WO2006066890A1 - Bipolar reading technique for a memory cell having an electrically floating body transistor - Google Patents
Bipolar reading technique for a memory cell having an electrically floating body transistor Download PDFInfo
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- WO2006066890A1 WO2006066890A1 PCT/EP2005/013755 EP2005013755W WO2006066890A1 WO 2006066890 A1 WO2006066890 A1 WO 2006066890A1 EP 2005013755 W EP2005013755 W EP 2005013755W WO 2006066890 A1 WO2006066890 A1 WO 2006066890A1
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- transistor
- memory cell
- electrically floating
- floating body
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- 210000000746 body region Anatomy 0.000 claims description 45
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- 238000009826 distribution Methods 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
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- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- 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
- G11C11/403—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 with charge regeneration common to a multiplicity of memory cells, i.e. external refresh
- G11C11/404—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 with charge regeneration common to a multiplicity of memory cells, i.e. external refresh with one charge-transfer gate, e.g. MOS transistor, per cell
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- 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
- G11C11/4076—Timing circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7841—Field effect transistors with field effect produced by an insulated gate with floating body, e.g. programmable transistors
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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
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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
- H10B12/10—DRAM devices comprising bipolar components
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C2211/00—Indexing scheme relating to digital stores characterized by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C2211/401—Indexing scheme relating to cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C2211/4016—Memory devices with silicon-on-insulator cells
Definitions
- This invention relates to a semiconductor memory cell, array, architecture and device, and techniques for controlling and/or operating such cell and device; and more particularly, in one aspect, to a semiconductor dynamic random access memory (“DRAM”) cell, array, architecture and/or device wherein the memory cell includes an electrically floating body in which an electrical charge is stored.
- DRAM semiconductor dynamic random access memory
- SOI Silicon-on-lnsulator
- PD partially depleted
- FD fully depleted
- Fin-FET Fin-FET
- the memory cell may consist of a PD or a FD SOI transistor (or transistor formed in bulk material/substrate) on having a channel, which is disposed adjacent to the body and separated therefrom by a gate dielectric.
- the body region of the transistor is electrically floating in view of the insulation or non- conductive region (for example, in bulk-type material/substrate) disposed beneath the body region.
- the state of memory cell is determined by the concentration of charge within the body region of the SOI transistor.
- semiconductor DRAM array 10 includes a plurality of memory cells 12 each consisting of transistor 14 having gate 16, body region 18, which is electrically floating, source region 20 and drain region 22.
- the body region 18 is disposed between source region 20 and drain region 22.
- body region 18 is disposed on or above region 24, which may be an insulation region (for example, in SOI material/substrate) or non-conductive region (for example, in bulk-type material/substrate).
- the insulation or non-conductive region may be disposed on substrate 26.
- Data is written into or read from a selected memory cell by applying suitable control signals to a selected word line(s) 28, a selected source line(s) 30 and/or a selected bit line(s) 32.
- charge carriers are accumulated in or emitted and/or ejected from electrically floating body region 18 wherein the data states are defined by the amount of carriers within electrically floating body region 18.
- the entire contents of the Semiconductor Memory Device Patent Application including, for example, the features, attributes, architectures, configurations, materials, techniques and advantages described and illustrated therein, are incorporated by reference herein.
- memory cell 12 of DRAM array 10 operates by accumulating in or emitting/ejecting majority carriers (electrons or holes) 34 from body region 18 of, for example, N-channel transistors.
- accumulating majority carriers (in this example, "holes") 34 in body region 18 of memory cells 12 via, for example, impact ionization near source region 20 and/or drain region 22, is representative of a logic high or "1" data state.
- Emitting or ejecting majority carriers 30 from body region 18 via, for example, forward biasing the source/body junction and/or the drain/body junction is representative of a logic low or "0" data state. (See, FIGURE 2B).
- a logic high or State “1” corresponds to an increased concentration of majority carries in the body region relative to an unprogrammed device and/or a device that is programmed with a logic low or State "0".
