Rc Or Rl Type Patents (Class 333/172)
  • Publication number: 20130069741
    Abstract: Disclosed is a noise reducer that ameliorates electromagnetic noise interference. Specifically disclosed is a noise reducer that ameliorates electromagnetic noise interference for electronic equipment caused by noise superimposed on a conductor wire. The conductor wire includes a magnetic cylindrical core that penetrates a hollow hole, a winding coiled around the magnetic cylindrical core, and an impedance element connected to the winding. When a noise current is superimposed on the conductor wire that has been made to penetrate the magnetic cylindrical core, part of the noise current is electromagnetically induced from the conductor wire to the winding and flows to the winding. The noise current that flows to the winding is transformed into heat and consumed by the impedance element. As a result, the noise power that gives electromagnetic noise interference to the electronic devices can be reduced and the electromagnetic noise interference for the electronic devices ameliorated.
    Type: Application
    Filed: April 26, 2011
    Publication date: March 21, 2013
    Inventor: Takashige Terakawa
  • Patent number: 8395461
    Abstract: Various embodiments include apparatus, systems, and methods having a conductive contact configured to couple to a resistor-capacitor (RC) network, a device unit coupled to the conductive contact, and a mode switching unit to change a characteristic of a signal at the conductive contact based at least in part on an RC time constant of the RC network. The mode switching unit may switch the device unit between a first operating mode and a second operating mode based on a signal level of the signal.
    Type: Grant
    Filed: October 31, 2011
    Date of Patent: March 12, 2013
    Assignee: Atmel Corporation
    Inventor: Marvin L. Kausch
  • Publication number: 20130049884
    Abstract: Low-frequency digital data input signals in an integrated circuit are controlled between first and second stages in a signal input path of the integrated circuit by a capacitance in the signal input path between the first and second stages. The capacitance is sized to attenuate high-frequency noise in the signal input path. In one embodiment, the integrated circuit may be an input buffer circuit in which the capacitance is a capacitor between the signal input path and a reference potential, a voltage source, or both. In another embodiment, the integrated circuit may be an oscillator circuit in which the capacitance is provided between corresponding elements of a differential pair of transistors in the first stage.
    Type: Application
    Filed: August 22, 2011
    Publication date: February 28, 2013
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Kevin Patrick Lavery, Pravin P. Patel
  • Patent number: 8340616
    Abstract: A tuner uses a bank of tracking filters to preselect a channel to be received. Each tracking filter covers a range of frequencies. The tracking filters are tunable in frequency using switched capacitors and are tunable in gain by using switched resistors. The switched resistors can be controlled by an automatic gain control circuit that monitors the selected signal and adjust the tracking filter gain to achieve a desired signal level. A switch directs the received signal or signal from a test tone generator into the tracking filters. The test tone, generated by a frequency agile circuit, can be used to calibrate the filters, both in frequency and gain.
    Type: Grant
    Filed: December 14, 2005
    Date of Patent: December 25, 2012
    Assignee: Entropic Communications, Inc.
    Inventors: Peter Jivan Shah, YongSik Youn, Martin Christopher Alderton
  • Publication number: 20120249257
    Abstract: In a vehicle network for controlling electronic devices of the type having a network driver with at least one output line connected to the network through a common mode choke. A circuit for improving the immunity of the network includes a resistor and a capacitor connected in series between the signal output line and ground. The series resistor and capacitor protect the network from communication errors.
    Type: Application
    Filed: March 30, 2011
    Publication date: October 4, 2012
    Applicant: Hitachi, Ltd.
    Inventors: Masayoshi Takahashi, Hua Zeng
  • Patent number: 8264301
    Abstract: There are provided a modeling circuit of a high-frequency device capable of providing a more accurate modeling circuit having a higher-order resonance by dividedly modeling an overlap zone and a non-overlap zone of the high-frequency device, and a modeling method thereof.
    Type: Grant
    Filed: August 20, 2009
    Date of Patent: September 11, 2012
    Assignees: Samsung Electro-Mechanics Co., Ltd., Industry-University Cooperation Foundation Hanyang University
    Inventors: Ill Kyoo Park, Chan Seo Park, Myoung Gyun Kim, Tae Yeoul Yun, Zhe Jun Jin, Hyuk Sun, Young Duk Yoo
  • Patent number: 8253512
    Abstract: A low pass filter circuit includes an inductor and a capacitor. A first terminal of the inductor functions as an input to receive direct current voltage, and a second terminal of the inductor is connected to a first terminal of the capacitor through first and second conductor traces connected in series. A second terminal of the capacitor is grounded. Widths of the first and second conductor traces both range from about 2 mils to about 5 mils. A node between the first and second conductor traces outputs the direct current.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: August 28, 2012
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventor: Guang-Feng Ou
  • Patent number: 8237519
    Abstract: Filter design techniques and filters based on metamaterial structures including an extended composite left and right handed (E-CRLH) metamaterial unit cell.
