Having Harmonic Radiation Suppression Patents (Class 455/114.1)
  • Patent number: 10348358
    Abstract: This disclosure describes techniques for implementing and utilizing a transceiver in a communication device that has two separate radio-frequency (RF) power amplifiers that are optimized to transmit signals using separate communication standards. The power amplifiers may be designed to convert a lower-power RF signal into different higher-power signals according to different standard-mandated, output-power limits. In this way, a communication device may arbitrate between two transceiver chains that include respective power adapters in order to convert lower-power RF signals into different higher-power RF signals. The higher-power RF signals may have different output-power levels that are appropriate for the respective communication standards of the separate transceiver chains.
    Type: Grant
    Filed: May 21, 2018
    Date of Patent: July 9, 2019
    Assignee: Amazon Technologies, Inc.
    Inventors: Sameet Ramakrishnan, Ravi Ichapurapu, Milos Jorgovanovic
  • Patent number: 10256852
    Abstract: An electronic device is provided. The electronic device includes a communication module and a processor electrically connected to the communication module, wherein the communication module includes an antenna configured to transmit and receive a communication signal, a sensor configured to measure an impedance of the antenna, and a first matching circuit and a second matching circuit electrically connected to the antenna, and the processor is configured to receive information on the impedance of the antenna from the sensor, check control information on at least one of the first matching circuit and second matching circuit corresponding to the impedance of the antenna at least partially based on the received information on the impedance of the antenna, and transmit control information generated at least partially based on the checked control information to at least one of the first matching circuit and the second matching circuit corresponding to the control information.
    Type: Grant
    Filed: February 2, 2017
    Date of Patent: April 9, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-Hwan Ko, Man Seob Kim
  • Patent number: 10243254
    Abstract: An access control device including a credential reader circuit structured to enter a standby mode, awaken from the standby mode, and receive data from a nearby credential, and a credential detection circuit. The credential detection circuit includes a memory configured to store program instructions, an antenna circuit, and a processor electrically coupled to the antenna circuit and to the credential reader circuit, wherein the processor configured to execute the stored program instructions to: transmit an energizing signal; receive a modulated energizing signal with the antenna circuit; transmit an activation signal to the credential reader circuit in response to the received modulated energizing signal, wherein the received modulated energizing signal includes I and Q values; receive a false detection signal from the credential reader circuit; and adjust an impedance of the antenna circuit.
    Type: Grant
    Filed: August 25, 2016
    Date of Patent: March 26, 2019
    Assignee: Schlage Lock Company LLC
    Inventors: Frank A. Nardelli, Michael Reuter, William B. Ainley
  • Patent number: 10003303
    Abstract: An amplifier may include control circuitry that may track a first input signal parameter and, in response, adjust a value of a second input parameter. Input parameter tracking and adjustment may facilitate control of output parameters for the amplifier. For example, an envelope-tracking amplifier may track input signal amplitude and adjust other input parameters in response. The adjustments may facilitate control of output parameters, such as gain or efficiency. The amplifier may further include calibration circuitry to determine adjustment responses to various tracked input parameters.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: June 19, 2018
    Assignee: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.
    Inventors: Ali Afsahi, Debopriyo Chowdhury, Rethnakaran Pulikkoonattu, Sraavan Reddy Mundlapudi
  • Patent number: 9900016
    Abstract: An apparatus for compensating for nonlinearities in a DAC caused by variabilities of a power supply. The apparatus may include a power supply, a processing component, and a front-end circuit. The power supply may generate power, where the power includes variabilities in a power. The processing component may generate a digital signal. The front-end circuit may be operatively coupled to the power supply and the processing component. The front-end circuit may receive the power from the power supply, identify the nonlinearities in the power, receive the digital signal from the processing component, and adjust the digital signal for the nonlinearities to obtain an input signal to send to a digital to analog converter (DAC).
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: February 20, 2018
    Assignee: Intel IP Corporation
    Inventors: Stefan Trampitsch, Daniel Gruber
  • Patent number: 9641211
    Abstract: A mobile communication device with an antenna is disclosed. A portion of a metal cover of the mobile communication device can function as an extension of a radiator of the antenna, and the installation of a pair of filters can prevent interference between the low frequency antenna and another antenna. The design of the present invention expands the sensing range of the antenna.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: May 2, 2017
    Assignee: PEGATRON CORPORATION
    Inventors: Chien-Yi Wu, Chi-Min Tang, Yu-Yao Chang, Hau-Yuen Tan, Tse-Hsuan Wang, Chao-Hsu Wu
  • Patent number: 9634773
    Abstract: A method for suppressing harmonic signals includes: mixing a first local oscillation signal with an input signal to obtain a first output signal, and mixing a second local oscillation signal with the input signal to obtain a second output signal, the first output signal including an n-order harmonic signal, n being a positive integer greater than 1; and adding the first output signal and the second output signal to suppress the n-order harmonic signal in the first output signal. The first local oscillation signal and the second local oscillation signal have different mark-space ratios but a same oscillation frequency.
