Patents Issued in April 24, 2003
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Publication number: 20030076158Abstract: A low power wide swing current mirror circuit wherein the signal current is separated from the bias current, and a bias current sink is connected in parallel with a current mirror so as to shunt the bias current to the circuit common.Type: ApplicationFiled: October 24, 2001Publication date: April 24, 2003Inventor: Reghu Rajan
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Publication number: 20030076159Abstract: A circuit including a reference element adapted to provide a reference current and having a control terminal and a first terminal, there being a voltage (Vct) between the control terminal and the first terminal of the reference element, and a plurality of series-connected stack elements, each the stack element including a first terminal connected to a first voltage, and a control tern connected to a second terminal, the stack elements being adapted to receive at least one of the reference current and a multiple of the reference current, the stack elements and the reference element being matched such that a voltage between the control terminal and the first terminal of at least one of the stack elements is generally the same as Vct.Type: ApplicationFiled: October 24, 2001Publication date: April 24, 2003Inventors: Joseph S. Shor, Eduardo Maayan
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Publication number: 20030076160Abstract: A start-up section is made up of an input transistor configured to receive at its gate a voltage at a node which varies with the magnitude of a current flowing in one branch of a current mirror in a reference voltage generation section, an inverter for reversing a drain voltage of the input transistor, an output transistor for supplying a start-up current to the reference voltage generation section in response to an output voltage from the inverter, and a current limit transistor serially connected to the input transistor. The current limit transistor receives a reduced gate-source voltage from the reference voltage generation section for limiting a flow of current in the input transistor upon completion of restarting the reference voltage generation section.Type: ApplicationFiled: December 2, 2002Publication date: April 24, 2003Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Yoshitsugu Inagaki, Koji Oka
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Publication number: 20030076161Abstract: A band-pass filter with at least one passband, which is real, bidimensional, oriented along the phase axis and resulting from the product of two identical one-dimensional Hamming windows, the transfer function of each of these windows being: 1 X i ⁡ ( f ) = α i + ( 1 - α i ) ⁢ cos ⁢ π ⁡ ( f - f ⁢ ⁢ q i ) f0 i , w ⁢ ⁢ h ⁢ ⁢ e ⁢ ⁢ r ⁢ ⁢ eType: ApplicationFiled: October 18, 2002Publication date: April 24, 2003Inventor: Christel-Loic Tisse
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Publication number: 20030076162Abstract: The invention relates to a low-noise amplifier circuit and a method for amplifying low-power signals in a low-noise manner. Said signals are supplied to the inputs of several amplifiers (20 . . . 29) which are arranged in parallel. The output signals of said amplifiers (20 . . . 29) are multiplied by each other.Type: ApplicationFiled: September 17, 2002Publication date: April 24, 2003Inventor: Ralf Brederlow
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Publication number: 20030076163Abstract: A differential amplifying apparatus includes first and second differential pair circuits having opposite conductivity, first and second current sources, first and second current mirror circuits, and a first voltage amplifying circuit. The first current source is connected between the first differential pair circuit and a first power source terminal, biasing the first differential pair circuit. The second current source is connected between the second differential pair circuit and a second power source terminal, biasing the second differential pair circuit. The first current mirror circuit is connected between a corresponding output terminal of the second differential pair circuit and the first power source terminal. The second current mirror circuit is connected between a corresponding output terminal of the second differential pair circuit and the first power source terminal. The first voltage amplifying circuit amplifies voltages from the first differential pair circuit and outputs amplified voltages.Type: ApplicationFiled: September 20, 2002Publication date: April 24, 2003Applicant: Ricoh Company, Ltd.Inventor: Makoto Hangaishi
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Publication number: 20030076164Abstract: A method and apparatus for frequency shift-keying (FSK) demodulation includes processing that begins by generating a charge signal, a data acquisition signal, and a reset signal from an I component and a Q component of an FSK modulated signal. The processing continues by generating a delta frequency signal based on the charge signal, the data acquisition signal, and the reset signal. The delta frequency signal is representative of the frequency difference used within the FSK modulation to indicate a logic 1 and a logic 0. The processing then continues by demodulating the delta frequency signal to recapture a stream of data.Type: ApplicationFiled: October 23, 2001Publication date: April 24, 2003Inventor: Shahia Khorram
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Publication number: 20030076165Abstract: A system and method for detecting the presence of a transmitted waveform in a high noise environment. The system and method can detect and classify a modulated waveform without first demodulating the single, and can detect and classify a waveform having a frequency offset without compensating for the frequency offset.Type: ApplicationFiled: October 19, 2001Publication date: April 24, 2003Inventors: William Nelson Furman, John Wesley Nieto