    Type: Grant
    Filed: November 17, 2008
    Date of Patent: August 7, 2012
    Assignee: Rayspan Corporation
    Inventor: Maha Achour
  • Patent number: 8225113
    Abstract: A computer system includes a north bridge chip, a power source, and a resistor-capacitor filter circuit coupled between the power source and the north bridge chip. The north bridge chip has a digital-to-analog converter analog power pin and a digital-to-analog converter analog ground pin. The power source is coupled to the digital-to-analog converter analog power pin of the north bridge chip. The resistor-capacitor filter includes a first resistor and a first capacitor. The first resistor is connected between the power source and the digital-to-analog converter analog power pin of the north bridge chip. One end of the first capacitor is connected to the digital-to-analog converter analog power pin of the north bridge chip, and another end of the first capacitor is connected to ground together with the digital-to-analog converter analog ground pin of the north bridge chip.
    Type: Grant
    Filed: October 14, 2009
    Date of Patent: July 17, 2012
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventor: Ke-You Hu
  • Patent number: 8159312
    Abstract: A method and class of circuit configurations for coupling low-frequency signals from one stage of an electronic apparatus to another stage, from the outside world to such a stage, or from such a stage to the outside world, through the use of a plurality of symmetrical double-layer capacitors combined with other electronic components are disclosed. The capacitors are used for signal transmission while blocking direct current, rather than for energy storage. Use of double-layer capacitors in place of more conventional capacitors permits the transmission of a much wider range of signals with far less distortion. The technology is particularly well-adapted to use in medical devices, including bioelectronic stimulators, where redundant devices are required for safety in case of single component failure while unacceptable levels of distortion may occur when conventional components are used.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: April 17, 2012
    Assignee: MedRelief Inc.
    Inventor: James W. Kronberg
  • Patent number: 8154362
    Abstract: A method and apparatus to provide a bi-directional constant impedance filter. Embodiments include electric networks which give filter responses while presenting a constant impedance to a signal received at either an input or an output port for a plurality of frequencies.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: April 10, 2012
    Assignee: 2Wire, Inc.
    Inventor: Curtis M. Allen
  • Publication number: 20120081328
    Abstract: The invention provides an electrode arrangement for a capacitive sensor device and for a capacitive sensor, respectively, for detecting a position and/or an approach of an object, which comprises a sensor electrode and a first shield electrode, wherein the sensor electrode is arranged on a first side of a substantially flat substrate with a first side and a second side, and wherein the first shield electrode is arranged on the second side of the substrate and serves for shielding the alternating electric field emitted by the sensor electrode from ground. There is also provided a foil with an electrode arrangement according to the invention as well as a method for the production of a display arrangement with an electrode arrangement according to the invention.
    Type: Application
    Filed: June 15, 2010
    Publication date: April 5, 2012
    Inventors: Thomas Kandziora, Peter Fasshauer
  • Patent number: 8144480
    Abstract: A multi-layer imbedded capacitance and resistance substrate core. At least one layer of resistance material is provided. The layer of resistance material has a layer of electrically conductive material embedded therein. At least one layer of capacitance material of high dielectric constant is disposed on the layer of resistance material. Thru-holes are formed by laser.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: March 27, 2012
    Assignee: Endicott Interconnect Technologies, Inc.