- a logic low or State “0” corresponds to a reduced concentration of majority carries in the body region relative to an unprogrammed device and/or a device that is programmed with a logic high or State "1".
- a floating body memory device has two different current states corresponding to two different logical states: "1" and "0". Reading is performed by comparison of a cell current with the current from a reference cell that is usually placed between the state “1 " and state "0". Large enough statistical variations in the device currents may cause an erroneous reading as it is shown in FIGURE 3.
- Small programming window reduces the speed or access time of the memory device, memory array, and/or memory cells. As such, there is a need for high performance reading techniques for floating body memory cells, devices and arrays providing better reading speed and robustness to technology fluctuations.
- the present inventions are directed to an integrated circuit device comprising a memory cell including an electrically floating body transistor, wherein the electrically floating body transistor includes a source region, a drain region, an electrically floating body region disposed between the source region and the drain region, and a gate disposed over the body region.
- Each memory cell includes at least (i) a first data state which is representative of a first charge in the body region of the transistor, and (ii) a second data state which is representative of a second charge in the body region of the transistor.
- the integrated circuit device further comprises data sensing circuitry, coupled to the memory cell, to sense the data state of the memory cell, wherein, in response to read control signals applied to the electrically floating body transistor, the electrically floating body transistor generates a bipolar transistor current which is representative of the data state of the memory cell and wherein the data sensing circuitry determines the data state of the memory cell substantially based on the bipolar transistor current.
- the electrically floating body transistor may be an N-channel type transistor or a P-channel type transistor.
- the read control signals may include a signal applied to the gate, source region, and drain region to cause, force and/or induce the bipolar transistor current which is representative of the data state of the memory cell.
- the read control signals include a positive voltage pulse which is applied to the drain region of the electrically floating body transistor.
- the read control signals include a negative voltage pulse which is applied to the drain region of the electrically floating body transistor.
- an integrated circuit device comprising a memory cell including an electrically floating body transistor which consists essentially of a source region and drain, each having impurities to provide a first conductivity type, a body region disposed between the source region and the drain region wherein the body region is electrically floating and includes impurities to provide a second conductivity type wherein the second conductivity type is different from the first conductivity type, and a gate disposed over the body region.
- Each memory cell includes at least (i) a first data state which is representative of a first charge in the body region of the transistor, and (ii) a second data state which is representative of a second charge in the body region of the transistor.
- the integrated circuit device further comprises (i) data sensing circuitry, coupled to the memory cell, to sense the data state of the memory cell, and (ii) control circuitry, coupled to the memory cell, to generate and apply read control signals to the electrically floating body transistor.
- data sensing circuitry coupled to the memory cell, to sense the data state of the memory cell
- control circuitry coupled to the memory cell, to generate and apply read control signals to the electrically floating body transistor.
- the electrically floating body transistor In response to read control signals applied to the electrically floating body transistor, the electrically floating body transistor generates a bipolar transistor current which is representative of the data state of the memory cell and wherein the data sensing circuitry determines the data state of the memory cell substantially based on the bipolar transistor current.
- the electrically floating body transistor of this aspect of the invention may be an N-channel type transistor or a P-channel type transistor.
- the read control signals may include a signal applied to the gate, source region, and drain region to cause, force and/or induce the bipolar transistor current which is representative of the data state of the memory cell.
- the read control signals include a positive voltage pulse which is applied to the drain region of the electrically floating body transistor.
- the read control signals include a negative voltage pulse which is applied to the drain region of the electrically floating body transistor.
- an integrated circuit device comprising a memory cell including an electrically floating body transistor, wherein the electrically floating body transistor disposed in or on a semiconductor region or layer which resides on or above an insulating region or layer of a substrate.
- the electrically floating body transistor includes a source region and drain, each having impurities to provide a first conductivity type, a body region disposed between the source region and the drain region wherein the body region is electrically floating and includes impurities to provide a second conductivity type wherein the second conductivity type is different from the first conductivity type, and a gate disposed over the body region.
