Rc Or Rl Type Patents (Class 333/172)
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Publication number: 20110012692Abstract: 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: ApplicationFiled: July 17, 2009Publication date: January 20, 2011Applicant: Broadcom CorporationInventors: Ahmad MIRZAEI, Hooman Darabi
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Publication number: 20100327944Abstract: 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: ApplicationFiled: June 18, 2010Publication date: December 30, 2010Applicant: FutureWei Technologies, Inc.Inventors: Gong Tom Lei, Yincai Liu, Minsheng Li
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Publication number: 20100327991Abstract: 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: ApplicationFiled: October 14, 2009Publication date: December 30, 2010Applicants: HONG FU JIN PRECISION INDUSTRY (ShenZhen CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.Inventor: KE-YOU HU
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Publication number: 20100321104Abstract: 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: ApplicationFiled: June 22, 2010Publication date: December 23, 2010Applicant: Fujitsu Technology Solutions Intellectual Property GmbHInventor: Peter Busch
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Patent number: 7856220Abstract: 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: GrantFiled: June 20, 2008Date of Patent: December 21, 2010Assignee: Kye Systems Corp.Inventors: Jen Kai Cheng, Chien Lung Lu, Chun Nan Hsien, Yu Teng Wang
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Publication number: 20100308903Abstract: 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: ApplicationFiled: November 14, 2008Publication date: December 9, 2010Applicant: austriamicrosystems AGInventor: Pramod Singnurkar
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Publication number: 20100277014Abstract: 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: ApplicationFiled: May 4, 2009Publication date: November 4, 2010Applicant: Ingersoll-Rand CompanyInventor: Walter Ernest Hicks
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Patent number: 7825750Abstract: 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: GrantFiled: June 27, 2007Date of Patent: November 2, 2010Assignee: Petari IncorporationInventors: Kye Nam Lee, Young Jin Park, Jin Hyung Kim, Hyun Kyu Yang, Yoo Ran Kim
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Publication number: 20100271151Abstract: 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: ApplicationFiled: April 27, 2009Publication date: October 28, 2010Inventor: JENWEI KO
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Publication number: 20100271248Abstract: 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: ApplicationFiled: November 25, 2008Publication date: October 28, 2010Inventors: Yuusuke Yamaoka, Hiroshi Kimura, Masahiro Higuchi
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Patent number: 7821352Abstract: 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: GrantFiled: June 20, 2008Date of Patent: October 26, 2010Assignee: Smiths Interconnect Microwave Components, Inc.Inventors: Khamsouk Sanvoravong, Robert Torsiello
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Publication number: 20100265008Abstract: A system and method for minimizing phase jumps in an output signal.Type: ApplicationFiled: April 21, 2009Publication date: October 21, 2010Applicant: Infineon Technologies AGInventor: Krzysztof Dufrene
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Publication number: 20100244983Abstract: 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: ApplicationFiled: March 31, 2009Publication date: September 30, 2010Applicant: 2WIRE, INC.Inventor: Curtis M. Allen
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Publication number: 20100219908Abstract: 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: ApplicationFiled: February 27, 2009Publication date: September 2, 2010Applicant: MEDIATEK INC.Inventors: Li-Chun Tu, Chia-Wei Liao, Tysh-Bin Liu
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Patent number: 7786824Abstract: 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: GrantFiled: July 6, 2007Date of Patent: August 31, 2010Assignee: TDK CorporationInventor: Masaaki Togashi
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Patent number: 7772938Abstract: 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: GrantFiled: March 6, 2006Date of Patent: August 10, 2010Assignee: Conti Temic microelectronic GmbHInventors: Goeran Schubert, Thomas Fischer
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Publication number: 20100171370Abstract: 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: ApplicationFiled: March 18, 2010Publication date: July 8, 2010Inventors: Aristeidis Karalis, Andre B. Kurs, Robert Moffatt, John D. Joannopoulos, Peter H. Fisher, Marin Soljacic
