With Specific Filter Structure Patents (Class 455/307)
  • Patent number: 10305524
    Abstract: Embodiments of the present invention provide a method and a device for reducing intermodulation interference. The method includes: performing real-time estimation according to time domain information of M downlink transmit signals, to obtain a first intermodulation interference signal; and cancelling, according to the first intermodulation interference signal, intermodulation interference generated by the M downlink transmit signals in an uplink receive signal, where M is an integer greater than or equal to 2, and the M downlink transmit signals are baseband signals that are transmitted on M carriers and that are not combined. Based on the foregoing solutions, the actually generated intermodulation interference can be effectively cancelled, thereby reducing intermodulation interference and improving system performance.
    Type: Grant
    Filed: June 16, 2016
    Date of Patent: May 28, 2019
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Zhiqiang Zou, Hui Qiao, Honglin Chai
  • Patent number: 10237004
    Abstract: A device includes circuitry configured to determine characteristics of jammer signals associated with a first wireless protocol of another device. An amount of interference between the jammer signals and a first received signal at the device associated with a second wireless protocol is determined, and the jammer signals are filtered from the second received signal when the amount of interference between the jammer signals and the first received signal is greater than a first predetermined threshold.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: March 19, 2019
    Assignee: AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE. LIMITED
    Inventors: Vijay Sundararajan, Sriram Sundararajan, Payam Rabiei, Hrishikesh Atre, Yury Gonikberg, Neeraj Poojary, Suryakant Maharana, Avinash Renuka, Mohammad Karim, Jihui Chen
  • Patent number: 10128878
    Abstract: A system and method for receiving a signal, comprising an input adapted to receive a radio frequency signal having a strong interferer; a signal generator, adapted to produce a representation of the interferer as an analog signal generated based on an oversampled digital representation thereof; and a component adapted to cancel the strong interferer from radio frequency signal based on the generated analog signal to produce a modified radio frequency signal substantially absent the interferer. The system typically has a nonlinear component that either saturates or produces distortion from the strong interferer, which is thereby reduced. The system preferably employs high speed circuits which digitize and process radio frequency signals without analog mixers.
    Type: Grant
    Filed: October 5, 2017
    Date of Patent: November 13, 2018
    Assignee: Hypres, Inc.
    Inventors: Deepnarayan Gupta, Amol Inamdar
  • Patent number: 10090096
    Abstract: A common mode choke coil includes a laminated-type coil that has high breakdown voltage reliability. Coil conductors and a coil conductor for a secondary coil are laminated so as to be respectively interposed between, coil conductors for a primary coil, two coil conductors connected to each other by an inner circumferential side via hole conductor and two coil conductors connected by an inner circumferential side via hole conductor. Meanwhile, in the primary coil, an outer circumferential side via hole conductor is provided so as to pass through only one insulation layer, and accordingly, a length of the outer circumferential side via hole conductor in an axis line direction thereof is reduced. As a result, an amount of conductive material used for the outer circumferential side via hole conductor that diffuses during firing can be reduced, and a drop in a thickness of the insulation layers can be suppressed.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: October 2, 2018
    Assignee: Murata Manufacturing Co., Ltd
    Inventor: Masaki Inui
  • Patent number: 10027358
    Abstract: A receiver includes circuitry configured to determine one or more first local oscillator (LO) harmonics that correspond to one or more first spectrum segments of a down-converted received signal based on characteristics of the received signal. The one or more first LO harmonics of the received signal are amplified by applying one or more first transconductance coefficients to one or more first harmonic selective transinductance amplifiers (TIAs) corresponding to the one or more first spectrum segments. Digitized outputs of the plurality of harmonic selective TIAs are calibrated based on an amount of signal leakage between the plurality of spectrum segments of the down-converted received signal.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: July 17, 2018
    Assignee: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.
    Inventors: Hao Wu, David Patrick Murphy, Hooman Darabi
  • Patent number: 9964972
    Abstract: A mixed mode compensation circuit for a power converter generate a digital signal according to a reference signal and a feedback signal which is related to the output voltage of the power converter, convert the digital signal into a first analog signal, offset the first analog signal with a variable offset value to generate a second analog signal, and filter out high-frequency components of the second analog signal to generate a third analog signal for stable output voltage of the power converter. The mixed mode compensation does not require large capacitors, and thus the circuit can be integrated into an integrated circuit.
