Lumped Impedance Patents (Class 455/320)
  • Patent number: 8731504
    Abstract: A method of filtering and a RF filtering circuit comprising a LO adapted to generate in-phase and quadrature LO signals; a quadrature passive mixer operatively connected to the LO; a filtering impedance operatively connected to the quadrature passive mixer, wherein the voltage at an input node of the quadrature passive mixer comprises the voltage across the filtering impedance up-converted to a frequency of a LO signal received by the quadrature passive mixer. Preferably, the voltage across the filtering impedance comprises a frequency of an input signal of the quadrature passive mixer down-converted by a frequency of the in-phase and quadrature LO signals and filtered by the filtering impedance.
    Type: Grant
    Filed: September 16, 2010
    Date of Patent: May 20, 2014
    Assignee: Newport Media, Inc.
    Inventors: Aly Ismail, Edward Youssoufian, Hassan Elwan, Frank Carr
  • Patent number: 8688067
    Abstract: A sampling circuit and a receiver are provided having a high flexibility of filter design and excellent characteristics for removing an interfering wave. Provided also are a sampling circuit and a receiver having a low level of the higher harmonic spurious. The sampling circuit includes a charge sampling circuit, which executes sampling of an input signal, and a plurality of charge sharing circuits connected in parallel to the output stage of the charge sampling circuit. The charge sharing circuits include a charge sharing circuit group having transmission functions different from one another, a synthesis circuit, which is arranged at the output side of the charge sharing circuit group and synthesizes the outputs of the charge sharing circuits, and a digital control unit, which outputs a control signal for controlling the operation of the charge sharing circuit group and the synthesis circuit.
    Type: Grant
    Filed: December 4, 2009
    Date of Patent: April 1, 2014
    Assignee: Panasonic Corporation
    Inventor: Yohei Morishita
  • Patent number: 8639203
    Abstract: An antenna system for reception of channel signals form the UHF band by a receiver, including an electrically small antenna and, connected between the port connected to the antenna and that of the receiver, an active impedance matching device controlled by command signals depending on the quality of the signal received by the receiver to compensate for the impedance variations due to the environment associated with the antenna and to reject the frequencies of interfering channels adjacent to the reception channel without interfering with the active impedance matching of the antenna.
    Type: Grant
    Filed: August 26, 2010
    Date of Patent: January 28, 2014
    Assignee: Thomson Licensing
    Inventors: Jean-Luc Robert, Philippe Minard, Brice Praho
  • Patent number: 8472894
    Abstract: A signal transmitting/receiving circuit includes a transmitter, a receiver, a balun and an impedance matching circuit. The transmitter is utilized for transmitting an output signal. The receiver is utilized for receiving an input signal. The balun includes a first input terminal, a second input terminal and an output terminal. The impedance matching circuit, which is coupled between the transmitter, the receiver, and the balun, provides transmitting impedance when the transmitter transmits the output signal such that an output signal may be output at an output terminal of the balun via a transmitting path. Also, the impedance matching circuit provides transmitting impedance when the receiver receives the input signal such that the input signal may be transmitted from the output terminal of the balun to the receiver via a receiving path.
    Type: Grant
    Filed: December 28, 2010
    Date of Patent: June 25, 2013
    Assignee: Realtek Semiconductor Corp.
    Inventors: Po-Chih Wang, Chia-Jun Chang
  • Patent number: 8351891
    Abstract: A wideband distributed mixer capable of operation over a wide range of frequencies is provided. The mixer can include a plurality of N mixer stages and monolithic transmission lines integrated together on a common semiconductor substrate. The length of each transmission line between adjacent stages can be predetermined such that an IF signal output from each stage is in-phase with the IF signal output from any preceding stage, allowing the mixer to output a mixed IF signal that is a constructive sum of the IF output signals from each constituent stage. The number of mixer stages as well as the design architectures and topologies for each stage can be varied according to the needs of the application.