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Patent number: 7728695Abstract: A multilayer filter comprises an inductor stacked-layer portion and a varistor stacked-layer portion. The varistor stacked-layer portion has a varistor layer the main component of which is ZnO and a hot electrode and ground electrode positioned in opposite with the varistor layer intervening, and the region enclosed between the opposing hot electrode and ground electrode does not contain a Cu component. Because the region enclosed between the opposing hot electrode and ground electrode is a region which manifests varistor characteristics, and thus the region does not contain a Cu component, degradation of the attenuation characteristics can be suppressed.Type: GrantFiled: March 28, 2008Date of Patent: June 1, 2010Assignee: TDK CorporationInventor: Takahiro Sato
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Patent number: 7719387Abstract: A multilayer filter 1 according to an embodiment of the present invention is a multilayer filter in which an inductor section 7 and a varistor multilayer section 9 are arranged to form an interface P, wherein varistor layers 81-84 contain ZnO as a major ingredient and additives of at least one element selected from the group consisting of Pr and Bi, Co, and Al, wherein inductor layers 61-69 contain ZnO as a major ingredient and contains no substantial amount of Co and Al, wherein an inductor diffusion layer 6D contains Li, wherein inductor conductor portions 121-128 are located 20 ?m or more away from the interface P, and wherein varistor conductor portions 16, 17 are located 40 ?m or more away from the interface P.Type: GrantFiled: February 19, 2008Date of Patent: May 18, 2010Assignee: TDK CorporationInventor: Takahiro Sato
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Patent number: 7719380Abstract: An AC coupling circuit is disclosed herein. An embodiment of the circuit comprises a first differential input and a second differential input. A first resistor is connected between the first differential input and the second differential input. A first capacitor is connected between the first differential input and a first differential output. A second capacitor is connected between the second differential input and a second differential output. A second resistor is connected between the first differential output and a node. A third resistor is connected between the second differential output and the node. A first potential is applied to the node.Type: GrantFiled: August 17, 2004Date of Patent: May 18, 2010Assignee: Hewlett-Packard Development Company, L.P.Inventors: Jeffry D. Yetter, Dacheng Zhou
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Publication number: 20100109804Abstract: An electrical multilayer component includes a basic body having at least one stack of dielectric layers and electrode layers arranged alternately one above another. The component also includes an electrically non-connected shielding structure.Type: ApplicationFiled: November 3, 2009Publication date: May 6, 2010Inventor: Thomas Feichtinger
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Patent number: 7683739Abstract: Disclosed is a signal filter assembly, which includes a circuit board electrically connected between a cable and a high frequency electric connector, and a plurality of filters installed in the circuit board and respectively electrically connected to the signal wires of the transmission wires of the cable, each filter being formed of a parallel circuit of a resistor and a capacitor.Type: GrantFiled: June 21, 2005Date of Patent: March 23, 2010Assignee: Sure-Fire Electrical CorporationInventor: Chang-Ping Wang
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Publication number: 20100060381Abstract: 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: ApplicationFiled: September 9, 2008Publication date: March 11, 2010Inventors: Rabindra N. Das, John M. Lauffer, Irving Memis, Steven G. Rosser
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Publication number: 20100033266Abstract: A compact planar microwave blocking filter includes a dielectric substrate and a plurality of filter unit elements disposed on the substrate. The filter unit elements are interconnected in a symmetrical series cascade with filter unit elements being organized in the series based on physical size. In the filter, a first filter unit element of the plurality of filter unit elements includes a low impedance open-ended line configured to reduce the shunt capacitance of the filter.Type: ApplicationFiled: August 5, 2009Publication date: February 11, 2010Applicant: U.S.A as Represented by the Administrator of the National Aeronautics and Space AdministratorInventors: KONGPOP U-YEN, Edward J. Wollack
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Patent number: 7649407Abstract: An integrated, multi-band radio frequency (RF) filter is capable of modifying a filter response thereof in response to control information. Switching elements within the filter can be changed between on and off conditions to modify the filter response. In one implementation, the integrated, multi-band filter is integrated on a front end module chip to be used within a multi-radio wireless device. In at least one embodiment, linearity enhancement circuitry is provided within a multi-band filter to improve linearity and reduce insertion loss.Type: GrantFiled: September 28, 2007Date of Patent: January 19, 2010Assignee: Intel CorporationInventors: Nader Rohani, Hongtao Xu, Yulin Tan
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Publication number: 20100001812Abstract: 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: ApplicationFiled: July 2, 2008Publication date: January 7, 2010Applicant: ATMEL CORPORATIONInventor: MARVIN L. KAUSCH