    Type: Grant
    Filed: July 3, 2016
    Date of Patent: May 8, 2018
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Chien-Fu Tang, Jiun-Hung Pan, Isaac Y. Chen
  • Patent number: 9948363
    Abstract: A wireless communication system and method that includes configurable Carrier Aggregation (CA) and/or Multiple-input Multiple-output (MIMO) operational modes. In CA, multiple carriers (i.e., channel bundling) are aggregated and jointly used for transmission to/from a single terminal. Downlink inter-band carrier aggregation increases the downlink data rates by routing two signals, received in different frequency bands, simultaneously to two active receivers in the RF transceiver. MIMO utilizes two additional receivers as diversity paths and the frequency generation can be shared between main and diversity path for each carriers.
    Type: Grant
    Filed: January 13, 2016
    Date of Patent: April 17, 2018
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Masoud Kahrizi, Alireza Tarighat Mehrabani
  • Patent number: 9923272
    Abstract: An electronic device may include an adjustable power supply, at least one antenna, and associated antenna tuning circuitry. The antenna tuning circuitry may be an integral part of the antenna and may include a control circuit and at least one tunable element. The tunable element may include radio-frequency switches, continuously/semi-continuously adjustable components such as tunable resistors, inductors, and capacitors, and other load circuits that provide desired impedance characteristics. The power supply may provide power supply voltage signals to the antenna tuning circuitry via inductive coupling. The power supply voltage signals may be modulated according to a predetermined lookup table during device startup so that the control circuit is configured to generate desired control signals. These control signals adjust the tunable element so that the antenna can support wireless operation in desired frequency bands.
    Type: Grant
    Filed: May 21, 2015
    Date of Patent: March 20, 2018
    Assignee: Apple Inc.
    Inventors: Robert S. Sorensen, Qingxiang Li, Matthew A. Mow, Jinku Kim
  • Patent number: 9881165
    Abstract: Security system for protecting a vehicle electronic system by selectively intervening in the communications path in order to prevent the arrival of malicious messages at ECUs, in particular at the safety critical ECUs. The security system includes a filter which prevents illegal messages sent by any system or device communicating over a vehicle communications bus from reaching their destination. The filter may, at its discretion according to preconfigured rules, send messages as is, block messages, change the content of the messages, request authentication or limit the rate such messages can be delivered, by buffering the messages and sending them only in preconfigured intervals.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: January 30, 2018
    Assignee: ARILOU INFORMATION SECURITY TECHNOLOGIES LTD.
    Inventors: Gil Litichever, Ziv Levi
  • Patent number: 9859863
    Abstract: Radio frequency (RF) front-end circuitry that includes control circuitry and an RF filter structure that includes a plurality of resonators are disclosed. In one embodiment, a first tunable RF filter path is defined by a first set of the plurality of resonators such that the first tunable RF filter path has a first amplitude and a first phase. A second tunable RF filter path is defined by a second set of the plurality of resonators such that the second tunable RF filter path has a second amplitude and a second phase. To provide antenna diversity and/or beam forming/beam steering, the control circuitry is configured to set a first amplitude difference between the first amplitude and the second amplitude to approximately a first target amplitude difference and set a first phase difference between the first phase and the second phase to approximately a first target phase difference.
    Type: Grant
    Filed: November 26, 2014
    Date of Patent: January 2, 2018
    Assignee: Qorvo US, Inc.
    Inventors: George Maxim, Dirk Robert Walter Leipold, Baker Scott
  • Patent number: 9800945
    Abstract: Switched digital television programming for video-on-demand and other interactive television services are combined utilizing class-based, multi-dimensional decision logic to simultaneously optimize video quality and audio uniformity while minimizing latency during user interactions with the system over an unmanaged network. For example, a method of adapting content-stream bandwidth includes generating a content stream for transmission over an unmanaged network with varying capacity; sending the content stream, via the unmanaged network, toward a client device; monitoring the capacity of the unmanaged network; determining whether an aggregate bandwidth of an upcoming portion of the content stream fits the capacity, wherein the upcoming portion of the content stream corresponds to a respective frame time and includes video content and user-interface data; and, in response to a determination that the aggregate bandwidth does not fit the capacity, reducing a size of the upcoming portion of the content stream.
    Type: Grant
    Filed: April 26, 2015
    Date of Patent: October 24, 2017
    Assignee: ACTIVEVIDEO NETWORKS, INC.
    Inventors: Ronald A. Brockmann, Maarten Hoeben
  • Patent number: 9793933
    Abstract: A system and method for receiving a signal, comprising an input adapted to receive a radio frequency signal having a strong interferer; a signal generator, adapted to produce a representation of the interferer as an analog signal generated based on an oversampled digital representation thereof; and a component adapted to cancel the strong interferer from radio frequency signal based on the generated analog signal to produce a modified radio frequency signal substantially absent the interferer. The system typically has a nonlinear component that either saturates or produces distortion from the strong interferer, which is thereby reduced. The system preferably employs high speed circuits which digitize and process radio frequency signals without analog mixers.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: October 17, 2017
    Assignee: Hypres, Inc.
