Gain Control Patents (Class 455/127.2)
  • Patent number: 10778157
    Abstract: An RF receiver circuit configuration and design limited by conditions and frequencies to simultaneously provide steady state low-noise signal amplification, frequency down-conversion and image signal rejection. The invention provides combined circuits of an RF transceiver architecture that measure antenna reflected power relative to forward power using the error amplifier signal to adjust the gain of the variable gain amplifier in order to compensate for the mismatch between forward reflected power and forward power at the antenna in order to achieve constant radiated power. The RF receiver circuit may be implemented as one of a CMOS single chip device or as part of an integrated system of CMOS components.
    Type: Grant
    Filed: December 12, 2019
    Date of Patent: September 15, 2020
    Assignee: Berex, Inc.
    Inventors: Oleksandr Gorbachov, Lisette L. Zhang
  • Patent number: 10747361
    Abstract: The control device includes a touch sensor circuit, a control circuit, a driving circuit and a switching circuit. The touch sensor circuit is configured to generate a touch signal and a function signal in response to a touch state of a touch component. The control circuit is activated by a first voltage. The control circuit selectivity generates a self-holding signal according to the function signal when it is activated. The driving circuit is configured to generate a drive signal according to the touch signal or the self-holding signal. The switch circuit is turned on by the drive signal so as to provide the first voltage to the control circuit by the turned-on switching circuit. When the control circuit generated the self-holding signal, the control circuit is configured to continuously transmit the self-holding signal to the driving circuit according to the function signal during a first enabling period.
    Type: Grant
    Filed: July 1, 2019
    Date of Patent: August 18, 2020
    Assignee: DELTA ELECTRONICS INC.
    Inventors: Tsung-Ting Wu, Si-Wei Chen
  • Patent number: 10680685
    Abstract: Radio network node and method therein, for communication in a wireless communication system. The radio network node comprises: a plurality of antenna elements, a plurality of transceivers, wherein the plurality of transceivers comprise a first subset of the plurality of transceivers coupled to a first subset of the plurality of antenna elements and a second subset of the plurality of transceivers coupled to a second subset of the plurality of antenna elements; and a controller configured to adjust the first subset of the transceivers to work at a first frequency band, and to adjust the second subset of the transceivers to work at a second frequency band.
    Type: Grant
    Filed: March 1, 2019
    Date of Patent: June 9, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Mats Högberg, Björn Sihlbom, Ulrik Imberg, Tomas Wilhelmsson, Teijo Henrikki Lehtinen, Yajun Jiang
  • Patent number: 10642302
    Abstract: An apparatus for generating a substantially constant DC reference voltage. The apparatus includes a reference voltage generator configured to generate a substantially constant direct current (DC) reference voltage based on a voltage on a data signal transmission line, wherein the voltage is based on a bandgap reference voltage. In one implementation, the data signal transmission line is a differential signal transmission line and the voltage is a common mode voltage. In another implementation, the data signal transmission line is an I-data signal transmission line and a Q-data signal transmission line, and the voltage is an average or weighted-average of the common mode voltages of the I- and Q-differential signals. In another implementation, the reference voltage is based on a single-ended (e.g., positive- and/or negative)-component or vice-versa of I- and Q-data signals, respectively.
    Type: Grant
    Filed: April 18, 2019
    Date of Patent: May 5, 2020
    Assignee: QUALCOMM Incorporated
    Inventors: Balasubramanian Sivakumar, Dinesh Jagannath Alladi, Kentaro Yamamoto, Sean Baker, Liang Zhao
  • Patent number: 10594346
    Abstract: A method for attenuating interference generated by intermodulation products with respect to a multiplexed radio signal having a desired frequency the method includes implementing an automatic gain control having a gain setpoint configurable between a first setpoint and a second setpoint lower than the first setpoint; configuring the automatic gain control so that the gain setpoint is equal to the first setpoint; detecting the presence of co-channel interference at the desired frequency; if co-channel interference is detected at the desired frequency, then, if the automatic gain control is active, configuring it so that the gain setpoint is equal to the second setpoint and, if the automatic gain control is not active, configuring it so that the gain setpoint is equal to the first setpoint.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: March 17, 2020
    Assignees: Continental Automotive France, Continental Automotive GmbH
    Inventors: Laurent Théry, Chao Lin
  • Patent number: 10560140
    Abstract: A MIMO wireless transceiver includes: antennas, components forming transmit and receive chains coupled to the antennas, a signal combiner, and a predistortion calibration circuit. The transmit chain components include: pre-distorter circuits and power amplifiers (PA)s, The pre-distorter circuits each couple to a transmit chain for pre-distorting an associated signal thereon. The PAs are input coupled to a corresponding transmit chain and output coupled to a corresponding antenna. The signal combiner combines the amplified signals from all of the PAs into a combined output signal.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: February 11, 2020
    Assignee: QUANTENNA COMMUNICATIONS, INC.