    Type: Grant
    Filed: May 4, 2015
    Date of Patent: April 25, 2017
    Assignee: MSTAR SEMICONDUCTOR, INC.
    Inventors: Jun-Xiong Deng, Li-Wei Sheng
  • Patent number: 9634772
    Abstract: A harmonic suppression system, including an interface connector is connected to a common end of a first differential SPMT switch; a control port of the first differential SPMT switch is connected to a control port of a second differential SPMT switch, and a gating throw end of the first differential SPMT switch is separately connected to one end of each LC trap network in a one-to-one correspondence; the control port of the second differential SPMT switch is connected to a baseband chip, each gating throw end of the second differential SPMT switch is separately connected to the other end of each LC trap network in a one-to-one correspondence, and a common end of the second differential SPMT switch is connected to the baseband chip; the baseband chip is connected to an antenna switch; and the antenna switch is connected to a antenna.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: April 25, 2017
    Assignee: Huawei Device Co., Ltd.
    Inventors: Yongchao Wang, Hui Zhang, Feng Dong, Yajun Wang, Yueyun Cheng
  • Patent number: 9614285
    Abstract: An RFID antenna assembly configured to be energized with a carrier signal is disclosed. The RFID antenna assembly includes an inductive component including a loop antenna assembly, at least one capacitive component coupled to the inductive component, and an eddy current trap positioned a predetermined distance from the loop antenna assembly.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: April 4, 2017
    Assignee: DEKA Products Limited Partnership
    Inventor: David Blumberg, Jr.
  • Patent number: 9531419
    Abstract: Methods and systems are provided for multi-chip receivers with loop-through feeds. A receiver that comprises plurality of chips may receive one or more input feeds, with each of the chips generating a corresponding output comprising data (e.g., channels) extracted from the one or more input feeds. Only a first chip may handle reception and/or initial processing of the one or more input feeds, with each one of the remaining chips processing a loop-through feed generated in the first chip, in order to generate the corresponding output of that chip. The loop-through feed may be generated based on the one or more input feeds. In this regard, the loop-through feed may comprise at least one of the one or more input feeds that is partially processed in the first one of the plurality of chips.
    Type: Grant
    Filed: August 18, 2015
    Date of Patent: December 27, 2016
    Assignee: MAXLINEAR, INC.
    Inventors: Glenn Chang, Sridhar Ramesh, Curtis Ling
  • Patent number: 9350396
    Abstract: System and methods are provided for reducing signal distortion in wireless communication. An example system includes: an up-converter configured to generate a radio frequency signal based at least in part on a baseband signal for wireless communication and an oscillation signal; an amplifier configured to amplify the radio frequency signal and generate a transmission signal, the transmission signal including a first counter-intermodulation component associated with the up-converter and a second counter-intermodulation associated with the amplifier; and a signal generator configured to output a distortion-cancellation signal to the up-converter to reduce signal distortion associated with the first counter-intermodulation component and the second counter-intermodulation component.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: May 24, 2016
    Assignee: MARVELL WORLD TRADE LTD.
    Inventors: Peichen Jiang, Junxiong Deng, Taotao Yan
  • Patent number: 9331722
    Abstract: This document discusses apparatus and methods for compensating non-linearity of digital-to-time converters (DTCs). In an example, a wireless device can include a digital-to-time converter (DTC) configured to receive a phase data information from a baseband processor and to provide a first modulation signal for generating a wireless signal, a detector configure to receive the first modulation signal and provide an indication of nonlinearities of the DTC, and a pre-distortion module configured to provide pre-distortion information to the DTC using the indication of nonlinearities.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: May 3, 2016
    Assignee: Intel IP Corporation
    Inventors: Ashoke Ravi, Ofir Degani, Hasnain Lakdawala
  • Patent number: 9197465
    Abstract: System and method embodiments are provided for improving power efficiency in an outphasing amplifier with a non-isolating combiner. Some embodiments include a circuit comprising a signal decomposer configured to receive an input signal, a non-isolating combiner coupled to the signal decomposer and configured to provide an amplified output signal corresponding to the input signal, a first power amplifiers (PA) on a first branch between the signal decomposer and the non-isolating combiner, a second PA on a second branch between the signal decomposer and the non-isolating combiner, and a switch on the second branch between the signal decomposer and the second PA. The switch is configured to disconnect the second PA from the signal decomposer upon determining that the input signal is in a first condition, and further configured to connect the second PA to the signal decomposer upon determining otherwise.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: November 24, 2015
    Assignee: FUTUREWEI TECHNOLOGIES, INC.
