WO2004042821A1 - 半導体記憶装置 - Google Patents
半導体記憶装置 Download PDFInfo
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- WO2004042821A1 WO2004042821A1 PCT/JP2002/011659 JP0211659W WO2004042821A1 WO 2004042821 A1 WO2004042821 A1 WO 2004042821A1 JP 0211659 W JP0211659 W JP 0211659W WO 2004042821 A1 WO2004042821 A1 WO 2004042821A1
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- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/06—Sense amplifiers; Associated circuits, e.g. timing or triggering circuits
- G11C7/062—Differential amplifiers of non-latching type, e.g. comparators, long-tailed pairs
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- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
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- G11C11/4087—Address decoders, e.g. bit - or word line decoders; Multiple line decoders
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- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
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- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
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- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
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- G11C29/1201—Built-in arrangements for testing, e.g. built-in self testing [BIST] or interconnection details comprising I/O circuitry
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- G11C7/1096—Write circuits, e.g. I/O line write drivers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0207—Geometrical layout of the components, e.g. computer aided design; custom LSI, semi-custom LSI, standard cell technique
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/30—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells
- H10B12/48—Data lines or contacts therefor
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- G11C2207/002—Isolation gates, i.e. gates coupling bit lines to the sense amplifier
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- G11C2207/00—Indexing scheme relating to arrangements for writing information into, or reading information out from, a digital store
- G11C2207/005—Transfer gates, i.e. gates coupling the sense amplifier output to data lines, I/O lines or global bit lines
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/30—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells
- H10B12/31—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells having a storage electrode stacked over the transistor
- H10B12/315—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells having a storage electrode stacked over the transistor with the capacitor higher than a bit line
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/50—Peripheral circuit region structures
Definitions
- the present invention relates to a random access memory, and more particularly to a memory for transmitting a signal read from a memory cell to a bit line to a peripheral circuit at a high speed by a gate input amplifier.
- Japanese Patent Application Laid-Open No. 11-306762 discloses an SRAM memory array in which a column sense amplifier CSA is provided for each bit line BL / BLB and connected to a global bit line GBIVGBLB as shown in FIG. Has been described.
- the column sense amplifier can be selectively activated by the block corresponding sense amplifier activation signal S and the Y address signal YB, and the power consumption can be reduced.
- the present inventors studied a control method for detecting the potential of a DRAM bit line with a so-called direct sense amplifier, which is a differential type Gout receiving amplifier.
- a direct sense amplifier which is a differential type Gout receiving amplifier.
- a large number of direct sense amplifiers (about 32 to 128) are connected to local 10 lines.
- the distance between the local 10 line and the main 10 line ahead is long and the load is large, and the gate length of the MOS transistor that is the differential pair to reduce the threshold offset is long.
- the gate width must be, for example, 4 jum or more. Therefore, in the configuration where all the differential pairs of the unselected direct sense amplifier can be seen, as in the case of the CSA in Fig. 23, the load capacity of the local 10 lines is large and high-speed operation is difficult.
- the DRAM bit line precharge level is VDIV2, which is half the power supply voltage or the level VDL obtained by stepping down the power supply voltage. Therefore, if a negative signal occurs on BL and the level of BL drops below VDL / 2, MN21 will cut off. Although the channel capacity of MN21 cannot be seen from the local 10 line, if a positive signal is generated on BL and the level of BL rises above VDL / 2, MN21 conducts and the channel capacity can be seen. The capacity of the local 10 lines greatly changes depending on the data pattern on the bit line. In other words, the operating speed greatly changes depending on the operating conditions, and the post-manufacturing test becomes complicated.
- the first problem to be solved by the present invention is to provide a configuration in which the direct sense amplifier can be selectively activated in a random access memory such as a DRAM or an SRAM, and at that time, the load capacity of the local 10 lines is reduced. Then, the data pattern dependency is further reduced.
- a second object of the present invention is to reduce noise in a direct sense amplifier when performing high-speed operation and to increase an operation margin.
- a third object of the present invention is to double the number of bits read from one memory array without increasing the chip size.
- the typical configuration of the present invention is as follows.