    Inventors: Songping Wu, Hossein Dehghan, Abhishek Kumar Agrawal
  • Patent number: 10516406
    Abstract: A digital-to-analog converter (DAC) linearization system can include a DAC configured to generate an analog output signal based on a digital input signal, a detector configured to detect noise on a supply voltage and generate a noise detection signal based on the detected noise, and a compensator that is configured to generate a compensated analog signal based on the analog output signal and the noise detection signal.
    Type: Grant
    Filed: December 27, 2018
    Date of Patent: December 24, 2019
    Assignee: Intel Corporation
    Inventor: Franz Kuttner
  • Patent number: 10473532
    Abstract: A method for use in an electronic device having an amplification unit, the method comprising: detecting a current temperature of the electronic device when the amplification unit is in a first state in which the amplification unit is operated in accordance with first control value; detecting whether the current temperature meets a threshold; identifying a second control value that is lower than the first control value, when the current temperature meets the threshold; and changing an amount of power supplied to the amplification unit by transitioning the amplification unit into a second state in which the amplification unit is operated in accordance with the second control value.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: November 12, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jongwon Yum
  • Patent number: 10444353
    Abstract: An imaging system that utilizes deterministic bit sequences modulated onto an in-phase component of a carrier frequency and continuously transmitted via a transducer and received for imaging a medium and/or environment is provided. The received signal is demodulated by an in-phase demodulator and a quadrature demodulator and the demodulated components are processed to provide a spatial mapping of a medium or environment being imaged.
    Type: Grant
    Filed: November 24, 2017
    Date of Patent: October 15, 2019
    Assignee: 8517401 Canada Inc.
    Inventor: Christopher John Leskiw
  • Patent number: 10396833
    Abstract: A radio frequency front end circuit includes an output signal transmission line, an amplifier circuit with an input connected to a radio frequency signal source and an output connected to the output signal transmission line. A harmonic suppression circuit is connected to the amplifier circuit, and includes an active circuit element having a frequency-dependent impedance and is tuned as a reflective trap with a negative capacitance for one or more rejection frequency ranges each corresponding to a multiple of a fundamental frequency of a signal generated by the radio frequency signal source.
    Type: Grant
    Filed: October 8, 2018
    Date of Patent: August 27, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Oleksandr Gorbachov, Lisette L. Zhang, Lothar Musiol
  • Patent number: 10312921
    Abstract: A system and method of reducing the flicker noise of frequency synthesizers is disclosed. The current source for the synthesizer charge pump current source is modulated so that its flicker noise is displaced to a higher offset frequency. This allows the flicker noise to be filter or nulled out by, for example, a notch filter. The flicker noise can also be modulated into a spread spectrum utilizing sigma delta modulation.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: June 4, 2019
    Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventor: Peter Cheng
  • Patent number: 10291295
    Abstract: Certain aspects involve selectively combining uplink transmissions in a distributed antenna system (“DAS”). For example, a unit of the DAS can receive baseband uplink transmissions from remote units of the DAS via a first channel and a second channel. The unit can generate a first combined uplink signal by combining baseband uplink transmissions received from a first subset of the remote units via the first channel that include data for transmission to a base station. The unit can generate a second combined uplink signal that includes baseband uplink transmissions received from a second subset of the remote units via the second channel and excludes or attenuates baseband uplink transmissions that are received from the first subset of the remote units via the second channel and that lack data for transmission to the base station are excluded or attenuated. The unit can transmit the combined uplink signals to the base station.