- Each memory cell includes at least (i) a first data state which is representative of a first charge in the body region of the transistor, and (ii) a second data state which is representative of a second charge in the body region of the transistor.
- the integrated circuit device further comprises (i) data sensing circuitry, coupled to the memory cell, to sense the data state of the memory cell, and (ii) control circuitry, coupled to the memory cell, to generate and apply read control signals to the electrically floating body transistor.
- the electrically floating body transistor In response to read control signals applied to the electrically floating body transistor, the electrically floating body transistor generates a bipolar transistor current which is representative of the data state of the memory cell and wherein the data sensing circuitry determines the data state of the memory cell substantially based on the bipolar transistor current.
- the electrically floating body transistor of this aspect of the invention may be an N-channel type transistor or a P-channel type transistor.
- the read control signals may include a signal applied to the gate, source region, and drain region to cause, force and/or induce the bipolar transistor current which is representative of the data state of the memory cell.
- the read control signals include a positive voltage pulse which is applied to the drain region of the electrically floating body transistor.
- the read control signals include a negative voltage pulse which is applied to the drain region of the electrically floating body transistor.
- FIGURE 1A is a schematic representation of a prior art semiconductor DRAM array including a plurality of memory cells comprised of one electrically floating body transistor;
- FIGURE 1 B is a three dimensional view of an exemplary prior art memory cell comprised of one electrically floating body transistor (PD-SOI NMOS);
- PD-SOI NMOS electrically floating body transistor
- FIGURE 1 C is a cross-sectional view of the prior art memory cell of FIGURE 1 B, cross-sectioned along line C-C;
- FIGURES 2A and 2B are exemplary schematic illustrations of the charge relationship, for a given data state, of the floating body, source and drain regions of a prior art memory cell comprised of one electrically floating body transistor (PD-SOI NMOS);
- PD-SOI NMOS electrically floating body transistor
- FIGURE 3 illustrates statistical variations in the currents read from an electrically floating body transistor
- FIGURE 4A is a schematic representation of an equivalent electrically floating body memory cell (N-channel type) including an intrinsic bipolar transistor in addition to the MOS transistor;
- FIGURE 4B is a schematic representation of an equivalent electrically floating body memory cell (P-channel type) including an intrinsic bipolar transistor in addition to the MOS transistor;
- FIGURES 5A and 5B illustrate the statistical distributions for conventional reading technique versus bipolar reading
- FIGURE 6 is an exemplary graphical illustration of selected control signals for writing State "1" and State “O” into a memory cell (having an electrically floating body transistor) wherein the memory cell state is read in accordance with the technique of the present invention
- FIGURES 7A and 7B are schematic block diagrams of embodiments of an integrated circuit device including, among other things, a memory cell array, data sense and write circuitry, memory cell selection and control circuitry, according certain aspects of the present inventions.
- DETAILED DESCRIPTION DETAILED DESCRIPTION
- the present inventions are directed to a memory cell, having an electrically floating body transistor, and/or a technique of reading the data state in such a memory cell.
- the present inventions employ the intrinsic bipolar transistor current to read and/or determine the data state of the electrically floating body memory cell (for example, whether the electrically floating body memory cell is programmed in a State "0" and State "1").
- the data state is determined primarily by, sensed substantially using and/or based substantially on the bipolar transistor current that is responsive to the read control signals and significantly less by the interface channel current component, which is negligible relatively to the bipolar component.
- the bipolar transistor current may be very sensitive to the floating body potential due to the high gain of the intrinsic bipolar transistor.
- the programming window obtainable with the bipolar reading technique may be considerably higher (for example, up two orders of magnitude higher) than the programming window employing a conventional reading technique (which is based primarily on the interface channel current component.
- the large programming window provides other opportunities/advantages, for example, simulations demonstrate that the bipolar reading may be accomplished significantly faster than conventional techniques (for example, in less than in 1 ns).
- the present invention includes memory cell 12 having electrically floating body transistor 14.
- electrically floating body transistor 14 is an N-channel type transistor; as such, majority carriers are "holes".