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Patent number: 7633358Abstract: A phase shifter circuit includes a plurality of first series circuits each comprised of a series connection of one capacitor and one resistor, a first circuit element including at least inductance connecting between a first end and a second end of a chain structure made by connecting the plurality of first series circuits in series, the first circuit element and the chain structure together constituting a first loop circuit, a plurality of second series circuits each comprised of a series connection of one capacitor and one resistor, a second circuit element including at least inductance connecting between a first end and a second end of a chain structure made by connecting the plurality of second series circuits in series, the second circuit element and the chain structure together constituting a second loop circuit, and a plurality of connection lines connecting between the first loop circuit and the second loop circuit.Type: GrantFiled: December 1, 2006Date of Patent: December 15, 2009Assignee: Fujitsu LimitedInventors: Yasuhiro Nakasha, Tatsuya Hirose
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Publication number: 20090258626Abstract: A filter circuit includes first capacitors, second capacitors capable of altering a cutoff frequency by being connected in parallel with the first capacitors, first switches for connecting the second capacitors in parallel with the first capacitors, and charging circuits for the second capacitors. The charging circuits include second switches, and resistances for attenuating the amplitudes of input voltages to be fed to the second capacitors, by being connected in series with the second capacitors. The second capacitors are charged through the resistances in a state where the first switches are turned OFF and where the second switches are turned ON. Thus, a DC offset which is ascribable to the cutoff frequency switching of a filter is reduced.Type: ApplicationFiled: April 7, 2009Publication date: October 15, 2009Applicant: RENESAS TECHNOLOGY CORP.Inventors: Masaaki YAMADA, Yusaku KATSUBE, Junichi TAKAHASHI, Toshihito HABUKA, Fumihito YAMAGUCHI
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Publication number: 20090243755Abstract: 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: ApplicationFiled: March 10, 2009Publication date: October 1, 2009Applicants: SANYO Electric Co., Ltd., SANYO Semiconductor Co., Ltd.Inventor: Eio ONODERA
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Publication number: 20090243756Abstract: A shielded three-terminal flat-through EMI/energy dissipating filter includes an active electrode plate through which a circuit current passes between a first terminal and a second terminal, a first shield plate on a first side of the active electrode plate, and a second shield plate on a second side of the active electrode plate opposite the first shield plate. The first and second shield plates are conductively coupled to a grounded third terminal. In preferred embodiments, the active electrode plate and the shield plates are at least partially disposed with a hybrid flat-through substrate that may include a flex cable section, a rigid cable section, or both.Type: ApplicationFiled: March 19, 2009Publication date: October 1, 2009Applicant: Greatbatch Ltd.Inventors: Robert A. Stevenson, Buehl E. Truex, Richard L. Brendel, Christine A. Frysz, Warren S. Dabney, Haytham Hussein, Jose Luis Lorente Adame, Robert Shawn Johnson, Scott Brainard
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Publication number: 20090195319Abstract: The present invention relates to a large time constant steering circuit for slowly changing a voltage on a node between at least two discrete voltage levels. The present invention further relates to a slow steering current DAC comprising said large time constant steering circuit. The present invention further relates to an instrumentation amplifier device comprising a current balancing instrumentation amplifier for amplifying an input signal to an amplified output signal and a DC servo-loop for removing a DC-component from the input signal. The present invention further relates to an EEG acquisition ASIC comprising said instrumentation amplifier device.Type: ApplicationFiled: January 30, 2009Publication date: August 6, 2009Applicants: Interuniversitair Microelektronica Centrum (IMEC), Katholieke Universiteit LeuvenInventors: Refet Firat Yazicioglu, Patrick Merken
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Patent number: 7567151Abstract: A multilayer filter has a capacitor element body, at least two signal terminal electrodes, at least one grounding terminal electrode, and at least one connection conductor. The capacitor element body has a plurality of laminated insulator layers, a first signal internal electrode and a grounding internal electrode arranged so as 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 so as 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 first signal internal electrode is connected to the at least one connection conductor. The second signal internal electrode is connected to the at least two signal terminal electrodes and to the at least one connection conductor.Type: GrantFiled: July 6, 2007Date of Patent: July 28, 2009Assignee: TDK CorporationInventor: Masaaki Togashi