    Type: Grant
    Filed: February 20, 2017
    Date of Patent: May 14, 2019
    Assignee: CommScope Technologies LLC
    Inventors: Van E. Hanson, Christopher Goodman Ranson
  • Patent number: 10291291
    Abstract: A contactless communication device includes a receiver unit having differential input terminals for connecting to an antenna. The receiver unit is coupled to a transmitting device and receives an RF signal transmitted by the transmitting device. A first comparator is adapted to generate a first comparator output signal indicative of a relationship between a voltage at a positive input terminal of the receiver unit and a first reference voltage. A second comparator is adapted to generate a second comparator output signal indicative of a relationship between a voltage at a negative input terminal of the receiver unit and a second reference voltage. A first voltage regulation circuit is adapted to regulate the voltage at the positive input terminal in response to the first comparator output signal. A second voltage regulation circuit is adapted to regulate the voltage at the negative input terminal in response to the second comparator output signal.
    Type: Grant
    Filed: July 11, 2017
    Date of Patent: May 14, 2019
    Assignee: NXP B.V.
    Inventors: Jingfeng Ding, Gernot Hueber, Stefan Mendel
  • Patent number: 10284235
    Abstract: Disclosed herein are wireless transceivers with switches to reduce harmonic leakage. In some embodiments, a transmitter system includes a power amplification system including a first power amplifier configured to amplify a signal at a first cellular frequency band and a second power amplifier configured to amplify a signal at a second cellular frequency band. The transmitter includes a switch coupled between an output of the second power amplifier and a ground potential. The transmitter includes a controller configured to, based on a band select signal, control the switch and selectively enable or disable each of the first power amplifier and the second power amplifier. Selective control of the switch can reduce harmonic leakage compared to a system that does not include the disclosed switches and controls.
    Type: Grant
    Filed: July 20, 2016
    Date of Patent: May 7, 2019
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventors: Philip H. Thompson, Steven T. Seiz, Roman Zbigniew Arkiszewski, Matthew Lee Banowetz, Duane A. Green
  • Patent number: 10278089
    Abstract: A method for determining a center frequency in an unlicensed frequency band to use for downlink communication in a cellular network. The method is performed in a network node and comprises the steps of: performing a coarse pre-scan when the network node is in a transmit time slot, yielding respective coarse measurement of signal levels for a plurality of frequencies in the unlicensed frequency band; performing an accurate measurement when the network node is in a receive time slot, yielding respective accurate measurement of signal levels for a plurality of frequencies in the unlicensed frequency band; and determining at least one frequency to use as a center frequency for a downlink communication channel in the unlicensed frequency band.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: April 30, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Kauko Heinikoski, Marko E Leinonen
  • Patent number: 10224977
    Abstract: In an embodiment, an apparatus includes a first radio frequency (RF) signal path and a second RF signal path. The first RF signal path can provide a first RF signal when active and the second RF signal path can provide a second RF signal when active. The second RF signal path can include a matching network with a load impedance configured to prevent a resonance in the second RF signal path due to coupling with the first RF signal path when the first RF signal path is active.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: March 5, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Weimin Sun, David Viveiros, Jr., Russ Alan Reisner
  • Patent number: 10177838
    Abstract: The systems and processes described herein can reduce the footprint of the internal devices of a wireless device by combining the DC-DC supply regulator with a FEM. Further, the device footprint can be further reduced by sharing the integrated DC-DC supply regulator among multiple FEMs reducing or eliminating the use of a separate DC-DC supply regulator for each FEM of a wireless device. Moreover, in certain embodiments, by integrating the DC-DC supply regulator into a 2G FEM, power efficiency can be improved for some wireless devices. For example, the DC-DC supply regulator may be used to supply power to a PA used for high-band 2G transmission functions. Using the DC-DC supply regulator can improve power efficiency compared to systems that supply the power for the high-band 2G PA directly from the power supply (e.g., the battery).
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: January 8, 2019
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventor: David Steven Ripley
  • Patent number: 10064119
    Abstract: An attenuation device inclusive of radio frequency (RF) absorber materials to reduce signal power in transmission systems involved in short range communication systems is described. The attenuation device is placed between a radio transmitter and an antenna in a transmission system. The attenuation device may be coated with protective material, and may have small dimensions such that the organization and dimensions of the transmission system are not significantly modified. The attenuation device reduces the power of a signal to be transmitted to a receiver, and has a good return loss indicative of a relatively low mismatch with the antenna.