- the N-channel type transistor 14 equivalently includes an electrically floating body MOS transistor and an intrinsic bipolar transistor.
- a N-type MOSFET includes an N + source, the P- type body and the N + drain wherein the N + source, the P-type body and the N + drain intrinsically form the emitter, the base, and the collector, respectively of an NPN bipolar transistor.
- the present inventions are fully applicable to a memory cell comprising a P-channel type electrically floating body transistor (here, the majority carriers are "electrons").
- the P-channel type transistor also equivalent ⁇ includes an electrically floating body MOS transistor and an intrinsic bipolar transistor.
- a P-type MOSFET includes an P + source, the N- type body and the P + drain wherein the P + source, the N-type body and the P + drain intrinsically form the emitter, the base, and the collector, respectively of an PNP bipolar transistor.
- suitable and predetermined control signals may be applied to gate 16, source region 20, and drain region 22 in order to cause, force and/or induce the bipolar transistor current in transistor 14 of memory cell 12.
- 0 volts may be applied to source region 20 and gate 16 and a positive voltage (for example, +3.5 volts) may be applied to drain region 22.
- Such control signals in combination, induce and/or cause a bipolar transistor current which is considerably larger than any channel current.
- sensing circuitry for example, a cross-coupled sense amplifier
- transistor 14 for example, drain region 22
- electrically floating body transistor 14 in response to read control signals, electrically floating body transistor 14 generates a bipolar transistor current which is representative of the data state of memory cell 12. Where the data state is a logic high or State "1", electrically floating body transistor 14 provides a substantially greater bipolar transistor current than where the data state is a logic low or State "0". Indeed, electrically floating body transistor 14 may provide little to no bipolar transistor current when the data state is a logic low or State "0". As discussed in more detail below, data sensing circuitry determines the data state of the memory cell substantially based on the bipolar transistor current.
- electrically floating body transistor 14 is an P-channel type transistor, in operation, during the read operation, in one embodiment, 0 volts may be applied to source region 20 and gate 16 and a negative voltage (for example, -4 volts) may be applied to drain region 22. Such control signals, in combination, induce and/or cause a bipolar transistor current which is considerably larger than any channel current. Moreover, electrically floating body transistor 14 generates a bipolar transistor current which is representative of the data state of the memory cell. In this embodiment, where the data state is logic high or State "1 ", electrically floating body transistor 14 provides a substantially greater bipolar transistor current-than where the data state is a logic low or State "0".
- electrically floating body transistor 14 may provide little to no bipolar transistor current when the data state is a logic low or State "0".
- the sensing circuitry (for example, a cross-coupled sense amplifier), which is coupled to transistor 14 (for example, drain region 22) of memory cell 12, senses the data state using primarily and/or based substantially on the bipolar transistor current.
- the exemplary voltage amplitudes to implement the read operation are merely exemplary.
- the indicated voltage levels may be relative or absolute.
- the voltages indicated may be relative in that each voltage level, for example, may be increased or decreased by a given voltage amount (for example, each voltage may be increased or decreased by 0.25, 0.5, 1.0 and 2.0 volts) whether one or more of the voltages (for example, the source, drain or gate voltages) become or are positive and negative.
- FIGURE 6 is an exemplary graphical illustration of selected control signals, having exemplary values/characteristics, for reading State "1" and State "0" in memory cell 12 of FIGURE 4A.
- the present inventions may be implemented an integrated circuit device (for example, a discrete memory device or a device having embedded - memory) having a memory array including a plurality of memory cells each including an electrically floating body transistor.
- the memory arrays may be comprised of N- channel, P-channel and/or both types of transistors.
- circuitry that is peripheral to the memory array for example, data sense circuitry (for example, sense amplifiers or comparators), memory cell selection and control circuitry (for example, word line and/or source line drivers), as well as row and column address decoders) may include P-channel and/or N-channel type transistors.
- the integrated circuit device includes array 10, having a plurality of memory cells 12, data write and sense circuitry 34, and memory cell selection and control circuitry 36.
