frequency (Total 216454 Patents Found)

A variable high frequency voltage controlled oscillator (VCO) which is fully integrated. By controlling, with a control voltage, the collector current flowing through one transistor of the integrated oscillator circuit, the diffusion capacitance (also known as base-charging capacitance) of that transistor is varied. Si...
An arbitrary voltage distribution can be achieved in a high-voltage generator which supplied an X-ray tube having a metallic central part, wherein the anode voltage and the cathode voltage are generated in the high-voltage generator by two series-connected high-voltage rectifiers with respective preceding high-voltage ...
An apparatus for processing the ends of a coaxial high frequency cable, which has a tubular inner conductor, a dielectric enclosing the same, a tubular outer conductor arranged over the same concentrically to the inner conductor, and a sheath of insulation material enclosing the outer conductor. The apparatus includes ...
A control system for regulating the torque and speed of an alternating current wound rotor motor used in the traverse drive of an overhead travelling crane comprises an SCR bank controlled by a firing circuit responsive to actuation of an operator-controlled induction master control. The control system further comprise...
It has been difficult to form a high-frequency electronic circuit using a single-crystal dielectric substrate, and down-sizing of high-frequency electronic circuits is also difficult because of necessity of a metal housing. A high-frequency electronic device comprises a single-crystal dielectric substrate provided with...
A frequency converter device comprises a first converter 5 in a pulse-width modulation system for converting an AC voltage into a DC voltage; a second converter 2 in a pulse-width modulation system for supplying an AC voltage with a variable voltage and a variable frequency to a motor; a capacitor 15 connected between ...
A device such as an electric motor, an electric generator, or a regenerative electric motor includes at least one stator arrangement having a plurality of electromagnetic assemblies with each electromagnetic assembly including at least a portion of a magnetic core that is formed from thin film soft magnetic material. T...
A unique frequency synthesizer unit for use in a data processing system I/O interface unit for providing at least one clock signal having a substantially constant frequency which can be generated in response to any one of a plurality of input clock signals each having a different frequency. The system I/O interface uni...
A high-frequency signal generator has upper and lower conductive plates parallel to each other, at least one dielectric rod held between the upper and lower conductive plates, a metal mount sandwiched between the upper and lower conductive plates, a oscillating element mounted on a side of the mount for generating a hi...
A switch control ( 12 ) circuit which optimizes the efficiency of a buck or boost converter by eliminating simultaneous conductive states of the main power transistor ( 16 ) and the synchronous rectifying transistor ( 18 ). Power dissipation of the synchronous rectifying transistor ( 18 ) is minimized by reducing the a...
Methods and apparatus for rapidly and automatically syntonizing the frequency of a passive atomic resonator of an atomic clock with a reference frequency which corresponds to the frequency of an external reference signal. Any difference between the hyperfine transition frequency of the resonator and the reference frequ...
Apparatus and method of evaluating and installing a wireless system, and is suited for a radio frequency identification (RFID) system. The apparatus determines the suitability of a particular site for use with specific RFID tag types. The apparatus comprises a tag evaluation module having a drobe, a wireless transmitte...
A method for the pyrolytic deposition of a coating on a filament axially moving through a pyrolytic vapor deposition chamber comprising establishing a radio frequency electric field to heat a selected length of the filament and cause deposition thereon and regulating the density of the electric field to maintain a temp...
In this invention a computer system having a core unit and an enclosure for the core unit is disclosed. The core unit has the ability to determine the nature of the enclosure (be it a car, house, etc.) and to adjust its processor to perform the function required by the enclosure....
A high frequency pressure oscillation device that selective restricts the flow of breathing gas to or from a patient to produce pressure spikes in the patient's airway that facilitate clearing secretions from the patient's airway. The device includes a patient circuit that defines a closed path between a source...
A simple and cost effective optical device is provided which locks the wavelength output of a laser transmitter in an optical transmission system as well as substantially reducing and/or eliminating signal crosstalk. A light source is coupled along an optical path to a filtering element. The light source has output fre...
A high-frequency detecting element that can detect a temperature increase in an instant due to high-frequency wave absorption using semiconducting ceramic with positive resistance-temperature characteristics. The ceramic is composed mainly of barium titanate. A high-frequency heater incorporating the high-frequency det...
An ignition distributor for an internal combustion engine is provided with a novel rotor electrode which substantially reduces radio frequency interference generated by spark discharges across the rotor gap. At least the tip segment of the rotor electrode is formed of a composite material consisting of a first phase of...
In a semiconductor device which includes a semiconductor substrate, a collector region of a first conductivity type formed on the semiconductor substrate, a base region of a second conductivity type reverse to the first conductivity type, an emitter region of the first conductivity type formed within the base region, a...
A control circuit for a piezo transformer based power supply includes oscillator circuitry, drive circuitry, sense circuitry, and feedback circuitry collectively operating to regulate an operational parameter of the supply, such as the current supplied to a cold cathode fluorescent lamp (CCFL). The feedback circuitry i...
A video signal digital processing system comprises an A/D converter for converting an input analog video signal employing the NTSC or PAL system into a digital video signal, a first frequency converter for generating a signal sampled at a frequency f s which is a predetermined integer times a horizontal synchronizing ...
A digital-controlled oscillator (DCO) is utilized in an all-digital phase-locked loop for eliminating frequency discontinuities. The DCO includes a tank module and a negative gm cell. The tank module comprises a plurality of cells, at least a portion of the cells comprising a first tracking set and a second tracking se...
A waterproof structure of a high frequency communication apparatus accommodates a waveguide, the waveguide comprising a waveguide channel and an extending portion connected to the waveguide channel. The waterproof structure comprises a case body and a case cover. The case cover bonds with the case body to form an inner...
A channel impulse response for a channel is determined by determining an initial channel impulse response estimate based upon a stored training sequence and a received signal, by thresholding the initial channel impulse response estimate, by estimating a noise variance for the channel based upon the stored training seq...
Disclosed is an optical frequency controlling device for ultra-dense wavelength-division-multiplexed optical channels in which center frequencies of optical channels are aligned. An optical frequency controlling device for ultra-dense wavelength-division-multiplexed optical channels of the present invention comprises a...
A voltage-controlled oscillator includes a plurality of variable delay circuits, wherein a first differential output signal of an adjacent previous stage is provided as a first differential input signal and a second differential output signal of a second previous stage is provided as a second differential input signal....
A linearization system is provided for a Fractional-N Offset Phase Locked Loop (FN-OPLL) in a frequency or phase modulation system. In general, the linearization system processes a modulation signal to provide a linearized modulation signal to a fractional-N divider in a reference path of the FN-OPLL such that a freque...