    Type: Grant
    Filed: December 27, 2016
    Date of Patent: August 28, 2018
    Assignee: Google LLC
    Inventors: Timothy Michael O'Connor, Toktam Nezakati Esmaeelzadeh, Siyuan Xin, Robert John Schlaefli
  • Patent number: 9939521
    Abstract: Provided are apparatus and methods for ranging between a plurality of wireless devices. An exemplary method includes, at a first wireless device, transmitting a primary portion symbol comprising a first packet and transmitting a secondary portion symbol. The secondary portion symbol is transmitted simultaneously at a lower transmit power than the primary portion symbol, and the secondary portion symbol comprises a second packet identical to the first packet. The primary portion symbol can be transmitted in a first channel having a substantially 20 MHZ bandwidth and the secondary portion can be transmitted in a second channel having a substantially 20 MHZ bandwidth. The first and second channels are substantially adjacent in frequency. After transmitting the primary portion symbol, for example, a high-throughput long-training-field symbol or a very-high-throughput long-training-field symbol can be repetitively transmitted.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: April 10, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Jubin Jose, Xinzhou Wu, Thomas Joseph Richardson
  • Patent number: 9894615
    Abstract: A method, system, and device provide power-efficient communications within the context of available power. Transmission and receipt data rates are scalable in accordance with output power available from a power source. Data is transmitted at a data rate determined, at least in part, by the available output power.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: February 13, 2018
    Assignee: SUNRISE MICRO DEVICES, INC.
    Inventors: Edgar H. Callaway, Jr., Paul E. Gorday
  • Patent number: 9813273
    Abstract: A peak suppression device includes an acquiring unit that acquires multiple envelopes of carrier signals that are included in a multicarrier signal, an adding unit that adds the envelopes to generate a combined envelope, a detecting unit that detects a peak value and a peak timing of the multicarrier signal by using the combined envelope, and a suppressing unit that suppresses a peak of the multicarrier signal in accordance with the peak value and the peak timing.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: November 7, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Hiroyoshi Ishikawa, Toshio Kawasaki, Hikaru Ishikawa, Kazuo Nagatani
  • Patent number: 9781611
    Abstract: A device includes a receiver, a determiner, and a demodulator. The receiver is configured to receive from a base station a reference signal having a power level such that a sum of the power level and a processing gain of a channel estimator of the device corresponds to a predetermined demodulation penalty for the device. The determiner is configured to determine the power level. The demodulator is configured to demodulate a data signal received from the base station based on the power level and a channel estimate generated based on the reference signal.
    Type: Grant
    Filed: March 26, 2013
    Date of Patent: October 3, 2017
    Assignee: Marvell World Trade LTD.
    Inventor: Daniel Yellin
  • Patent number: 9761280
    Abstract: A power path controller included in a system-on-chip (SoC) is provided. The power path controller is coupled to a first power source and a second power source. The power path controller includes a first switch located between the first power source and a memory core included in the SoC, a second switch located between the second power source and the memory core, a comparator configured to compare a first power supply voltage supplied from the first power source with a second power supply voltage supplied from the second power source, and a switch controller configured to selectively activate the first switch or the second switch according to a comparison result of the comparator.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: September 12, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Se-Ki Kim, Dae-Yong Kim, Dong-Hun Heo
  • Patent number: 9621286
    Abstract: A signal generation system can include an input source configured to provide an input radio frequency (RF) signal, a correction filter calculation (CFC) block configured to determine correction filter parameters, and an automatic level control (ALC) loop configured to provide ALC loop information to the CFC block. The correction filter parameters may be determined based at least in part on the ALC information. The system can also include a predistortion field programmable gate array (FPGA) configured to apply a correction filter to the input RF signal, wherein the correction filter is based at least in part on the correction filter parameters, and an RF output configured to provide an RF output signal.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: April 11, 2017
    Assignee: Tektronix, Inc.