    Inventors: Deepnarayan Gupta, Amol Inamdar
  • Patent number: 9787277
    Abstract: A variable filter circuit includes a serial arm connected between ports (P1-P2), a parallel arm having a resonator connected in series between ports (P1-P3), and another parallel arm having another resonator connected in series between ports (P2-P3). The serial arm includes a capacitor connected between the ports (P1-P2), and the parallel arms include variable capacitances connected in series to the resonators.
    Type: Grant
    Filed: August 8, 2016
    Date of Patent: October 10, 2017
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Takashi Ogami, Hitoshi Tada, Masakazu Tani, Shouzo Sugiyama
  • Patent number: 9780760
    Abstract: A variable filter circuit includes a serial arm connected between ports (P1-P2), a parallel arm having a resonator connected in series between ports (P1-P3), and another parallel arm having another resonator connected in series between ports (P2-P3). The serial arm includes an inductor connected between the ports (P1-P2), and the parallel arms include variable capacitances connected in series to the resonators.
    Type: Grant
    Filed: August 8, 2016
    Date of Patent: October 3, 2017
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Masakazu Tani, Shouzo Sugiyama
  • Patent number: 9735758
    Abstract: Analog interference filter devices and methods for isolation of desirable portions of a radio frequency signal. Signal compensation is used to provide desirable center frequency, passband width, ripple, rolloff, stopband and distortion performance. The filter is implemented with passive and/or active components.
    Type: Grant
    Filed: May 6, 2016
    Date of Patent: August 15, 2017
    Assignee: PHYSICAL DEVICES, LLC
    Inventor: Jonathan Ryan Wilkerson
  • Patent number: 9722746
    Abstract: Methods and apparatus for providing bandpass analog to digital conversion (ADC) in RF receiver circuitry of a wireless-communication device. The bandpass ADC includes first noise-shaping successive approximation register (NS-SAR) circuitry arranged in a first path and second NS-SAR circuitry arranged in a second path parallel to the first path, wherein the first and second NS-SAR circuitries are configured to alternately sample an analog input voltage at a particular sampling rate and to output a digital voltage at the particular sampling rate.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: August 1, 2017
    Assignee: MediaTek Inc.
    Inventors: Stacy Ho, Wei-Hsin Tseng
  • Patent number: 9666356
    Abstract: In a common-mode choke coil, first annular conductors are helically defined from the lower layer to the upper layer, and first annular conductors are helically defined from the upper layer to the lower layer. Further, second annular conductors are helically defined from the lower layer to the upper layer, and second annular conductors are helically defined from the upper layer to the lower layer. The first annular conductors and the second annular conductors are disposed alternately in a lamination direction. The first annular conductors and the second annular conductors are disposed such that substantial portions of the annular conductors adjacent to each other in the layer direction do not overlap in a planar view. This structure achieves a compact common-mode choke coil with which the loss of normal-mode signals is small, and which is highly capable of removing common-mode noise.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: May 30, 2017
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Noboru Kato, Takashi Noma, Hisashi Akiyama
  • Patent number: 9647720
    Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for selecting a spectral region in a radio frequency spectrum for initiating a communication session having an uplink and a downlink, correlating a signal strength of portions of the spectral region to generate a correlation factor, detecting radio frequency interference in the spectral region according to the correlation factor, and generating tuning coefficient data to substantially suppress the radio frequency interference in the spectral region during the communication session. Other embodiments are disclosed.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: May 9, 2017
    Assignee: ISCO International, LLC
    Inventors: Amr Abdelmonem, Sean S. Cordone
  • Patent number: 9614634
    Abstract: The present invention concerns a method for cancelling a narrow band interference in a single carrier signal. The method comprises the steps executed by a receiver of: receiving the single carrier signal and transforming the single carrier signal into received symbols, transforming the received symbols from the time domain to the frequency domain into received symbols in the frequency domain, determining a signal and thermal noise power estimation based on the received symbol powers in the frequency domain, estimating variances of the narrow hand interference from the signal and thermal noise power estimation and the received symbol powers in the frequency domain, equalizing the received symbols in the frequency domain or symbols derived from the received symbols in the frequency domain taking into account the estimate of the variances of the narrow band interference.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: April 4, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Damien Castelain
  • Patent number: 9479215
    Abstract: A method of processing digital samples of a signal received at a receiver of a wireless communication system includes monitoring channel conditions and generating a channel indicator including at least one channel parameter by performing at least one of: estimating a channel mobility parameter and comparing it with a threshold; estimating a channel parameter of the energy of the channel outside a predefined temporal window, and comparing it with a threshold; estimating a channel temporal duration parameter and establishing if it meets predetermined criteria; estimating a channel-zero location parameter and establishing if it meets predetermined criteria; estimating a received-signal signal-to-disturbance power ratio, and comparing it to a threshold; estimating an estimated-channel-response signal-to-disturbance power ratio; estimating the degree of non-stationarity of the disturbance at the receiver input; and selecting one of a plurality of processing routines for processing the digital samples based on said
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: October 25, 2016
    Assignee: ICERA INC.