- the word line is extended in the first direction
- the first and second bit lines are extended in the second direction intersecting the first direction
- the word line and the bit line pair are connected.
- a memory cell an amplifier circuit for amplifying information read from the memory cell
- first and second IO lines for receiving information read from the amplifier circuit
- a source line for controlling the amplifier circuit.
- a semiconductor memory device comprising: first and second regions each having: a column selection line commonly connected to the first and second regions, and extending in the second direction.
- the gate of the first MOS transistor is connected to the first bit line, and the gate of the second MOS transistor is Connected to the second bit line,
- the sources of the first and second MOS transistors are connected to the source line
- the drain of the third MOS transistor is connected to the first IO line
- the source of the fourth MOS transistor is connected to the source line.
- the drain is connected to the second IO line, and the gates of the third and fourth MOS transistors respectively included in the amplifier circuit are commonly connected to the column selection line, and the first The drain of the MOS transistor is connected to the source of the third MOS transistor.
- the drain of the second MOS transistor is connected to the source of the fourth MOS transistor.
- the potentials of the first and second IO lines included in the first region are higher than the potentials of the source lines included in the first region, and the first and second IO lines included in the second region.
- the source line and the source line have the same potential.
- FIG. 1 shows a memory array and a sense amplifier of the present invention.
- FIG. 2 shows a chip configuration of a semiconductor memory device of the present invention and a configuration of a memory block.
- FIG. 3 is a layout of a memory array and a sectional view thereof.
- FIG. 4 is a circuit diagram of a sub-driver and a sub-driver array.
- FIG. 5 is a circuit diagram of the cross area.
- FIG. 6 is a circuit diagram of the main amplifier.
- FIG. 7 is a block diagram of a data path at the time of reading.
- FIG. 8 shows operation waveforms at the time of reading.
- FIG. 9 shows a continuation of the operation waveform at the time of reading.
- FIG. 10 is a block diagram of a data path at the time of writing.
- Figure 11 shows the operation waveform during writing.
- Figure 12 shows the continuation of the operation waveform during writing.
- FIG. 13 is a circuit diagram of the second sense amplifier.
- FIG. 14 is a circuit diagram of the third sense amplifier.
- FIG. 15 is a circuit diagram of the fourth sense amplifier.
- FIG. 16 shows the operation waveform of the third sense amplifier.
- FIG. 17 is a circuit diagram of the second main amplifier.
- FIG. 18 is a circuit diagram of the third main amplifier.
- FIG. 19 is a circuit diagram of the fourth main amplifier.
- FIG. 20 shows a second local 10 connection method of the present invention.
- FIG. 21 shows a second data path configuration of the present invention.
- FIG. 22 shows operation waveforms at the time of reading in the second data path.
- FIG. 23 is a block diagram of a column sense amplifier system in a conventional SRAM.
- FIG. 1 shows a memory array ARY and a sense amplifier SA of the present invention.
- FIG. 2 (a) shows a chip configuration of the semiconductor memory device of the present invention for explaining the function of the present sense amplifier.
- the whole chip CHIP is roughly divided into control circuit CNTL, input / output circuit DQC, and memory block BLK.
- a clock, an address, and a control signal are input to the control circuit from outside the chip, and a pre-decoding of an address for determining a chip operation mode is performed.
- the input / output circuit has an input / output buffer, receives write data from outside the chip, and outputs read data outside the chip.
- Figure 2 (b) shows the configuration of the memory block BLK.
- a memory array AEY arranged on multiple arrays is arranged, and around it, a sense amplifier array SAA, a subword driver array SWDA, and a cross area XP are arranged.
- a column decoder YDEC and a main amplifier column MAA are arranged in parallel with the sense amplifier columns, and a row decoder XDEC and an array control circuit ACC are arranged in parallel with the subword driver columns.
- FIG. 1 shows two memory arrays and a sense amplifier array between them.
- the sense amplifier SA of the present invention includes a transfer gate TGC, a precharge circuit PCC, a restore amplifier CC, a write circuit WP, and an amplifier, that is, a direct sense amplifier DSA.
- the transfer gate is a circuit that connects between the sense amplifier and the memory array when the sense amplifier separation signal SHR is activated.