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Publication number: 20030076166Abstract: A composite amplifier includes a main power amplifier (10) and an auxiliary power amplifier (12), which are connected to a load (26) over a Doherty output network. An attenuator (34) is provided for activating the auxiliary power amplifier (12) before the main amplifier (10) is saturated. Preferably the input drive voltage to the auxiliary power amplifier (12) is increased along a smooth curve as the input signal amplitude to the composite amplifier increases.Type: ApplicationFiled: December 5, 2002Publication date: April 24, 2003Inventor: Richard Hellberg
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Publication number: 20030076167Abstract: A multistage Doherty amplifier is provided with separate drive amplifiers (DR4-DR5) for individual power amplifier (PA4-PA5) and/or separate drive amplifiers (DR) for groups of power amplifiers (PA1-PA3). This makes it possible to make significant improvements in efficiency and linearity by optimizing the drive for the different power amplifiers and using only a minimum of drive power.Type: ApplicationFiled: December 5, 2002Publication date: April 24, 2003Inventor: Richard Hellberg
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Publication number: 20030076168Abstract: A wireless communication device comprises a power amplifier configured to amplify a power level of a transmit signal to a required transmit power level and a transmission line coupled with the power amplifier. The transmission line is configured to convey the amplified transmit signal. The wireless communication device also comprises a power control circuit that includes a bi-directional coupler detector coupled with the transmission line. The bi-directional coupler detector is configured to sense a forward power level and a reflected power level in the transmission line. The power control circuit may be configured to adjust the required transmit power level based at least in part on the forward and reflected power levels sensed by the bi-directional coupler detector. The power control circuit may also adjust an impedance of an impedance matching circuit based at least in part on the reflected power level sensed by the bi-directional coupler detector.Type: ApplicationFiled: October 22, 2001Publication date: April 24, 2003Inventor: Tim Forrester
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Publication number: 20030076169Abstract: A translinear variable-gain amplifier. The translinear variable gain amplifier receives a differential input voltage and produces a differential output current having a selected gain. The amplifier comprises a buffer amplifier that receives the differential input voltage and produces a differential input current. The amplifier further comprises a translinear gain cell coupled to receive the differential input current and produce the differential output current. The gain cell includes a first adjustable bias source that operates to set a linear input range of the gain cell, and a second adjustable bias source that operates to set a gain value of the gain cell.Type: ApplicationFiled: August 27, 2002Publication date: April 24, 2003Inventors: John B. Groe, Michael Farias
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Publication number: 20030076170Abstract: A variable-gain amplifier that prevents the change in the in-phase voltage of the output occurring when the gain is changed and improves the frequency characteristic compared with the conventional method. The differential current of currents I13 and I13′ changes corresponding to input signal S1. As a result, the differential current of currents I11 and I12 also change correspondingly, and the differential voltage v13 between nodes N1 and N2 varies. The gain of differential voltage v13 with respect to input signal S1 is variable corresponding to the current conversion gains of current converters 2 and 3. When the current conversion gains vary corresponding to the input signal S2, the voltages at nodes N1′ and N2′ are adjusted such that the voltages at nodes N1 and N2 are constant with respect to the change in gain.Type: ApplicationFiled: October 22, 2002Publication date: April 24, 2003Inventor: Hiroki Honda
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Publication number: 20030076171Abstract: A power amplifier that utilizes a minimum amount of power, and, simultaneously, inhibits the generation of distortion is described. The power amplifier includes a differential input terminal, an output terminal, a negative feedback circuit, and an adaptive bias current control circuit. The differential input terminal receives a first voltage and a second voltage respectively through a first terminal and a second terminal, and outputs a current corresponding to a difference in the input voltages. The output terminal outputs an amplified signal corresponding to the current output by the differential input terminal. The negative feedback circuit performs negative feedback of an output voltage of the output terminal and provides the output voltage to the first terminal of the differential input terminal. The adaptive bias current control circuit controls a bias current of the output terminal according to distortion information corresponding to the difference between the first voltage and the second voltage.Type: ApplicationFiled: April 30, 2002Publication date: April 24, 2003Inventors: Jong-Tae Hwang, Han-Seung Lee
