Class / Patent application number | Description | Number of patent applications / Date published |
455120000 | Including tuning | 36 |
20080305755 | CHANNEL SEARCHING METHOD AND APPARATUS - A method of identifying an available channel of a plurality of frequency channels defined in a radio frequency spectrum for use by a transmitting station, wherein scanning for an available channel in a frequency spectrum is performed by a scanning method in which a bidirectional search is performed away from an initial channel frequency. The method may include steps to take when a boundary of the spectrum is encountered, and may also take into account existing information concerning channel reservation. A related scanner and radio apparatus is also described. | 12-11-2008 |
20090011726 | Communication Module and Method of Manufacturing the Same - A communication module is provided in which its characteristic of separation between its first and second tuner units is improved. The module is equipped with circuit board ( | 01-08-2009 |
20090270055 | METHOD AND SYSTEM FOR COMPENSATING FOR USING A TRANSMITTER TO CALIBRATE A RECEIVER FOR CHANNEL EQUALIZATION - Aspects of a method and system for compensating for using a transmitter to calibrate a receiver for channel equalization are provided. Various embodiments of the invention may be applicable wireless devices in TDM systems, Bluetooth, and/or WLAN applications, for example. Transmit tones may be generated by a transmitter PLL and the baseband response may be measured for each of the injected tones. The tones may be swept over a frequency range and a corresponding oscillator signal may be mixed with the received signal to determine the response of, for example, the receiver filters. Adjusting any of a plurality of receiver and/or transmitter parameters based on baseband measurements may provide appropriate channel compensation or calibration. Accordingly, the baseband circuitry may generate equalization signals, which may be utilized to adjust receiver and/or transmitter circuitry. This approach may be provide I/Q balancing and transmit filtering calibration after receiver calibration is completed. | 10-29-2009 |
20100248660 | RF Multiband Transmitter with Balun - A multi-band RF transmitter circuit ( | 09-30-2010 |
20100261444 | LOAD MODULATION ARRANGEMENT - The present invention concerns a load modulation arrangement adapted to be connected to an amplifying device. The load modulation arrangement comprises a first reactive element, a second reactive element and at least one variable capacitive element. Further, the load modulation arrangement comprises a quarter wave transforming element adapted to be connected to the first reactive element. The present invention also concerns a method for load modulation, a wireless transceiver and a radio transmission device. | 10-14-2010 |
20110086600 | METHOD AND APPARATUS FOR ANTENNA TUNING - A method for tuning a transmitter in order to improve impedance matching to an antenna or to intermediate radio frequency stages uses an error detector that senses a deviation of the amplitude or phase angle of a load current of a power amplifier driver or of a power amplifier. A controller calculates a correction and dynamically adjusts tunable transmitter parameters, which may include values of components in matching networks or bias voltages in the power amplifier or the power amplifier driver, so as to reduce the deviation and thereby improve the impedance matching. The load current of the power amplifier may alternatively be sensed by measuring the duty cycle of its switching mode power supply. A transmitter having a power amplifier and one or more tunable circuit elements incorporates an error detector that senses the amplitude or phase of a load current and a controller that adjusts one or more tunable parameters to reduce impedance mismatch. An integrated circuit device suitable for use in a transmitter includes a power amplifier driver circuit and a detector circuit capable of sensing a load current, and a controller circuit that can adjust tunable parameters either within or external to the integrated circuit. By eliminating directional couplers and integrating the detectors and power amplifier drivers, the size, complexity, and cost of wireless transceivers can be reduced, while efficiency and power consumption are improved through the dynamic adjustment of operating points and impedance matching. | 04-14-2011 |
20110105058 | SUBBAND INDEXING METHODS AND SYSTEMS - Methods and systems for indexing subband selections are disclosed. The selected subbands can be represented as a binary sequence and the index can be determined by employing a choose function, where a choose function value for a particular selected bit position is defined by a selection occurrence count of the selected bit position that is chosen from a bit position count of the selected bit position. In particular, the index can be the summation of choose function values for each selected bit position. | 05-05-2011 |
20110250858 | FREQUENCY SELECTION AND TRANSITION OVER WHITE SPACE - A method of wireless communication includes determining at least one neighboring apparatus from which to obtain information, obtaining information related to a plurality of channels from the at least one neighboring apparatus, selecting a channel from the plurality of channels based on the obtained information, and transmitting on the selected channel. | 10-13-2011 |