    Inventors: Rabindra N. Das, John M. Lauffer, Irving Memis, Steven G. Rosser
  • Patent number: 8134423
    Abstract: A ladder LPF includes a first capacitor formed of a transistor in which two terminals out of three are diode-connected, and a second capacitor formed by connecting a pn junction capacitor and an insulating capacitor in parallel. In the second capacitor, the pn junction capacitor formed in a semiconductor layer and the insulating capacitor formed in a surface of the semiconductor layer are connected to each other in parallel so as to almost overlap each other. Accordingly, the area in the LPF occupied by the second capacitor can be prevented from increasing even when its capacitance value is increased. Moreover, having the snap-back characteristics, the first capacitor can protect the second capacitor having the insulating capacitor from ESD. As a result, what can be obtained is a compact noise filter having high RFI removal characteristics and accomplishing high resistance to ESD.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: March 13, 2012
    Assignees: SANYO Semiconductor Co., Ltd., Semiconductor Components Industries, LLC
    Inventor: Eio Onodera
  • Patent number: 8115571
    Abstract: A Passive harmonic filter (F) has an input node (B) for connection to a power supply (1), an output node (C) for connection to a load (15, 17) and an intermediate node (A). A first branch (3, 4) located between the input node (B) and the intermediate node (A) has at least one first inductance (4). A second branch (11, 13) located between the intermediate node (A) and the output node (C) has at least one second inductance (11). A third branch (5, 7, 9) is connected to the intermediate node (A) and has at least one capacitor (9). The first, second and third branch thus build a low-pass T-filter. A damping branch (22, 24) is provided having at least one first resistor (22), where the damping branch is arranged in parallel to the first branch.
    Type: Grant
    Filed: November 28, 2008
    Date of Patent: February 14, 2012
    Assignee: Schaffner EMV AG
    Inventors: Andrzej Pietkiewicz, Fabian Beck
  • Publication number: 20120032757
    Abstract: A multilayer component includes a dielectric ceramic material that can be co-sintered with a varistor ceramic to form a monolithic multilayer component according to the invention. The multilayer component therefore includes a layer of a varistor ceramic and another layer of a dielectric. Both layers can be arranged directly adjacent to one another in the multilayer component. In the multilayer component, metallizations are arranged on or between the ceramic layers. The metallizations are structured to form conductor sections and metallized areas. The metallizations form together with the ceramic layers alongside a varistor at least one further component selected from at least one of the component functions.
    Type: Application
    Filed: February 8, 2010
    Publication date: February 9, 2012
    Applicant: EPCOS AG
    Inventors: Pavol Dudesek, Guenter Pudmich, Hannes Schiechl, Edmund Payr, Thomas Feichtinger, Werner Salz, Christian Hoffmann
  • Publication number: 20120019331
    Abstract: A printed circuit board includes signal transmitting units that transmit signals, signal receiving units that receive signals, and a plurality of signal lines that connect the signal transmitting units and the signal receiving units. A resistor having a value Rp [?] of resistance with a first tolerance is provided between two signal lines that are adjacent to each other. In addition, a capacitor element that is connected in series to the resistor and that has a value Cp [F] of capacitance with a second tolerance is also connected between the two signal lines. In relation to the rise time tr [s] of the signals output from the signal transmitting units, the value Rp of resistance of the resistor and the value Cp of capacitance of the capacitor element are set such that an expression (Cp×Rp)×0.9 tr/3?(Cp×Rp)×1.1 is satisfied.
    Type: Application
    Filed: July 19, 2011
    Publication date: January 26, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Shoji Matsumoto
  • Patent number: 8085100
    Abstract: A frequency synthesis/multiplication circuit and method for multiplying the frequency of a reference signal. In one embodiment, multiple versions of the reference signal are generated having different phases relative to one another, and these multiple versions are combined to form an output signal having a frequency that is a multiple of the frequency of the reference signal.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: December 27, 2011
    Assignee: Cypress Semiconductor Corporation
    Inventor: Aaron Brennan
  • Publication number: 20110279175
    Abstract: An RC filter is calibrated to a desired cutoff frequency by initializing the filter with a cutoff frequency. An input signal is filtered by the RC filter to provide a filter output signal having phase and frequency values. The cutoff frequency of the RC filter is adjusted based on the phase and frequency values of the filter output signal if the phase and frequency values do not satisfy a predetermined condition. The filtering and adjusting are repeated until the phase and frequency values of the filter output signal satisfy the predetermined condition. A calibration apparatus has a frequency generator, a resistor-capacitor (RC) filter, a phase comparator, a frequency detector, and a state machine. The phase comparator, frequency detector, and state machine are configured to calibrate the RC filter to a cutoff frequency specified by the reference signal based on a filter output signal of the RC filter.
    Type: Application
    Filed: May 11, 2010
    Publication date: November 17, 2011
    Applicant: TAIWAN SEMICONDUCTOR MANUFACTURING CO., LTD.