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Patent number: 7538633Abstract: One embodiment of the present invention provides a system which drives on-chip wires using capacitive coupling. During operation, the system drives a signal onto a driven wire. This signal feeds from the driven wire through a coupling capacitor onto a coupled wire, which is an on-chip wire that routes the signal to its destination. Feeding the signal through the coupling capacitor reduces the voltage swing of the corresponding coupled signal on the coupled wire, thereby lessening the power required to drive the coupled signal on the coupled wire.Type: GrantFiled: September 28, 2004Date of Patent: May 26, 2009Inventors: Robert J. Drost, Ronald Ho, Tarik Ono
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Publication number: 20090091403Abstract: A method for the contactless transmission of at least one differential signal between a transmitter and a receiver given the existence of at least one common-mode noise signal, which has a low frequency in comparison with at least one signal to be transmitted, is provided. The suppression of at least one common-mode noise signal within the receiver a ground reference potential assigned to the receiver is separated into two ground reference potentials decoupled from one another. At least one common-mode noise signal may be suppressed by a filter unit at the input of a receive amplifier of the receiver.Type: ApplicationFiled: October 3, 2008Publication date: April 9, 2009Inventors: Markus Hemmerlein, Helmut Repp
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Publication number: 20090066446Abstract: In a method and system for filtering an input signal with a filter included in a phase locked loop (PLL), a unidirectional feedback path is configured from an output of the filter to an input of the filter. The unidirectional feedback path includes a feedback resistor that is configured to adjust a bandwidth of the PLL. A zero path is configured from the output to a voltage reference, such as ground. The zero path includes a capacitor coupled in series with a bias resistor. The bias resistor, which along with the capacitor determines a zero frequency of the filter, is configured to reduce a value of the capacitor without a substantial increase in a phase noise of the PLL due to the unidirectional nature of the feedback. A reduction in the value of the capacitor enables a corresponding reduction in a silicon area to form the capacitor.Type: ApplicationFiled: September 12, 2007Publication date: March 12, 2009Inventors: Debapriya Sahu, Saravana Ganeshan
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Patent number: 7501915Abstract: A high frequency module reduces the inhibition in magnetic flux generated in an inductor and stray capacitance while simultaneously attaining shorter height and smaller size. The high frequency module includes a passive circuit having an inductor and a capacitor. One component part of the passive circuit is mounted as an electronic part on the substrate, while the other component part f the passive circuit is formed within the substrate. A ground electrode is further provided between the one component part of the passive circuit and the other component part.Type: GrantFiled: October 30, 2006Date of Patent: March 10, 2009Assignee: Taiyo Yuden Co., Ltd.Inventor: Ryuji Murata
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Patent number: 7501914Abstract: A bias circuit that supplies bias voltage or bias current to one end of a transmission line includes an inductor that prohibits a high frequency component of a baseband signal transmitted on the transmission line and passes a frequency component near direct current of the baseband signal, and an impedance-decrease prevention element that prevents impedance from decreasing, when viewed from the transmission line, that is produced due to a resonance between a parasitic capacitance generated due to the inductor and an inductance of the inductor.Type: GrantFiled: April 28, 2004Date of Patent: March 10, 2009Assignee: Mitsubishi Electric CorporationInventors: Kenkichi Shimomura, Takashi Sugihara, Katsuhiro Shimizu
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Publication number: 20090009266Abstract: An antenna damping circuit in which the frequency characteristics of damping amount can be made substantially flat by providing a resistor (Ra) between PIN diodes (D1, D2) having a resistance varying upon application of a control voltage (Vc) and a capacitive dummy antenna circuit (10), and setting its resistance high enough to neglect the capacity of the dummy antenna circuit (10) sufficiently when the dummy antenna circuit (10) is viewed from the side of the PIN diodes (D1, D2) thereby substantially eliminating the influence of capacity of the dummy antenna circuit (10).Type: ApplicationFiled: November 7, 2005Publication date: January 8, 2009Inventor: Kazuhisa Ishiguro
