7799 results about "High resistance" patented technology

A semiconductor device is provided, which comprises a semiconductor layer over an insulating surface, and an insulating layer over the semiconductor layer. The semiconductor layer includes at least two element regions, and an element separation region. The element separation region is disposed between the two element regions. The element separation region includes at least one impurity element selected from the group consisting of oxygen, nitrogen, and carbon. The element separation region has higher resistance than a first source and drain regions included in one of the two element regions and a second source and drain regions included in the other of the two element regions.

A nonvolatile memory cell is provided, the cell comprising a transistor in series with resistance-switching material, which can be switched between at least two stable resistance states, for example a high-resistance state and a low-resistance state. In preferred embodiments the transistor is a TFT, having a channel region not formed in a monocrystalline wafer substrate. In preferred embodiments the transistor may have either a vertically oriented channel or a laterally oriented channel. Either embodiment can be formed in a monolithic three dimensional memory array in which multiple memory levels can be formed above a single substrate, forming a highly dense nonvolatile memory array.

A computer keyboard has a grid of conductors forming a plurality of intersections, with force-sensitive resistor (FSR) elements located between the conductors at the intersections. A plurality of keys are located above the intersections and exert force on the conductors and FSR elements during key presses. A resistor network sub-circuit is connected to some of the conductors, and is switchable between low and high resistance values. An Analog to Digital Converter (ADC) is coupled to the resistor network sub-circuit. A microprocessor grounds a conductor and tests another conductor for a threshold voltage level while the resistor network is switched to the high resistance value. The microprocessor switches the resistor network to the low resistance value upon detecting the threshold voltage level and subsequently receives from the ADC a digital value of a voltage on the tested conductor.

A semiconductor device includes: a semiconductor layer of a first conductivity type; a first semiconductor pillar region of the first conductivity type provided on a major surface of the semiconductor layer; a second semiconductor pillar region of a second conductivity type provided adjacent to the first semiconductor pillar region on the major surface of the semiconductor layer, the second semiconductor pillar region forming a periodic arrangement structure substantially parallel to the major surface of the semiconductor layer together with the first semiconductor pillar region; a first main electrode; a first semiconductor region of the second conductivity type; a second semiconductor region of the first conductivity type; a second main electrode; a control electrode; and a high-resistance semiconductor layer provided on the semiconductor layer in an edge termination section surrounding the first semiconductor pillar region and the second semiconductor pillar region. The high-resistance semiconductor layer has a lower dopant concentration than the first semiconductor pillar region. A boundary region is provided between a device central region and the edge termination section. The first semiconductor pillar region and the second semiconductor pillar region adjacent to the high-resistance semiconductor layer in the boundary region have a depth decreasing stepwise toward the edge termination section.

Nucleoside analogues expressed by the following general formula

• • where B represents an aromatic base having carbonyl oxygen at the 2-position, or a 2-hydroxyphenyl group, or oligonucleotide derivatives containing one or more of the nucleoside analogues are provided.

The oligonucleotide derivatives are triplex-forming oligonucleotide derivatives which bind specifically to target double-stranded DNA with high affinity in the antigene method to form triplexes, and can thereby control and inhibit the expression of relevant genes efficiently, and which show high resistance to nucleases.

A two terminal switching device includes first and second conductive terminals and a nanotube article. The article has at least one nanotube, and overlaps at least a portion of each of the first and second terminals. The device also includes a stimulus circuit in electrical communication with at least one of the first and second terminals. The circuit is capable of applying first and second electrical stimuli to at least one of the first and second terminal(s) to change the relative resistance of the device between the first and second terminals between a relatively high resistance and a relatively low resistance. The relatively high resistance between the first and second terminals corresponds to a first state of the device, and the relatively low resistance between the first and second terminals corresponds to a second state of the device.

A system is disclosed for generating and transmitting data signals to the surface of the earth while drilling a borehole, the system operating by generating pressure pulses in the drilling fluid filling the drill string. The system is designed to maximize signal strength while minimizing the probability of jamming by drilling fluid particulates. The system uses a rotary valve modulator consisting of a stator with flow orifices through which drilling fluid flows, and a rotor which rotates with respect to the stator thereby opening and restricting flow through the orifices and thereby generating pressure pulses. The flow orifices with the stator in a "closed" position are configured to reduce jamming, and to simultaneously minimize flow area in order to maximize signal strength. This is accomplished by imparting a shear to the fluid flow through the modulator, and minimizing the aspect ratio and maximizing the minimum principal dimension of the closed flow area. A preferred embodiment and three alternate embodiments of the modulator are disclosed.

Integrated circuit antifuse circuitry is provided. A metal-oxide-semiconductor (MOS) antifuse transistor serves as an electrically-programmable antifuse. In its unprogrammed state, the antifuse transistor is off and has a relatively high resistance. During programming, the antifuse transistor is turned on which melts the underlying silicon and causes a permanent reduction in the transistor's resistance. A sensing circuit monitors the resistance of the antifuse transistor and supplies a high or low output signal accordingly. The antifuse transistor may be turned on during programming by raising the voltage at its substrate relative to its source. The substrate may be connected to ground through a resistor. The substrate may be biased by causing current to flow through the resistor. Current may be made to flow through the resistor by inducing avalanche breakdown of the drain-substrate junction or by producing Zener breakdown of external Zener diode circuitry connected to the resistor.