    Inventors: Feng Wei KUO, Tsung-Hsien TSAI, Jia-Liang CHEN
  • Patent number: 8058949
    Abstract: In varying embodiments, the present inventive concepts relate to a notch filter for quadrature and differential signaling. No inductor is used in this notch filter, thus the integrated circuits silicon die area is small. In addition, the linearity of the notch filter is excellent because of the linearity of the resistors and capacitors in integrated circuits.
    Type: Grant
    Filed: April 27, 2009
    Date of Patent: November 15, 2011
    Assignee: Mediatek Inc.
    Inventor: Jenwei Ko
  • Patent number: 8054144
    Abstract: Various embodiments include apparatus, systems, and methods having a conductive contact configured to couple to a resistor-capacitor (RC) network, a device unit coupled to the conductive contact, and a mode switching unit to change a characteristic of a signal at the conductive contact based at least in part on an RC time constant of the RC network. The mode switching unit may switch the device unit between a first operating mode and a second operating mode based on a signal level of the signal.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: November 8, 2011
    Assignee: Atmel Corporation
    Inventor: Marvin L. Kausch
  • Patent number: 8022575
    Abstract: Exemplary embodiments of the present disclosure provide a method and controller for damping multimode electromagnetic oscillations in electric power systems which interconnect a plurality of generators and consumers. The controller for damping such oscillations includes a phasor measurement unit (PMU) and a power oscillation damper (POD) controller. Each oscillating mode signal is damped and then superposed to derive a control signal. A feedback controller is used to feedback the control signal to a power flow control device in the power system.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: September 20, 2011
    Assignee: ABB Research Ltd
    Inventors: Petr Korba, Mats Larsson
  • Patent number: 8018300
    Abstract: A band rejection filter capable of reducing harmonics includes a first signal end, a second signal end, a high pass filter coupled between the first signal end and the second signal end for performing high pass filtering on signals transmitted between the first signal end and the second signal end, and a low pass filter coupled between the first signal end and the second signal end for performing low pass filtering on signals transmitted between the first signal end and the second signal end. The low pass filter includes a plurality of non-magnetic-core inductors coupled in a sequence between the first signal end and the second signal end, and a plurality of capacitors respectively coupled between an intersection of adjacent non-magnetic-core inductors of the plurality of non-magnetic-core inductors and a ground end.
    Type: Grant
    Filed: May 14, 2009
    Date of Patent: September 13, 2011
    Assignee: Wistron NeWeb Corporation
    Inventors: Tzong-Jyh Chen, Chien-Heng Wu
  • Patent number: 8013684
    Abstract: In an integrated circuit having a number of circuit units on a single semiconductor chip, particularly in a system-on-chip integrated circuit including an integrated transceiver, interference between the circuit units is suppressed using on-chip resonant elements. Each resonant element has at least one on-chip capacitor and at least one on-chip conductive line constituting an inductance. The capacitance-inductance combinations are arranged to be resonant at one or more frequencies at which radio frequency energy is generated by the circuit units. The capacitive part of each series resonant combination is formed as a plurality of capacitor elements forming in an array to minimise self-inductance. Also disclosed is a filtering arrangement in which each circuit unit is individually supplied from the tap of a series resistive-capacitance combination to provide low-pass filtering.
    Type: Grant
    Filed: September 4, 2008
    Date of Patent: September 6, 2011
    Assignee: ST-Ericsson SA
    Inventors: Matteo Conta, Andrea Baschirotto
  • Publication number: 20110202315
    Abstract: A signal processor for removing at least one unintended signal component from an input signal (ua) is proposed. The signal processor includes a filter device (130) and a processing device (150). The filter device (130) filters the input signal (uâ) and generates a filtered signal (uf), which includes the unintended signal component to be removed. The processing device (150) generates an output signal (um), which indicates a deviation of the input signal (ua) from the filtered input signal (uf). By detecting the unintended signal component first an removing this component from the input signal (uâ), the input signal will not be manipulated directly but the unintended signal component in the input signal (uâ) will be compensated. This allows to remove the unintended component from the input signal (uâ) with less distortions of the interesting components in the input signal (uâ).
    Type: Application
    Filed: August 21, 2009
    Publication date: August 18, 2011
    Applicant: NXP B.V.