    Inventor: Jeffrey D. Earls
  • Patent number: 9615334
    Abstract: An electronic device includes a communication interface configured to establish a communication channel; and a controller configured to adjust an amplification current of a signal outputted through the communication channel corresponding to a measured Adjacent channel leakage ratio (ACLR) based on the communication channel, wherein the controller is configured to adjust a size of the amplification current corresponding to a difference between the measured ACLR and a specified condition.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: April 4, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD
    Inventors: Jung Hyung Kim, Jung Joon Kim, Ju Ho Van, Yu Seon Lee
  • Patent number: 9538471
    Abstract: Computing devices can utilize various low power wakeup transceivers in order to control functional states of various components of those devices. Each transceiver can broadcast a beacon including appropriate information, which can be received by any other device with a transceiver that is within a propagation range of the beacon. A transceiver receiving the beacon can cause the received beacon to be analyzed by appropriate decision logic, which can determine any appropriate functionality to be activated or otherwise contacted in response to the beacon. In at least some embodiments, the beacon can cause another type of communication channel to be activated to establish communications with a device from which the beacon was received. In this way, the communications channel can be established without having to leave the channel active or manually activate that channel.
    Type: Grant
    Filed: September 3, 2013
    Date of Patent: January 3, 2017
    Assignee: Amazon Technologies, Inc.
    Inventors: Andrew D. Price, Varadarajan Gopalakrishnan, Robert D. Lau
  • Patent number: 9509348
    Abstract: Radio transceiver efficiency is improved by operations involving a calibration mode and an operating mode. The calibration mode includes a first calibration to determine a first optimized tuning control data for a first antenna matching network of a first transmitter when a second transmitter of the portable transceiver system inactive. A second calibration of the first antenna matching network while the second transmitter is active to determine second optimized tuning control data. In operational mode the first optimized tuning control data is used when the second transmitter is not active. The second optimized tuning control data is used when the second transmitter is active.
    Type: Grant
    Filed: May 9, 2016
    Date of Patent: November 29, 2016
    Assignee: Harris Corporation
    Inventors: Melissa S. Daminski, Cory N. Fitzsimmons
  • Patent number: 9419688
    Abstract: Provided is a transmission device including a terminal connected electrically to a terminal of another device, and a transmission unit configured to transmit information through the terminal by performing load modulation according to contact between the terminal and the terminal of the other device.
    Type: Grant
    Filed: August 15, 2011
    Date of Patent: August 16, 2016
    Assignee: Sony Corporation
    Inventor: Takanori Washiro
  • Patent number: 9380540
    Abstract: A method comprising for adjusting a power level in a key fob includes transmitting a first output signal at a first power setting. A feedback signal is received via a feedback mechanism that indicates a first power level of the first output signal. The first output level is compared to a threshold level. A second output signal at a second power setting greater than the first power setting is transmitted if the first output power level is below the threshold.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: June 28, 2016
    Assignee: FORD GLOBAL TECHNOLOGIES, LLC
    Inventors: Thomas Joseph Hermann, Tye Arthur Winkel, John Locke, Lawrence Banasky, Jr., Mark Wisnewski
  • Patent number: 9294056
    Abstract: A scalable periphery tunable matching power amplifier is presented. Varying power levels can be accommodated by selectively activating or deactivating unit cells of which the scalable periphery tunable matching power amplifier is comprised. Tunable matching allows individual unit cells to see a constant output impedance, reducing need for transforming a low impedance up to a system impedance and attendant power loss. The scalable periphery tunable matching power amplifier can also be tuned for different operating conditions such as different frequencies of operation or different modes.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: March 22, 2016
    Assignee: Peregrine Semiconductor Corporation
    Inventors: Dan William Nobbe, David Halchin, Jeffrey A. Dykstra, Michael P. Gaynor, David Kovac, Kelly Michael Mekechuk, Gary Frederick Kaatz, Chris Olson
  • Patent number: 9258784
    Abstract: A method is provided, comprising transmitting a radio transmission using a radio transmitter circuit connected to a corresponding antenna of a mobile electronic device, detecting a change in transmission conditions, and adjusting the power radiated by said antenna in response to a detected change. A mobile electronic device is provided, comprising a radio transmitter circuit, an antenna connected to said radio transmitter circuit, and a controller adapted for transmitting a radio transmission using said radio transmitter circuit, detecting a change in transmission conditions, and adjusting the power radiated by said antenna in response to a detected change.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: February 9, 2016
    Assignee: Nokia Technologies Oy
    Inventors: Lee Corey Sinton, Neil Briffett