    Inventors: Zhengxiang Ma, Munawar Kermalli
  • Patent number: 9184782
    Abstract: A high-frequency module includes first and second demultiplexers and a band elimination filter. The first and second demultiplexers include common terminals, transmission filters, and reception filters, respectively. In the band elimination filter, a demultiplexer-side terminal is connected to the common terminal of the first demultiplexer. The band elimination filter includes a first pass band, and a second pass band and a stop band that are located adjacent to each other within the first pass band. The band elimination filter is configured so that the second pass band includes the pass band of each of the transmission filter and the reception filter in the first demultiplexer and the stop band includes the pass band of the transmission filter in the second demultiplexer.
    Type: Grant
    Filed: February 7, 2013
    Date of Patent: November 10, 2015
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Yasumasa Taniguchi
  • Patent number: 9166446
    Abstract: A wireless power transmission controlling apparatus and method are provided. The apparatus includes a power amplifier that receives a source power, amplifies the received source power, and outputs a wireless power transmission signal from the amplified received source power, a band pass filter that filters the wireless power transmission signal, and passes a harmonic wave corresponding to a communication frequency band, and a communication unit that transmits a wireless power transmission control signal using the harmonic wave corresponding to the communication frequency band.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: October 20, 2015
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Woo-Ram Lee, Joon-Il Kim, Sung-Bum Park, Young-Min Lee, Hong-Kweun Kim, Se-Ho Park, Seung-Woo Han
  • Patent number: 9152273
    Abstract: Embodiments of the present disclosure disclose a terminal and method for controlling a screen. The method comprises: during a calling or call originating process of the terminal, determining whether a distance between a specified area and a human body is larger than a distance threshold value based on an electrical signal generated by the screen when the specified area of a screen of the terminal gets close to the human body; controlling the screen to be off if it is determined that the distance is not larger than the distance threshold value, and controlling the screen to be on if it is determined that the distance is larger than the distance threshold value. By adopting the technical solution disclosed in the embodiments of the present disclosure, the on and off status of the screen can be controlled more precisely during the calling or call originating process of the terminal.
    Type: Grant
    Filed: November 11, 2013
    Date of Patent: October 6, 2015
    Assignee: XIAOMI INC.
    Inventors: Xinming Shi, Hao Di, Wei Sun
  • Patent number: 9083294
    Abstract: System and method embodiments are provided for a multilevel outphasing amplifier architecture with a non-isolating or lossless combiner. The multilevel outphasing amplifier with lossless combiner improves power efficiency in comparison to outphasing amplifiers with lossless combiners. The multilevel outphasing amplifier applies different voltage levels to the power amplifiers (PAs) of the circuit according to the input signal power range. Additionally, tunable reactive compensation is applied to the compensation components (capacitor and inductor) of the lossless combiner as a function of the multilevel voltage setting of the PAs. The efficiency at the back-off region is improved by varying the compensation elements of the lossless combiner along with the drain voltage to the PAs as a function of the input signal power or amplitude.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: July 14, 2015
    Assignee: Futurewei Technologies, Inc.
    Inventor: Munawar Kermalli
  • Patent number: 9048978
    Abstract: The invention relates to a method and a system for generating clock signals in a wireless communication device. The method includes generating an uncorrected reference clock signal, generating at least one frequency correction value corresponding to a frequency error in the uncorrected reference clock signal, and generating at least one radio frequency clock signal based on the uncorrected clock signal and the at least one frequency correction value, for receiving and transmitting radio frequency signals. The method further comprise generating, independently of the at least one radio frequency clock signal, a baseband timing signal based on the uncorrected reference clock signal and the at least one frequency correction value, for clocking base-band signal processing circuits.
    Type: Grant
    Filed: July 5, 2011
    Date of Patent: June 2, 2015
    Assignee: TELEFONAKTIEBOLAGET L M ERISSON (PUBL)
    Inventor: Martin Isberg
  • Patent number: 9037100
    Abstract: A wireless transmitter for resolving gain mismatch of TV band is disclosed. In one embodiment, a wireless transmitter comprises a two-stage 14-path harmonic-rejection mixer to manage harmonic rejection ratio in lower sub-bands, and a two-stage 6-path harmonic-rejection mixer to manage harmonic rejection ratio in upper sub-bands. The gain mismatch is resolved by selecting gain ratios of the first and the second stage of the two-stage 14-path harmonic-rejection mixer and the two-stage 6-path harmonic-rejection mixer.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: May 19, 2015
    Assignee: UNIVERSITY OF MACAU
    Inventors: Ka-Fai Un, Pui-In Mak, Rui Paulo da Silva Martins
  • Patent number: 9037172
    Abstract: To schedule uplink transmission time slots for a collection of mobile communication devices, a set of base station target interference patterns is associated with base stations. A time slot target interference pattern is assigned for each time slot and it repeats after several time slots. The time slot target interference pattern in a given time slot specifies the interference allowed by each time slot to a given base station by any single mobile. A priority index may be determined for each time slot for each mobile associated with the particular base station. The priority index may be based, in part, on a determined correlation between the time-slot target interference patterns and a potential interference profile of a mobile to which a time slot is to be allocated. A mobile's throughput requirement, the throughput already received over a specified past duration, the system fairness requirement, as well as the amount of data available for transmission are also used for evaluating the priority index.
