Patents Examined by Shikha Goyal
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Patent number: 8324953Abstract: A system for processing an input signal, the system including: (a) a hardware memory module configured to store a lookup table; and (b) a signal processing module, configured to clip the input signal to provide a second signal that does not exceed a magnitude threshold, wherein the signal processing module is configured to clip the input signal by processing the input signal using at least one filtering parameter that is retrieved from the lookup table using at least one lookup table index which is selected in response to the input signal.Type: GrantFiled: October 21, 2009Date of Patent: December 4, 2012Assignee: Vyycore Ltd.Inventors: Doron Shahar Koren, Sergey Toujikov
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Patent number: 8326245Abstract: A disclosed radio communication apparatus transmits a radio signal to multiple users via multiple transmit antenna groups at appropriate transmit power levels, each of the transmit antenna groups including one or more transmit antennas, the transmit antenna groups having respective transmit power constraints. The apparatus includes a precoding unit configured to perform precoding on signals modulated for individual users and generate transmit weights, an optimum transmit power calculation unit configured to receive the transmit weights from the precoding unit and use components of the transmit weights and respective transmit power limit values for the transmit antenna groups to calculate an initial value for a transmit power optimization problem for calculation of the appropriate transmit power levels for the users, and a transmission unit configured to transmit radio signals at the calculated transmit power levels.Type: GrantFiled: April 29, 2009Date of Patent: December 4, 2012Assignee: NTT DoCoMo, Inc.Inventors: Yusuke Ohwatari, Anass Benjebbour, Tomoyuki Ooya, Junichiro Hagiwara
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Patent number: 8319527Abstract: Methods and systems for analog to digital converter and systems incorporating the same are provided. Specifically, an analog sampler that has a reduced input current is disclosed. According to the present teaching, an apparatus for sampling an input voltage includes a first switch having its first terminal connected to an input voltage, and a first pre-charging circuit, coupled to a second terminal of the first switch, that provides a first pre-charged voltage that is substantially equal to the input voltage. The first pre-charged voltage is provided at the first terminal of the first switch before the first switch is turned on. The apparatus further includes a second pre-charging circuit coupled to both the first pre-charging circuit and the second terminal of the first switch, where the second pre-charging circuit charges the first pre-charged voltage prior to the first switch being turned on.Type: GrantFiled: April 28, 2009Date of Patent: November 27, 2012Assignee: Linear Technology CorporationInventor: Todd Stuart Kaplan
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Patent number: 8310279Abstract: Techniques for providing a comparator incorporating amplitude hysteresis. In an exemplary embodiment, a current offset stage is coupled to a comparator having a folded cascode architecture. The current offset stage offsets the current generated from an input stage to delay switching of the comparator output to implement amplitude hysteresis. In an exemplary embodiment, rail-to-rail input voltages may be accommodated by providing dual NMOS and PMOS input stages. In another exemplary embodiment, the amplitude hysteresis may be controlled by an adjustable threshold voltage. In yet another exemplary embodiment, a constant transconductance gm bias circuit may be provided to maintain the stability of the threshold voltage across input common-mode voltage and/or other variations.Type: GrantFiled: May 18, 2009Date of Patent: November 13, 2012Assignee: QUALCOMM, IncorporatedInventor: Douglas Sudjian
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Patent number: 8311482Abstract: A wireless base station apparatus is provided that is configured to automatically optimize the radiation pattern it uses when installed for operation in a wireless network in order to serve wireless client devices within a coverage area. The wireless base station is configured to determine its geographical location and to evaluate its geographical location based on stored geographical map data that indicates the physical geographical environment surrounding its geographical location. Based on the physical geographical environment surrounding the geographical location, the base station determines a radiation pattern best suited to serve wireless client devices within a coverage area.Type: GrantFiled: April 30, 2009Date of Patent: November 13, 2012Assignee: Cisco Technology Inc.Inventors: Hang Jin, John Grabner
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Patent number: 8299821Abstract: An integrated gate driver circuit includes an output drive circuit and a voltage stabilizing circuit. The voltage stabilizing circuit is configured to stabilize an output voltage outputted by the output drive circuit thereby reducing the ripple of the output voltage.Type: GrantFiled: May 18, 2010Date of Patent: October 30, 2012Assignee: Hannstar Display Corp.Inventors: Yan Jou Chen, Hsien Cheng Chang
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Patent number: 8275322Abstract: An interference relay channel (IRC) utilizes a single relay to assist communications between multiple source-destination links under the half-duplex (HD) constraint. It is assumed that each source has an independent message and its transmitted signal may cause interference at the other destinations. It is also assumed that each node only estimates its backward channels and has no knowledge of its forward channels as well as the other links. The role of the relay is to generate signals to cooperate with the intended signal and mitigate the interference at all destinations.Type: GrantFiled: April 29, 2009Date of Patent: September 25, 2012Assignee: NEC Laboratories America, Inc.Inventors: Mohammad A. Khojastepour, Xiaodong Wang