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Publication number: 20080297274Abstract: This invention relates to a capacitive/resistive device, which may be embedded within a layer of a printed wiring board. Embedding the device conserves board surface real estate, and reduces the number of solder connections, thereby increasing reliability. More specifically, the device, comprises a first metallic foil; a second metallic foil; a first electrode formed from the first metallic foil; a dielectric disposed over the first electrode; a resistor element formed on and adjacent to the dielectric; a conductive trace; and a second electrode formed from the second metallic foil and disposed over the dielectric and in electrical contact with the resistor element, wherein the dielectric is disposed between the first electrode and the second electrode and wherein said dielectric comprises an unfilled polymer of dielectric constant less than 4.0.Type: ApplicationFiled: August 8, 2008Publication date: December 4, 2008Inventors: WILLIAM J. BORLAND, G. Sidney Cox, David Ross McGregor
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Patent number: 7459995Abstract: A small-sized noise suppression circuit capable of suppressing noise in a wide frequency range is realized. A noise suppression circuit has first and second inductors inserted in series in a first conductive line, and a series circuit configured to have a third inductor and a first capacitor connected in series. One end of the series circuit is connected to a junction of the first and second inductors and the other end is connected to a second conductive line. Even when a coupling coefficient k between the first and second inductors is smaller than 1, by adjusting the value of the inductance of the third inductor in accordance with the value of the coupling coefficient k, an attenuation characteristic which is almost the same as or similar to that in an ideal state is obtained.Type: GrantFiled: January 31, 2005Date of Patent: December 2, 2008Assignee: TDK CorporationInventor: Mitsunari Suzuki
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Patent number: 7443267Abstract: A low-pass filter comprises a capacitor, first and second varistors, a resistor, and first to third external electrodes. The capacitor includes a dielectric body and first to third internal electrodes. The first internal electrode is connected to the third external electrode physically and electrically. The second internal electrode is connected to the second external electrode physically and electrically. At least a portion of the second internal electrode opposes the first internal electrode through at least a portion of the dielectric body. The third internal electrode is connected to the first external electrode physically and electrically. At least a portion of the third internal electrode opposes the first internal electrode through at least a portion of the dielectric body. The first varistor is connected in parallel to a capacitor constituted by the first and third internal electrodes. The second varistor is connected in parallel to a capacitor constituted by the first and second internal electrodes.Type: GrantFiled: March 19, 2007Date of Patent: October 28, 2008Assignee: TDK CorporationInventors: Yo Saito, Izuru Soma, Hitoshi Tanaka
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Patent number: 7432784Abstract: A noise filter has an element body, first to fourth terminal electrodes, and a connection conductor. The first to fourth terminal electrodes are disposed on the exterior of the element body. The connection conductor is also disposed on the exterior of the element body. A capacitor is formed in the element body and is electrically connected between the first and second terminal electrodes and the third and fourth terminal electrodes. The first and second terminal electrodes are electrically connected through the connection conductor. The connection conductor is covered by a resin containing ferrite. Since the connection conductor is covered by the resin containing ferrite, the connection conductor and the ferrite-containing resin function as a ferrite bead inductor.Type: GrantFiled: January 19, 2007Date of Patent: October 7, 2008Assignee: TDK CorporationInventor: Masaaki Togashi
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Patent number: 7423500Abstract: A plurality of conductive patterns constituting first, second, and third inductors are formed in a multi-layer wiring board. A fifth dielectric layer is disposed between second to fourth dielectric layers having the first inductor and a seventh dielectric layer having the second inductor. First and second electrode layers are disposed facing each other across the fifth dielectric layer so as to constitute a capacitor. The capacitor is disposed between the first and third inductors and the second inductor. The first electrode layer, i.e., one electrode of the capacitor, is a ground layer.Type: GrantFiled: September 15, 2006Date of Patent: September 9, 2008Assignee: Alps Electric Co., Ltd.Inventor: Hiroyuki Ishiwata
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Patent number: 7424276Abstract: In a transmitter of polar-loop architecture having a phase control loop and an amplitude control loop, as loop filters for controlling a loop band of the amplitude control loop, a first filter with lag-lead characteristics (secondary or more filter including a capacitor and a resistor) and a second filter of a perfect integrator type (filter including only a capacitor) are employed, and current-output type circuits are connected to respective front stages of the first and second filters.Type: GrantFiled: February 18, 2003Date of Patent: September 9, 2008Assignees: Renesas Technology Corp., TTPCOM LimitedInventors: Taizo Yamawaki, Hisayoshi Kajiwara, Ryoichi Takano, Patrick Wurm