    Type: Grant
    Filed: February 6, 2013
    Date of Patent: May 19, 2015
    Assignee: APPLE INC.
    Inventors: Nimal Senarath, Kelvin Kar-Kin Au, Shalini Periyalwar
  • Publication number: 20150126140
    Abstract: A wireless transmitter for resolving gain mismatch of TV band is disclosed. In one embodiment, a wireless transmitter comprises a two-stage 14-path harmonic-rejection mixer to manage harmonic rejection ratio in lower sub-bands, and a two-stage 6-path harmonic-rejection mixer to manage harmonic rejection ratio in upper sub-bands. The gain mismatch is resolved by selecting gain ratios of the first and the second stage of the two-stage 14-path harmonic-rejection mixer and the two-stage 6-path harmonic-rejection mixer.
    Type: Application
    Filed: November 6, 2013
    Publication date: May 7, 2015
    Applicant: University of Macau
    Inventors: Ka-Fai UN, Pui-In MAK, Rui Paulo da Silva MARTINS
  • Publication number: 20150094004
    Abstract: Methods and apparatuses are presented for harmonic reject upconverting a baseband signal using at least one quadrature passive upconversion mixer. In some embodiments, an apparatus may include a first quadrature passive mixer configured to receive a first baseband input and a first LO input, and a second quadrature passive mixer configured to receive a second baseband input and a second LO input. A first output of said first passive mixer may be directly connected to a first output of said second passive mixer and together coupled to a first amplifier input. A second output of said first passive mixer may be directly connected to a second output of said second passive mixer and together coupled to a second amplifier input. The transmitter may be configured to output an upconverted signal with at least one rejected harmonic spurious mixing product based on the first and second amplifier inputs.
    Type: Application
    Filed: September 27, 2013
    Publication date: April 2, 2015
    Applicant: QUALCOMM Incorporated
    Inventors: Sameer Vasantlal VORA, Jeremy Darren DUNWORTH
  • Patent number: 8983406
    Abstract: This disclosure relates to a harmonic termination circuit that is separate from a load line. In one embodiment, the load line is configured to match an impedance at the power amplifier output at a fundamental frequency of the power amplifier output and the harmonic termination circuit is configured to terminate at a phase corresponding to a harmonic frequency of the power amplifier output. According to certain embodiments, the load line and the harmonic termination circuit can be electrically coupled to the power amplifier output external to a power amplifier die via different output pins of the power amplifier die.
    Type: Grant
    Filed: July 6, 2012
    Date of Patent: March 17, 2015
    Assignee: Skyworks Solutions, Inc.
    Inventors: Guohao Zhang, Hardik Bhupendra Modi, Dinhphuoc Vu Hoang
  • Publication number: 20150063175
    Abstract: According to an embodiment, a wireless communication apparatus includes a clock transmitting unit, a function circuit and a control unit. The clock transmitting unit is configured to transmit a clock signal through one of a plurality of transmission paths. The transmission paths are different from each other. The function circuit is configured to operate in synchronization with the clock signal transmitted by the clock transmitting unit. The control unit is configured to select one of the plurality of transmission paths according to an operation state of the wireless communication apparatus.
    Type: Application
    Filed: February 14, 2014
    Publication date: March 5, 2015
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Yoshiaki Yoshihara, Ryuichi Fujimoto
  • Patent number: 8965454
    Abstract: In one embodiment, an amplifier system has a tap, a delay filter, a linearized amplifier, and a hybrid combiner. The tapped portion of an input signal is amplified by the amplifier, the untapped portion of the input signal is delayed by the delay filter, and the combiner combines the resulting amplified, tapped portion and the delayed, untapped portion to generate an amplified output signal. By re-combining the delayed, untapped portion of the input signal with the amplified, tapped portion, the power of the untapped portion is not lost, and the amplifier does not have to compensate for all of the distortion that would otherwise be associated with the total output power level. Such an amplifier system is applicable, for example, in upgrading an existing GSM cell site to support both GSM communications as well as UMTS communications without degrading GSM operations.
