Half power supply voltage generator and semiconductor memory device using the same
First Claim
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1. A power supply voltage generating circuit for generating an output voltage, comprising:
- first active resistor means connected between a supply voltage and a first node, the first active resistor means having a resistance that varies responsive to the output voltage;
first passive resistor means connected in parallel to the first active resistor means;
first voltage regulating means connected between the first node and a second node adapted to regulate a voltage at the first node responsive to a voltage at the second node;
second voltage regulating means connected between the second node and a third node adapted to regulate the voltage at the second node responsive to a voltage at the third node;
second active resistor means connected between the third node and a ground voltage terminal, the second active resistor means having a resistance that varies responsive to the output voltage;
second passive resistor means connected in parallel with the second active resistor means;
a pull-up transistor connected between the supply voltage and the output voltage and adapted to pull up the output voltage responsive to the voltage at the first node; and
a pull-down transistor connected between the ground voltage and the output voltage and adapted to pull down the output voltage responsive to the voltage at the third node.
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Abstract
The present invention relates to a half power supply voltage generating circuit and a semiconductor memory device having the same. The half power supply voltage generating circuit according to the present invention includes components that allow it to operate regardless of whether the power supply falls below a threshold voltage of included MOS transistors.
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Citations
23 Claims
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1. A power supply voltage generating circuit for generating an output voltage, comprising:
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first active resistor means connected between a supply voltage and a first node, the first active resistor means having a resistance that varies responsive to the output voltage;
first passive resistor means connected in parallel to the first active resistor means;
first voltage regulating means connected between the first node and a second node adapted to regulate a voltage at the first node responsive to a voltage at the second node;
second voltage regulating means connected between the second node and a third node adapted to regulate the voltage at the second node responsive to a voltage at the third node;
second active resistor means connected between the third node and a ground voltage terminal, the second active resistor means having a resistance that varies responsive to the output voltage;
second passive resistor means connected in parallel with the second active resistor means;
a pull-up transistor connected between the supply voltage and the output voltage and adapted to pull up the output voltage responsive to the voltage at the first node; and
a pull-down transistor connected between the ground voltage and the output voltage and adapted to pull down the output voltage responsive to the voltage at the third node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Half power supply voltage generating circuit, comprising:
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first passive resistor means connected between a supply voltage terminal and a first node;
first active resistor means connected between the supply voltage terminal and the first node, the first active resistor means operating responsive to an output voltage terminal;
first voltage regulating means connected between the first node and a second node and adapted to regulate a voltage at the first node responsive to a voltage at the second node;
second voltage regulating means connected between the second node and a third node and adapted to regulate the voltage at the second node responsive to a voltage at the third node;
second active resistor means connected between the third node and a ground voltage terminal, the second active resistor means operating responsive to an output voltage terminal;
second passive resistor means connected between the third node and the ground voltage terminal;
a pull-up transistor connected between the power supply voltage terminal and the output voltage for pulling up the output voltage responsive to the voltage at the first node; and
a pull-down transistor connected between the third node and the ground voltage terminal for pulling down the output voltage responsive to the voltage at the third node. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A semiconductor memory device, comprising:
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a memory cell array including a plurality of memory cells formed at intersections of a plurality of word lines and a plurality of bit lines;
a pre-charging means adapted to pre-charge the plurality of bit lines with a half power supply voltage; and
a half power supply voltage generating means adapted to generate the half power supply voltage;
wherein the half supply voltage generating means includes;
first active resistor means connected between a supply voltage and a first node, the first active resistor means having a resistance that varies responsive to the output voltage;
first passive resistor means connected in parallel to the first active resistor means;
first voltage regulating means connected between the first node and a second node adapted to regulate a voltage at the first node responsive to a voltage at the second node;
second voltage regulating means connected between the second node and a third node adapted to regulate the voltage at the second node responsive to a voltage at the third node;
second active resistor means connected between the third node and a ground voltage terminal, the second active resistor means having a resistance that varies responsive to the output voltage;
second passive resistor means connected in parallel with the second active resistor means;
a pull-up transistor connected between the supply voltage and the output voltage and adapted to pull up the output voltage responsive to the voltage at the first node; and
a pull-down transistor connected between the ground voltage and the output voltage and adapted to pull down the output voltage responsive to the voltage at the third node.
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23. A semiconductor memory device, comprising:
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a memory cell array including a plurality of memory cells formed at intersections of a plurality of word lines and a plurality of bit lines;
a pre-charging means adapted to pre-charge the plurality of bit lines with a half power supply voltage; and
a half power supply voltage generating means adapted to generate the half power supply voltage;
wherein the half supply voltage generating means includes;
first passive resistor means connected between a supply voltage terminal and a first node;
first active resistor means connected between the supply voltage terminal and the first node, the first active resistor means operating responsive to an output voltage terminal;
first voltage regulating means connected between the first node and a second node and adapted to regulate a voltage at the first node responsive to a voltage at the second node;
second voltage regulating means connected between the second node and a third node and adapted to regulate the voltage at the second node responsive to a voltage at the third node;
second active resistor means connected between the third node and a ground voltage terminal, the second active resistor means operating responsive to an output voltage terminal;
second passive resistor means connected between the third node and the ground voltage terminal;
a pull-up transistor connected between the power supply voltage terminal and the output voltage for pulling up the output voltage responsive to the voltage at the first node; and
a pull-down transistor connected between the third node and the ground voltage terminal for pulling down the output voltage responsive to the voltage at the third node.
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Specification