    Inventors: Carlo Luschi, Simon Walker, Steve Allpress, Philip Jones
  • Patent number: 9479140
    Abstract: A complex-pole load is configured as a parallel circuit, having 4 transistors arranged in pairs. Each pair of transistors has a transistor gated by a control voltage sources, and connected in parallel with a transistor diode connected for gating by the respective input. The control voltage sources result in the circuit synthesizing a first order complex pole at a positive IF (+IF) or a negative IF (?IF) for channel selection and image rejection, offering image rejection and channel selection concurrently.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: October 25, 2016
    Assignee: UNIVERSITY OF MACAU
    Inventors: Zhicheng Lin, Pui-In Mak, Rui Paulo da Silva Martins
  • Patent number: 9444673
    Abstract: Methods, systems, and apparatuses for down-converting a modulate carrier signal to a demodulated baseband signal by sampling the energy of the carrier signal are described herein. Briefly stated, such methods systems, and apparatuses operate by receiving a modulated carrier signal and using pulses with apertures to control a switch so as to (a) transfer energy from the modulated carrier signal and accumulate the transferred energy in a capacitor when the switch is closed during the apertures of the pulses and (b) discharge some of the previously accumulated energy from the capacitor into load circuitry at least when the switch is open. The demodulated baseband signal is generated from (i) accumulating energy transferred to the capacitor each time the switch is closed during the apertures of the pulses, and (ii) discharging some of the previously accumulated energy into the load circuitry each time the switch is opened.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: September 13, 2016
    Assignee: ParkerVision, Inc.
    Inventors: David F. Sorrells, Michael J. Bultman, Robert W. Cook, Richard C. Looke, Charley D. Moses, Jr.
  • Patent number: 9274200
    Abstract: A frequency detection circuit includes a filter, a power detector and a voltage comparator. The filter receives and filters a converted signal to generate a filtered signal. The power of the filtered signal relates to a frequency of the converted signal. The power detector generates a voltage according to the power of the filtered signal. The voltage comparator compares the voltage with multiple reference voltages to generate multiple comparison results. At least one of the inductance and capacitance of an LC tank in an amplifier is adjusted according to the comparison results.
    Type: Grant
    Filed: September 4, 2013
    Date of Patent: March 1, 2016
    Assignee: Intel Corporation
    Inventors: Hsien-Ku Chen, Bing-Jye Kuo, Fang-Ren Liao, Pei-Wei Chen
  • Patent number: 9252742
    Abstract: A method and an apparatus are provided for setting a cut-off frequency of an analog filter of a reception device for wireless communication. A deviation value is obtained that corresponds to an error between a first gain value based on an ideal transfer function curve and a second gain value based on a measured transfer function curve at an arbitrary frequency of a frequency band in which a constant interval is maintained between a slope of the ideal transfer function curve and a slope of the measured transfer function curve. A cut-off frequency that is used to measure the measured transfer function curve in a real environment, is corrected based on the obtained deviation value.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: February 2, 2016
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Jong-Woo Lee, Si-Bum Jun
  • Patent number: 9184776
    Abstract: In a method and apparatus for operating a super-heterodyne receiver, a tuning circuit has a local oscillator for frequency shifting a desired channel to a selected frequency and a controller for controlling the local oscillator. The controller determines for each of a number of identified channels, whether an image signal is present at frequencies in the spectrum that when tuned to a first selected frequency interfere, and is operable to select a modified selected frequency at which interference between the image signal and the identified channel is reduced.