    Type: Grant
    Filed: March 4, 2009
    Date of Patent: February 24, 2015
    Assignee: Andrew LLC
    Inventors: George P. Vella-Coleiro, Josef Ocenasek, Jeffrey G. Strahler, Christopher F. Zappala
  • Patent number: 8948711
    Abstract: An apparatus and method determine a dielectric access in a portable terminal. The method includes generating a TX signal of a specific frequency band by performing frequency conversion, modulation, and digital/analog conversion. The method also includes detecting the power of the TX signal and converting the detected power using Analog-to-Digital Conversion (ADC). The method further includes loading an ADC table defining values for determining the approach/withdrawal of a dielectric to/from the portable terminal, and comparing the power of the TX signal and the ADC table to determine the approach/withdrawal of a dielectric to/from the portable terminal.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: February 3, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Chang-Kyun Kang
  • Patent number: 8942649
    Abstract: A method is provided for reducing non-linear effects in an electronic circuit including an amplifier. The method may include receiving a modulated signal at an input of the amplifier, the modulated signal comprising a baseband signal modulated by an oscillator frequency. The method may further include substantially attenuating counter-intermodulation in the modulated signal caused by harmonics of the oscillator frequency and the baseband signal by a resonant circuit. In some embodiments, the resonant circuit may include at least one inductive element and one capacitive element coupled to the at least one inductive element, the at least one inductive element and the at least one capacitive element configured to substantially attenuate counter-intermodulation in the modulated signal.
    Type: Grant
    Filed: August 16, 2013
    Date of Patent: January 27, 2015
    Assignee: Intel IP Corporation
    Inventor: Omid Oliaei
  • Patent number: 8913968
    Abstract: A transmitter includes a power amplifier driver to amplify a communication signal and a mixer connected with the power amplifier driver, the mixer to output the communication signal to the power amplifier driver. A capacitor and an inductor connect with the mixer and the power amplifier driver. The capacitor and the inductor create a resonant frequency to attenuate frequency components around a determined order of a local oscillator signal.
    Type: Grant
    Filed: November 8, 2012
    Date of Patent: December 16, 2014
    Assignee: Broadcom Corporation
    Inventors: Ahmad Mirzaei, Hooman Darabi
  • Patent number: 8903002
    Abstract: A computational processor uses a binary signal, being a set of 1- or 0-valued elements of a same number as a number of elements in an input signal, to generate computational data whose elements are exclusive OR values between each element of the input signal and a corresponding element in the binary signal at a same position. The modulator 13 modulates the input signal and the computational data according to a primary modulation scheme, and generates primary-modulated signals. An IFFT calculator applies an inverse fast Fourier transformation to the primary-modulated signals to generate inverse transformation data. A transmitter generates a baseband signal based on generated inverse transformation data whose peak-to-average power ratio matches a standard, and generates and transmits a transmission signal from the baseband signal and data specifying computations conducted to generate the inverse transformation data that matches the standard.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: December 2, 2014
    Assignee: Icom Incorporated
    Inventor: Nobuyoshi Nishikawa
  • Patent number: 8874031
    Abstract: There is provided a radio power transmitting apparatus including: a power transmitting coil, a band signal generating unit, a reflected signal measuring unit, an oscillator and a communication control unit. The coil is supplied with a signal and transmits the signal to a power receiving coil on a radio power receiving apparatus through magnetic coupling. The generating unit generates a band signal having an allowable transmission band and supplies the band signal to the power transmitting coil. The reflected signal measuring unit measures a reflected signal of the band signal from the power transmitting coil. The oscillator generates a carrier signal having a controllable oscillating frequency. The control unit determines a transmission frequency based on a frequency characteristic of the reflected signal and performs control so that a transmission signal generated by modulating the carrier signal of the transmission frequency is supplied to the power transmitting coil.
    Type: Grant
    Filed: February 16, 2012
    Date of Patent: October 28, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiroki Kudo, Noritaka Deguchi, Daisuke Takeda, Ren Sakata, Hiroki Shoki
  • Patent number: 8868012
    Abstract: A frequency-multiplied harmonic suppression RF circuit design method includes the steps of defining respective operating frequencies of predetermined major electronic components of the RF circuit to be designed, using these operating frequencies to calculate the values of respective frequency-multiplied harmonics and intermodulation distorsions, designing respective filters subject to the values of the frequency-multiplied harmonics and intermodulation distorsions obtained, calculating the locations of the frequency-multiplied harmonics in the RF circuit under design, installing the designed filters in the calculated locations, and testing and adjusting the installed filters.
    Type: Grant
    Filed: August 5, 2013
    Date of Patent: October 21, 2014
    Assignee: Shun-Fu Technology Corp.