20120046005 | System and Method for Duty Cycle Control of a Crystal Oscillator - In accordance with some embodiments of the present disclosure, an oscillator may include a crystal resonator and a squaring circuit coupled to the crystal resonator and configured to convert a sinusoidal signal produced by the crystal resonator to a square-wave signal, the squaring circuit comprising a bias circuit configured to transmit a selected bias voltage for the squaring circuit, the selected bias voltage selected from a plurality of potential bias voltages. In accordance with this and other embodiments of the present disclosure, an oscillator may include a crystal resonator, an inverter coupled in parallel with the crystal resonator, and a programmable voltage regulator coupled to the inverter. The programmable voltage regulator may be configured to supply a first supply voltage to the inverter during a startup duration of the oscillator, and supply a second supply voltage to the inverter after the startup duration, wherein the second supply voltage is lesser than the first supply voltage. | 02-23-2012 |
20120115425 | CHANNEL SEARCHING METHOD AND APPARATUS - A method of identifying an available channel of a plurality of frequency channels defined in a radio frequency spectrum for use by a transmitting station, wherein scanning for an available channel in a frequency spectrum is performed by a scanning method in which a bidirectional search is performed away from an initial channel frequency. The method may include steps to take when a boundary of the spectrum is encountered, and may also take into account existing information concerning channel reservation. A related scanner and radio apparatus is also described. | 05-10-2012 |
20120238227 | AUTOCORRELATION-BASED SPECTRUM SENSING FOR FM SIGNALS - A method and system for detection of available a white space channel in an area of licensed transmitters includes a detector which utilizes the autocorrelation analysis of a channel in an frequency modulated (FM) band. Calculation of the autocorrelation excludes an initial set of correlation delay values such that large values of autocorrelation are removed. The remaining autocorrelation based on higher correlation delay values exposes the sinusoidal nature of an FM transmitter operating in the selected channel. White space becomes available to a user if no transmitter is detected using the autocorrelation detection method. | 09-20-2012 |
20130040589 | RADIO FREQUENCY TRANSMISSION DEVICE AND METHOD WITH MULTI-MODE AND FULL FREQUENCY BAND - The present invention discloses a multi-mode full frequency band radio frequency transmission device comprising a radio frequency switch chip positioned in the latter stage of the radio frequency main amplifier chip and configured to integrate all solid switch elements. Each of the solid switch elements comprises a transfer switch used when values of a variable capacitor and a variable inductor are controlled. The variable capacitor and the variable inductor are configured to control values of passive elements in an input switch matching circuit/output switch matching circuit to implement a single input/output matching circuit. The present invention further discloses a multi-mode full frequency band radio frequency transmission method comprising controlling values of passive elements in an input switch matching circuit/output switch matching circuit through the variable capacitor and the variable inductor to implement a single input/output matching circuit. | 02-14-2013 |
20130078933 | Method and Apparatus of Minimizing Extrinsic Parasitic Resistance in 60GHz Power Amplifier Circuits - Very high frequency circuits suffer from parasitic resistances. At 60 GHz, conventional layout techniques can introduce loss into the circuit at critical locations. One critical interconnect between the output of a pre-driver and the gate of the final output stage causes 1 or 2 dB of loss due to the layout. By minimizing the number of via contacts, this conventional loss can be recovered using this new layout technique. In addition, a tap point of a via stack is used to modify the resonant characteristics of the interconnect. Finally, cross coupled devices in a resonant circuit are used to reduce the common mode noise at the expense of the common mode gain. | 03-28-2013 |
20130090074 | RF TRANSMITTER FOR ELECTRICALLY SHORT ANTENNA - A synthetic-frequency RF transmitter is provided for transmitting an electromagnetic signal via an electrically short antenna. The transmitter comprises a reactive energy storage with an effective reactance adapted to form with the antenna a resonance circuit with a resonance frequency and a driver adapted to provide to the resonance circuit an electric transmission signal having an instantaneous frequency that varies in dependence on an information signal. The transmitter is characterised in that the transmitter is adapted to dynamically change the resonance frequency by changing the effective reactance in dependence on the information signal. Thus, the instantaneous pass-band of the resonance circuit may be controlled to substantially always comprise the instantaneous frequency of the electric transmission signal and thus of the electromagnetic signal. | 04-11-2013 |