    Type: Grant
    Filed: January 11, 2011
    Date of Patent: November 10, 2015
    Inventors: John Tryhub, Lance Greggain, Gary Cheng, Stephen Jantzi
  • Patent number: 9129817
    Abstract: Semiconductor packages including magnetic core inductor (MCI) structures for integrated voltage regulators are described. In an example, a semiconductor package includes a package substrate and a semiconductor die coupled to a first surface of the package substrate. The semiconductor die has a first plurality of metal-insulator-metal (MIM) capacitor layers thereon. The semiconductor package also includes a magnetic core inductor (MCI) die coupled to a second surface of the package substrate. The MCI die includes one or more slotted inductors and has a second plurality of MIM capacitor layers thereon.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: September 8, 2015
    Assignee: Intel Corporation
    Inventors: Adel A. Elsherbini, Kevin P. O'Brien, Henning Braunisch, Krishna Bharath
  • Patent number: 9124335
    Abstract: A radio frequency (RF) noise-cancelling receiver includes first transconductance cells configured to produce respective weighted current signals proportional to an input voltage signal. The RF receiver includes frequency conversion cells coupled to the first transconductance cells and configured to mix the weighted current signals with a plurality of non-overlapping local oscillator (LO) signals to produce downconverted current signals. The RF receiver includes transimpedance amplifiers coupled to the frequency conversion cells and configured to produce output voltage signals proportional to the downconverted current signals. The transimpedance amplifiers include second transconductance cells.
    Type: Grant
    Filed: May 1, 2015
    Date of Patent: September 1, 2015
    Assignee: Broadcom Corporation
    Inventors: David Murphy, Hooman Darabi
  • Patent number: 9083299
    Abstract: A filter of an adjustable frequency response comprises a plurality of filters having a plurality of distinct frequency responses, respectively. These filters receive a common input signal and generate a plurality of intermediate signals, respectively. A multiplexing circuit is used to select one of these intermediate signals as a filtered signal. The multiplexing circuit is controlled by a control signal that is related to a state of the filtered signal.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: July 14, 2015
    Assignee: REALTEK SEMICONDUCTOR CORP.
    Inventor: Chia-Liang Lin
  • Patent number: 9059796
    Abstract: A radio frequency (RF) noise-cancelling receiver includes first transconductance cells configured to produce respective weighted current signals proportional to an input voltage signal. The RF receiver includes frequency conversion cells coupled to the first transconductance cells and configured to mix the weighted current signals with a plurality of non-overlapping local oscillator (LO) signals to produce downconverted current signals. The RF receiver includes transimpedance amplifiers coupled to the frequency conversion cells and configured to produce output voltage signals proportional to the downconverted current signals. The transimpedance amplifiers include second transconductance cells.
    Type: Grant
    Filed: January 8, 2013
    Date of Patent: June 16, 2015
    Assignee: Broadcom Corporation
    Inventors: David Murphy, Hooman Darabi
  • Patent number: 9042858
    Abstract: According to one embodiment, a compact low-power receiver comprises first and second analog circuits connected by a digitally controlled interface circuit. The first analog circuit has a first direct-current (DC) offset and a first common mode voltage at an output, and the second analog circuit has a second DC offset and a second common mode voltage at an input. The digitally controlled interface circuit connects the output to the input, and is configured to match the first and second DC offsets and to match the first and second common mode voltages. In one embodiment, the first analog circuit is a variable gain control transimpedance amplifier (TIA) implemented using a current mode buffer, the second analog circuit is a second-order adjustable low-pass filter, whereby a three-pole adjustable low-pass filter in the compact low-power receiver is effectively produced.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: May 26, 2015
    Assignee: BROADCOM CORPORATION
    Inventors: Mohyee Mikhemar, Amir Hadji-Abdolhamid, Hooman Darabi
  • Patent number: 9042857
    Abstract: Methods, systems, and computer readable media for wideband frequency and bandwidth tunable filtering are disclosed. According to one aspect, the subject matter described herein includes a wideband frequency and bandwidth tunable filter that splits a filter input signal into first and second input signals, modifies the first input signal to produce a first output signal, modifies the second input signal to produce a second output signal having an intermediate frequency response, and combines the first and second output signals while adjusting their relative phases and/or amplitudes to produce a filter output signal with the target frequency response. Adjustment includes splitting the second input signal into third and fourth input signals, which are modified and then combined to produce the second output signal having the intermediate frequency response.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: May 26, 2015
    Assignee: PHYSICAL DEVICES, LLC
    Inventors: Frederick Vosburgh, Charley Theodore Wilson, III, Jonathan Ryan Wilkerson
  • Patent number: 9036752
    Abstract: A method of frequency-domain filtering is provided that includes a plurality of filters, the plurality of filters including at least one constrained filter(s) W=I, I and at least one unconstrained filter(s) W=1,K? The method includes cascading the W k=i,K unconstrained filter(s). A single constraint window C is applied to the cascaded W=i,K unconstrained filter(s). The W=1,I constrained filter(s) are cascaded with the constrained cascaded Wk=1,K unconstrained filter(s) to form a resulting filter Wll=C(W 1{circle around (x)} . . . {circle around (x)} W){circle around (x)} W . . . W. The frequency domain representation of the single constraint window C may be based, at least in part, on a time domain representation of a single constraint window C that has been circularly shifted such that the frequency domain representation of the constraint window matches a property of the frequency domain representation of the cascaded W=1,K unconstrained filters.