- the data write and sense circuitry 34 writes data into and senses the data state of one or more memory cells 12.
- the memory cell selection and control circuitry 36 selects and/or enables one or more predetermined memory cells 12 to be read by data sense circuitry 34.
- the memory array 10 may be implemented using any number of architectures, layouts, and/or configurations employing electrically floating body memory cells 12.
- an electrically floating body transistor which state is read using the techniques of the present invention, may be implemented in the memory cell, architecture, layout, structure and/or configuration described and illustrated in the following non-provisional and provisional U.S. patent applications:
- the present invention may also employ the read circuitry and techniques described and illustrated in U.S. Patent Application Serial No. 10/840,902, which was filed by Portmann et al. on May 7, 2004, and entitled "Reference Current Generator, and Method of Programming, Adjusting and/or Operating Same".
- the data write and sense circuitry 34 may include a sense amplifier (see, FIGURE 7B) to read the data stored in memory cells 12.
- the sense amplifier (for example, a cross-coupled sense amplifier as described and illustrated in the Non-Provisional U.S. Patent Application filed by Waller and Carman, on December 12, 2005 and entitled "Sense Amplifier Circuitry and Architecture to Write Data into and/or Read from Memory Cells", the application being incorporated herein by reference in its entirety) may sense the data state stored in memory cell 12 using voltage or current sensing circuitry and/or techniques.
- the current sense amplifier may compare the cell current to a reference current, for example, the current of a reference cell (see, generally, FIGURE 7B).
- memory cell 12 may be determined whether memory cell 12 contained a logic high (relatively more majority carries 34 contained within body region 18) or logic low data state (relatively less majority carries 28 contained within body region 18).
- logic high relatively more majority carries 34 contained within body region 18
- logic low data state relatively less majority carries 28 contained within body region 18.
- the present invention may employ the reference generation techniques (used in conjunction with the data sense circuitry for the read operation) described and illustrated in U.S. Provisional Patent Application Serial No. 60/718,417, which was filed by Bauser on September 19, 2005, and entitled "Method and Circuitry to Generate a Reference Current for Reading a Memory Cell Having an Electrically Floating Body Transistor, and Device Implementing Same".
- the entire contents of the U.S. Provisional Patent Application Serial No. 60/718,417 are incorporated herein by reference.
- each memory cell 12 in the exemplary embodiments includes one transistor 14, memory cell 12 may include two transistors, as described and illustrated in Application Ser. No. 10/829,877, which was filed by Ferrant et al. on April 22, 2004 and entitled "Semiconductor Memory Cell, Array, Architecture and Device, and Method of Operating Same".
- the electrically floating memory cells, transistors and/or memory array(s) may be fabricated using well known techniques and/or materials. Indeed, any fabrication technique and/or material, whether now known or later developed, may be employed to fabricate the electrically floating memory cells, transistors and/or memory array(s). For example, the present invention may employ silicon (whether bulk-type or SOI), germanium, silicon/germanium, gallium arsenide or any other semiconductor material in which transistors may be formed. Indeed, the electrically floating transistors, memory cells, and/or memory array(s) may employ the techniques described and illustrated in non-provisional patent application entitled "Integrated Circuit Device, and Method of Fabricating Same", which was filed on July 2, 2004, by Fazan, Serial No.
- memory array 10 may be integrated with SOI logic transistors, as described and illustrated in the Integrated Circuit Device Patent Applications.
- an integrated circuit device includes memory section (having, for example, PD or FD SOI memory transistors 14) and logic section (having, for example, high performance transistors, such as FinFET, multiple gate transistors, and/or non-high performance transistors (for example, single gate - transistors that do not possess the performance characteristics of high performance transistors - not illustrated)).
- memory section having, for example, PD or FD SOI memory transistors 14
- logic section having, for example, high performance transistors, such as FinFET, multiple gate transistors, and/or non-high performance transistors (for example, single gate - transistors that do not possess the performance characteristics of high performance transistors - not illustrated)).