20140155008 | FREQUENCY TUNING SYSTEM AND METHOD FOR FINDING A GLOBAL OPTIMUM - A generator and method for tuning the generator are disclosed. The method includes setting the frequency of power applied by the generator to a current best frequency and sensing a characteristic of the power applied by the generator. A current best error based upon the characteristic of the power is determined, and the frequency of the power at the current best frequency is maintained for a main-time-period. The frequency of the power is then changed to a probe frequency and maintained at the probe frequency for a probe-time-period, which is less than the main-time-period. The current best frequency is set to the probe frequency if the error at the probe frequency is less than the error at the current best frequency. | 06-05-2014 |
20150341059 | Apparatus and Method for Load Modulating an Amplifier - An apparatus is provided for load modulating a power amplifier that is configured to output a multiband radio frequency signal comprising at least a first frequency band and a second frequency band. The apparatus comprises a multiplexer ( | 11-26-2015 |
455121000 | In antenna circuit | 14 |
20080261544 | Techniques for improved adaptive impedance matching - An embodiment of the present invention provides an apparatus, comprising an RF matching network connected to at least one RF input port and at least one RF output port and including one or more voltage or current controlled variable reactive elements; and wherein the RF matching network is tuned to optimize the RF matching network and wherein said tuning is limited by a predetermined number of tuning steps that are taken within a transmit burst and/or limited by the magnitude of each step taken within a transmit burst and/or limited to the steps only being allowed between bursts. | 10-23-2008 |
20090061796 | Antenna arrangement - A multi-part, distributed antenna arrangement including: an antenna element as a first part; and a semiconductor chip as a second part, separated from the first part, wherein the semiconductor chip comprises integrated radio frequency circuitry and a coupling element for wirelessly coupling the integrated radio frequency circuitry with the antenna element. | 03-05-2009 |
20090176465 | FREQUENCY AGILE ANTENNA SYSTEM AND METHOD - A first value of an operational center frequency of a signal to transmit is determined according to received user input. The operational center frequency is centered within a first band of frequencies and the first band of frequencies has a first bandwidth. A single loop antenna is tuned to match the first value of the center frequency and the single loop antenna is arranged and configured to operate across a second band of frequencies having a second bandwidth. The first bandwidth is less than the second bandwidth. The signal is transmitted from the single loop antenna according to the first value of the operational center frequency to provide a transmitted signal. | 07-09-2009 |
20100267350 | TUNING CIRCUITRY IN A COMMUNICATIONS DEVICE - A communications device is provided. The communications device includes a first antenna port coupled to a signal line, transmitter circuitry coupled to the signal line and configured to broadcast a radio frequency (RF) output signal across the first antenna port, tuning circuitry coupled to the signal line, and a controller configured to adjust a tuning of the tuning circuitry. The first antenna port, the transmitter circuitry, the tuning circuitry, and the controller are at least partially integrated on the same integrated circuit. | 10-21-2010 |
20100311363 | METHOD AND SYSTEM FOR A DISTRIBUTED LEAKY WAVE ANTENNA - Methods and systems for a distributed leaky wave antenna (LWA) are disclosed and may include communicating RF signals at one or more frequencies via distributed LWAs in a wireless communication device. The distributed LWAs may be integrated in one or more multi-layer support structures. The RF signals may be communicated at the one or more frequencies via a plurality of cavity heights in the distributed LWAs or via a plurality of sections of the distributed LWAs with different partially reflective surfaces. The distributed LWAs may be configured to transmit the RF signals at a desired angle from a surface of the multi-layer support structures. The distributed LWAs may include microstrip or coplanar waveguides where the plurality of cavity heights of the one or more distributed LWAs may be configured based on distances between conductive lines in the waveguides. | 12-09-2010 |
20110014886 | TECHNIQUES FOR IMPROVED ADAPTIVE IMPEDANCE MATCHING - An embodiment of the present invention provides a method for limiting tuning of a matching network having variable reactive elements coupled to a variable load impedance to at least reduce an undesirable effect caused by an RF signal. Other embodiments are disclosed. | 01-20-2011 |
20110086601 | DYNAMIC REAL-TIME CALIBRATION FOR ANTENNA MATCHING IN A RADIO FREQUENCY TRANSMITTER SYSTEM - Real-time calibration of a tunable matching network that matches the dynamic impedance of an antenna in a radio frequency transmitter system. The radio frequency transmitter system includes two non-linear equations that may be solved to determine the reflection coefficient of the antenna. The tunable matching network is repeatedly perturbed and the power reflected by the antenna is measured after each perturbation at the same node within the tunable matching network. The power values are used by an optimizer in converging to a solution that provides input impedance of the antenna. The elements of the matching circuit are adjusted to match the input impedance of the antenna. | 04-14-2011 |