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Patent number: 8270921Abstract: Systems and methods for tuning an antenna for a frequency modulation (FM) transceiver are provided. A representative system includes: a network of electrical adjustable passive components that receives and sends radio frequency (RF) signals to a receiver circuitry via the network of electrical adjustable passive components. The receiver circuitry determines the received signal strength indication (RSSI) of the RF signal. The system further includes a transmitter circuitry that transmits RF signals via the network of electrical adjustable passive components, and a peak detector circuitry that receives and determines a voltage output of the RF signals from the variable capacitors. An auto-tune circuitry receives the RSSI and output value from the receiver circuitry and the peak detector circuitry, respectively.Type: GrantFiled: April 27, 2009Date of Patent: September 18, 2012Assignee: CSR Technology Inc.Inventors: Noshir Dubash, Thomas E. Ricks, Jr., Richard J. McConnell
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Patent number: 8254830Abstract: A data transmission system transmitting data using a relay is provided. The relay selects a transmission terminal from a plurality of terminals connected to a base station. During a first time slot, the base station transmits base station data to the relay and the transmission terminal transmits terminal data to the relay. The relay transmits the terminal data to the base station and transmits the base station data to the transmission terminal during a second time slot.Type: GrantFiled: May 14, 2009Date of Patent: August 28, 2012Assignees: Samsung Electronics Co., Ltd., Korea University Industrial & Academic Collaboration FoundationInventors: Jun Il Choi, Chang Soon Park, Ki-Hong Park, Young-Chai Ko, Jin Hee Lee
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Patent number: 8249502Abstract: The invention relates to a radio-frequency communication device comprising an inductive antenna in order to communicate with a transponder. According to the invention, the antenna is capable of establishing weak coupling with a transmitter which produces a magnetic field which is substantially homogeneous on the scale of the antenna and is also capable of establishing strong inductive coupling with a transponder located in the vicinity of the device, with the device comprising a transponder interrogation circuit comprising means of sampling and processing the signal on the antenna terminals which are capable of producing a reference signal as a function of said signal; modulation means capable of modulating the reference signal; and application means capable of applying the modulated signal to the antenna terminals.Type: GrantFiled: April 23, 2009Date of Patent: August 21, 2012Assignee: Commissariat à l'Energie AtomiqueInventor: Olivier Savry
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Patent number: 8249538Abstract: An offset direct conversion receiver apparatus and corresponding receiving method are provided. A received wireless signal is directly downconverted and demodulated to a baseband offset frequency that is offset from zero frequency to produce an in-phase (I) baseband offset signal centered at the baseband offset frequency and a quadrature-phase (Q) baseband offset signal centered at the baseband offset frequency. The I baseband offset signal and Q baseband offset signal are bandpass filtered to produce an I bandpass signal and a Q bandpass signal, respectively. The I bandpass signal and the Q bandpass signal are downconverted from the baseband offset frequency to zero frequency to produce an I baseband receive signal and a Q baseband receive signal. A technique and logic are also provided to select the best baseband offset frequency used in an offset direct conversion receiver.Type: GrantFiled: November 24, 2008Date of Patent: August 21, 2012Assignee: Cisco Technology, Inc.Inventors: Hang Jin, John Grabner
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Patent number: 8233866Abstract: A wireless device includes an antenna, Radio Frequency (RF) circuitry, and baseband processing circuitry. The baseband processing circuitry couples to the RF circuitry and is operable to determine operational calibrations settings that may include pre-distortion characteristics and RF signal path settings, both of which are determined via calibration operations. The calibration operations are initiated when an operational value of the wireless device compares unfavorably to at least one operational threshold. Monitoring circuitry coupled to the RF circuitry and to the baseband processing circuitry monitors operational characteristics of the RF circuitry. Calibration operations may be initiated based upon RF circuitry temperature, supply voltage, PA current, PA gain input level/average, among other triggers.Type: GrantFiled: April 28, 2009Date of Patent: July 31, 2012Assignee: Broadcom CorporationInventors: Colin Fraser, Mark Gonikberg, Arya Reza Behzad
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Patent number: 8228112Abstract: A circuit includes an amplifier having an input and an output; and at least one transistor comprising at least one terminal and at least one isolated well. The input of the amplifier is electrically connected to the at least one terminal of the transistor; and the output of the amplifier is electrically connected to the at least one isolated well of the at least one transistor.Type: GrantFiled: May 20, 2008Date of Patent: July 24, 2012Assignee: International Business Machines CorporationInventor: Scott Kevin Reynolds
