3370 results about "Variable resistance" patented technology

One embodiment of the present invention includes a low-cost unipolar rewritable variable-resistance memory device, made of cross-point arrays of memory cells, vertically stacked on top of one another and compatible with a polycrystalline silicon diode.

An integrated circuit memory cell including: a semiconductor having a first active area, a second active area, and a channel between the active areas; and a layer of a variable resistance material (VRM) directly above the channel. In one embodiment, there is a first conductive layer between the VRM and the channel and a second conductive layer directly above the VRM layer. The VRM preferably is a correlated electron material (CEM). The memory cell comprises a FET, such as a JFET or a MESFET. In another embodiment, there is a layer of an insulating material between the VRM and the channel. In this case, the memory cell may include a MOSFET structure.

Dummy cells are disposed in alignment with memory cells arranged in rows and columns in a memory array. The memory cell includes a variable resistance element and a select transistor having a collector connected to a substrate region and selecting the variable resistance element in response to a row select signal. Corresponding to a row of memory cells, there is provided a word line connecting to memory cells on corresponding row and transmitting the row select signal, and a word line shunting line electrically connected at predetermined intervals to each word line. Moreover, corresponding to a row of dummy cells and a column of dummy cells, there is provided substrate shunt lines electrically connected to the substrate region. The voltage distribution in the substrate region is eliminated to achieve stable operating characteristics of the memory cell transistor. In addition, a word line is driven at high speed by a word line shunt structure.

A rehabilitation apparatus with at least three degrees of freedom of motion, comprising: a plurality of brakes; a motor, wherein the motor is operationally connected to the brakes; a plurality of surfaces, wherein each of a plurality of the surfaces correlates to a brake; and, wherein when the motor is activated, the brakes are selectively advanced to make contact with the surfaces causing friction between the brakes and the surfaces and thus causing variable resistance in the three degrees of freedom to the apparatus based on the extent of advancement of the brakes.

Provided is a variable resistance random access memory device having an n+ interfacial layer and a method of fabricating the same. The variable resistance random access memory device may include a lower electrode, an n+ interfacial layer on the lower electrode, a buffer layer on the n+ interfacial layer, an oxide layer on the buffer layer and having a variable resistance characteristic and an upper electrode on the oxide layer.

An improved damping apparatus that utilizes a fluid having a viscosity that may be varied by the application of an electromagnetic field, such as a magnetorheological fluid or an electrorheological fluid, to provide the damping response. The damping apparatus includes a linear to rotary conversion mechanism which comprises a translatable member that is adapted for linear translation in a forward and a reverse direction and a rotatable member comprising a rotatable shaft that is rotatably coupled to the translatable member; wherein translation of the translatable member in one of the forward or the reverse directions produces a forward or a reverse rotation of the rotatable member and shaft, respectively. The damping apparatus also includes a damping mechanism which comprises a hub that is fixed to the shaft, a means for generating a variable electromagnetic field in response to an applied electrical signal that may be continuously varied in response to an input signal that is representative of a desired damping force and a fluid having a viscosity that may be continuously varied by application of the electromagnetic field that is in touching contact with the hub. Application of the variable electromagnetic field to the fluid produces changes in the viscosity of the fluid that in turn provides variable resistance to rotation of the hub and resistance to translation of the translatable member, thereby providing a damping apparatus with a continuously variable damping response.

The present invention employs a memory cell structure in that one end of a variable resistance element (1) for storing information by change of electric resistance is connected to a source of a selection transistor (2) to form a memory cell (3) and, in a memory cell array (4), a drain of the selection transistor (2) is connected to a common bit line (BL) in a column direction, the other end of the variable resistance element (1) is connected to a source line (SL) and a gate of the selection transistor (2) is connected to a common word line (WL) in a row direction. In the memory cell structure, an operation of resetting data stored in the memory cell (3) is carried out for each of sectors including the plural memory cells (3) commonly connected to the source line (SL).

An automatically adjusting magnetic resistance unit for an exercise device such as a bicycle trainer, in which the degree of resistance is automatically and non-linearly adjusted in relation to the rotational speed of a rotating member caused by the input of a user. The rotating member may be in the form of a flywheel having a number of supports extending between a hub and a rim. The supports define longitudinal grooves which slidably retain magnets that are biased inwardly toward the hub by biasing members. An electrically conductive member is located adjacent the flywheel. As the flywheel rotates in response to rotation of the bicycle wheel, the magnets interact with the conductive member to establish eddy currents that provide resistance to the rotation of the flywheel. The speed of rotation of the flywheel increases as the speed of rotation of the bicycle wheel increases, and centrifugal forces act on the magnets to cause the magnets to slide outwardly along the grooves in opposition to the bias of the biasing members. The outward movement of the magnets causes outward movement of the eddy current forces, to increase the resistance provided to rotation of the flywheel and the bicycle wheel. The variable resistance due to the increased or decreased rotational speed of the flywheel is smooth, based on the constant interaction of the counteracting forces of the biasing members and the centrifugal forces acting on the magnets.