    Inventor: Yung-Sheng Huang
  • Patent number: 8868011
    Abstract: Embodiments of apparatuses, methods, and systems for a radio frequency amplification circuit providing for fast loadline modulation are generally described herein. Other embodiments may be described and claimed.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: October 21, 2014
    Assignee: TriQuint Semiconductor, Inc.
    Inventor: Peter V. Wright
  • Patent number: 8855585
    Abstract: Apparatus and methods are disclosed related to low-voltage radio transmitters with high spectral purity. One such apparatus includes a baseband path with a predistortion stage, a programmable filter, and an upconverter core. In an embodiment, the programmable filter is placed between the predistortion stage and the upconverter core. In an embodiment, the programmable filter is configured by a controller to reject out-of-band noise introduced at the predistortion stage or earlier.
    Type: Grant
    Filed: August 2, 2010
    Date of Patent: October 7, 2014
    Assignee: Analog Devices, Inc.
    Inventor: Antonio Montalvo
  • Patent number: 8855584
    Abstract: The present disclosure relates to transmission circuitry of a wireless communication device. The transmission circuitry includes power amplifier circuitry, an output matching network, and impedance control circuitry. The power amplifier circuitry amplifies a radio frequency (RF) input signal to provide an amplified RF output signal, which is passed through the output matching network and transmitted via one or more antennas. As the center frequency of the RF input signal and conditions of operating parameters change, the impedance control circuitry adjusts the values of one or more variable impedance elements of the output matching network in a desired fashion. The values of the variable impedance elements are adjusted such that the output matching network concurrently and dynamically presents the desired load impedances at the center frequency and at one or more harmonics of the RF input signal to achieve a given performance specification.
    Type: Grant
    Filed: November 12, 2013
    Date of Patent: October 7, 2014
    Assignee: Cree, Inc.
    Inventors: Christopher Harris, Raymond S. Pengelly
  • Patent number: 8855548
    Abstract: This invention discloses a method of communicating with a user including wirelessly broadcasting content which is accessible to a multiplicity of users and which includes at least some non-audio content which is not visible to the users without user actuation and which includes product-specific information, enabling a user to select a portion of the content, responsive to a selection by the user, capturing at least part of the non-audio content, corresponding to the portion of the content selected by the user and employing at least part of the captured content to access a contact using a mobile communicator by initially establishing contact with a non product-specific communication facility and employing product-specific information contained in the non-audio content. A system for communicating with a user is also disclosed.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: October 7, 2014
    Assignee: Nokia Corporation
    Inventors: Michael L. Kagan, David Kamien, Ian Elkan Gamse, Charles Anthony Rose
  • Patent number: 8818259
    Abstract: The present invention relates to methods and arrangements that enable easy integration of on/off repeaters in a radio access network and a minimized signaling for the UE repeater selection. This is achieved by a solution where the RBSs are working in a pre-coding mode and where the repeaters are measuring the downlink reference signals, selecting pre-coding matrices and feeding the index of selection back (i.e. the PMI) to the RBS, in analogy with what a UE does. This allows the RBS to distinguish the UE repeater selection, without introducing any extra uplink report or interaction between UEs and repeaters, by comparing the index from the UE with the indices from different repeaters.
    Type: Grant
    Filed: September 5, 2008
    Date of Patent: August 26, 2014
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Qingyu Miao, Lei Wan
  • Patent number: 8818302
    Abstract: Tank circuitry coupled to the output terminals of a differential power amplifier includes two trap circuits configured to divert harmonic signals away from the output terminals. A tank inductor is provided to form a tank circuit in conjunction with each one of the trap circuits. At certain harmonic frequencies of the input signal to the differential power amplifier, the trap circuits are resonant and present a substantially low impedance path to ground, thereby diverting harmonic signals away from the output terminals of the differential power amplifier. At the fundamental frequency of the input signal to the differential power amplifier, the trap circuits are resonant with the tank inductor and present a substantially high impedance compared to the load impedance presented at the output terminals of the differential power amplifier, thereby reducing the loading effect of the trap circuits at the fundamental frequency.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: August 26, 2014
    Assignee: RF Micro Devices, Inc.
    Inventor: Ali Tombak
  • Patent number: 8818303
    Abstract: The present disclosure relates to transmission circuitry of a wireless communication device. The transmission circuitry includes power amplifier circuitry, an output matching network, and impedance control circuitry. The power amplifier circuitry amplifies a radio frequency (RF) input signal to provide an amplified RF output signal, which is passed through the output matching network and transmitted via one or more antennas. As the center frequency of the RF input signal and conditions of operating parameters change, the impedance control circuitry adjusts the values of one or more variable impedance elements of the output matching network in a desired fashion. The values of the variable impedance elements are adjusted such that the output matching network concurrently and dynamically presents the desired load impedances at the center frequency and at one or more harmonics of the RF input signal to achieve a given performance specification.