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Publication number: 20030076172Abstract: Embodiments of the present invention provide an amplifier circuit and method that can be used to save power or reduce distortion in an electronic system, such as a wireless communication system. In one embodiment, the present invention includes an amplifier circuit comprising a transistor having a gate terminal, drain terminal, body terminal, and a load. An input signal has different signal envelopes during different time periods. A control signal coupled to the body terminal is used to change the voltage on the body terminal when the input receives different envelopes. Accordingly, the amplifier can be biased to use less power when lower envelopes are being received. Electronic systems, such as wireless communication systems, can realize advantageous performance enhancements by utilizing the amplifier and other techniques employed by embodiments of the present invention.Type: ApplicationFiled: September 26, 2002Publication date: April 24, 2003Applicant: PowerQ Technologies, Inc.Inventor: Larry Martin Tichauer
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Publication number: 20030076173Abstract: A broadband RF signal amplifier includes a plurality of transistors attached to a surface of a pedestal, each transistor having an input and an output. An RF input path electrically connected to the transistor inputs includes a passive splitter implemented in a multi-layer printed circuit board and configured to split a RF input signal into a plurality of component input signals. A plurality of corresponding input matching networks including one-quarter wavelength transmission lines implemented in the printed circuit board couple respective component input signals to the transistor inputs at an input impedance, the input matching networks further comprising respective input matching capacitors attached to the pedestal. An RF output path electrically connected to the transistor outputs includes a passive combiner implemented in the printed circuit board and configured to combine component output signals received at the transistor outputs into a RF output signal.Type: ApplicationFiled: October 22, 2001Publication date: April 24, 2003Applicant: Telefonaktiebolaget LM EricssonInventors: Thomas W. Moller, Larry Leighton, Prasanth Perugupalli
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Publication number: 20030076174Abstract: In a radio frequency amplifier, a value of a matching device is changed in one matching circuit so as to constitute a matching circuit which realizes a load impedance optimized by a plurality of frequency bands, outputs, and signal modulation systems. When the matching device value is changed, a plurality of devices are connected onto the matching circuit via a micro mechanical switch. Alternatively, two points disposed apart from each other on a transmission line are connected using a micro mechanical switch. The micro mechanical switch is controlled to be on/off so that a device value or transmission line length is changed.Type: ApplicationFiled: October 18, 2002Publication date: April 24, 2003Inventors: Tomonori Tanoue, Kenji Sekine, Akira Kuriyama
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Publication number: 20030076175Abstract: A phase locked loop (10) for generating a variable output frequency signal. The phase locked loop (10) includes a controlled oscillator (14) to generate the variable output frequency signal in response to a tune signal. A phase detector (18) is activable in response to a gating signal (20) to generate an error signal representing a difference between a reference frequency signal and the variable output frequency signal. A loop filter (12) having a filter characteristic, filters the error signal and generates the tune signal. An offset cancellation circuit (22) is coupled to the loop filter (12). In response to an error signal representing phase offset of the phase locked loop (10), the offset cancellation circuit (22) supplies a compensating signal to reduce the phase offset.Type: ApplicationFiled: October 24, 2001Publication date: April 24, 2003Inventors: Gerald R. Fischer, Talley J. Allen, Ken K. Tsai
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Publication number: 20030076176Abstract: The present invention provides a phase locked loop (10) for generating a variable output frequency signal. The phase locked loop (10) includes a controlled oscillator (14) to generate the variable output frequency signal in response to a tune signal. A feedback frequency divider (16) coupled to the controlled oscillator (14) is operable to generate a divided frequency signal from the variable output frequency signal. A phase detector (18) generates an error signal representing a difference between a reference frequency signal and the divided frequency signal. A sample and hold circuit (22) is activable in response to a gating signal (20) derived from the reference frequency, to sample the error signal and generate a sampled signal. A loop filter (12) filters the sampled signal and generates the tune signal.Type: ApplicationFiled: October 24, 2001Publication date: April 24, 2003Inventor: Gerald R. Fischer
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Publication number: 20030076177Abstract: A phase locked loop (10) for generating an output frequency signal. The phase locked loop (10) includes a controlled oscillator (14) to generate the output frequency signal in response to a tune signal. A phase detector (18) generates an error signal representing a difference between a reference frequency signal and the output frequency signal. A loop filter (12) having a filter characteristic, filters the error signal and generates the tune signal. The loop filter (12) includes a bandwidth switching circuit (19) to vary the filter characteristics. A charge cancellation circuit (22) is coupled to the loop filter (12). In response to the error signal, the charge cancellation circuit (22) cancels errors associated with the bandwidth switching circuit.Type: ApplicationFiled: October 24, 2001Publication date: April 24, 2003Inventor: Gerald R. Fischer