- the precharge circuit equalizes between the paired bit lines when the precharge signal PC is activated, and precharges to the bit line precharge level.
- the bit line precharge level is usually set to the midpoint VDL / 2 of the bit line amplitude VDL (the same level as the power supply voltage VCC from the outside of the chip or a level lower than that).
- the precharge level can be set to the high level VDL and the low level VSS of the bit line without using a dummy cell for generating a reference voltage.
- the conductance of the direct sense amplifier described later increases when the bit line level is near VDL / 2, it is desirable to set the bit line precharge level to VDL / 2 for high-speed operation.
- the restore amplifier drives the P-side common source line CSP to VDL, drives the N-side common source line CSN to VSS, and connects the bit line BL to the bit line BL after a small read signal from the memory cell is generated on the bit line.
- This circuit amplifies the higher voltage of the BLB to VDL and the lower voltage to VSS.
- Write circuit WP is used for write when write column select line WYS is activated Local 10 lines WLIO This circuit connects WLIOB and bit line pairs.
- the WLIO is precharged to VBLR during standby to prevent current consumption in the unselected sense amplifier row.
- the direct sense amplifier DSA is a circuit that drives the local 10-line RLIO / RLIOB for reading with a small signal generated on the bit line and transmits the signal.
- RLIO is precharged to the 10-line precharge level VPC.
- the direct sense amplifier common source line DSAS is precharged to the 10-wire precharge level VPC during standby, and is driven to VSS during read operations.
- the size controlled by RYS between the MOS transistors MN0 and MN1 and the RLIO line is small (for example, the gate width MOS transistors MN2 and MN3 are inserted and separated, so in a non-selected direct sense amplifier where RYS is VSS, the channel capacitance of the differential pair cannot be seen from the RLIO line.
- the parasitic capacitance can be reduced, and the parasitic capacitance can be prevented from being changed by the data pattern on the bit line.
- the memory array includes a plurality of memory cells MC.
- the memory cell is configured as a twin cell configuration composed of two DRAM cells.
- a DRAM cell consists of one MOS transistor and one capacitor.One source or drain of the MOS transistor is connected to the bit line, the other source or drain is connected to the storage node SN, and the gate is connected to the word line. It is connected. One terminal of the capacitor is connected to the storage node SN, and the other terminal of the capacitor is connected to the plate electrode PL in common with other cells.
- Twin cells connect two DRAM cells to a common word line and a pair of bit lines, and write complementary data to the storage node of each cell to store information.
- the power of explaining the present invention using a twin cell The sense amplifier of the present invention is applicable even when one DRAM cell is used as a memory cell.
- the use of a twin cell almost doubles the signal amount of the bit line compared to the case of using only one DRAM cell.
- a direct sense amplifier as shown in Fig. 1 the signal generated from the memory cell can be converted to a current difference by the direct sense amplifier without being amplified by the restorer amplifier and read out to 10 local lines.
- the bit line The larger the signal amount, the larger the signal amount read to the local 10 lines. Therefore, the combination of the direct sense amplifier and the twin-cell system enables higher speed.
- Fig. 3 (a) shows the layout of the memory array
- Fig. 3 (b) shows a cross-sectional view taken along line A-A.
- the DRAM cell has an N-channel MOS transistor formed in the substrate PW and a stack capacitor provided above the bit line BL.
- the active region of the MOS transistor is indicated by ACT
- the word line is indicated by WL
- the N-type diffusion region is indicated by N. Active regions are separated by the insulator Si02.
- a contact CB is provided above the diffusion layer, and a bit line contact BC or a storage node contact SC is provided above the contact CB.
- the bit line BL is arranged above the bit line contact in a direction perpendicular to the word line.
- a concave storage node SN is placed above the storage node contact.
- a plate electrode PL is embedded inside the storage node, and these constitute a capacitor with the capacitive insulating film CI interposed therebetween.
- This memory array is an open type memory array in which DRAM cells are connected at the intersections of all bit lines and lead lines.
- the lead lines can be reduced to 2F (F: minimum processing size) and the bit line pitch can be reduced to 3F.
- two DRAM cells are used as one memory cell in order to form a twin-cell type memory cell.