    Inventors: Boris Klabunde, Stefan Butzmann
  • Publication number: 20110193653
    Abstract: A low pass filter circuit includes an inductor and a capacitor. A first terminal of the inductor functions as an input to receive direct current voltage, and a second terminal of the inductor is connected to a first terminal of the capacitor through first and second conductor traces connected in series. A second terminal of the capacitor is grounded. Widths of the first and second conductor traces both range from about 2 mils to about 5 mils. A node between the first and second conductor traces outputs the direct current.
    Type: Application
    Filed: May 18, 2010
    Publication date: August 11, 2011
    Applicants: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD, HON HAI PRECISION INDUSTRY CO., LTD.
    Inventor: GUANG-FENG OU
  • Patent number: 7994876
    Abstract: A low pass filter includes a differential mode filter and a common mode filter. The common mode portion of the filter includes at least one inductor and one capacitor, as well as a damping circuit with at least one capacitor. The low pass filter has a reduced weight, which is useful in circumstances in which weight is a significant factor, such as in aircraft.
    Type: Grant
    Filed: July 23, 2008
    Date of Patent: August 9, 2011
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Frank Z. Feng, Dwight D. Schmitt, Donal E. Baker, John Huss, Curtis B. White, Jamal Shafii, Mark F. Stunkel
  • Publication number: 20110156839
    Abstract: A system and method for configuring a variable filter in a capacitive sensing circuit are provided. In one example, the circuit includes first and second circuitry and control logic. The first circuitry is configured to provide a variable resistance path that is coupled to an external capacitor that is to be sensed by the capacitive sensing circuit. The second circuitry controls actuation of the first circuitry and is responsive to a voltage change that occurs when a charge level of the external capacitor is altered. The second circuitry actuates the first circuitry when the voltage change causes a voltage supplied to the second circuitry to pass a predefined threshold. The control logic receives input identifying a desired corner frequency, determines a resistance setting for the first circuitry corresponding to the corner frequency, and applies the resistance setting to the first circuitry to configure the first circuitry at the corner frequency.
    Type: Application
    Filed: December 31, 2009
    Publication date: June 30, 2011
    Applicant: SILICON LABORATORIES INC.
    Inventors: BRADLEY MARTIN, DAZHI WEI
  • Patent number: 7961065
    Abstract: The invention can provide a miniaturized noise filter. The noise filter for reducing noise comprises a coil with a conductive wire (2) wound around a core (1); a case (6) formed of an insulating material receiving the coil; a bracket (8) of a magnetic material forming a flux path of magnetic flux generated from the coil, which places the case thereon, which has a pair of end plates (12a, 12b) disposed opposite to both ends of the core of the coil respectively through a gap of a predetermined distance, and which has a bottom plate (8a) disposed between the pair of the end plates; and an input/output terminal (3a, 3b) for the coil.
    Type: Grant
    Filed: August 11, 2006
    Date of Patent: June 14, 2011
    Assignees: Harada Industry Co., Ltd., Toyota Jidosha Kabushiki Kaisha
    Inventors: Hidekazu Kobayashi, Yasuhiko Nishioka, Minoru Sasaki, Seigen Maeno
  • Publication number: 20110092169
    Abstract: An LR polyphase filter implemented with inductors and resistors and capable of operating at high frequencies is described. In one design, the LR polyphase filter includes first and second paths, with each path including an inductor coupled to a resistor. The first and second paths receive a first input signal and provide first and second output signals, respectively, which may be in quadrature. For a differential design, the polyphase filter further includes third and fourth paths, which receive a second input signal and provide third and fourth output signals, respectively. The four output signals may be 90° out of phase. The first and second input signals are for a differential input signal. The first and third output signals are for a first differential output signal, and the second and fourth output signals are for a second differential output signal. Each inductor may be implemented with a transmission line.
    Type: Application
    Filed: October 19, 2009
    Publication date: April 21, 2011
    Applicant: QUALCOMM Incorporated
    Inventor: Jafar Savoj
  • Publication number: 20110054651
    Abstract: An audio input unit, includes an audio capturing unit, a first coupling circuit, a signal filtering circuit, a second coupling circuit, a converting circuit and a codec which are connected in series in that order. The first coupling circuit is used for filtering the direct-current signal, the signal filtering circuit is used for filtering noise from the electrical signal, and the second coupling circuit is used for further filtering the direct-current signal. The converting circuit includes an input port, a first output port and a second output port, when the input port receives the filtered signal, the first output port outputs a signal with the same phase as the filtered signal, the second output port outputs a signal with the reverse phase as the filtered signal, the two output signals have the opposite phase and the same amplitude.
