a control circuit controlling a voltage between the second main electrode and the control electrode of the first transistor such that a voltage at the first main electrode of the first transistor remains at a predetermined voltage, and a second transistor having a first and a second main electrode and a control electrode. A voltage between the second main electrode and the control electrode of the first transistor is applied between the second main electrode and the control electrode of the second transistor.
Claims14
A semiconductor device comprising an internal voltage generator circuit said internal voltage generator circuit comprising:
- a first transistor having a first and a second main electrode and a control electrode;
- a control circuit controlling a voltage between said second main electrode and said control electrode of said first transistor such that a voltage at said first main electrode of said first transistor remains at a predetermined voltage;
- a second transistor having a first and a second main electrode and a control electrode, a voltage between said second main electrode and said control electrode of said first transistor being applied to between said second main electrode and said control electrode of said second transistor;
- a load circuit connected to said first main electrode of said second transistor, wherein said second transistor is larger in current supply capability than said first transistor;
- and
- a switch disposed between said first main electrode of said second transistor and said load circuit,
- wherein a first and a second internal voltage generator circuits are provided as two of said internal voltage generator circuits, each of said first and said second internal voltage generator circuits having a variable resistor connected to said first main electrode of said first transistor,
- said load circuit is a storage element storing information corresponding to a High level or a Low level, and
- said variable resistor included in said first internal voltage generator circuit has a resistance value previously set such that said information corresponding to said High level can be stored in said storage element, and said variable resistor included in said second internal voltage generator circuit has a resistance value previously set such that said information corresponding to said Low level can be stored in said storage element.
6 more elements
A semiconductor device comprising;
- a first terminal;
- a first internal voltage generator circuit which comprises a first transistor including a first control electrode and first and second main electrodes, a first control circuit controlling a first bias voltage across the first control electrode and the first main electrode of the first transistor such that the second main electrode of the first transistor maintains a first reference voltage, and a second transistor including a second control electrode and a third main electrode controlled by the first bias voltage thereacross and a fourth electrode from which a first internal voltage is derived;
- a second internal voltage generator circuit which comprises a third transistor including a third control electrode and fifth and sixth main electrodes, a second control circuit controlling a second bias voltage across the third control electrode and the fifth main electrode of the third transistor such that the sixth main electrode of the third transistor maintains a second reference voltage, and a fourth transistor including fourth control electrode and a seventh main electrode controlled by the second bias voltage thereacross and an eighth electrode from which a second internal voltage is derived;
- a first switch provided between the first terminal and the first internal voltage generator circuit to control supplying the first terminal with the first internal voltage;
- a second switch provided between the first terminal and the second internal voltage generator circuit to control supplying the first terminal with the second internal voltage;
- and
- a memory element electrically connected to the first terminal, the memory element being capable of storing either one of reset data and set data, wherein a potential of the first internal voltage is related to the reset data, and a potential of the second internal voltage is related to the set data.
4 more elements
A semiconductor device comprising:
- a terminal;
- a first internal voltage generator which comprises a first transistor including a first control electrode and first and second main electrodes, a first control circuit controlling a first bias voltage across the first control electrode and the first main electrode of the first transistor such that the second main electrode of the first transistor maintains a first reference voltage, and a second transistor including a second control electrode and a third main electrode controlled by the first bias voltage thereacross and a fourth main electrode from which a first internal voltage is derived;
- a second internal voltage generator which comprises a third transistor including a third control electrode and fifth and sixth main electrodes, a second control circuit controlling a second bias voltage across the third control electrode and the fifth main electrode of the third transistor such that the sixth main electrode of the third transistor maintains a second reference voltage which is different from the first reference voltage, and a fourth transistor including fourth control electrode and a seventh main electrode controlled by the second bias voltage thereacross and an eight main electrode from which a second internal voltage is derived, the second internal voltage being different from the first internal voltage;
- a first switch provided to control supplying the terminal with the first internal voltage;
- and
- a second switch provided to control supplying the terminal with the second internal voltage.
3 more elements
Dependencies are inferred from the claim text.