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Publication number: 20030076178Abstract: An injection-locked high-frequency oscillator has an annular transmission line, and m (m>1) units of oscillating amplifiers, and is provided with an oscillation closed loop formed with the transmission line and the oscillating amplifiers, the oscillating frequency thereof being determined by an electric length of line of the oscillation closed loop. When n≧1 is defined, and when the wavelength corresponding to the oscillating frequency is defined as &lgr;, the electric line length from any one oscillating amplifier to the neighboring oscillating amplifier is set to be n&lgr; by taking delay time due to the oscillating amplifiers into consideration, and further into in-phase points on the oscillation closed loop, synchronizing signals having, respectively, a frequency that is 1/mn of the oscillating frequency are injected.Type: ApplicationFiled: October 18, 2002Publication date: April 24, 2003Inventors: Masayoshi Aikawa, Fumio Asamura, Takeo Oita
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Publication number: 20030076179Abstract: A low power and low jitter CMOS ring oscillator having a novel architecture that includes fully symmetrical differential current steering delay cells. This novel ring oscillator includes a first capacitor coupled between the first power supply rail and a bias voltage input. At least one stage couples across the first capacitor. Each stage includes a first transistor, a second capacitor, and a fully symmetrical differential delay cell. In an embodiment, the first transistor may be a PMOS transistor, where the drain of the first PMOS transistor connects to the first power supply rail and the gate of the first PMOS transistor couple to the bias voltage input. The second capacitor couples between the source of the first transistor and ground and acts as a low pass filter. As a result, the second capacitor minimizes the effects of the thermal and flicker noise of the devices which provide the tail current.Type: ApplicationFiled: August 7, 2002Publication date: April 24, 2003Inventors: Charles M. Branch, Lieyi Fang, Daramana Gata, James R. Hochschild
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Publication number: 20030076180Abstract: A phase-locked loop apparatus includes a ring oscillator including inverters, first and second transistors, a converter, mirror circuits. The first transistors control a current from a first voltage to the inverters. The second transistors control a current from the inverters. The converter converts the voltage output from the filter into a current. The first mirror circuit outputs a current in accordance with the current output from the converters. The second mirror circuit outputs a current according to the current output from the first mirror circuit to control the first transistors. The third mirror circuit outputs a current according to the current output from the second mirror circuit to control the second transistors. The converter, the first and second mirror circuits operate with a second voltage greater than the first voltage, and the ring oscillator and the third mirror circuit operate with the first voltage.Type: ApplicationFiled: August 28, 2002Publication date: April 24, 2003Applicant: Ricoh Company, LtdInventor: Hideaki Murakami
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Publication number: 20030076181Abstract: A time to digital converter (TDC) has a pair of digital oscillators. The periods of the oscillators differ by T&Dgr;. The oscillators are triggered by START and STOP pulses. A counter counts a number of pulses until reference points on the signals output by the oscillators coincide. Measurements may be made using a dual resolution method. Intrinsic jitter of the TDC can be determined by comparing sets of measurements in which the switch in resolutions is made at different points.Type: ApplicationFiled: September 16, 2002Publication date: April 24, 2003Inventors: Sassan Tabatabaei, Andre Ivanov
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Publication number: 20030076182Abstract: In a chattering eliminating apparatus, a coincidence circuit receives an input signal of the apparatus and an output signal of the apparatus to determine whether or not a level of the input signal of the apparatus is the same as a level of the output signal of the apparatus. An oscillation circuit carries out an oscillation operation only when the level of the input signal of the apparatus is not the same as the level of the output signal of the apparatus. A counter counts an output signal of the oscillation circuit, and is reset when the level of the input signal of the apparatus is the same as the level of the output signal of the apparatus. An output signal generating circuit inverts the level of the output signal of the apparatus when a counter value of the counter reaches a predetermined value.Type: ApplicationFiled: October 11, 2002Publication date: April 24, 2003Applicant: NEC CorporationInventor: Shunichi Seya
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Publication number: 20030076183Abstract: A method for dynamically varying a clock frequency in a processor. The method of one embodiment comprises driving a clock distribution network with a clock output from a phased locked loop (PLL). An adjustable clock generator is locked with the phased locked loop. The adjustable clock generator is substituted for the PLL on the clock distribution network.Type: ApplicationFiled: October 22, 2001Publication date: April 24, 2003Inventors: Simon M. Tam, Stefan Rusu