20120164960 | SAFE AREA VOLTAGE AND CURRENT INTERFACE - A safe area voltage and current interface is provided that includes an antenna and mode selection unit, an antenna tuner unit and an interface unit. The antenna and mode selection unit determines a frequency mode and an antenna mode for an output signal. The antenna tuner unit is directly connected to the antenna and mode selection unit and is configured to tune the output signal based on the frequency mode and the antenna mode determined by the antenna and mode selection unit. The interface unit is directly connected to the antenna tuner unit and is configured to ensure that a current and voltage level of the output signal does not exceed an intrinsically safe current and voltage level, while maintaining the peak current level of the output signal to a level sufficient to drive an electronic component disposed in an unsafe environment. | 06-28-2012 |
20130122836 | PRE-OPTIMIZATION OF TRANSMIT CIRCUITS - An impedance tuning and optimization technique is described wherein an impedance interface is dynamically tuned prior to applying transmit power to the circuit. A coupled signal injected into the antenna port is used to optimize the tuning state of a tuning component such that the impedance properties of the circuit are optimized prior to application of transmit power. A coupled or injected signal at an alternate frequency band can be utilized to determine tuning state or parameters at the frequency of interest by first tuning at the frequency of the coupled or injected signal and then accessing a data base containing information that relates tuning parameters across multiple frequency bands for various levels of antenna de-tuning. A time-savings is realized when the tuning circuit is optimized prior to activation or use of the transmit/receive path. | 05-16-2013 |
20140357205 | Tunable system and method for tuning a system - There is provided a system that includes a tunable amplification module, a coupler, an interface module; a detector that is arranged to output an impedance indicative signal and a power indicative signal; wherein the impedance indicative signal is indicative of an impedance mismatch between an output impedance of the tunable amplification module and an impedance of a radio frequency (RF) antenna as seen by the tunable amplification module, wherein the power indicative signal is indicative of an output power of the tunable amplification module. | 12-04-2014 |
20160065129 | QUADRATURE LC VCO WITH PASSIVE COUPLING AND PHASE COMBINING NETWORK - A circuit and method for generating a signal is disclosed. The circuit includes a set of wide tuning LC tanks, a set of core transistors cross coupled to the set of wide tuning LC tanks, and a combining network coupled to the set of wide tuning LC tanks and the set of core transistors. The combining network further includes a set of inputs connected to the set of wide tuning LC tanks and the set of core transistors, a set of coupling transistors connected to the set of inputs, a set of source inductors connected to the set of coupling transistors, a coupling capacitor connected to the set of source inductors, a load resistor connected to the coupling capacitor. The combining network combines the set of inputs and the signal is delivered to the load resistor as a fourth order harmonic. | 03-03-2016 |
455123000 | Automatically controlled | 3 |
20100124890 | CIRCUIT FOR A LOOP ANTENNA AND METHOD FOR TUNING - A circuit for a loop antenna having a first antenna terminal and a second antenna terminal with an antenna impedance, and method for tuning an overall impedance that has an antenna impedance of a loop antenna and a tuning impedance, with an output amplifier for amplifying a transmit signal that has an output for connection to the first antenna terminal of the loop antenna, with a tuning device designed for automatic tuning that has a terminal, which is separated from the output of the output amplifier for connection to the second antenna terminal, in which the tuning device has an adjustable tuning impedance that is connected to the terminal, in which the tuning device has a measurement device that is connected to the tuning impedance in order to measure a voltage amplitude across the tuning impedance, in which the tuning device has a computing unit that is connected to the measurement device and the adjustable tuning impedance, and in which the computing unit is designed for automatic adjustment of the tuning impedance based on evaluation of the voltage amplitude and the tuning impedance. | 05-20-2010 |