- Two adjacent DRAM cells, such as MCa form a pair.
- two DRAM cells separated from each other may form a pair.
- the cell size becomes 12F2
- the area can be reduced as compared with the case of using two 2-intersection cells.
- the paired bit lines can be arranged on the same array, so that there is an advantage that noise at the time of sensing, which is a problem in the one-crossing point cell, does not occur.
- FIG. 4 shows a circuit diagram of a sub-driver SWD and a sub-driver array SWDA configured by arranging a plurality of sub-drivers.
- the sub-driver consists of two N-channel MOS transistors and one P-channel MOS transistor.
- One N-channel MOS transistor has a gate connected to the main line MWLB, a drain connected to the word line WL, and a source connected to the ground potential VSS.
- the other N-channel MOS transistor has the gate connected to the complementary word driver select line FXB, the drain connected to the word line WL, and the source connected to the ground potential VSS.
- the main word line MWLB is connected to the gate, the word line WL is connected to the drain, and the word driver select line FX is connected to the source. As shown in the figure, four sets of FX are wired on one SWDA, and one of the four SWDs selected by one MWLB is selected to activate one WL.
- the main driver is located above or adjacent to the sub-driver row. 10 wire pairs MIO / MIOB are wired.
- FIG. 5 shows the circuit diagram of the cross area XP.
- Cross area is SHR signal dry line SHD, RLIO line precharge circuit RPC, lead gate RGC, DSAS line dry line DSAD, WLIO line precharge circuit WPC, write gate WGC, CS line dry line CSD, CS line precharge
- the circuit consists of SPC, PC signal dry line, PCD, FX line driver FXD power.
- the SHR signal driver receives the complementary signal SHRB of the sense amplifier separation signal SHR and outputs the SHR.
- the RLIO line precharge circuit precharges the RLIO line to VPC when the read enable signal RE is at the inactive VSS level.
- the read gate connects the RLIO line to the main 10-line MIO / MIOB when the RE is in the active VCL state (same as the external VCC level or at a reduced level and used as the power supply voltage for peripheral circuits). Circuit.
- VPC is set to VCL / 2
- the ON current of the NMOS can be increased, so that the MIO load can be reduced as compared with the case of CMOS configuration, and the MIO line can be reduced. Can be increased.
- VPC is VCL / 2
- the DSAS line is a circuit that precharges DSAS to VPC when RE or IN is inactive, and drives it to VSS when activated.
- the DSAS line driver By arranging the DSAS line driver in the cross area in this way, the DSAS line can be activated in units of mats, so that the direct sense amplifier can be activated only in the selected mats, thereby reducing power consumption.
- the DSAS line driver is intensively arranged in the array control circuit ACC part in Fig. 2
- the difference between the far and near ends of the potential on the DSAS line is reduced due to the effect of the distributed arrangement of the driver, and the There is an advantage that variation in the sensing speed depending on the location of the sense amplifier can be reduced.
- the WLIO line precharge circuit precharges the WLIO line to VDL / 2 when the write enable signal WE is at the inactive VSS level.
- the write gate is a circuit that connects the WLIO line to the main 10-line MIO / MIOB when WE is at the active VCL level. This circuit can output the VCL level and VSS level without decreasing the amplitude when switching from the MIO line to the WLIO line by using a CMOS configuration.
- the CS line driver is a circuit that drives the P-side common source line CSP to VDL (bit line H level) and the N-side common source line CSN to VSS when the sense amplifier enable signal SE is active. is there.
- the CS line precharge circuit SPC is a circuit that precharges CSP and CSN to VDL / 2 when the precharge signal PC is activated.
- Precharge signal PC signal complement to PC signal driver PCB is input and PC is output.
- the FX line driver receives the FXB complementary signal FXB and outputs FX.
- FIG. 6 shows the main amplifier circuit MA.
- the main amplifier consists of the MIO precharge circuit IPC, load circuit LD, transfer gate TGC, MA precharge circuit APC, latch circuit LTC, GIO buffer GB, and write buffer WB.
- the MIO precharge circuit precharges the MIO line to VPC when the MIO precharge signal IP is activated.
- the load circuit functions as a load on the MIO line when the transfer gate control signal TG is activated and its complementary signal TGB becomes VSS.