    Type: Grant
    Filed: May 5, 2011
    Date of Patent: May 19, 2015
    Assignee: NUANCE COMMUNICATIONS, INC.
    Inventors: Markus Buck, Tobias Wolff
  • Publication number: 20150133069
    Abstract: Methods, systems, and devices are described for wireless communications in a frequency modulation (FM) receiver with a frequency deviation-dependent adaptive channel filter. A maximum frequency deviation of an FM broadcast signal may be estimated. One or more coefficients of a channel filter may be adapted based at least in part on the maximum frequency deviation. The coefficient adaptation may include identifying a set of coefficients corresponding to the maximum frequency deviation and applying the set of coefficients to the channel filter. The set of coefficients may be identified by selecting one of multiple sets of coefficients stored in memory. In some instances, a signal quality metric (e.g., signal-to-noise ratio (SNR)) may be identified and may be used to modify a value of one or more of the set of coefficients applied to the channel filter.
    Type: Application
    Filed: November 14, 2013
    Publication date: May 14, 2015
    Applicant: QUALCOMM Incorporated
    Inventors: Eunmo Kang, Yossef Tsfaty, Le Nguyen Luong
  • Patent number: 9032449
    Abstract: The present invention concerns a method and associated apparatus for reducing the time required to scan an incoming satellite transmission power spectrum for available signals and to determine the characteristics of those signals. The frequency range of interest is scanned in narrow slices to determine approximate input power within each slice. Center frequencies and symbol rates of individual transponders are then estimated based upon these input power approximations.
    Type: Grant
    Filed: November 13, 2009
    Date of Patent: May 12, 2015
    Assignee: Thomson Licensing
    Inventor: Brian David Bajgrowicz
  • Patent number: 9031527
    Abstract: Apparatus, systems, and methods implementing techniques for calibrating a filter circuit. A comparator generates an output based on a filter output amplitude signal and a reference amplitude signal. A calibration logic unit receives the comparator output and produces a component code that is used by the filter circuit to adjust one or more component values.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: May 12, 2015
    Assignee: Marvell International Ltd.
    Inventors: King Chun Tsai, Sang Wong Son, Wayne A. Loeb
  • Patent number: 9020023
    Abstract: The present technique relates to a reception device and a reception method which can improve equalization performance. An equalization processing unit has a time domain equalization unit which equalizes a received signal in a time domain and a frequency domain equalization unit which is provided in parallel to the time domain equalization unit and which equalizes the received signal in a frequency domain, and performs control of switching between the time domain equalization unit and the frequency domain equalization unit. The present technique can be applied to, for example, equalize a signal of data transmitted by way of single carrier transmission or data transmitted by way of multicarrier transmission.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: April 28, 2015
    Assignee: Sony Corporation
    Inventors: Katsumi Takaoka, Naoki Yoshimochi, Hidetoshi Kawauchi, Ryo Hasegawa, Hirofumi Maruyama
  • Patent number: 9014652
    Abstract: Embodiments provide a mobile communication device comprising an adaptive filter for filtering a RF signal and a controller. The adaptive filter comprises a first terminal, a second terminal, a reference terminal for providing a reference potential, a first filter structure connected in series between the first terminal and the second terminal, a second filter structure connected in series between the first terminal and the reference terminal, and a third filter structure connected in series between the second terminal and the reference terminal, wherein at least one filter structure of the first, second and third filter structures comprises at least one switchable filter element. The controller is configured to selectively activate or deactivate the at least one switchable filter element based on the RF signal or a baseband version thereof.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: April 21, 2015
    Assignee: Infineon Technologies AG
    Inventor: Winfried Bakalski
  • Patent number: 9014124
    Abstract: A wireless transmit/receive unit (WTRU) is described. The WTRU includes a front-end unit (FEU), a signal processing unit (SPU), and a resource management unit (RMU). The FEU receives a radio frequency (RF) signal, generates time-interleaved samples, an includes: a first array of first time-interleaved samplers, a second array of second time-interleaved samplers, and a third array of third time-interleaved samplers. The SPU receives and combines the plurality of time-interleaved samples and generates a signal quality measurement and in-phase and quadrature-phase (IQ) complex samples. The RMU receives the signal quality measurement and allocates FEU resources in conjunction with a front-end unit controller (FEUC) based on the signal quality measurement. The FEUC generates control signals based on the received signal quality measurement from the RMU.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: April 21, 2015
    Assignee: InterDigital Patent Holdings, Inc.