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Publication number: 20030076184Abstract: A PLL-controlled oscillator that can be suitably used for such purposes as a jitter filter in an optical transmission system includes an input voltage-switching control oscillator as a voltage-controlled oscillator (VCO). The input voltage-switching control oscillator includes: an oscillation closed loop that is provided with a variable-voltage capacitance element; and a switch for interchangeably selecting one of a plurality of voltages in accordance with a selection signal and applying the selected voltage as a control voltage to the variable-voltage capacitance element.Type: ApplicationFiled: October 23, 2002Publication date: April 24, 2003Inventor: Takeo Oita
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Publication number: 20030076185Abstract: A multielement oscillator employing a higher mode planar resonator being provided with the planar resonator and a plurality of oscillating elements. The planar resonator has a substrate, a resonation circuit conductor provided on a first principal plane of the substrate, a grounded circuit conductor provided on a second principal plane of the substrate, and being provided with a high-order resonance mode due to an electric field generating between paired plurality of positive and negative potential points and a magnetic field associated with the electric field. The oscillating elements are being connected, in at least one principal plane of the first and second principal planes of the substrate, to a plurality of identical potential points of the planar resonator as to provide connection between paired circuit conductor portions formed in the one principal plane.Type: ApplicationFiled: October 22, 2002Publication date: April 24, 2003Inventors: Masayoshi Aikawa, Fumio Asamura, Takeo Oita
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Publication number: 20030076186Abstract: An oscillation circuit uses a SAW oscillator and is able to control the oscillation frequency easily and correct the temperature characteristic of the oscillator so that an oscillation signal with high temperature stability can be generated. A clock signal CLK having a prescribed frequency difference from the ideal oscillation frequency is generated by the SAW oscillator 10. Register 30 is driven by a frequency-divided clock signal obtained by dividing the frequency of the clock signal at a predetermined frequency division rate. In-phase signal SI and quadrature signal SQ generated corresponding to the data Da that is incremented by a prescribed addition value F every period of the frequency-divided clock signal are output, and the clock signal is IQ-modulated on the basis of these signals. The frequency error of clock signal CLK can be corrected, and an output signal Sout having near ideal oscillation frequency can be obtained.Type: ApplicationFiled: September 26, 2002Publication date: April 24, 2003Inventor: Kouzou Ichimaru
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Publication number: 20030076187Abstract: In a dynamics compressor, an analog signal to be compressed is supplied to a first amplifier stage as an input signal, and the output signal thereof is supplied to the next amplifier stage as an input signal, and so on for a number of successive amplifier stages. Each amplifier stage amplifies its input signal with a stage amplification until it reaches a stage limit level. The analog signal and the respective output signals of the amplifier stages are summed in a summation stage to form a sum signal. Above a minimal level, the magnitude of the curve of the sum signal roughly corresponds to an exponent characteristic of the magnitude of the analog signal.Type: ApplicationFiled: October 1, 2002Publication date: April 24, 2003Inventors: Ralph Oppelt, Markus Vester
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Publication number: 20030076188Abstract: Disclosed are planar structures for coupling electromagnetic signals between planar transmission lines and waveguides. A preferred exemplary structure comprises a shielded patch antenna and one or more capacitive diaphragms disposed adjacent to the patch antenna. This structure is advantageous to MMIC modules in connecting from a planar transmission line of a substrate carrying an MMIC to an external waveguide without the need of a non-planar back metal short, which is normally essential to avoid back scattering from waveguide and also normally needed to achieve impedance matching. In structures according to the present invention, a patch antenna radiates into the waveguide while the antenna's ground plane reduces back scattering from waveguide. The one or more capacitive diaphragms provide impedance matching between the microstrip and the waveguide.Type: ApplicationFiled: October 11, 2001Publication date: April 24, 2003Inventors: Debasis Dawn, Edmar Camargo, Yoji Ohashi
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Publication number: 20030076189Abstract: A stipline coupling includes a balun-configured stripline, and a transformer-configured stripline coupled to the balun-configured stripline. The balun-configured stripline includes a pair of conductors, one of which includes a pair of coplanar conductive paths. One of the conductive paths is grounded to provide equal magnitude opposite phase signals to the transformer-configured stripline. The transformer-configured stripline impedance matches the opposite phase signals to the balanced transmission line. The transformer-configured stripline includes two conductive trace sections, one of which includes a pair of substantially abutting non-contacting conductive trace portions. The conductive trace portions of the one trace section includes fingers extending from the respective trace portion. The fingers of one of the fingered traces are interlaced with the fingers of the other fingered traces.Type: ApplicationFiled: October 7, 2002Publication date: April 24, 2003Inventor: Calin Moldoveanu