    Type: Grant
    Filed: May 28, 2004
    Date of Patent: January 8, 2013
    Assignee: The Regents of the University of California
    Inventors: Payam Heydari, Ahmad Yazdi
  • Patent number: 8010084
    Abstract: An RF power delivery diagnostic system is provided herein. The system comprises an RF power source (303), an impedance matching network (305), a plasma reactor (307) in electrical contact with the RF power source by way of the impedance matching network, a first RF sensor (309) adapted to measure at least one attribute of the RF power input to the impedance matching network, and a second RF sensor (311) adapted to measure at least one attribute of the RF power output by the impedance matching network.
    Type: Grant
    Filed: June 17, 2008
    Date of Patent: August 30, 2011
    Assignee: Turner Enterprises & Associates
    Inventor: Terry R. Turner
  • Patent number: 7991375
    Abstract: A radio frequency (RF) front-end includes a plurality of power amplifier modules and a plurality of impedance matching circuits. Each of the plurality of impedance matching circuits includes an input connection and an output connection, wherein outputs of the plurality of power amplifier modules are coupled to corresponding input connections of the plurality of impedance matching circuits to provide a desired loading of the plurality of power amplifier modules and wherein the output connections of the plurality of impedance matching circuits are coupled together to add power of the plurality of power amplifiers.
    Type: Grant
    Filed: April 3, 2007
    Date of Patent: August 2, 2011
    Assignee: Broadcom Corporation
    Inventor: Ali Afsahi
  • Patent number: 7986924
    Abstract: An impedance control apparatus and method for portable mobile communication terminal is disclosed capable of accurately adjusting impedances relative to environment when the portable mobile communication terminal is being used, wherein an impedance of a first variable impedance matching part is varied to receive a reception impedance correction signal transmitted by a base station and to detect a reception strength, an impedance of the first variable impedance matching part is set by a impedance value of the largest reception strength out of the reception strengths, the portable mobile communication terminal varies the impedance of a second variable impedance matching part to transmit a transmission impedance correction signal to a base station and to allow the base station to detect the reception strength, and the impedance setting of the second variable impedance matching part is performed using the reception strength detected by the base station.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: July 26, 2011
    Assignee: LG Electronics Inc.
    Inventors: Hong Teuk Kim, Kwy Ro Lee
  • Publication number: 20110092176
    Abstract: A receiver circuit includes an amplifier, an output impedance, and a mixer. The amplifier is arranged to generate an amplifier output. The mixer has an input and an output respectively coupled to the amplifier and the output impedance. The output impedance sets frequency selectivity provided at the input of the mixer, and the mixer is arranged to down-convert a signal derived from the amplifier output and accordingly generate a down-converted signal at the output of the mixer for further signal processing.
    Type: Application
    Filed: December 27, 2010
    Publication date: April 21, 2011
    Applicant: MEDIATEK INC.
    Inventors: Alyosha Molnar, Rahul Magoon
  • Patent number: 7903762
    Abstract: A direct conversion multi-band TV tuner includes: a plurality of RF (radio frequency) paths for processing the RF signal and for generating a plurality of processed RF signals, respectively; and a TSC (tri-state chopper) based quadrature frequency converter for receiving one of said processed RF signals and converting the received processed RF signal into a in-phase baseband signal and a quadrature baseband signals; wherein the TSC based quadrature frequency converter operates in accordance with a first set of periodic three-state control signals and a second set of periodic three-state control signals that are approximately 90 degrees offset from the first set of periodic three-state control signals.
    Type: Grant
    Filed: January 30, 2007
    Date of Patent: March 8, 2011
    Assignee: Realtek Semiconductor Corp.