    Type: Grant
    Filed: November 12, 2013
    Date of Patent: August 26, 2014
    Assignee: Cree, Inc.
    Inventors: Christopher Harris, Raymond S. Pengelly
  • Patent number: 8774316
    Abstract: A transmitter includes an input, a modulator, and a calibration memory configured to store discrete calibration test points. A compensator is coupled between the input and the modulator and cooperates with the calibration memory to cause the modulator to generate a respective calibration carrier signal for each of the discrete calibration test points during a calibration phase. A detector is coupled to an output of the modulator and is configured to determine respective calibration values of the calibration carrier signals during the calibration phase. A compensator calculator is coupled to an output of the detector, and is configured to generate compensation values for the compensator for use during an operation phase and based on the calibration values of the calibration carrier signals.
    Type: Grant
    Filed: July 13, 2011
    Date of Patent: July 8, 2014
    Assignee: Harris Corporation
    Inventors: Mark W. Thompson, Robert E. Daminski, Brian C. Padalino
  • Patent number: 8755751
    Abstract: A wireless telecommunication apparatus comprising—a baseband for the purpose of generating and receiving base-band signals; —a RF transceiver for the purpose of transmitting and receiving a RF signals, —at least one centralized clock derived from at least one central oscillator; —at least one individual element located within said apparatus and having a EMI coupling with said RF transceiver, and which clocking is likely to generate spurs being modulated with the Tx carrier of said RF transceiver; Characterized in that it further includes: —a least one controllable clocking system for said at least one individual element; —a general control unit (UCM) for the purpose of performing a contextual analysis of the current mode of operation of said wireless telecommunications and, in response to said contextual analysis, for determining a clocking frequency which results in modulated Tx clock spurs out of the receive bands.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: June 17, 2014
    Assignee: ST-Ericsson SA
    Inventors: Dominique Brunel, Laurent Noel
  • Patent number: 8750417
    Abstract: A communications device, in one aspect as a portable wireless communications device, includes an in-phase modulator and power amplifier that receives a baseband I signal and modulates and amplifies the I signal. A quadrature modulator and power amplifier receives a baseband Q signal and modulates and amplifies the Q signal. A power combiner sums and outputs the I and Q signals. An I demodulator circuit receives a signal fed back from the I power amplifier and demodulates the fed back signal to produce demodulated I signals. A Q demodulator circuit receives a signal fed back from the Q power amplifier and demodulates the fed back signal to produce demodulated Q signals. A processor compares the digital, baseband I and Q signals with a demodulated I and Q signals to compensate for amplitude, frequency and phase modulation errors.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: June 10, 2014
    Assignee: BlackBerry Limited
    Inventors: Lizhong Zhu, George Soliman Mankaruse, Michael Stephen Corrigan, Perry Jarmuszewski, Oleksiy Kravets, Kent Arnold Nickerson, Nagula Tharma Sangary
  • Publication number: 20140155005
    Abstract: A mobile wireless communications device includes a housing, antenna, and circuit board carried by the housing and having radio frequency (RF) circuitry operative with the antenna for receiving and transmitting RF signals through the antenna. A power amplifier is connected within a transmission line for amplifying RF signals to be transmitted over the transmission line to the antenna. An antenna switch is connected to the antenna and RF circuitry. An RF shield surrounds the power amplifier and antenna switch and isolates the power amplifier and antenna switch from the antenna and RF circuitry. A low pass filter is connected to the power amplifier and antenna switch for reducing any RF coupling of voltage standing waves of upper harmonic frequencies from the power amplifier into the antenna switch through the RF shield while maintaining transmission of signals through the transmission line at a desired fundamental frequency.
    Type: Application
    Filed: December 2, 2013
    Publication date: June 5, 2014
    Applicant: BLACKBERRY LIMITED
    Inventors: LIZHONG ZHU, GEORGE SOLIMAN MANKARUSE, MICHAEL STEPHEN CORRIGAN
  • Patent number: 8744378
    Abstract: A radio frequency (RF) transmitter is provided. The RF transmitter includes first and second drivers that are configured to receive first and second sets of complementary RF signals. Restoration circuits are coupled to the first and second drivers, and a bridge circuit is coupled to the first and second restoration circuits. By having the restoration circuits and the bridge circuit, a common mode impedance and a differential impedance can be provided, where the common mode impedance is lower than the differential impedance.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: June 3, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Joonhoi Hur, Rahmi Hezar, Lei Ding, Baher S. Haroun
  • Patent number: 8737934
    Abstract: A programmable controller and software that monitors periods an RF transmitter is active and a output power level during those periods of activity. These two values are multiplied together and accumulated over time to provide a value for the RF emissions for some period. A limit is set for the RF emissions for any period and if the RF emissions exceeds (or is expected to exceed given the current rate) the set limit, the system limits the subsequent emissions to not exceed the set limit. This reduction in emissions rate come at the cost of a small performance reduction.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: May 27, 2014
    Assignee: Symbol Technologies, Inc.
