Semiconductor memory device
View Patent ↗Disclosed herein is an internal voltage generation circuit of a semiconductor memory device which is capable of supplying voltages of different levels to a column path & control logic and data path & control logic in the memory device according to different operation modes of the memory device. The column path & control logic and data path & control logic are applied with a normal operating voltage when they are involved in the current operation mode of the memory device, whereas with a lower voltage when they are not involved. Therefore, the present invention has the effect of efficiently managing internal voltages of the semiconductor memory device and reducing current leakage of the memory device and, in turn, unnecessary power consumption thereof.
1. A semiconductor memory device comprising:
reference voltage generation means for generating a first reference voltage and a second reference voltage as control signals for internal voltage supply;
first internal voltage generation means for generating a first internal voltage of a desired level in response to said first reference voltage from said reference voltage generation means;
enable signal generation means for generating an enable signal by performing a logical operation in response to an active control signal indicative of an active mode and a refresh control signal indicative of a refresh mode;
reference voltage transfer means responsive to the enable signal resulting from the logical operation of the active control signal indicative of the active mode and the refresh control signal indicative of the refresh mode and said first and second reference voltages from said reference voltage generation means, for transferring said first reference voltage when said memory device is in said active mode and said second reference voltage when said memory device is in any other mode including said refresh mode;
second internal voltage generation means responsive to an output voltage from said reference voltage transfer means for generating a second internal voltage of the same level as that of said first internal voltage if the output voltage is said first reference voltage and a third internal voltage of a level lower than that of said first internal voltage if the output voltage is said second reference voltage;
a row path and control logic supplied to said first internal voltage; and
a column path and control logic and a data path and control logic supplied to said second internal voltage in said active mode, said third internal voltage in said refresh mode.
2. A semiconductor memory device as set forth in claim 1 , wherein said first internal voltage generation means includes:
current mirror amplification means for comparing said first internal voltage with said first reference voltage to obtain a difference therebetween and amplifying the obtained difference; and
pull-up means for raising the level of said first internal voltage to that of said first reference voltage if it becomes lower than the level of said first reference voltage.
3. A semiconductor memory device as set forth in claim 1 , wherein said second internal voltage generation means includes:
current mirror amplification means for comparing said second or third internal voltage with said first or second reference voltage to obtain a difference therebetween and amplifying the obtained difference; and
pull-up means for raising the level of said second or third internal voltage to that of said first or second reference voltage if it becomes lower than the level of said first or second reference voltage.
4. A semiconductor memory device as set forth in claim 1 , wherein:
said first internal voltage generation means includes:
first current mirror amplification means for comparing said first internal voltage with said first reference voltage to obtain a difference therebetween and amplifying the obtained difference; and
first pull-up means for raising the level of said first internal voltage to that of said first reference voltage if it becomes lower than the level of said first reference voltage; and
said second internal voltage generation means includes:
second current mirror amplification means for comparing said second or third internal voltage with said first or second reference voltage to obtain a difference therebetween and amplifying the obtained difference; and
second pull-up means for raising the level of said second or third internal voltage to that of said first or second reference voltage if it becomes lower than the level of said first or second reference voltage.