A semiconductor memory device comprises an array of memory cells each comprising a variable resistance element and a cell access transistor, and a voltage supplying means for applying the first voltage between the bit and source lines connected to the selected memory cell, the third voltage to the word line to apply the first write voltage between the two ports of the variable resistance element for shifting the resistance from the first state to the second state, and the second voltage opposite in polarity to the first voltage between the bit and source lines, the third voltage to the word line to apply the second write voltage opposite in polarity to and different in the absolute value from the first write voltage between the two ports for shifting the resistance from the second state to the first state, the voltage supplying means comprising an n-channel MOSFET and a p-channel MOSFET.

In a semiconductor memory device and method, phase-change memory cells are provided, each including a plurality of control transistors formed on different layers and variable resistance devices formed of a phase-change material. Each phase-change memory cell includes a plurality of control transistors formed on different layers, and a variable resistance device formed of a phase-change material. In one example, the number of the control transistors is two. The semiconductor memory device includes a global bit line; a plurality of local bit lines connected to or disconnected from the global bit line via local bit line selection circuits which correspond to the local bit lines, respectively; and a plurality of phase-change memory cell groups storing data while being connected to the local bit lines, respectively. Each of the phase-change memory cells of each of the phase-change memory cell groups comprises a plurality of control transistors formed on different layers, and a variable resistance device formed of a phase-change material. In addition, the semiconductor memory device has a hierarchical bit line structure that uses a global bit line and local bit lines. Accordingly, it is possible to increase both the integration density of the semiconductor memory device and the amount of current flowing through each of the phase-change memory cells.

A memory cell of a resistive semiconductor memory device, a resistive semiconductor memory device having a three-dimensional stack structure, and related methods are provided. The memory cell of a resistive semiconductor memory device includes a twin cell, wherein the twin cell stores data values representing one bit of data. The twin cell includes a main unit cell connected to a main bit line and a word line, and a sub unit cell connected to a sub bit line and the word line. Also, the main unit cell includes a first variable resistor and a first diode, and the sub unit cell includes a second variable resistor and a second diode.

A rechargeable battery system and method are disclosed, in which an implantable medical device (IMD) regulates its transfer of energy from a separate charger unit. For recharging, a charger unit is brought into proximity to the implanted device. An oscillating current is generated in a primary coil, located in the charger. By inductive coupling through an oscillating magnetic field, an alternating current is generated in a secondary coil, which is implanted in or near the implanted device. The alternating current then passes through a half-wave or full-wave rectifier to form a one-sided current, then passes through a regulator to form an essentially direct current, which is in turn directed to the rechargeable battery in the implanted device. The secondary coil has a controllable damped resonant frequency, which can be dynamically tuned away from the driving frequency of the primary coil by a variable resistor and/or by varying a duty cycle of a rapidly switched electrical element. If a control loop in the implant senses that more power is being received at the second coil than is actually being used to recharge the battery, the control loop temporarily changes the variable resistance. When this happens, the resonant frequency of the secondary coil is detuned slightly away from the driving frequency, so that less of the incoming power is absorbed by the secondary coil. Alternatively, the secondary coil may be temporarily short-circuited. With less or no excess power entering the circuitry of the implant, the problem of overheating is mitigated.

The present disclosure provides a systems devices and methods for an exercise gaming platform particularly suited for multiple users. The exercise gaming platform has a variable resistance exercise device operatively coupled to a virtual reality environment rendered by a computer such that user exercise motion on the variable resistance exercise device translates to movement of an avatar representing the user in the virtual reality environment and wherein the virtual reality environment has collision objects capable of a collision with the avatar representing the user in the virtual environment, and wherein the collision of a collision object with the avatar representing the user in the virtual environment causes the resistance level of the user's variable resistance exercise device to change. Also disclosed are methods for providing power to virtual machines and methods for procedurally generating virtual terrain changes in response to changes of resistance on a variable resistance exercise device.

A non-volatile variable resistance memory device and a method of fabricating the same are provided. The non-volatile variable resistance memory device may include a lower electrode, a buffer layer on the lower electrode, an oxide layer on the buffer layer and an upper electrode on the oxide layer. The buffer layer may be composed of an oxide and the oxide layer may have variable resistance characteristics.

A proximity sensor for a transcranial magnetic stimulation (TMS) system detects the proximity of a TMS coil assembly to a position at which the coil is to receive pulses during TMS treatment and provides feedback to the operator so that the operator may adjust the TMS coil assembly as necessary to maintain optimal positioning during treatment. A flexible substrate containing a sensor or sensor array is disposed between the TMS coil assembly and the position such that the coupling of the TMS coil assembly to the position may be detected by the sensor(s). Sensor outputs are processed by signal processing circuitry to provide an indication of whether the TMS coil assembly is properly disposed with respect to the position during TMS treatment. A display may be used to provide an indication of how to adjust the TMS coil assembly to improve the positioning of the TMS coil assembly. On the other hand, a sound generator may be used to generate a sound that indicates to an operator whether the TMS coil assembly is properly positioned at the position. Many different types of sensor devices may be used to detect proximity, including membrane switches, variable resistance sensors, resistive strips, touch screens, pickup loops, fluid displacement sensors, optical sensors, acoustic sensors, inductive coupling sensors, capacitive coupling sensors, temperature sensors, and the like.