32results about How to "Maximize capacitance" patented technology

A memory device includes a plurality of memory cells arranged in series in the semiconductor body, such as a NAND string, having a plurality of word lines. A selected memory cell is programmed by hot carrier injection using a boosted channel potential to establish the heating field. Boosted channel hot carrier injection can be based on blocking flow of carriers between a first side of a selected cell and a second side of the selected cell in the NAND string, boosting by capacitive coupling the first semiconductor body region to a boosted voltage level, biasing the second semiconductor body region to a reference voltage level, applying a program potential greater than a hot carrier injection barrier level to the selected cell and enabling flow of carriers from the second semiconductor body region to the selected cell to cause generation of hot carriers.

A capacitive micro-machined ultrasonic transducer (CMUT) array includes an improved elementary aperture for imaging operations. The transducer can be of a linear, curved linear, annular, matrix or even single surface configuration. The elementary apertures thereof are formed by a specific arrangement of capacitive micromachined membranes (CMM) so as to exhibit ideal acoustical and electrical behavior when operated with imaging systems. The CMM arrangements can be either conventional where the element transducers of the array are uniformly shaped by predefined CMMs in a manner such as to exhibit acoustic behavior similar to a piezoelectric transducer, or can be more sophisticated, wherein each element transducer is formed by a specific combination of different CMMs (i.e., of a different size and/or shape) so as to provide the transducer with built-in acoustic apodization that can be implemented in the azimuth and/or elevation dimension of the device.

The piezoelectric thin-film tuning fork resonator (40) comprises an integral tuning fork made out of a quartz crystal. The tuning fork comprises a base (48) and a pair of parallel vibrating arms (44, 46) extending from the base. Each of the vibrating arms carries:

• • first and second electrodes (62, 64) provided on at least one main surface of the arm, said first and second electrodes being formed respectively on an inner portion and on an outer portion of said one main surface, in such a way as to be spaced apart,
  • first and second piezoelectric thin films (66, 68) formed over the first and second electrodes respectively,
  • third and fourth electrodes (70, 72) formed over the first and second piezoelectric thin films respectively.

An electric machine including multiple windings, a switch circuit connected to each of the windings, a positive bus bar, and a negative bus bar. The switch circuits are in communication with the windings to selectively energize each of the windings. The positive bus bar is a conductive plate connected to the switch circuits and the negative bus bar is a conductive plate positioned substantially parallel to the positive bus bar and connected electrically to the switch circuits.

A capacitor sensor array (or grid) over a wireless power transmission coil can include a first set of lines; a second set of lines intersecting the first set of lines; a first multiplexer coupled to provide a charge (e.g. in the form of a DC voltage) from a voltage source to the first set of lines and provide first signals to detect voltages on each line; and a second multiplexer coupled to provide a charge from the voltage source to the second set of lines and provide second signals to detect voltages on each line, wherein an object positioned with respect to the first set of lines and the second set of lines is located. According to some embodiments, a wireless power receive coil and a rectifier circuit can be used in forming a capacitor sensor, to sense the capacitance between the receive and transmit coils for better alignment between the two coils. Other embodiments are also provided.

This invention relates to a method for improving the chemical and electrical performance characteristics of a high dielectric constant material. The method comprises the steps of first obtaining a barium containing high dielectric constant material, the material having an upper surface and then modifying the surface chemistry of said upper surface by interacting said upper surface with a gas reactant in a closed environment. In a variant of the method, the gas reactant preferentially reacting with upper surface as compared to the bulk.

A method of producing an electrode for use in the manufacture of electrolytic capacitors for implantable cardioverter defibrillators comprises first growing a hydrate layer and/or formed oxide layers of the foil, applying a laser beam to portions of the foil to ablate the aluminum oxide foil surface before etching in order to induce etching in the specific areas, and then, etching the foil. The laser marks the oxide layer in a pulsed spot pattern through the hydrate layer and/or formed oxide layer leaving a dimpled nascent aluminum surface. The oxide layer left behind is a mask and the fresh aluminum areas are the high etching activation sites. After marking the aluminum oxide foil surface, the foil may be electrochemically etched in an electrolyte containing chloride and/or various oxidative species.

A capacitor circuit having improved reliability includes at least first and second capacitors, a first terminal of the first capacitor connecting to a first source providing a first voltage, a first terminal of the second capacitor connecting to a second source providing a second voltage, the first voltage being greater than the second voltage. The capacitor further includes a voltage comparator having a first input for receiving a voltage representative of the first voltage, a second input for receiving a third voltage provided by a third source, and an output for generating a control signal. The control signal is a function of a difference between the voltage representative of the first voltage and the third voltage. A switch is connected to second terminals of the first and second capacitors. The switch is selectively operable in one of at least a first mode and a second mode in response to the control signal, wherein in the first mode the switch is operative to connect the first and second capacitors together in parallel, and in the second mode the switch is operative to connect the first and second capacitors together in series. The first mode is indicative of the voltage representative of the first voltage being less than or about equal to the third voltage, and the second mode is indicative of the voltage representative of the first voltage being greater than the third voltage.

The invention describes a capacitive power transfer arrangement (1) for transferring power between a first electrical device (10) and a physically independent second electrical device (20), which power transfer arrangement (1) comprises a number of coupled capacitors (C1, C2), and wherein a coupled capacitor (C1, C2) comprises a first electrode (C1₁₀, C2₁₀), which first electrode (C1₁₀, C2₁₀) comprises a heatsink (H1, H2) thermally coupled to a heat dissipating component (Q, 14) of a power supply (12) of the first electrical device (10); a second electrode (C1₂₀, C2₂₀) realized in the second electrical device (20); and a dielectric layer (D) formed by a housing (16, 26) of at least one of the electrical devices (10, 20). The invention further describes a method of performing capacitive power transfer from a first electrical device (10) to a physically independent second electrical device (20); a driver (11) of an electrical device (10); and n electrical device (10) comprising such a driver (11).

A method for the preparation of an electrode comprising a substrate made of an aluminium based material, vertically aligned carbon nanotubes and an electrically conductive polymer matrix, the method comprising the following successive steps: (a) synthesising, on a substrate made of an aluminium based material, a carpet of vertically aligned carbon nanotubes according to the technique of CVD (Chemical Vapour Deposition) at a temperature less than or equal to 650° C.; (b) electrochemically depositing the polymer matrix on the carbon nanotubes from an electrolyte solution including at least one precursor monomer of the matrix, at least one ionic liquid and at least one protic or aprotic solvent. Further disclosed is the prepared electrode and a device for storing and returning electricity such as a supercapacitor comprising the electrode.