    Type: Application
    Filed: April 27, 2010
    Publication date: March 3, 2011
    Applicants: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD, HON HAI PRECISION INDUSTRY CO., LTD.
    Inventors: LIN-KUN DING, JIANG-FENG SHAN, REN-WEN HUANG, TSUNG-JEN CHUANG, SHIH-FANG WONG
  • Patent number: 7889020
    Abstract: Disclosed is methodology and apparatus for producing an asymmetrical filter for use with implantable medical devices, and in other input filtering environments. Differing forward and reverse characteristic responses are provided by inserting a low value resistor in series with heart connecting leads so that EMI input protection may be provided without significantly reducing energy transfer from the protected device. Improved protection against voltage transients is provided with present arrangements of differentiated series impedance. Higher frequency energy is allowed out of a subject device than is allowed into such device, which allows for attenuation of undesired frequency ranges entering the filter while allowing output pulses to exit without distortion.
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: February 15, 2011
    Assignee: AVX Corporation
    Inventors: Joseph M. Hock, John L. Galvagni
  • Publication number: 20110012692
    Abstract: Embodiments of the present invention relate generally to reconstruction filtering. In particular, embodiments enable highly linear, highly programmable, and easily reconfigurable reconstruction filters. Further, embodiments provide substantial power consumption, area, and cost savings compared to conventional solutions. For example, embodiments use all-passive filtering and substantially reduce active elements compared to conventional solutions. As a result, significant reductions in required area, noise, and power consumption can be achieved. In addition, embodiments perform filtering solely in the current domain, thereby eliminating the non-linear voltage-to-current conversion used in conventional circuits and enabling highly linear filtering. Furthermore, embodiments are highly programmable and easily reconfigurable without the use of tunable capacitors. As such, embodiments are very suitable solutions for multi-band multi-mode wireless transmitters.
    Type: Application
    Filed: July 17, 2009
    Publication date: January 20, 2011
    Applicant: Broadcom Corporation
    Inventors: Ahmad MIRZAEI, Hooman Darabi
  • Publication number: 20110012652
    Abstract: A loop filter for receiving an input signal indicative of a phase-difference between a reference signal and a signal output by a signal generator and forming a control signal for controlling the signal generator in dependence thereon, the loop filter comprising a plurality of filter components that determine the frequency response of the filter, said filter components being arranged so that a first set of said components determines one or more zeros of the filter's frequency response and a second set of said components determines one or more poles of the filter's frequency response, each of said first and second sets of filter components being independent of the other such that the zero(s) and pole(s) of the filter's frequency response may be selected independently.
    Type: Application
    Filed: March 5, 2009
    Publication date: January 20, 2011
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventors: Pasquale Lamanna, Nicolas Sornin
  • Publication number: 20100327944
    Abstract: A signal buffer amplifier with high linearity is provided. A circuit includes a first transistor having a first gate terminal, a first source terminal, and a first drain terminal. The circuit also includes a second transistor having a second gate terminal, a second source terminal, and a second drain terminal, the second drain terminal coupled to the first source terminal. The circuit further includes a first signal path coupled in between a signal input and the first gate terminal, a second signal path coupled in between the signal input and the second gate terminal, and a signal output coupled to the second source terminal. The first signal path includes a filter.
    Type: Application
    Filed: June 18, 2010
    Publication date: December 30, 2010
    Applicant: FutureWei Technologies, Inc.
    Inventors: Gong Tom Lei, Yincai Liu, Minsheng Li
  • Publication number: 20100327991
    Abstract: A computer system includes a north bridge chip, a power source, and a resistor-capacitor filter circuit coupled between the power source and the north bridge chip. The north bridge chip has a digital-to-analog converter analog power pin and a digital-to-analog converter analog ground pin. The power source is coupled to the digital-to-analog converter analog power pin of the north bridge chip. The resistor-capacitor filter includes a first resistor and a first capacitor. The first resistor is connected between the power source and the digital-to-analog converter analog power pin of the north bridge chip. One end of the first capacitor is connected to the digital-to-analog converter analog power pin of the north bridge chip, and another end of the first capacitor is connected to ground together with the digital-to-analog converter analog ground pin of the north bridge chip.
    Type: Application
    Filed: October 14, 2009
    Publication date: December 30, 2010
    Applicants: HONG FU JIN PRECISION INDUSTRY (ShenZhen CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.