  • Patent number: 9237576
    Abstract: The present invention discloses a power control method and apparatus. The power control method of the present invention includes: when a service runs in a first-standard communication system, determining a transmit power P1 of the first-standard communication system; determining that the transmit power P1 is higher than or equal to a threshold value P2 of power interference of the first-standard communication system to a second-standard communication system; use a power lower than P1 to send data on an interference frequency of the first-standard communication system. According to the power control method in the present invention, a signal transmit power of the interfering frequency of the first-standard communication system can be reduced when it is determined that the first-standard communication system will cause interference to the second-standard communication system, thereby reducing the interference of the first-standard communication system to the second-standard communication system.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: January 12, 2016
    Assignee: Huawei Technologies Co., Ltd
    Inventors: Kai Yang, Xiang Peng, Zhen Li
  • Patent number: 9178734
    Abstract: A communications transmitter includes a combination modulator and a baseband processor configured to generate amplitude, angle, in-phase and quadrature signals. The combination modulator is configured to modulate in the quadrature domain or the polar domain, depending on an output power level of the transmitter and/or the type of modulation scheme being used. When configured to modulate in the quadrature domain, the baseband processor is configured to generate time-varying in-phase and quadrature modulating signals and time-invariant amplitude and angle signals for the combination modulator. When configured to modulate in the polar domain, the baseband processor is configured to generate time-varying amplitude and angle modulating signals and time-invariant in-phase and quadrature signals for the combination modulator. In another embodiment of the invention, the communications transmitter is configurable to operate in three different operational modes: linear, envelope tracking and switch modes.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: November 3, 2015
    Inventor: Earl W. McCune, Jr.
  • Patent number: 9178728
    Abstract: A transmitter may include a first path configured to receive a signal, to attenuate the low frequency components of the signal, and to output the low frequency component attenuated signal. The transmitter may further include a second path configured to receive the signal, to amplify the signal, and to output the amplified signal. The transmitter may also include a node coupled to the first path and the second path and configured such that the low frequency component attenuated signal and the amplified signal combine at the node.
    Type: Grant
    Filed: July 12, 2013
    Date of Patent: November 3, 2015
    Assignee: FUJITSU LIMITED
    Inventor: Samir Parikh
  • Patent number: 9166527
    Abstract: A Power amplifier circuit comprising an input, an output comprising: means for sensing the input voltage; and a set of n cascode circuits, each comprising a first transistor having a gate, a source and a drain terminal and further comprising a second transistor having gate, source and drain terminal; the source and gate of the first transistor of said cascode circuits being respectively connected to a first reference voltage and to receive the input signal, the drain of said first transistor being connected to the source of said second transistor, the drain of which being coupled to said output. By activating or deactivating one or more of the n cascode circuits, the total size of the amplification components can be adapted to the value of the output power to generate.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: October 20, 2015
    Assignee: ST-ERICSSON SA
    Inventor: Vincent Knopik
  • Patent number: 9136809
    Abstract: An RF power amplifier operates over the range of supply voltages provided by a DC/DC converter whether the range of voltages is intentional or unintentional. A system for digitally adjusting the bias levels relative to the supply voltage includes at least one RF power amplifier stage, a digital control block, and a bias circuit. The RF power amplifier stage has at least one RF input signal, at least one RF output signal, and at least one bias input that controls its bias conditions. The RF Power Amplifier Stage includes one or more active gain elements used to amplify the RF input signals. The RF power amplifier operates in a number of bias states controlled by the digital control block. The digital control block uses information related to the supply voltage and may use other information stored in memory to select the desired bias.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: September 15, 2015
    Assignee: QUALCOMM INCORPORATED
    Inventors: Robert J. McMorrow, Susanne A. Paul, Aria Eshraghi, Marius Goldenberg
  • Patent number: 9112548
    Abstract: A method to optimize the power assignment of user streams transmitted from base stations in coordinated base station transmission systems. In the method of the invention said CBST systems employ block diagonalization techniques and are deployed in MIMO-OFDM scenarios, and it further comprises using a new waterfilling technique which provides a performance very close to the theoretical ideal but with a reduced computational complexity.
    Type: Grant
    Filed: July 6, 2012
    Date of Patent: August 18, 2015
    Assignee: Telefonica, S.A.