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Publication number: 20030076190Abstract: Switching apparatus and method in an array having plural inputs and plural outputs crossing each other at a plurality of crosspoints. First and second tandem switches are disposed at each crosspoint, between a respective input and a respective output. A shunt capacitor is coupled to each first and second switch and to ground, to short crosstalk in the inputs and outputs. A method of making a semiconductor switch array is also provided.Type: ApplicationFiled: November 27, 2001Publication date: April 24, 2003Inventors: William L. Clarke, Jules D. Levine, Stan Freske
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Publication number: 20030076191Abstract: A directional coupling device includes a main line and a sub line, and line coupling (distributed constant coupling) is effected between the main line and the sub line, each of which has a portion that is arranged substantially parallel to each other and alongside each other. The sub line is longer than the main line. The main line is a substantially straight line or a substantially straight line bending at a predetermined position, i.e., a non-spiraling line, and the sub line is arranged to circle in a spiral manner by bending a substantially straight line at predetermined positions. Thus, a small high-capability directional coupler has excellent isolation properties and directivity, and little insertion loss or deterioration in reflection properties.Type: ApplicationFiled: October 16, 2002Publication date: April 24, 2003Applicant: Murata Manufacturing Co., Ltd.Inventors: Naoki Iida, Masahiko Kawaguchi
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Publication number: 20030076192Abstract: The present invention discloses a system for integrating a quasi-optical reflection-mode array into a wave-guiding enclosure. The system includes a quasi-optical reflection mode array and a waveguide assembly that encloses and mounts therein the array. In one preferred embodiment, the waveguide assembly includes an array mounting section into which the array is mounted, a first energy coupling section, a second energy coupling section and a three-port waveguide section. The wave-guiding section has a first port connected to the first energy coupling section, a second port connected to the second energy coupling section, and a third port connected to the array mounting section.Type: ApplicationFiled: October 23, 2001Publication date: April 24, 2003Inventors: Michael P. DeLisio, Blythe C. Deckman, James J. Rosenberg
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Publication number: 20030076193Abstract: A multi-channel feed network includes a main waveguide section (either square or circular) for connection to a satellite antenna for propagating two orthogonal polarizations. The feed network further includes a low pass section connected on axis with the main waveguide, the low pass section having the same cross section as the main waveguide, and a high pass section also connected perpendicular to the main waveguide. The low pass section includes a band reject filter (BRF) formed from slots cut to reject higher frequency signals. The high pass section can be a rectangular waveguide which functions to filter low frequency signals. The feed network can be configured to support a number of different polarizations. Orthogonal linear polarizations are provided for the high frequency bands by adding additional high pass sections connected by power dividers, and for the low frequency bands by adding a conventional OMT.Type: ApplicationFiled: October 22, 2001Publication date: April 24, 2003Inventors: Ming Hui Chen, Rong-Chan Hsieh, Wei-Tse Cheng
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Publication number: 20030076194Abstract: In a duplexer for a wireless communication system that comprises a transmission and a reception band, it is proposed that a split surface wave filter be provided as input and/or output filter, said slit surface wave filter being composed of at least two sub-filters that cover neighboring frequency sub-ranges of the corresponding band and supplementing one another to the overall band. At least two pairs of sub-filters are provided that respectively comprise a filter in the input and out put filter. Switching between the at least two pairs can be carried out with a switch. Given the same duplexer spacing, a higher band spacing that can be realized with SAW filters is created between transmission and reception band or, respectively, the corresponding frequency sub-ranges.Type: ApplicationFiled: September 16, 2002Publication date: April 24, 2003Inventor: Jurgen Machui
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Publication number: 20030076195Abstract: A composite filter hasType: ApplicationFiled: October 1, 2002Publication date: April 24, 2003Inventors: Toshi Ishizaki, Hiroyuki Nakamura