    Inventor: Chia-Liang Lin
  • Patent number: 7899430
    Abstract: In the mobile radio communication system where the UMTS and an another system coexist an idle slot for observing the frequency component of another system is inserted in one superframe of UMTS. The duration of this idle slot is at most half of the duration of one frame that form the superframe and it is inserted at an interval of a specified number of frames. Therefore, the frequency component of the another system can be observed securely from the UMTS. Further, deterioration of interleaving performance of the compressed mode frames during such observation can be suppressed.
    Type: Grant
    Filed: April 19, 2007
    Date of Patent: March 1, 2011
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Nicolas Voyer, Yasuhiro Yano, Hideshi Murai
  • Patent number: 7809349
    Abstract: The present invention is an RF filter that translates impedances of an IF circuit to create a filter with an RF center frequency having the high Q roll-off characteristics of an IF filter. The RF filter is self-aligned with the frequency of an RF local oscillator. The RF filter has an impedance divider, which is formed by coupling an RF impedance circuit to a translated IF impedance circuit. The translated IF impedance circuit includes an RF passive mixer and an IF impedance circuit. The mixer translates the impedance of the IF impedance circuit by mixing an RF input signal with an RF local oscillator signal, which determines the RF center frequency. Filtered RF signals may be provided by the impedance divider. Filtered IF signals may be provided by the IF impedance circuit. To effectively translate and preserve the IF impedance characteristics, the IF impedance circuit presents a high impedance at harmonics of the RF local oscillator signal.
    Type: Grant
    Filed: April 25, 2007
    Date of Patent: October 5, 2010
    Assignee: RF Micro Devices, Inc.
    Inventors: Marcus Granger-Jones, Thomas McKay
  • Patent number: 7720469
    Abstract: A wireless telecommunication device, a method of frequency calibrating a wireless telecommunication device, and a computer program are provided. The method comprises: receiving a reference radio signal of the wireless telecommunications system; frequency synchronizing the wireless telecommunication device with the reference radio signal by adjusting a control parameter controlling a reference frequency generated by a reference frequency generator; measuring a temperature parameter characterizing the temperature of the reference frequency generator; and generating calibration information for calibrating the wireless telecommunication device on the basis of the control parameter and the temperature parameter.
    Type: Grant
    Filed: December 29, 2005
    Date of Patent: May 18, 2010
    Assignee: Nokia Corporation
    Inventor: Erik Olaf Kerstenbeck
  • Patent number: 7633907
    Abstract: A radio LAN (Local Area Network) system includes an access point and a mobile or a fixed station each having a physical layer implemented by a direct spread spectrum system. The LAN system uses different spread codes, maintains transmission power semi-fixed, and selects a frequency and a frequency band in accordance with the kind and amount of information. A data link layer above each physical layer includes an LLC (Logical Link Control) sublayer and an MAC (Media Access Control) sublayer. The MAC sublayer uses a CDMA (Code Division Multiple Access) system as an access system for thereby implementing a data structure in accordance with the kind and amount of information.
    Type: Grant
    Filed: June 5, 2006
    Date of Patent: December 15, 2009
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Hiroshi Etoh
  • Publication number: 20090131007
    Abstract: A receiver circuit comprising a quadrature passive mixer having an input and an output, and an input impedance of the quadrature passive mixer provides a band-pass response. One or more output impedances coupled to the output of the quadrature passive mixer. A low noise amplifier (LNA) having an input and an output coupled to the quadrature passive mixer, the LNA configured to provide substantially linear transconductance over a predetermined input range.