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Publication number: 20080197940Abstract: A method of making an orientation-insensitive ultra-wideband coupling capacitor, including the steps of securing an unterminated multi-layer capacitor of a low frequency portion of the orientation-insensitive ultra-wideband coupling capacitor, coating completely the unterminated multi-layer capacitor of the low frequency portion with an adhesion layer having opposing ends, creating a circumferential slot around the adhesion layer and thereby electrically separating the opposing ends of the adhesion layer from each other thereby restoring capacitance and forming a slotted body, applying a solder dam coating to all surfaces defining the circumferential slot to protect the circumferential slot, and plating the opposing ends of the adhesion layer so as to form solderable connections and thereby form the orientation-insensitive ultra-wideband coupling capacitor.Type: ApplicationFiled: April 25, 2008Publication date: August 21, 2008Inventor: John Mruz
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Patent number: 7405636Abstract: Four input nodes I1-I4 for inputting 4-phase signals, four resistors R1-R4, four capacitors C1-C4, and four output nodes O1-O4 for outputting 4-phase signals are provided. The resistors and the capacitors are connected alternately in a loop, and the input nodes and output nodes are connected alternately to the respective nodes between the resistors and the capacitors sequentially. Each of the four resistors is composed of a group of three or more partial resistors, and three groups of the partial resistors R2a-R2c, R3a-R3c and R4a-R4c are collected respectively and arranged in the same attitude, while the partial resistors R1a-R1c of the remaining group are distributed into the other groups and arranged in the same line the same attitude as the partial resistors of each of the other groups. The regions of the thus collected groups are arranged in one direction.Type: GrantFiled: April 24, 2006Date of Patent: July 29, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masayuki Ozasa, Akio Yokoyama, Manabu Ookubo, Takao Soramoto
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Publication number: 20080137380Abstract: This invention relates to methods and apparatus for sensing the output current in a switch mode power supply (SMPS) using primary side sensing. We describe a module which senses a current in a primary winding of a transformer and a voltage on a primary or auxiliary winding of the transformer, and which includes a multiplier coupled to an output of a signal averager averaging a primary winding current and to an output of a timing signal generator using the sensed voltage to signal when a secondary winding is powering an output of the SMPS, to multiply an averaged current sense signal by a fraction of a total cycle period of said SMPS during which the secondary winding is providing power to provide a signal estimating an output current of the SMPS.Type: ApplicationFiled: January 22, 2008Publication date: June 12, 2008Inventors: Johan Piper, David M. Garner, David Robert Coulson
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Publication number: 20080099881Abstract: A semiconductor element for macro and micro frequency tuning, and an antenna and a frequency tuning circuit having the semiconductor element, are provided. The semiconductor element includes first and second semiconductors which have a same polarity, a third semiconductor which has a polarity opposite to the polarity of the first and second semiconductors and is interposed between the first and the second semiconductors, a first intrinsic semiconductor which is interposed between the first and the third semiconductors, and a second intrinsic semiconductor which is interposed between the third and the second semiconductors.Type: ApplicationFiled: March 28, 2007Publication date: May 1, 2008Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Chang-won Jung, Jung-han Choi, In-sang Song, Young-eil Kim
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Patent number: 7332976Abstract: 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: GrantFiled: February 3, 2006Date of Patent: February 19, 2008Assignee: Cypress Semiconductor CorporationInventor: Aaron Brennan
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Publication number: 20080036555Abstract: A multilayer filter has a capacitor element body, at least two signal terminal electrodes, at least one grounding terminal electrode, and at least one connection conductor. The capacitor element body has a plurality of laminated insulator layers, a first signal internal electrode and a grounding internal electrode arranged so as 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 so as 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 first signal internal electrode is connected to the at least one connection conductor. The second signal internal electrode is connected to the at least two signal terminal electrodes and to the at least one connection conductor.Type: ApplicationFiled: July 6, 2007Publication date: February 14, 2008Applicant: TDK CORPORATIONInventor: Masaaki Togashi