- the transfer gate conducts when the TG is activated, and connects the MIO to the latch circuit.
- the main amplifier precharge circuit precharges the inside of the main amplifier to the VPC when the main amplifier precharge signal AP is activated.
- the latch circuit is a circuit that amplifies and holds the small-amplitude signal input from the MIO to the full amplitude (VCL, that is, the power supply potential or VSS) when the latch signal LT is activated.
- VCL full amplitude
- the GIO buffer is a circuit that outputs the data held by the latch circuit to the read port 10-line GIOR when the GIO buffer enable signal GBE is activated.
- the write buffer WB is a circuit that outputs data on the write global 10-line GIOW to the MIO / MIOB when the write buffer enable signal WBE is activated.
- FIG. 7 a block diagram is shown focusing on two memory arrays ARY0,1 and three sense amplifier arrays SAA0-2, which are part of Figure 1.
- the force RYS that connects the read column select line RYS to one direct sense amplifier DSA in all sense amplifier rows may be connected to multiple direct sense amplifiers. In this case, it is necessary to increase the number of read LIOs.
- two pairs of MIO0 / MIOB0 and MI01 / MIOB1 are alternately connected to the read gate circuit in the cross area.
- the read operation is shown using the operation waveform of FIG.
- the sense amplifier separation signal SHR and the precharge signal PC are deactivated in the sense amplifier array SAA0,1 specified by the address.
- the read enable signal RE is activated, and the direct sense amplifier common source lines DSAS0 and DSAS1 are driven to VSS.
- the direct sense amplifier is activated in the sense amplifier arrays SAA0 and SAA1.
- the through current does not flow because RLI02 / RLIOB2 and DSAS2 have the same potential at VPC.
- the absolute value of the potential difference between RLIO / RIOB connected to the selected sense amplifier row and the common source line DSAS is calculated using the absolute value of the potential difference between RLIO / RIOB connected to the unselected sense amplifier row and the common source line DSAS. It is possible to make it larger than the absolute value and to prevent the through current from decreasing. In this way, the current flowing between the source and drain of the transistor connecting the unselected sense amplifier and the bit line is changed between the source and drain of the transistor connecting the selected sense amplifier and the bit line. The same effect can be obtained by making the current smaller than the flowing current.
- the selected word line WL0 is activated to VPP.
- the cell transistor is turned on, and a signal is read out on the bit line BL.
- the direct sense amplifier drives RLIO / RLIOB, and a voltage difference appears between RLIO / RLIOB.
- This signal is transmitted to the MIO / MIOB because the read gate is conductive in the cross area by RE. Further, in this embodiment, the read line WL is activated after RYS0 is activated and DSAS0,1 is driven to VSS. However, it is also possible to start WL before driving RYS0 and DSAS0,1. . As a result, the operation margin can be reduced as compared with a normal sense amplifier.
- a rewrite operation is performed in the memory array.
- the restorer amplifier CC in the sense amplifier amplifies the bit line to VDL or VSS. I do.
- the lead line is deactivated to VSS.
- PC and SHR are activated, the bit line and common source line are precharged, and the read cycle ends.
- a direct sense amplifier data read and memory array rewrite operation can be performed in parallel, so that the direct sense amplifier is activated earlier than the word line is activated and the data is read. While the read speed is high, the restore amplifier can be activated after the read line is activated and the signal from the memory cell is sufficiently generated on the bit line, and the rewrite operation can be performed with high reliability.
- a block diagram is shown focusing on two memory arrays ARY0,1 and three sense amplifier arrays SAA0-2, which are part of Fig. 1.
- the write column select line WYS is connected to one write circuit WP in all sense amplifier rows, but WYS may be connected to a plurality of write circuits. In this case, it is necessary to increase the number of write LIO pairs. Two pairs of MIO0 / MIOB0 and MI01 / MIOB1 are alternately connected to the write gate circuit in the cross area.
- the data on MIO0 MIOB0 and MIO1 / MIOB1 are written to the write circuits in the sense amplifier arrays SAA0 and SAA1 via WLIO0 / WLIOB0 and WLIO1 / WLIOB1, respectively. Are written to the data lines and memory cells of the memory array.