    Type: Application
    Filed: December 1, 2008
    Publication date: May 21, 2009
    Inventors: Alyosha Molnar, Rahul Magoon
  • Patent number: 7403764
    Abstract: An RF power delivery diagnostic system is provided herein. The system comprises an RF power source (303), an impedance matching network (305), a plasma reactor (307) in electrical contact with the RF power source by way of the impedance matching network, a first RF sensor (309) adapted to measure at least one attribute of the RF power input to the impedance matching network, and a second RF sensor (311) adapted to measure at least one attribute of the RF power output by the impedance matching network.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: July 22, 2008
    Inventor: Terry R. Turner
  • Patent number: 7395028
    Abstract: A satellite antenna switching apparatus has LNB ports to which LNBs are connected, receiver ports to which receivers that exchange signals with the LNBs are connected, cascade ports to which another switching apparatus is cascade-connected, and impedance circuits that function as means for detecting the signals exchanged between the LNBs and receivers. The impedance circuits provide impedances according to the connection states of the cascade ports, and are electrically disconnected from the signal paths when another switching apparatus is cascade-connected to the cascade ports. With this configuration, the satellite antenna switching apparatus suffers from less attenuation of the exchanged signals even in a cascade connection of a plurality of stages of switching apparatuses.
    Type: Grant
    Filed: February 13, 2004
    Date of Patent: July 1, 2008
    Assignee: Sharp Kabushi Kaisha
    Inventor: Tetsuhide Okahashi
  • Patent number: 7302226
    Abstract: A communication system for a mobile platform satellite service (MPSS) system includes a receiver subsystem (RS) and a transmitter subsystem (TS). A satellite transponder is in communication with the RS and the TS of the mobile platform. A satellite service ground station includes a transmitter subsystem (TS) and a receiver subsystem (RS). A communication link is established between the MPSS system and the ground station, via the satellite transponder. The communications link includes fixed satellite service (FSS) data superimposed on MPSS data in the same frequency band to thereby maximize both satellite transponder utilization and interference budget usage.
    Type: Grant
    Filed: May 24, 2004
    Date of Patent: November 27, 2007
    Assignee: The Boeing Company
    Inventor: Gary V Stephenson
  • Patent number: 5784692
    Abstract: An impedance-generating device that provides a resistance and a reactance that are non-linear functions of a signal over a wide impedance range (VariablE Non-Linear Impedance Circuit Electronics, "VENICE"). An electronic component that has a gain characteristic with a unity gain frequency that is directly proportional to that signal can be configured to generate such an impedance. Such an electronic component configured to provide a negative effective resistance and a variable non-linear reactance can be used to implement a high frequency harmonic generator. This generator can provide high order harmonics which can be used in high frequency communications systems. The electronic component can also be configured to provide only a voltage-variable non-linear reactance which can be used to implement a reactive mixer to frequency shift a high frequency signal to an intermediate frequency signal, from mixing the high frequency signal with a local oscillator signal.
    Type: Grant
    Filed: June 19, 1996
    Date of Patent: July 21, 1998
    Assignee: Neillen Technologies, Corp.
    Inventor: Leonard L. Kleinberg
  • Patent number: 5390349
    Abstract: A manner of using a plurality of transformers having cylindrical cores such that operation of the transformers at high frequencies allows the cores of the transformers to be disposed parallel to each other and in relatively close proximity without substantial interference.
    Type: Grant
    Filed: August 26, 1992
    Date of Patent: February 14, 1995
    Assignee: Synergy Microwave Corporation
    Inventors: Shankar R. Joshi, Meta Rohde
  • Patent number: 4981791
    Abstract: The present invention provides an RNA stabilization vector including a cloning vehicle, a group I intron inserted into the cloning vehicle and foreign DNA inserted into the intron. The present invention further provides a method for enhancing the production of a gene product by stabilizing the mRNA coding for the gene product using the RNA stabilization vector.
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: January 1, 1991
    Assignee: Health Research Incorporated
    Inventor: Marlene Belfort
  • Patent number: 4361910
    Abstract: A VHF tuner circuit comprising an oscillator for generating a harmonic which is close to the RF frequency, including resonant circuit means for providing a low impedance path for coupling the desired harmonic current to the mixer and for providing a high impedance path for all the other harmonics, thereby suppressing the reception of spurious signals.
    Type: Grant
    Filed: June 15, 1981
    Date of Patent: November 30, 1982
    Inventor: Howard S. Teller, Jr.