A circuit for controlling a capacitor having a capacitance adjustable by biasing, including an amplifier for delivering a D.C. bias voltage, having a feedback slowed down by a resistive and capacitive cell.

A circuit for controlling a capacitor having a capacitance adjustable by biasing, including an amplifier for delivering a D.C. bias voltage, having a feedback slowed down by a resistive and capacitive cell.

According to the invention, a pressure receiving space of a pressure sensor is prevented from being charged. In the pressure sensor, a diaphragm is mounted on a base fixed in a cover to form the pressure receiving space in which oil is sealed. A semiconductor pressure detection device is provided in the pressure receiving space, and adjustment lead pins and an earth-terminal lead pin are connected to terminals of the semiconductor pressure detection device by bonding wires. A wiring substrate is provided with the base of the pressure receiving space interposed and faces the base, and a metal foil is provided such that one or more lead pins of the adjustment lead pins and the earth-terminal lead pin are electrically connected in the wiring substrate. Therefore, the charging of the insulative medium sealed in the pressure receiving space is prevented.

A method of forming a capacitor includes depositing a dielectric metal oxide layer of a first phase to a thickness no greater than 75 Angstroms over an inner conductive capacitor electrode material. The first phase dielectric metal oxide layer has a k of at least 15. Conductive RuO.sub.2 is deposited over and into physical contact with the dielectric metal oxide layer. Then, the RuO.sub.2 and the dielectric metal oxide layer are annealed at a temperature below 500 C. The RuO.sub.2 in physical contact with the dielectric metal oxide during the annealing facilitates a change of the dielectric metal oxide layer from the first phase to a second crystalline phase having a higher k than the first phase. The annealed dielectric metal oxide layer is incorporated into a capacitor dielectric region of a capacitor construction. Other implementations are disclosed.

There are provided PCB capacitor variable device and method. The PCB capacitor variable device includes: a PCB forming any parallel capacitor by disposing a dielectric layer between a first pattern and a second pattern; and a switch unit connected to a pattern of one of the capacitors to switch the pattern of one of the capacitors so as to control equivalent capacitance of the capacitor. According an exemplary embodiment of the present disclosure, the capacitor is implemented using the PCB pattern and the dielectric substance and therefore the miniaturization and weight lightening of the wireless communication system may be implemented. Further, according to an exemplary embodiment of the present disclosure, the capacitor may be selectively switched and therefore the optimized frequency required in the output of the amplification unit may be implemented.

A method of producing a ceramic component includes a) providing a main body having internal electrodes, outer edges of which are located on at least one first outer surface of the main body, b) contacting the first outer surface of the main body with a composition including an electrophoretically mobile insulating material and electrophoretically depositing the insulating material on outer edges of the internal electrodes on the first outer surface of the main body, and c) producing an insulating layer from the insulating material on the outer edges of the internal electrodes.

A method and apparatus for use in a digitally tuning a capacitor in an integrated circuit device is described. A Digitally Tuned Capacitor DTC is described which facilitates digitally controlling capacitance applied between a first and second terminal. In some embodiments, the first terminal comprises an RF+ terminal and the second terminal comprises an RF terminal. In accordance with some embodiments, the DTCs comprise a plurality of sub-circuits ordered in significance from least significant bit (LSB) to most significant bit (MSB) sub-circuits, wherein the plurality of significant bit sub-circuits are coupled together in parallel, and wherein each sub-circuit has a first node coupled to the first RF terminal, and a second node coupled to the second RF terminal. The DTCs further include an input means for receiving a digital control word, wherein the digital control word comprises bits that are similarly ordered in significance from an LSB to an MSB.

A method and apparatus for use in a digitally tuning a capacitor in an integrated circuit device is described. A Digitally Tuned Capacitor DTC is described which facilitates digitally controlling capacitance applied between a first and second terminal. In some embodiments, the first terminal comprises an RF+ terminal and the second terminal comprises an RF terminal. In accordance with some embodiments, the DTCs comprise a plurality of sub-circuits ordered in significance from least significant bit (LSB) to most significant bit (MSB) sub-circuits, wherein the plurality of significant bit sub-circuits are coupled together in parallel, and wherein each sub-circuit has a first node coupled to the first RF terminal, and a second node coupled to the second RF terminal. The DTCs further include an input means for receiving a digital control word, wherein the digital control word comprises bits that are similarly ordered in significance from an LSB to an MSB.

A pressure sensor includes a base having a bottom wall and a first sidewall enclosed with the bottom wall to form a first receiving space. A pressure sensitive film is located in the first receiving space and the peripheral portion of the pressure sensitive film is arranged on the first sidewall. An elastic cover has a top wall, a second sidewall, and a protrusion. The top wall and the second sidewall are enclosed to form a second receiving space. The second sidewall is located on the first sidewall of the base, the protrusion extends from the top wall to the second receiving space and makes contact with the pressure sensitive film, transferring an external pressure to the pressure sensitive film. The resistance of the pressure sensitive film is virtually linear corresponding to the external pressure.

Methods and apparatuses for use in tuning reactance are described. Open loop and closed loop control for tuning of reactances are also described. Tunable inductors and/or tunable capacitors may be used in filters, resonant circuits, matching networks, and phase shifters. Ability to control inductance and/or capacitance in a circuit leads to flexibility in operation of the circuit, since the circuit may be tuned to operate under a range of different operating frequencies.