    Inventors: Tanbir Haque, Leonid Kazakevich, Scott M. Newton
  • Patent number: 9014653
    Abstract: A novel and useful reconfigurable superheterodyne receiver that employs a 3rd order complex IQ charge-sharing band-pass filter (BPF) for image rejection and 1st order feedback based RF BPF for channel selection filtering. The operating RF input frequency of the receiver is 500 MHz to 1.2 GHz with a varying high IF range of 33 to 80 MHz. The gain stages are inverter based gm stages and the total gain of the receiver is 35 dB and in-band IIP3 at mid gain is +10 dBm. The NF of the receiver is 6.7 dB which is acceptable for the receiver without an LNA. The architecture is highly reconfigurable and follows the technology scaling.
    Type: Grant
    Filed: September 16, 2013
    Date of Patent: April 21, 2015
    Assignee: Technische Universiteit Delft
    Inventors: Iman Madadi, Massoud Tohidian, Robert Bogdan Staszewski
  • Patent number: 9008249
    Abstract: Techniques are provided which may be implemented using various methods and/or apparatuses in a device comprising a receiver to scan a spectral band of a received signal comprising a desired signal contribution to determine whether signal data associated with at least a sub-band of the spectral band further comprises at least one undesired signal contribution. In response to determining that the signal data comprises at least one undesired signal contribution, the mobile station may initiate at least one notch filter to affect the undesired signal contribution in subsequent signal data associated with the received signal.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: April 14, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Jie Wu, Emilija M. Simic, Timothy Paul Pals, Duong A. Hoang
  • Publication number: 20150099471
    Abstract: A receiver and a transmitter that copes with interference in a super-regenerative communication system, and a method of using the receiver and the transmitter, are provided. A super-regenerative receiver includes a resonance frequency adjusting unit configured to adjust a resonance frequency associated with a filtering band of a transmission signal that is received from a transmitter. The super-regenerative receiver further includes an oscillation signal generating unit configured to generate an oscillation signal, using a positive feedback amplification, based on the resonance frequency and the transmission signal. The super-regenerative receiver further includes an oscillation characteristic detecting unit configured to detect a characteristic of the oscillation signal. The super-regenerative receiver further includes a determining unit configured to determine whether interference is included in the transmission signal based on the characteristic of the oscillation signal and the resonance frequency.
    Type: Application
    Filed: November 13, 2014
    Publication date: April 9, 2015
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Joon Seong KANG, Jae Sup LEE, Hyo Sun HWANG
  • Patent number: 9000969
    Abstract: A received plurality of signals may be filtered to select an in-band signal and/or an out-of-band. A signal strength of the selected signal(s) may be measured. A resolution of an analog-to-digital converter may be controlled based on the measured signal strength(s). The selected in-band signal may be converted to a digital representation via the analog-to-digital converter. The resolution may be decreased when the strength of the in-band signal is higher, and increased when the strength of the in-band signal is lower. The resolution may be increased when the strength of the out-of-band signal is higher, and decreased when the strength of the out-of-band signal is lower. A signal-to-noise ratio and/or dynamic range of the selected signal(s) may be determined based on the measured signal strength(s), and may be utilized to adjust the resolution of the analog-to-digital converter.
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: April 7, 2015
    Assignee: Broadcom Corporation
    Inventor: Ahmadreza Rofougaran
  • Patent number: 9002309
    Abstract: A tunable multi-band receiver supporting operation on a plurality of frequency bands is disclosed. In an exemplary design, the tunable multi-band receiver includes an antenna tuning network, a tunable notch filter, and at least one low noise amplifier (LNA). The antenna tuning network tunes an antenna (e.g., a diversity antenna) to a receive band in a plurality of receive bands. The tunable notch filter is tunable to a transmit band in a plurality of transmit bands and attenuates signal components in the transmit band. One LNA among the at least one LNA amplifies an output signal from the tunable notch filter. The tunable multi-band receiver may further include one or more additional tunable notch filters to further attenuate the signal components in the transmit band.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: April 7, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Gurkanwal Singh Sahota, Steven C. Ciccarelli, Sang-June Park, Charles J. Persico
  • Publication number: 20150094009
    Abstract: A branch circuit includes a common antenna port and separates a first communication signal including a signal in a low band and a signal in a high band and a second communication signal that is a signal in a frequency band between the low band and the high band. The branch circuit includes a first-communication-signal-line-side band elimination filter and a second-communication-signal-line-side band elimination filter and SAW filter.