    Inventor: KE-YOU HU
  • Publication number: 20100321104
    Abstract: A network filter includes at least one X capacitor located between two supply lines and at least one discharge resistor that discharges the X capacitor, wherein the discharge resistor is arranged in series with at least one switching element, and at least one detector circuit that recognizes a network disconnection and closes the switching element to discharge the X capacitor via the discharge resistor when a network disconnection is recognized.
    Type: Application
    Filed: June 22, 2010
    Publication date: December 23, 2010
    Applicant: Fujitsu Technology Solutions Intellectual Property GmbH
    Inventor: Peter Busch
  • Patent number: 7856220
    Abstract: A magneto-electric-induction conversion system of a wireless input device includes an emitter and a receiver. A plurality of serially-connected resonant circuits, arranged side by side, makes resonance, so transmission energy is enhanced. An electromagnetic wave is transmitted via an inductive antenna, then received and converted by predetermined parallel-connected resonant circuits into an available power source, so that the energy is effectively delivered.
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: December 21, 2010
    Assignee: Kye Systems Corp.
    Inventors: Jen Kai Cheng, Chien Lung Lu, Chun Nan Hsien, Yu Teng Wang
  • Publication number: 20100308903
    Abstract: A filtering arrangement comprises a reference voltage input (1) and a compensation current arrangement (10) coupled to the reference voltage input (1) and configured to provide a control current at a current output (2) as a function of a voltage at the reference voltage input (1). The filtering arrangement also comprises a first and a second current source (20, 30) each having a control input (4, 5) coupled to the current output (2), a first and a second filter input (7, 8), and a first transistor (T1) and a second transistor (T2). The first transistor (T1) has a first connection (T11), a second connection (T12) and a control connection (T1c), where its first connection (T11) is coupled to the first current source (20) and its second connection (T12) is coupled to the first filter input (7) through a first resistor (R1).
    Type: Application
    Filed: November 14, 2008
    Publication date: December 9, 2010
    Applicant: austriamicrosystems AG
    Inventor: Pramod Singnurkar
  • Publication number: 20100277014
    Abstract: A hand tool RFI suppression system comprising a DC motor having a conductive housing, a power supply and a suppression circuit board supporting at least one suppression assembly and at least one ground circuit electrically coupled to the suppression assembly. The suppression circuit board is mounted to the motor housing with the at least one suppression assembly electrically coupled in parallel between the power supply and the DC motor and the ground circuit is electrically coupled to the motor housing. A method of suppressing RFI in a power hand tool is also provided.
    Type: Application
    Filed: May 4, 2009
    Publication date: November 4, 2010
    Applicant: Ingersoll-Rand Company
    Inventor: Walter Ernest Hicks
  • Patent number: 7825750
    Abstract: Disclosed relates to an electromagnetic interference (EMI) filter. Capacitance and resistance or inductance of an EMI filter, which includes a resistor and a capacitor or an inductor and a capacitor, can be controlled, such that a cutoff frequency can be freely controlled without manufacturing a separate EMI filter according to a characteristic of a desired cutoff frequency. Further, an intelligent EMI filter that can be applied to a surge protection device, which includes an ESD protection function as well as the EMI filter, is provided, such that a process can be simplified and costs can be reduced.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: November 2, 2010
    Assignee: Petari Incorporation
    Inventors: Kye Nam Lee, Young Jin Park, Jin Hyung Kim, Hyun Kyu Yang, Yoo Ran Kim
  • Publication number: 20100271151
    Abstract: In varying embodiments, the present inventive concepts relate to a notch filter for quadrature and differential signaling. No inductor is used in this notch filter, thus the integrated circuits silicon die area is small. In addition, the linearity of the notch filter is excellent because of the linearity of the resistors and capacitors in integrated circuits.
    Type: Application
    Filed: April 27, 2009
    Publication date: October 28, 2010
    Inventor: JENWEI KO
  • Publication number: 20100271248
    Abstract: A ramp wave output circuit includes a ramp wave generation circuit generating a ramp wave, and a low-pass filter having a variable cutoff frequency, which receives the ramp wave. The low-pass filter operates at a first cutoff frequency for a predetermined time period after the receipt of the ramp wave, and at a second cutoff frequency, which is larger than the first cutoff frequency, after the predetermined time period has passed.