20110217939 | INFORMATION PROCESSING APPARATUS AND ANTENNA FREQUENCY CONTROL METHOD - According to one embodiment, an information processing apparatus includes an antenna, a switch circuit, a wireless communication module and a resonance frequency controller. The switch circuit is configured to switch a resonance frequency band of the antenna between a first resonance frequency band and a second resonance frequency band. The wireless communication module is configured to execute wireless communication by use of the first resonance frequency band and wireless communication by use of the second resonance frequency band. The resonance frequency controller is configured to control the switch circuit in order to set the resonance frequency band of the antenna to one of the first resonance frequency band and the second resonance frequency band based on status information indicating an execution state of wireless communication by use of the wireless communication module. The resonance frequency controller acquires the status information from the wireless communication module. | 09-08-2011 |
20160065246 | COMPUTING DEVICE WITH CONFIGURABLE ANTENNA - A computing device with a configurable antenna. The antenna is configured through a switching circuit operating under software control. Operating characteristics of the antenna are configured based on connections between conducting segments established by the switching circuit, allowing the nominal frequency, bandwidth or other characteristics of the antenna to be configured. Because the switching is software controlled, the configurable antenna may be integrated with a software defined radio. The radio and antenna can be reconfigured to support communication according to different wireless technologies at different times or to interleave packets according to different wireless technologies to support concurrent sessions using different wireless technologies. | 03-03-2016 |
455124000 | Distributed parameter device | 1 |
20090130997 | TRANSMITTING DEVICE AND METHOD OF TUNING THE TRANSMITTING DEVICE - A transmitting device comprising a transmitter, an antenna and a tuning means comprising a matching network connectable between the transmitter and the antenna, the matching network comprising a plurality of capacitors; characterised in that the tuning means further comprises a means of selectively individually adjusting the capacitors to increase the output power of the transmitting device. | 05-21-2009 |
455125000 | Automatic adjustment of tuning | 5 |
20100099369 | AUTOMATIC FREQUENCY TUNING SYSTEM AND METHOD FOR AN FM-BAND TRANSMIT POWER AMPLIFIER - An automatic frequency tuning system and method for a transmit power amplifier. The transmit power amplifier has an antenna feed line including a series capacitor and is coupled to an output of an output driver. In one embodiment, the system includes: (1) a shunt capacitor array having a plurality of capacitors selectably couplable to the antenna feed line to apply a programmable shunt capacitance thereto, (2) a peak detector circuit couplable to nodes of the antenna feed line associated with both terminals of the series capacitor and (3) a processor configured to control the peak detector circuit to determine a ratio of voltage levels measured at the nodes at a given power level of the output driver. | 04-22-2010 |
20140206304 | BEAMFORMING BY SECTOR SWEEPING - A first plurality of training data units are transmitted via a plurality of antennas of a first station as part of a first transmit beamforming training procedure. Subsequently, a second plurality of training data units are received via the plurality of antennas as part of second transmit beamforming procedure while the first station applies a single receive antenna configuration. The second plurality of training data units includes an information element that specifies a feedback from a second station, the feedback including an identifier corresponding to one of the training data units in the first plurality of data units. The first station transmits a feedback message to the second station, that includes (i) one or more indicators of one or more training data units selected from the second plurality of training data units, and (ii) a request to perform a subsequent beamforming training procedure. | 07-24-2014 |
20140213202 | MEDICAL DEVICE COMMUNICATION SYSTEM AND METHOD - A medical device communication system transmitter may include a resonator coupled to a local oscillator for stabilizing an operating frequency of the local oscillator. A control device of the transmitter receives an open-loop control signal, and the local oscillator and the control device are configured to generate a direct modulated radio frequency transmission signal in response to the open-loop control signal. | 07-31-2014 |
20140235186 | RADIO FREQUENCY SIGNAL TRANSMISSION METHOD AND DEVICE - A method for generating a radio frequency signal, wherein a signal to be transmitted is decomposed into a weighted sum of periodic basic signals of different frequencies. | 08-21-2014 |
20140242929 | Method and Arrangement for Transmitting and Receiving RF Signals Through Various Radio Interfaces of Communication Systems - A method and arrangement for transmitting and receiving RF signals, associated with different radio interfaces of communication systems, employ a direct conversion based transceiver which substantially comprises one receive signal branch and one transmit signal branch. Mixing frequencies of the different systems are generated by a single common by use of an output frequency divider in combination with the synthesizer, and by use of filtering corresponding to a system channel bandwidth by means of a controllable low-pass filter operating at baseband frequency. | 08-28-2014 |