- write operation is shown using the operation waveforms in FIG.
- a write command WT is input from outside the chip
- write data is fetched from DQ and output to the write global 10-line GIOW.
- the MIO precharge signal IP is deactivated and the write-back enable WBE is activated, write data is output to the MIO line.
- the selected read line WL0 is activated to VPP.
- the cell transistor conducts, and data is written from the bit line to the memory cell.
- the restorer amplifier CC in the sense amplifier amplifies the bit line to VDL or VSS.
- FIG. 13 shows the second sense amplifier SA circuit.
- this sense amplifier one set of direct sense amplifier DSA and write circuit WP are shared by two SAs.
- a selection means such as a multiplexer MUX is added, and the ability to select S0 or SI is used to select which of the two SAs is connected to RLIO / RLIOB or WLIO / WLIOB.
- the transfer gate TGC, precharge circuit PCC, restore amplifier CC, write circuit WP, and direct sense amplifier DSA circuits and their operations are the same as those shown in Fig. 1.
- this sense amplifier in addition to the same effect as the sense amplifier of Fig.
- the direct sense amplifier DSA can be arranged in the area of two sense amplifiers, so the size of the MOS transistor in the direct sense amplifier DSA is reduced. It is possible to increase the amount of signals read to RLIO / RLIOB and MIO / MIOB. In this way, adding a multiplexer in the sense amplifier increases the load capacity of the bit line, thereby reducing the signal amount of the bit line.
- the present invention uses twin cells as shown in the figure, the signal amount of the bit line is about twice as large as that of using a normal DRAM cell, and a multiplexer was added. Therefore, there is an advantage that the influence of the decrease in the bit line signal amount due to is small.
- FIG. 14 shows the third sense amplifier SA circuit.
- the select line YS is shared between read and write.
- a MOS transistor controlled by the write enable signal WE is connected in series with the MOS transistor controlled by the column selection line in the write circuit WP. Since WE is deactivated during a read operation, the sense amplifier and WLIO / WLIOB are not connected even if the column select line YS is activated.
- the circuit and operation of the transfer gate TGC, precharge circuit PCC, restore amplifier CC, and direct sense amplifier DSA are the same as those shown in Fig. 1.
- This sense amplifier has the same effect as the sense amplifier in Fig. 1 and the number of column select lines can be halved compared to the sense amplifier in Fig. 1, so the wiring pitch can be expanded to simplify the process, and the power supply wiring By increasing the number, the speed of the sense amplifier operation can be increased.
- FIG. 15 shows a fourth sense amplifier SA circuit.
- this sense amplifier the connection point N0 between the MOS transistors MN2 and MN3 controlled by the column selection line YS in the direct sense amplifier DSA and the MOS transistors MN0 and MN1 in which the bit line is connected to the gate in the sense amplifier of FIG. , N1 and an equalizing MOS transistor MN4.
- This MOS transistor conducts when the precharge signal PC is activated, and shorts N0 and N1.
- FIG. 16 shows the operation waveforms of the sense amplifier of FIG. 14 without MN4. Focusing on the sense amplifier where YS is not selected during read operation, N0 and N1 are VSS when DSAS is driven by VSS.
- the sense amplifier without MN9 shown in Fig. 14 if WE is returned to VSS while bit lines BL and BLB are amplified to VDL and VSS during write operation, N2 and N3 are left as VDL and VSS. It is.
- FIG. 15 shows a case where the column selection line connected to the direct sense amplifier DSA and the column selection line connected to the write circuit WP are common, the same effect can be obtained even if they are separated. is there. Even in such a case, MN5 and MN6 are required to perform the write mask operation to stop the write in some of the sense amplifiers selected by WYS and DSAS during the write operation. It is effective to provide MN9 to solve the above problems.
- FIG. 17 shows a second main circuit MA.
- This main amplifier consists of MIO precharge circuit IPC, load circuit LD, MA precharge circuit APC, latch circuit LTC, GIO buffer GB, and write buffer WB.
- the MIO precharge circuit precharges the MIO line to VPC when the MIO precharge signal IP is activated.
