Voltage regulating circuit and method of regulating voltage
First Claim
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1. A voltage regulating circuit comprising:
- a core voltage terminal to which a core voltage of a semiconductor memory device is supplied;
a reference voltage generator for outputting a reference voltage by dividing the core voltage;
a controller for changing the reference voltage in response to a test mode voltage-up signal and a test mode voltage-down signal in a test mode without adjusting the core voltage;
a bitline precharge voltage generator for outputting a bitline precharge voltage in response to the reference voltage; and
a cell plate voltage generator for outputting a cell plate voltage in response to the reference voltage, andwherein the test mode voltage-up and voltage-down signals are independently controlled.
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Abstract
Provided is concerned with a voltage regulation circuit and method of regulating the voltage, including a reference voltage generator for generating a reference voltage by dividing a core voltage of a semiconductor memory device, a controller for controlling the reference voltage generator to adjust the reference voltage without handling the core voltage in response to a test signal of a test mode, and a voltage generator for generating a bit-line precharging voltage and/or a cell plate voltage in accordance with the reference voltage.
14 Citations
10 Claims
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1. A voltage regulating circuit comprising:
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a core voltage terminal to which a core voltage of a semiconductor memory device is supplied; a reference voltage generator for outputting a reference voltage by dividing the core voltage; a controller for changing the reference voltage in response to a test mode voltage-up signal and a test mode voltage-down signal in a test mode without adjusting the core voltage; a bitline precharge voltage generator for outputting a bitline precharge voltage in response to the reference voltage; and a cell plate voltage generator for outputting a cell plate voltage in response to the reference voltage, and wherein the test mode voltage-up and voltage-down signals are independently controlled. - View Dependent Claims (2, 3, 4, 5)
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6. A voltage regulating circuit comprising:
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a core voltage terminal to which a core voltage of a semiconductor memory device is supplied; a reference voltage generator for outputting a reference voltage by dividing the core voltage in accordance with a ratio of resistors connected between the core voltage terminal and a ground terminal; an inverter inverting a test mode voltage-up signal; a first transistor for increasing the reference voltage by inactivating one of the resistors which is connected to the core voltage terminal in response to an inverted test mode voltage-up signal without adjusting the core voltage; a second transistor for decreasing the reference voltage by inactivating the other one of the resistors which is connected to the ground terminal in response to a test mode voltage-down signal without adjusting the core voltage; a bitline precharge voltage generator for outputting a bitline precharge voltage in response to the reference voltage; and a cell plate voltage generator for outputting a cell plate voltage in response to the reference voltage, and wherein the test mode voltage-up and voltage-down signals are independently controlled. - View Dependent Claims (7, 8, 9)
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10. A method of regulating a voltage, comprising:
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generating a bitline precharge voltage and/or a cell plate voltage with using a reference voltage provided from a reference voltage generator in response to a core voltage; increasing the reference voltage by controlling the reference voltage generator in response to an inverted test mode voltage-up signal without adjusting the core voltage and increasing the bitline precharge voltage and/or the cell plate voltage with using the increased reference voltage; and decreasing the reference voltage by controlling the reference voltage generator in response to test mode voltage-down signal without adjusting the core voltage and decreasing the bitline precharge voltage and/or the cell plate voltage with using the decreased reference voltage, and wherein the test mode voltage-up and voltage-down signals are independently controlled.
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Specification