    Inventors: Russell Calvarese, Robert Sandler, Thomas Wulff
  • Patent number: 8731490
    Abstract: In transmitter modules or power amplifier (PA) modules there is at least a possible path for a second and even a third harmonic of a low band to crossover unfiltered into the high band path and reach the antenna and hence cross band isolation is necessary. Forward isolation is necessary in order to limit the input crossing over the PAs into the antenna port. According to the methods and the circuits such cross band isolation and forward isolation is improved by detuning the filter and matching network at the output of the PA. The circuit comprises a trap at the harmonic frequencies of the low band thereby at least reducing the impacts of the cross band and forward isolation.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: May 20, 2014
    Assignee: RF Micro Devices (Cayman Islands), Ltd.
    Inventors: Malcolm Smith, Ying Shi
  • Patent number: 8718576
    Abstract: A radio frequency (RF) modulator includes: converting means for up-converting a first and second baseband signals into a first and second up-converted signals with a reference clock, wherein a phase difference between the first and second baseband signals substantially equals 180°/N; and combining means for combining the first and second up-converted signals to generate an output signal.
    Type: Grant
    Filed: February 11, 2010
    Date of Patent: May 6, 2014
    Assignee: Mediatek Inc.
    Inventor: Chih-Hao Sun
  • Patent number: 8707079
    Abstract: A semiconductor device comprising an interface logic module for transmitting data frames across an interface, and controller logic module arranged to control a rate at which the interface logic transmits data across the interface. Upon receipt of data frames to transmit across the interface, the controller logic module is arranged to determine a sequence of data rates with which to transmit sequential data frames across the interface, and to configure the transmission of the data frames across the interface according to the determined data rate sequence. The selection of these data rates will be dependent on specific critical RF frequencies where EMI impacts have to be minimized.
    Type: Grant
    Filed: September 4, 2008
    Date of Patent: April 22, 2014
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Michael O'brien, Paul Kelleher, Conor O'keeffe
  • Patent number: 8693577
    Abstract: A receiver operatively coupled to an antenna structure capable of receiving a first plurality of RF signals is disclosed herein. The receiver includes an RF processing network operative to perform weighting and combining operations within the RF domain using the first plurality of RF signals so as to produce a second plurality of RF signals. Also provided is a downconverter configured to downconvert the second plurality of RF signals into a second plurality of down-converted signals. In alternate implementations certain of the weighting and combining operations are performed at baseband and the remainder effected within the RF domain. A transmitter of corresponding architecture is also disclosed.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: April 8, 2014
    Assignee: Broadcom Corporation
    Inventors: Severine Catreux, Vinko Erceg, Pieter Roux, Pieter Van Rooyen, Jack Winters
  • Patent number: 8682315
    Abstract: A system comprising a pre-power amplifier and a hardware device which is configured to predistort an amplitude input signal by comparing interpolated data places, determined by comparing the input signal with data from a LUT, coming from a LUT with the amplitude input signal and choosing the closest input data place to the amplitude input signal to produce an amplitude predistortion output signal. The LUT contains predistortion data associated with the pre-power amplifier. The amplitude input signal is multiplied and scaled prior to being compared with the data in the LUT. A second LUT is used to predistort a phase input signal and the phase predistortion output signal is combined in the pre-power amplifier with the amplitude predistortion output signal. The system may be implemented in a mobile communications device.
    Type: Grant
    Filed: December 18, 2007
    Date of Patent: March 25, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Jaimin A. Mehta, Vasile Zoicas, Sameh Rezeq
  • Publication number: 20140065988
    Abstract: A frequency-multiplied harmonic suppression RF circuit design method includes the steps of defining respective operating frequencies of predetermined major electronic components of the RF circuit to be designed, using these operating frequencies to calculate the values of respective frequency-multiplied harmonics and intermodulation distorsions, designing respective filters subject to the values of the frequency-multiplied harmonics and intermodulation distorsions obtained, calculating the locations of the frequency-multiplied harmonics in the RF circuit under design, installing the designed filters in the calculated locations, and testing and adjusting the installed filters.
    Type: Application
    Filed: August 5, 2013
    Publication date: March 6, 2014
    Applicant: Shun-Fu Technology Corp.
    Inventor: Yung-Sheng HUANG