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Publication number: 20030076196Abstract: A dielectric duplexer includes a substantially-rectangular-parallelepiped-shaped dielectric block. The interior of the dielectric block includes inner-conductor-formed holes containing inner conductors. An outer conductor is formed on the substantial entirety of an exterior surface of the dielectric block. Input/output electrodes and antenna input/output electrodes are formed at predetermined positions. Thus, the dielectric block is provided with a band eliminate filter and a band pass filter. A C-L-C &pgr;/2 phase circuit in which C, L, and C are arranged in the shape of the letter &pgr; is provided between an antenna and the antenna input/output electrode of the band eliminate filter, and the antenna is connected to the antenna input/output electrode of the band pass filter.Type: ApplicationFiled: October 22, 2002Publication date: April 24, 2003Inventors: Soichi Nakamura, Hirofumi Miyamoto
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Publication number: 20030076197Abstract: A method for achieving a desired value of electrical impedance between conductors of an electrical power distribution structure by electrically coupling multiple bypass capacitors and corresponding electrical resistance elements in series between the conductors. The resistance elements may be annular resistors, and may provide the designer a greater degree of control of the system ESR. The annular resistors may comprise a first terminal, an annular resistor, and a second terminal. The second terminal may be located within the confines of the annular resistor. The annular resistors may be printed onto a conductive plane (e.g. a power plane or a ground plane), or may be a discrete component.Type: ApplicationFiled: October 24, 2001Publication date: April 24, 2003Inventors: Istvan Novak, Valerie St.Cyr, Michael C. Freda, Merle Tetreault
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Publication number: 20030076198Abstract: A phase shifter adjusts the phase between two segments of an RF feed line that are fed with the phase shifter. Specifically, the phase shifter adjusts the phase between two signals in RF feed line segments by changing the electrical path lengths that RF energy travels down in each respective RF feed line. The phase shifter includes a coupling arm, a key, a spring, and a support architecture that fastens the phase shifter to a substantially planar surface. The support architecture is rotated manually or with a machine such as a motor. The coupling arm can include a coupling ring, a wiper element, a support trace, and a dielectric spacer. The phase shifting system is a relatively compact structure having a predetermined value of capacitance maintained between a coupling ring disposed on the coupling arm and a coupling ring disposed on a planar surface.Type: ApplicationFiled: August 23, 2002Publication date: April 24, 2003Applicant: EMS Technologies, Inc.Inventors: Sara Phillips, Jacob Alaburda, Douglas E. Dawson
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Publication number: 20030076199Abstract: An LC high-pass filter circuit device includes an inductor defined by via holes formed in adjacent insulating sheets which are connected in the direction of stacking of the sheets so as to define a single trap inductor. Inductor via holes formed in another insulating sheet define separate high-pass filter inductors. The trap inductor and the high-pass filter inductors have axes which extend substantially perpendicularly to the planes of the insulating sheets. Each of the high-pass circuit inductors defines, in combination with a high-pass filter capacitor, a high-pass filter circuit, while the trap inductor defines, in combination with a capacitor, a trap circuit. The high-pass filter circuits and the trap circuit in combination define a small-sized LC high-pass filter circuit device which exhibits high Q value and which excels in frequency characteristics, as well as a laminated LC high-pass filter device, a multiplexer and a radio communication apparatus incorporating the LC high-pass filter circuit device.Type: ApplicationFiled: October 16, 2002Publication date: April 24, 2003Applicant: Murata Manufacturing Co., Ltd.Inventor: Naoto Yamaguchi
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Publication number: 20030076200Abstract: A filter includes an electromagnetic wave supporting structure having a cavity defined by an encircling sidewall, and microwave feeds coupled to the cavity for inputting and for outputting electromagnetic power to and from the wave supporting structure. At least a portion of an interior surface of the sidewall has a succession of corrugations. Successive ones of the corrugations are spaced apart by a distance less than approximately 0.2 wavelength of the electromagnetic wave, and each of the corrugations has a height greater than the spacing distance but less than approximately 0.5 wavelength of the electromagnetic wave. The geometry of the corrugated sidewall reduces interaction between the electromagnetic wave and the sidewall to inhibit dissipation of power of the electromagnetic wave within the sidewall.Type: ApplicationFiled: October 18, 2001Publication date: April 24, 2003Inventors: Slawomir J. Fiedziuszko, Torsten Schnabel
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Publication number: 20030076201Abstract: A dual-mode band-pass filter having a greatly reduced size and a high design flexibility, includes a frame-shaped electrode pattern disposed on one surface or inside a dielectric substrate. A pair of input-output circuits are coupled to the frame-shaped electrode pattern. The plane shape and the line-width of the frame-shaped electrode pattern are configured so that two generated resonance modes are coupled to each other.Type: ApplicationFiled: September 27, 2002Publication date: April 24, 2003Applicant: Murata Manufacturing Co., Ltd.Inventors: Naoki Mizoguchi, Hisatake Okamura, Seiji Kamba
