Semiconductor device
View Patent ↗A sense amplifier capable of performing high-speed data sense operation with lower power consumption using a minuscule signal from a memory cell even in a case where a memory array voltage is reduced. A plurality of drive switches for over-driving are distributively arranged in a sense amplifier area, and a plurality of drive switches for restore operation are concentratively disposed at one end of a row of the sense amplifiers. A potential for over-driving is supplied using a meshed power line circuit. Through the use of the drive switches for over-driving, initial sense operation can be performed on data line pairs with a voltage having an amplitude larger than a data-line amplitude, allowing implementation of high-speed sense operation. The distributed arrangement of the drive switched for over-driving makes it possible to dispersively supply current in sense operation, thereby reducing a difference in sense voltage with respect to far and near positions of the sense amplifiers.
1. A semiconductor device comprising:
a plurality of word lines, a plurality of data lines, and a plurality of DRAM memory cells;
a plurality of sense amplifiers coupled to said plurality of data lines and each receiving operating voltage from first and second nodes;
a first line connected to said first nodes;
a second line connected to said second nodes; and
a third line coupled to said second nodes,
wherein each of said plurality of sense amplifiers includes a first NMISFET pair arranged in a cross-coupled form and a first PMISFET pair arranged in a cross-coupled form,
wherein said first NMISFET pair has said first node and said first PMISFET pair has said second node,
wherein said first line supplies a first potential to said first nodes,
wherein said second line supplies a second potential larger than the first potential to said second nodes,
wherein said third line supplies a third potential larger than the second potential to said second nodes, and
wherein said third line is arranged between said first and second lines.
2. A semiconductor device according to claim 1 , further comprising:
a fourth line coupled to said first nodes,
wherein said fourth line supplies a fourth potential lower than the first potential, and
wherein said fourth line is arranged between said second and third lines.
3. A semiconductor device according to claim 2 ,
wherein said first to fourth lines are formed above said first NMISFET pair and said first PMISFET pair.
4. A semiconductor device according to claim 1 , further comprising:
a drive MISFET coupled between said second node and third line.
5. A semiconductor device according to claim 4 ,
wherein said drive MISFET is arranged between said first NMISFET pair and said first PMISFET pair.
6. A semiconductor device according to claim 1 ,
wherein said first to third lines are formed above said first NMISFET pair and said first PMISFET pair.
7. A semiconductor device according to claim 1 ,
wherein said second nodes are supplied the third potential via said third line in a first period and the second potential via said second line in a second period after the first period.
8. A semiconductor device comprising:
a plurality of word lines, a plurality of data lines, and a plurality of DRAM memory cells;
a plurality of sense amplifiers coupled to said plurality of data lines and each receiving operating voltage from first and second nodes;
a first line connected to said second nodes;
a second line connected to said second nodes; and
a third line coupled to said first nodes,
wherein each of said plurality of sense amplifiers includes a first NMISFET pair arranged in a cross-coupled form and a first PMISFET pair arranged in a cross-coupled form,
wherein said first NMISFET pair has said first node and said first PMISFET pair has said second node,
wherein said first line supplies a first potential to said first nodes,
wherein said second line supplies a second potential lower than the first potential to said second nodes,
wherein said third line supplies a third potential lower than the second potential to said first nodes, and
wherein said third line is arranged between said first and second lines.
9. A semiconductor device according to claim 8 , further comprising:
a drive MISFET coupled between said second node and said first line.
10. A semiconductor device according to claim 9 ,
wherein said drive MISFET is arranged between said first NMISFET pair and said first PMISFET pair.
11. A semiconductor device according to claim 10 ,
wherein said first to third lines are formed above said first NMISFET pair, said first PMISFET pair and said drive MISFET.
12. A semiconductor device according to claim 8 ,
wherein said first nodes are supplied the first potential via said first line in a first period and the second potential via said second line in a second period after the first period.
13. A semiconductor device comprising:
a plurality of word lines, a plurality of data lines, and a plurality of DRAM memory cells;
a plurality of sense amplifiers coupled to said plurality of data lines and each receiving operating voltage from first and second nodes;
a first line connected to said first nodes;
a second line coupled to said second nodes; and
a third line coupled to said first nodes via a switch MISFET,
wherein each of said plurality of sense amplifiers includes a first NMISFET pair arranged in a cross-coupled form and a first PMISFET pair arranged in a cross-coupled form,
wherein said first NMISFET pair has said first node and said first PMISFET pair has said second node, and
wherein said third line is arranged between said first and second lines.
14. A semiconductor device according to claim 13 ,
wherein said switch MISFET is arranged between said first NMISFET pair and said first PMISFET pair.
15. A semiconductor device according to claim 14 ,
wherein said first to third lines are formed above said first NMISFET pair, said first PMISFET pair, and said switch MISFET.
16. A semiconductor device according to claim 13 ,
wherein said first line supplies a first potential to said first nodes,
wherein said second line supplies a second potential higher than the first potential to said second nodes, and
wherein said third line supplies a third potential lower than the first potential.
17. A semiconductor device according to claim 16 ,
wherein said first nodes are supplied the third potential via said third line in a first period and the first potential via said first line in a second period after the first period.