    Inventors: Ana Garcia Armada, Ma Luz Pablo Gonzalez, Matilde Sanchez Fernandez, Roberto Corvaja, Ignacio Berberana Fernandez Murias
  • Patent number: 9100921
    Abstract: Embodiments include methods and apparatus for performing transmit power control. A gain application element receives a sequence of digital input samples and a digital gain signal, and combines the digital gain signal with the digital input samples to generate a sequence of gain-compensated digital samples. A power amplifier receives and amplifies an analog version of the gain-compensated digital samples in order to generate an antenna output signal. A feedback path generates an analog feedback signal from the antenna output signal, produces a sequence of digital feedback samples from the analog feedback signal, and generates difference values based on the digital feedback samples. When a specified type of constant modulus symbol is represented in the antenna output symbol, the feedback path accumulates the difference values into an accumulated error value, and produces the digital gain signal from the accumulated error value.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: August 4, 2015
    Assignee: Apple Inc.
    Inventors: Bing Xu, Mahibur Rahman, Chunmig Zhao
  • Patent number: 9084117
    Abstract: In a cellular communication network, a method of dynamic mobility management in which a base station employing cell-breathing or other similar energy-efficiency mechanism notifies User Equipments (UEs) in its cell, either via broadcasting or with direct over-the-air signaling, that such a mechanism is utilized within the cell. The base station may also notify neighbor base stations of its use of cell-breathing. The neighbor base stations disseminate this information to UEs within their own cells, and consider this information when deciding whether to hand over a UE to a base station that is capable of performing cell-breathing. The base station may also inform UEs in the cell and/or neighbor base stations when it is preparing to reduce transmission power. UEs store information regarding which base stations use cell-breathing, and consider this information when performing cell reselections.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: July 14, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Konstantinos Dimou
  • Patent number: 9072057
    Abstract: Provided are a method and an apparatus for transmitting a signal suitable for an indoor environment. The method for transmitting a signal according to an exemplary embodiment of the present invention includes: preprocessing a signal using a signal power to sidelobe power ratio (SSR) parameter defining a signal to sidelobe ratio to minimize an inter-symbol interference and prevent performance deterioration due to reduction in signal strength; and transmitting the preprocessed signal to a receiving apparatus through a predetermined channel.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: June 30, 2015
    Assignee: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY
    Inventors: Chung Yong Lee, Mi Sun Yoon
  • Patent number: 9054065
    Abstract: This disclosure relates to bipolar transistors, such as heterojunction bipolar transistors, having at least one grading in the collector. One aspect of this disclosure is a bipolar transistor that includes a collector having a high doping concentration at a junction with the base and at least one grading in which doping concentration increases away from the base. In some embodiments, the high doping concentration can be at least about 3×1016 cm?3. According to certain embodiments, the collector includes two gradings. Such bipolar transistors can be implemented, for example, in power amplifiers.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: June 9, 2015
    Assignee: Skyworks Solutions, Inc.
    Inventor: Peter J. Zampardi, Jr.
  • Patent number: 9042820
    Abstract: An optical receiver circuit is disclosed in which a number of electrical signals are processed to extract data encoded therein. The electrical signals may be compared during the process to selectively remove one or more waveforms from one or more corresponding electrical signals. Various data signals, each including one or more waveforms, may then be processed to extract the encoded data. The optical receiver circuit reduces, or eliminates, electrical offsets which may be present in one or more of the electrical signals to reduce corresponding errors in the encoded data signals.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: May 26, 2015
    Assignee: Infinera Corporation
    Inventors: Huan-Shang Tsai, Jeffrey T. Rahn
  • Patent number: 9042848
    Abstract: A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (RF) transmitter module. The method includes deriving a mapping function between an instantaneous envelope of a waveform signal to be amplified by the power amplifier module and the power amplifier module supply voltage to achieve a constant power amplifier module gain based on a gain compression factor, setting an envelope tracking path of the transmitter module into an envelope tracking mode in which mapping between the instantaneous envelope of the waveform signal and the power amplifier module supply voltage is performed using the derived mapping function, applying a training signal comprising an envelope that varies with time to the RF transmitter module, measuring a battery current, modifying the gain compression factor based on the measured battery current, and re-deriving the mapping function based on the modified gain compression factor.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: May 26, 2015
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Manel Collados Asensio, Hsin-Hung Chen, Jonathan Richard Strange
  • Patent number: 9042936
    Abstract: A communication device and a power control method thereof are provided. The power control method, performed by a communication device, includes: determining a power range of a transmit power of an uplink signal; determining a gain switch range based on the power range; when the transmit power of the uplink signal is within the gain switch range, determining a first gain mode for amplifying the uplink signal; and when the transmit power of the uplink signal is out of the gain switch range, determining a second gain mode for amplifying the uplink signal.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: May 26, 2015
    Assignee: Wistron Corp.