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Publication number: 20030076202Abstract: The invention relates to a magnetically influenced current or voltage regulator comprising a body (1) which is composed of a magnetisable material and provides a closed, magnetic circuit, at least one first electrical conductor (8) wound about the body of a first main winding (2) and at least one second electrical conductor (9) wound about the body of a second main winding (4). The winding axis (A2) for the main winding (2) is at right angles to the winding axis (A4) for the control winding (4) with the object of providing orthogonal magnetic fields (H1, B1 and H2, B2 respectively) in the body (1) and thereby controlling the behaviour of the magnetisable material relative to the field (H1, B1) in the main winding (2) by means of the field (H2, B2) in the control winding (4).Type: ApplicationFiled: October 24, 2002Publication date: April 24, 2003Inventors: Espen Haugs, Frank Strand
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Publication number: 20030076203Abstract: In one aspect, a contact block for use with an electrical relay includes a grippable portion and a plurality of blocking portions extending from the grippable portion. The plurality of blocking portions are oriented in a parallel relationship relative to each other. The grippable portion and the plurality of blocking portions are substantially coplanar. In another aspect, a control system includes an electrical relay having a base, a contact arrangement supported on the base and a cover moveable between at least a first position, wherein the cover is releasably secured to the base over the contact arrangement, and a second position wherein the cover is disengaged from the base with the contact arrangement exposed to the user. The system further includes a contact block having a primary blocking portion and a secondary blocking portion.Type: ApplicationFiled: October 22, 2001Publication date: April 24, 2003Inventor: Craig E. Brooks
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Publication number: 20030076204Abstract: A removable quick connect terminal for an electric power switch has a molded housing with an open cavity and an electrically conductive terminal member with a plurality of male terminations that project through slots in a cavity wall in the housing into the open cavity. The terminal member has a tang projecting outward from the housing that is clamped by a conventional collar terminal to a power conductor of the switch projecting into an external terminal recess in the molded switch casing. The terminal member is secured to the molded housing by a pair of oppositely facing chamfered catches engaging an opening in the flat center section of the terminal member. The molded housing of the quick connect terminal has hooks which engage abutment surfaces on the switch casing and a pair of integral compliant latches which engage latch ledges in the external terminal recess to removably secure the housing to the switch casing.Type: ApplicationFiled: October 19, 2001Publication date: April 24, 2003Inventors: Michael Jerome Whipple, Edward Ethber Lias
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Publication number: 20030076205Abstract: A vertically-aligned open MRI magnet system includes first and second (i.e., top and bottom) assemblies each having a longitudinally-extending and vertically-aligned axis, a superconductive main coil, and a vacuum enclosure enclosing the main coil. At least one support beam has a first end attached to the first assembly and has a second end attached to the second assembly. A vibration isolation system supports the magnet system.Type: ApplicationFiled: September 13, 2001Publication date: April 24, 2003Inventors: Yu Wang, Evangelos Trifon Laskaris, Richard Andrew Ranze
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Publication number: 20030076206Abstract: A Neodymium-Iron-Boron permanent magnet which is substantially wider across a first axis than across the perpendicular second axis. The second axis is the axis defining the north and south poles of the magnet. At one of the poles is a permalloy cap which is substantially parallel to the first axis and inhibits the extension of magnetic flux from that pole and encourages instead a deep extension of the magnetic flux from the other pole. An aperture penetrates the magnet through the second axis which is wider at the pole away from the permalloy cap than it is at the pole adjacent to the permalloy cap. The shape of this aperture causes a distortion of the deeply extending magnetic flux lines at the pole away from the permalloy cap to be pinched inward toward the second axis rather than being parallel to it.Type: ApplicationFiled: September 18, 2002Publication date: April 24, 2003Inventors: Yong Lee, Joseph Lee
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Publication number: 20030076207Abstract: A microwave inductor including a coil with windings tapered from a first end of the coil to a second end of the coil to reduce resonant loss glitches found in conventional inductors which have uniform diameter windings. The coil further includes a core composed of a dielectric material containing a colloidal suspension of magnetic particles, the magnetic material preferably being iron powder and the dielectric preferably being epoxy, making the core a poly-iron material. The magnetic particles being colloidally suspended in dielectric increase the impedance of the coil at high frequencies to reduce resonant glitches without lowering the low frequency Q of the inductor. As such, a single coil can be utilized both in a filter which requires a low impedance at low frequencies to create a high Q, and as a bias line which operates at frequencies well beyond the resonant frequency of the inductor since a high impedance is provided by the core at higher resonant frequencies.Type: ApplicationFiled: November 20, 2002Publication date: April 24, 2003Applicant: Anritsu CompanyInventor: William W. Oldfield