    Type: Application
    Filed: December 10, 2014
    Publication date: April 2, 2015
    Inventors: Kuniaki YOSUI, Noboru KATO
  • Publication number: 20150072635
    Abstract: A circuit and method for filtering adjacent channel interferers. One embodiment of an adjacent channel filtering circuit for reducing adjacent channel interference with an in-band signal, includes: (1) a radio frequency (RF) circuit configured to receive and down-convert an RF signal to a baseband signal containing an in-band signal and adjacent channel components, (2) a controlled single pole filter electrically coupled to the RF circuit and configured to reject the adjacent channel components and cause a predetermined attenuation in the in-band signal, (3) a baseband circuit coupled to the controlled single pole filter and configured to condition the baseband signal for conversion to a digital signal, and (4) a digital circuit coupled to the baseband circuit and configured to receive the digital signal and compensate for the predetermined attenuation.
    Type: Application
    Filed: September 11, 2013
    Publication date: March 12, 2015
    Applicant: Nvidia Corporation
    Inventors: Essam Atalla, Abdellatif Bellaouar
  • Patent number: 8971835
    Abstract: Some embodiments of the invention relate a circuit having a first and a second electrically connected voltage domains, respectively biased at different supply voltages (e.g., the first voltage domain biased at a low bias voltage and the second voltage domain biased at a second, different supply voltage). The apparatus further comprises a first DC current source coupled to one of the voltage domains (e.g., the first voltage domain having a low DC voltage potential) and a second DC current source coupled to the other voltage domain (e.g., the second voltage domain having a high DC voltage potential). The first and second DC current sources are configured to provide a DC cancellation current having a value that cancels a DC current generated by the potential difference between the first and second voltage domains.
    Type: Grant
    Filed: January 5, 2011
    Date of Patent: March 3, 2015
    Assignee: Intel Mobile Communications GmbH
    Inventors: Krzysztog Dufrene, Elmar Wagner
  • Patent number: 8971834
    Abstract: Third-order intermodulation products (IM3) are attenuated in RF receivers by providing a typical main signal path and a parallel auxiliary signal path in which the IM3 products are accentuated, and the output from the main signal path is adaptively filtered to attenuate the IM3 products. In one embodiment, a multirate filter bank (MRFB) with asymmetric analysis and synthesis sections is used to detect and isolate the IM3 products. In another embodiment an analog nonlinear term generator is placed at the front of the auxiliary signal path. The analog nonlinear term generator takes advantage of the nonlinearities of a differential MOSFET circuit and a multiplier to extract the IM3 products in the RF input signal. The outputs of the main signal path and the auxiliary signal path are inputs to a complex least mean squares filter to attenuate the IM3 products in the resulting signal.
    Type: Grant
    Filed: November 23, 2010
    Date of Patent: March 3, 2015
    Assignee: California Institute of Technology
    Inventors: Edward Keehr, Seyed Ali Hajimiri
  • Patent number: 8965321
    Abstract: A stage is provided for a receiver of a wireless device. The stage comprises a matching network that separates amplified signals of interest received from an amplifier from amplified unwanted signals received from the amplifier in conjunction with additional downstream filters. The stage also comprises a signal path that comprises components for receiving and processing the amplified signals of interest, and a shunt path that comprises components for adjusting reflected energy sent back to the amplifier for limiting the output swing of the amplifier in a frequency band corresponding to the amplified unwanted signals.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: February 24, 2015
    Assignee: BlackBerry Limited
    Inventors: Wen-Yen Chan, Nasserullah Khan
  • Publication number: 20150044981
    Abstract: A system and method for multi-notch filtering for a communication device are provided. The system includes an input node to receive a signal directed to the communication device; a time delay element to delay the signal by a predetermined time delay; a summation element to sum the signal and the time-delayed signal; and a gain element to output the summed signal to the communication device.
    Type: Application
    Filed: August 12, 2013
    Publication date: February 12, 2015
    Inventor: Yao H. Kuo
  • Patent number: 8954025
    Abstract: A communications radio has an IF stage with an associated filter array. The array includes at least one narrowband filter whose passband is less than 3 MHz, at least one wideband filter whose passband is 3 MHz or greater, a first switch with a common pole connected to an input terminal of the array, a second switch with a common pole connected to an output terminal of the array, a third switch whose common pole is operatively connected to the input terminal, and a fourth switch whose common pole is operatively connected to the output terminal. The first and the second switches cooperate to insert a selected filter between the first and second terminals. The third and the fourth switches cooperate to insert the filter array into either a receive signal path when the radio is in a receive mode, or a transmit signal path when in a transmit mode.
    Type: Grant
    Filed: April 18, 2012
    Date of Patent: February 10, 2015
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: Michael S. Vogas