- the memory arrays may be comprised of N-channel, P-channel and/or both types of transistors, as well as partially depleted and/or fully depleted type transistors.
- circuitry that is peripheral to the memory array may include fully depleted type transistors (whether P-channel and/or N-channel type).
- circuitry may include partially depleted type transistors (whether P-channel and/or N-channel type).
- electrically floating body transistor 14 may be a symmetrical or nonsymmetrical device. Where transistor 14 is symmetrical, the source and drain regions are essentially interchangeable. However, where transistor 14 is a nonsymmetrical device, the source or drain regions of transistor 14 have different electrical, physical, doping concentration and/or doping profile characteristics. As such, the source or drain regions of a non-symmetrical device are typically not interchangeable. This notwithstanding, the drain region of the electrically floating N- channel transistor of the memory cell (whether the source and drain regions are interchangeable or not) is that region of the transistor that is connected to the bit line/sense amplifier.
- the memory arrays may be comprised of N-channel, P- channel and/or both types of transistors.
- circuitry that is peripheral to the memory array for example, sense amplifiers or comparators, row and column address decoders, as well as line drivers (not illustrated herein) may include P- channel and/or N-channel type transistors.
- P-channel type transistors are employed as memory cells 12 in the memory array(s)
- suitable write and read voltages for example, negative voltages
- the illustrated/exemplary voltage levels to implement the read and write operations are merely exemplary.
- the indicated voltage levels may be relative or absolute.
- the voltages indicated may be relative in that each voltage level, for example, may be increased or decreased by a given voltage amount (for example, each voltage may be increased or decreased by 0.1 , 0.15, 0.25, 0.5, 1 volt) whether one or more of the voltages (for example, the source, drain or gate voltages) become or are positive and negative.
- the present inventions may employ the circuitry and techniques for independently controlling certain parameters (for example, temporal or voltage), for a memory operation (for example, restore, write, refresh), to program or write a predetermined data state into a memory cell (for example, programming or writing data state "1" or "0" into a memory cell) as described and illustrated in U.S. Provisional Patent Application Serial No. 60/731 ,668, which was filed by Popoff on October 31 , 2005, and entitled "Method and Apparatus for Varying the Programming Duration of a Floating Body Transistor, and Memory Cell, Array, and/or Device Implementing Same".
- certain parameters for example, temporal or voltage
- a memory operation for example, restore, write, refresh
- program or write a predetermined data state into a memory cell for example, programming or writing data state "1" or "0" into a memory cell
- the duration of programming/writing of a given memory state into a memory cell by the data sense amplifier circuitry may be controlled adjusted, determined and/or predetermined according to or based on the given memory operation (for example, restore, write, refresh).
- the voltage conditions applied to the memory cell for programming/writing a given memory state into a memory cell by the data sense amplifier circuitry may be controlled and/or adjusted according to the memory operation (for example, restore, write, refresh).
- each of the aspects of the present inventions, and/or embodiments thereof may be employed alone or in combination with one or more of such aspects and/or embodiments.
- those permutations and combinations will not be discussed separately herein.
- the present inventions are neither limited to any single aspect (nor embodiment thereof), nor to any combinations and/or permutations of such aspects and/or embodiments.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05850314A EP1716600A1 (en) | 2004-12-22 | 2005-12-21 | Bipolar reading technique for a memory cell having an electrically floating body transistor |
KR1020077014246A KR101242239B1 (en) | 2004-12-22 | 2005-12-21 | Bipolar reading technique for a memory cell having an electrically floating body transistor |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US63866304P | 2004-12-22 | 2004-12-22 | |
US60/638,663 | 2004-12-22 | ||
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Also Published As
Publication number | Publication date |
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EP1716600A1 (en) | 2006-11-02 |
US20060131650A1 (en) | 2006-06-22 |
US7301803B2 (en) | 2007-11-27 |
US20080025083A1 (en) | 2008-01-31 |
KR101242239B1 (en) | 2013-03-12 |
US7477540B2 (en) | 2009-01-13 |
KR20070091299A (en) | 2007-09-10 |
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