- the load circuit functions as a load on the MIO line when the RE enable RE is activated and the REB force becomes VSS.
- the main amplifier precharge circuit precharges the output node of the latch to VCL (power supply potential) when the complementary main amplifier precharge signal APB becomes VSS.
- the latch circuit is a circuit that amplifies and holds a small amplitude signal input from MIO to full amplitude (VCL or VSS) when the latch signal LT is activated.
- the latch circuit of this main amplifier uses a gate input amplifier and a cross couple. Therefore, there is the advantage that the input capacitance seen from the MIO line is small, the input signal of the main amplifier can be large, and the operation speed is fast.
- the MIO level If the voltage drops too low, the conductance of the MOS transistor input to the gate of the MIO will decrease and the operating speed will slow down. Therefore, the first main amplifier in Fig. 6 is advantageous in terms of operating margin.
- the configuration of the GIO buffer and write buffer WB is the same as that of the main amplifier in Fig. 6.
- Figure 18 shows the third main amplifier circuit MA.
- this main amplifier only the positions of the load circuit LD and the transfer gate TGC are replaced in the first main amplifier circuit in Fig. 6, and the other circuits are exactly the same.
- a load circuit is provided inside the transfer gate of the N-type MOS transistor with respect to the main circuit 10, they function as a gate-grounded amplifier. Therefore, the signal difference at MIO0 / MIOB0 is amplified and transmitted to the inputs LN and LNB of the latch. Therefore, the input signal of the latch circuit is increased, and there is an advantage that the operation speed of the latch is improved and the operation margin is expanded.
- FIG. 19 shows the fourth main amplifier circuit MA.
- This main amplifier combines the gate grounded amplifier GA in the third main amplifier circuit in FIG. 18 with the latch circuit LTC in FIG.
- a source follower circuit SF is provided between LTC and GA to perform impedance conversion.
- This circuit has the advantage that the input signal can be pre-amplified by the grounded gate amplifier, and the input capacitance of the latch-type amplifier is small, so that the signal amount can be large and high-speed operation with a wide margin is possible. . Further, by providing the source follower circuit, it is possible to reduce coupling noise applied to the input terminal from the differential MOS transistor of the latch amplifier when the latch amplifier is activated.
- the output node of the latch amplifier can be precharged to VCL. Therefore, since the NMOS gut in the GIO buffer is turned off by VSS, if GBE is input and the GIO buffer is activated before LT is input and the latch determines the data, the latch timing Since the GIO buffer can be driven only by itself, high speed access is possible.
- FIG. 20 shows the second local 10 connection method of the present invention.
- sense amplifiers are divided into groups a and b at the center of one sense amplifier array SAA.
- group a the write circuit WP is connected to one local 10-wire pair LIO0 / LIO0B, and the direct sense amplifier DSA is connected to the other local 10-wire pair LI01 / LIOB1.
- group b the write circuit WP is connected to the local 10-wire pair LI01 / LI01B, and the direct sense amplifier DSA is connected to the other local 10-wire pair LI01 / LIOB1.
- FIG. 21 shows a second data path configuration of the present invention.
- the offset compensation sub-amplifier is placed at the connection between the local 10 line and the main 10 line, so that the direct sense amplifier does not have offset compensation and the offset of the direct sense amplifier is compensated. can do.
- the memory array ARY and the sense amplifier SA are the same as those shown in FIG. 1, but only some of them are shown.
- the difference of the present invention is that a sub-amplifier BA is provided in the cross area XP. Other circuits in the cross area are the same as in FIG. 5, and are omitted in FIG.
- the precharge signal PC is deactivated to VSS.
- the re-enable signal RE is activated to VCL, REB is activated to VSS, and the sub-amplifier BA is activated.
- DSAS is driven from VPC to VSS, and direct sense amplifier DSA is activated.
- the bit line that is the input of the DSA is still precharged to VDL / 2, so select the column for reading.
- the line RYS is activated, a signal corresponding to the offset of the direct sense amplifier is generated on the local read 10 line RLIO / RLIOB.
- the compensation signal CP is VCL, and the input terminals GT and GB of the sub-amplifier connected with LIO and the decoupling capacitor are short-circuited to the output terminal and fixed at the offset compensation potential.