A bistable electrical device (50) employing a bistable body (52) and a high conductivity material (54). A sufficient amount of high conductivity material (54) is included in the bistable body (52) to impart bistable between a low resistance state and a high resistance state by application of an electrical voltage (60).

Systems and methods for delivering implantable devices, catheters, or substances in or near and/or restoring flow through body lumens, such as blood vessel lumens are described. A catheter having a proximal portion of a first diameter and a distal portion of a second diameter (smaller than the first diameter) is advanced into a body lumen. The distal portion of the catheter is caused to expand to a diameter that is larger than the second diameter but no larger than the first diameter. A working device is then advanced out of the distal end of the catheter and used to remove obstructive matter, deliver an implantable device or substance and/or restore flow. The distal portion can be reduced in diameter prior to removal from the body. A stand alone, guide catheter is also disclosed possessing high resistance to kinking even with a very thin wall.

Peripheral devices store data in non-volatile phase-change memory (PCM). PCM cells have alloy resistors with high-resistance amorphous states and low-resistance crystalline states. The peripheral device can be a Multi-Media Card/Secure Digital (MMC/SD) card. A PCM controller accesses PCM memory devices. Various routines that execute on a CPU in the PCM controller are activated in response to commands in the host-bus transactions. The PCM system increases the throughput of one or more phase-change memory devices by performing one or more of a read-ahead memory operation, a write-ahead memory write operation, a larger page memory write operation, a wider data bus memory write operation, a multi-channel concurrent multi-bank interleaving memory read or write operation, a write-cache memory write operation, and any combination thereof.

A semiconductor device has: a buffer layer formed on a conductive substrate and made of Al_xGa_1-xN with a high resistance; an element-forming layer formed on the buffer layer, having a channel layer, and made of undoped GaN and N-type Al_yGa_1-yN; and a source electrode, a drain electrode and a gate electrode which are selectively formed on the element-forming layer. The source electrode is filled in a through hole provided in the buffer layer and the element-forming layer, and is thus electrically connected to the conductive substrate.

The invention provides a novel high-temperature Ti alloy with high heat resistance and high heat stability. The alloy contains eutectic Nb, Ta and Mo elements. Based on the appropriate proportion of these three elements, the alloy is superior in high resistance and stability to heat and good antioxidant effect. The alloy contains (by weight) Al 5.0-6.3 percent, Sn 3.0-5.0 percent, Zr 2.5-7.0 percent, Mo 0.2-1.5 percent, Si 0.20-0.55 percent, Nb 0.2-1.0 percent, Ta 0.2-3.0 percent, C 0.01-0.09 percent, and Ti and other inevitable impurities in balance. The alloy is an ideal alternative material for high-temperature parts of aircraft engine, such as wheel disk, drum barrel, barrel shaft and blade.

In a non-volatile phase change memory, information is recorded by utilizing a change in resistance of a phase change portion. When the phase change portion is allowed to generate Joule's heat and is held at a specific temperature, it goes into a state of a low resistance. At this time, if a constant voltage source is used, not only the phase change portion assumes a state of a low resistance, but also a large current flows, so that a sample concerned is overheated and goes into a state of a high resistance. Thus, it is difficult to make the phase change portion low in resistance stably. When the gate voltage of a memory cell selection transistor QM is controlled with MISFET to afford a low resistance state, the maximum amount of current applied to the sample is limited by the application of a medium-state voltage.

A method and system for providing a magnetic memory is described. The magnetic memory includes magnetic storage cells in an array, bit lines, and source lines. Each magnetic storage cell includes at least one magnetic element. The magnetic element(s) are programmable by write currents driven through the magnetic element(s). Each magnetic element has free and pinned layer(s) and a dominant spacer. The magnetic memory is configured such that either the read current(s) flow from the free layer(s) to the dominant spacer if the maximum low resistance state read current divided by the minimum low resistance state write current is greater than the maximum high resistance state read current divided by the minimum high resistance state write current or the read current(s) flow from the dominant spacer to the free layer(s) if the maximum low resistance state read current divided by the minimum low resistance state write current is less than the maximum high resistance state read current divided by the minimum high resistance state write current.

Integrated circuit antifuse circuitry is provided. A metal-oxide-semiconductor (MOS) transistor serves as an electrically-programmable antifuse. The antifuse transistor has source, drain, gate, and substrate terminals. The gate has an associated gate oxide. In its unprogrammed state, the gate oxide is intact and the antifuse has a relatively high resistance. During programming, the gate oxide breaks down, so in its programmed state the antifuse transistor has a relatively low resistance. The antifuse transistor can be programmed by injecting hot carriers into the substrate of the device in the vicinity of the drain. Because there are more hot carriers at the drain than at the substrate, the gate oxide is stressed asymmetrically, which enhances programming efficiency. Feedback can be used to assist in turning the antifuse transistor on to inject the hot carriers.