    Type: Application
    Filed: November 25, 2008
    Publication date: October 28, 2010
    Inventors: Yuusuke Yamaoka, Hiroshi Kimura, Masahiro Higuchi
  • Patent number: 7821352
    Abstract: The present invention is a wideband directional coupler comprising first and second coupled transmission lines and first and second equalizers connected at opposite ends of the coupled portion of the second transmission line. Illustratively, the first and second equalizers are RC filters. The first and second equalizers are designed to have transmission characteristics that vary with frequency so as to offset the frequency variation of the coupling factor of the coupled transmission lines.
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: October 26, 2010
    Assignee: Smiths Interconnect Microwave Components, Inc.
    Inventors: Khamsouk Sanvoravong, Robert Torsiello
  • Publication number: 20100265008
    Abstract: A system and method for minimizing phase jumps in an output signal.
    Type: Application
    Filed: April 21, 2009
    Publication date: October 21, 2010
    Applicant: Infineon Technologies AG
    Inventor: Krzysztof Dufrene
  • Publication number: 20100244983
    Abstract: A method and apparatus to provide a bi-directional constant impedance filter. Embodiments include electric networks which give filter responses while presenting a constant impedance to a signal received at either an input or an output port for a plurality of frequencies.
    Type: Application
    Filed: March 31, 2009
    Publication date: September 30, 2010
    Applicant: 2WIRE, INC.
    Inventor: Curtis M. Allen
  • Publication number: 20100219908
    Abstract: A digital to analog converter for converting a digital input signal provided by a host to an analog output signal includes a modulator receiving the digital input signal, modulating the digital input signal, and outputting a modulated signal, and a filtering circuit receiving the modulated signal, low pass filtering the modulated signal, and outputting the analog output signal to an output node. The filtering circuit includes a first switching circuit for adjusting the bandwidth of the filtering circuit according to a bandwidth switching signal.
    Type: Application
    Filed: February 27, 2009
    Publication date: September 2, 2010
    Applicant: MEDIATEK INC.
    Inventors: Li-Chun Tu, Chia-Wei Liao, Tysh-Bin Liu
  • Patent number: 7786824
    Abstract: A multilayer filter has a capacitor element body, at least two signal terminal electrodes, and at least one grounding terminal electrode. The capacitor element body has a plurality of laminated insulator layers, a first signal internal electrode and a grounding internal electrode arranged to be opposed to each other with at least one insulator layer out of the plurality of insulator layers in between, and a second signal internal electrode arranged to be opposed to either one internal electrode of the first signal internal electrode and the grounding internal electrode with at least one insulator layer out of the plurality of insulator layers in between. The second signal internal electrode is connected to the at least two signal terminal electrodes. The first signal internal electrode is connected through a through-hole conductor to only the second signal internal electrode. The grounding internal electrode is connected to the at least one grounding terminal electrode.
    Type: Grant
    Filed: July 6, 2007
    Date of Patent: August 31, 2010
    Assignee: TDK Corporation
    Inventor: Masaaki Togashi
  • Patent number: 7772938
    Abstract: The electric multiple conductor system (1) is used for the transmission of signals in differential mode, and has two signal lines (5, 6) and a shared reference line (7). Each signal line (5, 6) includes an attenuation or filter element (13, 14) with a connection branch (15, 16), which runs between a branch node (20, 21) in the respective signal line (5, 6) and the reference line (7). The attenuation or filter elements (13, 14) of the respective signal lines (5, 6) are nominally of the same size. Each connection branch (15, 16) respectively includes a serial connection of a first partial branch (17, 18) having a first reactive impedance (23, 24) and a second partial branch (19) having a second reactive impedance (25). The second partial branch (19) is a shared component of all attenuation or filter elements (13, 14). The multiple conductor system (1) achieves a very high level of common mode suppression.
    Type: Grant
    Filed: March 6, 2006
    Date of Patent: August 10, 2010
    Assignee: Conti Temic microelectronic GmbH
    Inventors: Goeran Schubert, Thomas Fischer
  • Publication number: 20100171370
    Abstract: Described herein are embodiments of a wireless power transmitter device for transmitting power to at least one high-Q resonator that includes a first portion, formed of a high-Q magnetic resonator, and a high frequency generation system, having a number of components, wherein at least one of said components is formed using a process which creates nanoscale features.
    Type: Application
    Filed: March 18, 2010
    Publication date: July 8, 2010
    Inventors: Aristeidis Karalis, Andre B. Kurs, Robert Moffatt, John D. Joannopoulos, Peter H. Fisher, Marin Soljacic