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Patent number: 8229368Abstract: A data communications system includes a controller device and multiple client devices in data communications with each other over a data communications network. The controller device is configured to issue an instruction to a portion of the client devices that instructs them to acquire an interference characteristic associated with one or more external interference source. The interference characteristic may be measured interference magnitudes associated with a frequency of data communications over the data communications link. The portion of client devices transmits the measured interference magnitudes to the controller device. The controller device then determines a location of one or more interference sources based on the transmitted data.Type: GrantFiled: May 1, 2009Date of Patent: July 24, 2012Assignee: Eden Rock Communications, LLCInventors: Chaz H Immendorf, Eamonn F Gormley
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Patent number: 8222942Abstract: An initialization circuit comprises a section signal generator generating a section signal, of which a prescribed section is enabled in response to a power-up signal, a first oscillator generating a first period signal in response to the section signal, a first period multiplier generating a first multiplied signal by multiplying a period of the first period signal, and a signal selector transferring the first multiplied signal or a second multiplied signal selectively as a self-refresh enable signal in response to the section signal.Type: GrantFiled: June 3, 2009Date of Patent: July 17, 2012Assignee: Hynix Semiconductor Inc.Inventor: Jong Won Lee
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Patent number: 8217713Abstract: A device for providing a high precision current reference comprising a PTAT generator circuit for supplying a voltage, a high precision current reference offset generator circuit for generating a high precision current offset to compensate for variation in a resistance component due to variation in temperature, and a current adding circuit for aggregating the current from the PTAT generator circuit and the current from the high precision current reference offset generator circuit. In one embodiment, a high precision current reference generated is substantially independent of temperature. On-chip resistors may be used to design a high precision current reference. Accordingly, high precision current reference generated maintains high precision with zero temperature co-efficient using on-chip resistors that are substantially cheaper than off-chip resistors.Type: GrantFiled: October 22, 2007Date of Patent: July 10, 2012Assignee: Cypress Semiconductor CorporationInventors: Vijay Kumar Srinivasa Raghavan, Cristinel Zonte
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Patent number: 8212610Abstract: A digital loop filter includes a fine control circuit and a coarse control circuit. The fine control circuit adjusts a phase of a feedback clock signal by a first phase adjustment in response to a first phase error signal that indicates a sign of a phase error between a reference clock signal and the feedback clock signal. The coarse control circuit adjusts the phase of the feedback clock signal by a second phase adjustment in response to a second phase error signal. The second phase adjustment is larger than the first phase adjustment. The second phase error signal indicates a magnitude of a phase error between the reference clock signal and the feedback clock signal.Type: GrantFiled: November 17, 2008Date of Patent: July 3, 2012Assignee: Altera CorporationInventors: William W. Bereza, Mohsen Moussavi, Charles E. Berndt
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Patent number: 8207782Abstract: A circuit to minimize thermally generated offset voltages includes a differential pair of transistors having a first transistor and a second transistor and coupled to a current source, a differential input having a first input coupled to the first transistor and having a second input coupled to the second transistor, a pair of bypass transistors having a first bypass transistor and a second bypass transistor, the first bypass transistor coupled in parallel with the first transistor and the second bypass transistor coupled in parallel with the second transistor, wherein the pair of bypass transistors is coupled to the current source, and control circuitry coupled to the pair of bypass transistors for controlling current through the pair of bypass transistors.Type: GrantFiled: March 1, 2011Date of Patent: June 26, 2012Assignee: HRL Laboratories, LLCInventor: Albert E. Cosand
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Patent number: 8207779Abstract: A control circuit for controlling a switching device having a first terminal, a second terminal, and a control terminal is disclosed. The control circuit includes a first diode for coupling to the first terminal of the switching device, a second diode for coupling to the second terminal of the switching device, a first transistor for coupling to the control terminal of the switching device, and a second transistor coupled to the second diode. The first transistor is coupled to the first diode. The control circuit is configured to allow current flow in only one direction between the first and second terminals of the switching device.Type: GrantFiled: May 16, 2008Date of Patent: June 26, 2012Assignee: Astec International LimitedInventors: Zong Bo Hu, Ying Qu, Kevin Donald Wildash, Wai Kin Chan, Wing Ling Cheng
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Patent number: 8208849Abstract: A filtering circuit with a jammer generator cancels a jammer in wireless signals with little degradation of the signal-to-noise ratio (SNR). The filtering circuit may include a jammer generator which acquires information of period and phase of a sinusoidal jammer signal in a composite input sinusoidal signal, which includes the jammer signal and a desired signal, and outputs a pseudo sine-wave with a period and phase corresponding with the period and phase of the jammer signal acquired, and an adder which outputs a difference between the input and output signals of the jammer generator as the desired signal.Type: GrantFiled: April 29, 2009Date of Patent: June 26, 2012Assignees: NEC Corporation, The Board of Trustees of the Leland Stanford Junior UniversityInventors: Shinichi Hori, Boris Murmann