- the offset of the sub-amplifier itself is compensated at this point.
- CP is deactivated to VSS, and the sub-amplifier is set in an amplifiable state.
- the word line WL is activated to generate a signal from the memory cell between the bit lines BL / BLB.
- the direct sense amplifier amplifies this and outputs a signal to RLIO and RLIOB.At this time, since a signal is generated to GT and GB via a decoupling capacitor, the offset compensation potential is set to RLIO and RLIOB. A voltage to which a change is added is generated. Therefore, since a signal is generated based on the potential difference between RLIO and RLIOB at the moment when CP is dropped to VSS, a net RLIO signal without the offset of the direct sense amplifier is obtained. Therefore, the offset of the direct sense amplifier is compensated.
- the sub amplifier amplifies the potential difference between GT and GB and outputs it to MIO and MIOB.
- the present invention described above can be used in a high-speed random access memory such as a DRAM or an SRAM, and particularly in a memory for transmitting a signal read from a memory cell to a bit line to a peripheral circuit at a high speed by a gate input amplifier.
- the present invention can be used in non-volatile memories such as FLASH, FERAM, and MRAM in order to speed up reading.
- non-volatile memories such as FLASH, FERAM, and MRAM in order to speed up reading.
- on-chip memories built in logic chips such as microprocessors and DSPs, the access time must be shortened with an increase in clock frequency. It is effective to apply
- the present invention is not limited to the above-described embodiment, and may be variously modified without departing from the gist thereof. Needless to say.
- the main effects obtained by the present invention are as follows.
- the direct sense amplifier can be selectively used in random access memory. Since activation is possible, power consumption during a read operation can be significantly reduced. In addition, since the load capacity of the local 10 lines can be reduced at that time, the reading speed can be increased. In addition, the dependence of the load capacitance of the local 10 lines on the data pattern in the read operation is reduced, and testing after manufacturing becomes easier.
- the present invention can be used in a high-speed random access memory such as a DRAM or an SRAM, and particularly in a memory in which a signal read from a memory cell to a bit line is transmitted to peripheral circuits at high speed by a good input amplifier. Also, the present invention can be used in non-volatile memories such as FLASH, FERAM, and MRAM in order to speed up reading. It is also applicable to on-chip memories built into logic chips such as microprocessors and DSPs, as well as single memory chips.
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Abstract
Description
Claims
Priority Applications (6)
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JP2004549569A JPWO2004042821A1 (ja) | 2002-11-08 | 2002-11-08 | 半導体記憶装置 |
CNB028298373A CN100354971C (zh) | 2002-11-08 | 2002-11-08 | 半导体存储装置 |
US10/534,049 US7200061B2 (en) | 2002-11-08 | 2002-11-08 | Sense amplifier for semiconductor memory device |
PCT/JP2002/011659 WO2004042821A1 (ja) | 2002-11-08 | 2002-11-08 | 半導体記憶装置 |
US11/706,409 US7447091B2 (en) | 2002-11-08 | 2007-02-15 | Sense amplifier for semiconductor memory device |
US12/285,527 US7969765B2 (en) | 2002-11-08 | 2008-10-08 | Sense amplifier for semiconductor memory device |
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PCT/JP2002/011659 WO2004042821A1 (ja) | 2002-11-08 | 2002-11-08 | 半導体記憶装置 |
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US10534049 A-371-Of-International | 2002-11-08 | ||
US11/706,409 Continuation US7447091B2 (en) | 2002-11-08 | 2007-02-15 | Sense amplifier for semiconductor memory device |
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WO2004042821A1 true WO2004042821A1 (ja) | 2004-05-21 |
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JP (1) | JPWO2004042821A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
US20090059702A1 (en) | 2009-03-05 |
JPWO2004042821A1 (ja) | 2006-03-09 |
US7969765B2 (en) | 2011-06-28 |
US20060034133A1 (en) | 2006-02-16 |
CN100354971C (zh) | 2007-12-12 |
US7447091B2 (en) | 2008-11-04 |
CN1695249A (zh) | 2005-11-09 |
US7200061B2 (en) | 2007-04-03 |
US20070147152A1 (en) | 2007-06-28 |
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