Semiconductor memory device for sensing voltages of bit lines in high speed
View Patent ↗A semiconductor memory device for sensing voltages of bit lines in high speed includes: a first bit line pair to a fourth bit line pair each coupled to a different unit cell array; a bit line sense amplifying unit coupled to the first bit line pair to the fourth bit line pair for amplifying data transmitted through the first bit line pair to the fourth bit line pair; and a switching block for connecting one of the first bit line pair to the fourth bit line pair with the bit line sense amplifying unit in response to a control signal.
1. A semiconductor memory device, comprising:
a plurality of pairs of bit lines extending in parallel in a column direction;
a plurality of word lines extending in parallel in a row direction;
a plurality of memory cell array blocks each having a predetermined number of the word lines; and
a plurality of sense amplifier array blocks each of which is disposed, in plan view, between every pair of adjacent memory cell array blocks and has a plurality of first bit line sense amplifying means each arranged for every four bit line pairs in four different memory cell array blocks, respectively,
wherein the first bit line sense amplifying means includes:
a sense amplifier for sensing and amplifying a voltage level between a first node and a second node;
a first switching means for making a selective connection between (i) a first bit line pair of a first memory cell array block and (ii) the first node and the second node, respectively;
a second switching means for making a selective connection between (i) a first bit line pair of a second memory cell array block and (ii) the first node and the second node, respectively;
a third switching means for making a selective connection between (i) a second bit line pair of a third memory cell array block and (ii) the first node and the second node, respectively; and
a fourth switching means for making a selective connection between (i) a second bit line pair of a fourth memory cell array block and (ii) the first node and the second node, respectively.
2. The semiconductor memory device of claim 1 , wherein each memory cell array block includes first and second bit line pairs neighboring with each other.
3. The semiconductor memory device of claim 2 , wherein each first bit line sense amplifying means is disposed between the first memory cell array block and the second memory cell array block located in proximity among the plurality of memory cell array blocks for sensing and amplifying a voltage level of a bit line pair selected as one of (i) each first bit line pair of the first memory cell array block and the second cell array block and (ii) each second bit line pair of the third memory cell array block and the fourth memory cell array block, and
the third memory cell array block is disposed adjacent to a top portion of the first memory cell array block and the fourth memory cell array block is disposed adjacent to a bottom portion of the second memory cell array block.
4. The semiconductor memory device of claim 3 , wherein the sense amplifier array blocks further include:
a second bit line sense amplifying means being disposed in a top portion of the third memory cell array block for sensing and amplifying a voltage level of one bit line pair selected from (a) a first bit line pair of the third memory cell array block and (b) a second bit line pair of the first memory cell array block.
5. The semiconductor memory device of claim 4 , wherein the second bit line sense amplifying means includes:
a sense amplifier for sensing and amplifying a voltage level between a third node and a fourth node;
a fifth switching means for making a selective connection between the first bit line pair of the third memory cell array block and one of the third node and the fourth node; and
a sixth switching means for making a selective connection between the second bit line pair of the second memory cell array block and one of the third node and the fourth node.
6. The semiconductor memory device of claim 4 , wherein the second bit line pair of the third memory cell array block is connected with the first bit line sense amplifying means though a first interconnection, and the second bit line pair of the first memory cell array block is connected with the second bit line sense amplifying means though a second interconnection line disposed in a different layer from the first interconnection line.
7. A semiconductor memory device, comprising:
a plurality of pairs of bit lines extending in parallel in a column direction;
a plurality of word lines extending in parallel in a row direction;
a plurality of memory cell array blocks each having a predetermined number of the word lines; and
a plurality of sense amplifier array blocks each of which is disposed, in plan view, between every pair of adjacent memory cell array blocks and has a plurality of bit line sense amplifiers;
wherein each of said bit line sense amplifiers is connected to four different bit line pairs in four different memory cell array blocks, respectively, for selectively sensing amplifying a voltage level of each of said four different bit line pairs,
wherein each bit line sense amplifier is adapted to for sensing and amplifying a voltage level between first and second nodes; and
wherein said memory device further comprises, for each bit line sense amplifier:
a first switch for making a selective connection between (i) a first bit line pair of a first memory cell array block and (ii) the first node and the second node, respectively;
a second switch for making a selective connection between (i) a first bit line pair of the second memory cell array block and (ii) the first node and the second node, respectively;
a third switch for making a selective connection between (i) a second bit line pair of a third memory cell array block and (ii) the first node and the second node, respectively; and
a fourth switch for making a selective connection between (i) a second bit line pair of a fourth memory cell array block and (ii) the first node and the second node, respectively.
8. The semiconductor memory device of claim 6 , wherein each memory cell array block includes first and second bit line pairs neighboring to each other.
9. The semiconductor memory device of claim 8 , wherein each bit line sense amplifier is
disposed between the first and second memory cell array blocks which, in turn, are disposed between third and fourth memory cell array blocks; and
connected to the first bit line pair of the first memory cell, the first bit line pair of the second cell array block, the second bit line pair of the third memory cell array block, and the second bit line pair of the fourth memory cell array block.
10. A bit line sense amplifying unit for a semiconductor memory device,
said memory device comprising:
a plurality of pairs of bit lines extending in parallel in a column direction:
a plurality of word lines extending in parallel in a row direction:
a plurality of memory cell array blocks each having a predetermined number of the word lines; and
a plurality of sense amplifier array blocks each of which is disposed, in plan view, between every pair of adjacent memory cell array blocks and has a plurality of bit line sense amplifiers:
wherein each of said bit line sense amplifiers is connected to four different bit line pairs in four different memory cell array blocks, respectively, for selectively sensing amplifying a voltage level of each of said four different bit line pairs,
said bit line sense amplifying unit comprising:
one of said bit line sense amplifiers for sensing and amplifying a voltage level between a first node and a second node;
a first switching means for making a selective connection between (i) a first bit line pair of a first memory cell array block and (ii) the first node and the second node, respectively;
a second switching means for making a selective connection between (i) a first bit line pair of a second memory cell array block and (ii) the first node and the second node, respectively;
a third switching means for making a selective connection between (i) a second bit line pair of a third memory cell array block and (ii) the first node and the second node, respectively; and
a fourth switching means for making a selective connection between (i) a second bit line pair of a fourth memory cell array block and (ii) the first node and the second node, respectively.
11. The bit line sense amplifying unit of claim 10 , wherein the sense amplifier is disposed between the first and second memory cell array blocks.
12. The bit line sense amplifying unit of claim 11 , wherein the first and second memory cell array blocks are disposed between the third and fourth memory cell array blocks.