    Inventors: Sheng-Lun Chiou, Wen-Chieh Wu
  • Publication number: 20150126142
    Abstract: Compression of an input signal prior to high power radio frequency (RF) amplification and transmission is disclosed. A compression device can receive an input signal and generate a compressed signal that can be passed to an amplification stage to reduce intermodulation effects. The compression device can further generate compression information that can be transmitted to enable a mobile device receiving an amplified version of the compressed signal and the compression information to decompress the amplified version of the compressed signal. Further, a mobile device that can receive an amplified compressed signal and compression information, such that the mobile device can decompress the amplified compressed signal, is also disclosed. The disclosed subject matter can enable use of lower cost, smaller, and less complex RF amplifiers within a wireless network environment.
    Type: Application
    Filed: November 5, 2013
    Publication date: May 7, 2015
    Applicant: AT&T Mobility II LLC
    Inventor: Sheldon Kent Meredith
  • Patent number: 9025793
    Abstract: A selector selects an analog audio signal input to one input port from among analog audio signals input to multiple input ports according to an instruction from the user. An analog gain control circuit amplifies the analog audio signal received from the selector, with a corresponding one of the gains set for the respective input ports. An analog gain control circuit is configured to gradually change its gain when the gain is switched. An A/D converter converts an output signal of the analog gain control circuit into a digital audio signal. A first audio signal processing circuit is monolithically integrated on a signal semiconductor substrate.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: May 5, 2015
    Assignee: Rohm Co., Ltd.
    Inventor: Mitsuteru Sakai
  • Publication number: 20150119115
    Abstract: A device or system for transmission and reception for voice or data communication applications. The device or system is capable of duplex operation and adapted to operate in an environment using a plurality of frequency bands. The present disclosure also relates to a communication means including a transmitter and receiver arrangement and to antennas.
    Type: Application
    Filed: October 29, 2014
    Publication date: April 30, 2015
    Inventors: Oluf Bagger, Bernd Adler, Mikael Bergholz Knudsen, Michael Wilhelm
  • Patent number: 9020455
    Abstract: A transceiver may include an antenna tuning control system operably associated with an antenna tuner to control the current power levels of the transmission signal and the receive signal. The antenna tuner control system may receive transmit power control (TPC) information, which was transmitted to the transceiver from a base station on the receive signal. The TPC information may be utilized to change the current power level of the transmission signal to a desired transmission power level. In addition, the antenna tuner control system may generate receive power control (RPC) information. The RPC information may be utilized to change the current power level of the receive signal to a desired receive power level. The antenna tuner control system is operable to adjust the pass band in accordance with the TPC information and the RPC information.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: April 28, 2015
    Assignee: RF Micro Devices, Inc.
    Inventor: Nadim Khlat
  • Publication number: 20150111512
    Abstract: In a wireless communication device, baseband variable gain amplifiers amplify a baseband signal. Mixers convert the amplified baseband signal into a high-frequency transmission signal. Hybrid variable gain amplifiers amplify an in-phase local signal and an orthogonal local signal which are input to the mixers. The level detection controller changes respective gains of the baseband variable gain amplifiers and the hybrid variable gain amplifiers (505a, 505b), in response to power of the high-frequency.
    Type: Application
    Filed: March 3, 2014
    Publication date: April 23, 2015
    Inventor: Takayuki Tsukizawa
  • Publication number: 20150111511
    Abstract: A transmission apparatus of the present invention includes polar modulator (601) that generates a power supply modulation signal and RF signals of a plurality of carrier frequency bands to be transmitted, power amplifier (603) that amplifies the RF signals from polar modulator (601), and power supply modulator (602) that modulates the power supply terminal of power amplifier (603) by a signal obtained by amplifying the power supply modulation signal from polar modulator (601). The power supply modulation signal is set based on a function using, as an argument, the power of the RF signal of each carrier frequency band output from power amplifier (603).
    Type: Application
    Filed: January 28, 2013
    Publication date: April 23, 2015
    Applicant: NEC CORPORATION
    Inventor: Shingo Yamanouchi