Abstract: A communication device includes an integrated circuit having an on-chip thermal sensing circuit that generates a temperature signal based on a temperature of the integrated circuit. A processing module processes the temperature signal to generate temperature information that can be transmitted to a remote device or processes the temperature signal to generate control for adjusting transmit and/or receive characteristics of an RF transceiver.

Abstract: A radio frequency (RF) communications device may include a power amplifier, an antenna, a tunable coupler between the power amplifier and the antenna, a processor, and an exciter module coupled between the processor and the power amplifier and generating an RF signal based upon a baseband signal. The processor may be configured to set the tunable coupler to a desired tuning and thereby defining a transfer function for the tunable coupler, and to generate an inverse transfer function of the transfer function of the tunable coupler. The processor may be configured to perform digital filtering upstream of the power amplifier based upon the inverse transfer function.

Abstract: Circuitry for use in a direct conversion transmitting or receiving chains includes mixing circuitry which converts baseband signal to radio frequency or vice versa. A local oscillator to provide a signal having a first component and a second component at a harmonic of the first to the mixing circuitry. The circuitry has a filter circuit which attenuates signals output at a first frequency by an amount which is low relative and which attenuates signals output at a second frequency by an amount which is high, both being relative to the attenuation of signals output at frequencies other than the second frequency. The filter circuit is tunable to vary the frequencies, and configured such that the second frequency is maintained at a predetermined integer multiple of the first frequency.

Abstract: 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.

Abstract: The present invention relates to the field of data transmission. The invention has application to amplifiers, the transmission of data modulated signals, filters and/or matching circuits connected between an amplifier and a load, radio transmitters, the transmission of data modulated radio signals, filters and/or matching circuits used between a transmitter's power amplifier and an antenna and the field of Radio Frequency Identification (RFID), such as in the transmission of data between a tag and an interrogator. The present invention enables the transmission of phase modulated signals, by adjusting a device's tuning to substantially match the instantaneous frequency of the phase modulated signal.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A non-Foster impedance power amplifier has a current amplifying device coupled in either an emitter-follower or source-follower configuration with a reactive load such as an antenna load. A negative impedance circuit is provided upstream of a gate or base or other control element of said current amplifying device.

Abstract: A communications device is provided. The communications device includes an antenna port, transmitter circuitry configured to broadcast a radio frequency (RF) output signal across the antenna port, and a controller configured to adjust a signal level of the RF output signal in accordance with antenna compensation information. The antenna port, the transmitter circuitry, and the controller are at least partially integrated on the same integrated circuit.

Abstract: A radio frequency front end for a television band receiver and spectrum sensor includes a first plurality of adaptive matching networks connected to a signal summer that combines signals received by the first plurality of antennas respectively connected to the first plurality of adaptive matching networks and outputs a combined signal to each of a second plurality of downconverter/tuners. The downconverter/tuners are respectively or collectively connected to an analog to digital converter that converts output of the second plurality of downconverter/tuners into at least one digital signal that is output to the television band receiver and spectrum sensor.

Abstract: Provided are apparatuses, systems and methods for performing communication using wireless power. According to one general aspect, a communication device using wireless power may include: a controller configured to determine whether a mutual resonance occurs between a target resonator and a source resonator; and a modulator configured to modulate data based on whether the mutual resonance occurs.

Abstract: 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.

Abstract: A wireless commutation device includes: an antenna unit including antennas transmitting and receiving wireless signals; an analog processing unit including transmitting analog circuits and receiving analog circuits processing analog transmitting and received signals; a digital processing unit processing digital transmitting and received signals; an inter-antenna propagation loss determination unit determining propagation losses between the antennas; a loopback transfer function gain acquisition unit acquiring, through loopback of a calibration signal between the antennas, gains of loopback transfer functions between antenna branches; a loopback transfer function gain correction unit correcting the gains by using the propagation losses; a correction coefficient determination unit determining the respective gain ratios among the receiving analog circuits and the transmitting analog circuits by using the corrected gains, and determining correction coefficients by using the gain ratios; and a gain calibration pro

Abstract: 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.

Abstract: A method for compensating a transceiver for impairments includes transmitting a plurality of partial bandwidth training signals using a transmitter. A plurality of response signals of a receiver having a bandwidth and exhibiting receiver impairments is captured. Each response signal is associated with one of the partial bandwidth training signals. Each of the partial bandwidth training signals is associated with a portion of the receiver bandwidth. A plurality of partial compensation filters is generated based on the plurality of response signals. Each partial compensation filter is associated with one of the response signals. The partial compensation filters are combined to configure a receiver compensation filter operable to compensate for the receiver impairments.

Abstract: 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.

Abstract: Aspects of a method and system for matching an integrated system to an antenna utilizing on-chip measurement of reflected signals are provided. In a chip comprising at least a portion of a receiver and at least a portion of a transmitter, a best impedance match between an antenna and the chip may be determined based on on-chip measurement of one or more signals reflected from the antenna. The best impedance match between the antenna and the chip may be determined utilizing a correction algorithm. The correction algorithm may be determined utilizing data from an external test set that measures signals transmitted by the chip via the antenna. The reflected signals may be routed to a signal analyzer via on on-chip directional coupler. The best impedance match may be determined for each of a plurality of frequencies and/or each of a plurality of transmit signal strengths.

Abstract: The present invention relates to a mixer circuit and method of frequency transformation, wherein an input signal is switched in accordance with a first local oscillator signal and in accordance with at least one second local oscillator signal having a smaller duty cycle than said first local oscillator signal, or having a respective predetermined phase shift with respect to said first local oscillator signal. Output signals obtained by the switching in accordance with the first and at least one second local oscillator signals are summed and the polarity of one of said first local oscillator signal and said at least one second local oscillator signal is switched in response to a control input, to thereby switch between a harmonic-rejection mode and a sub-harmonic mixing mode.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, a method involving a step to tune a plurality of tunable reactive elements by measuring a drift in reactance of at least one of the plurality of tunable reactive elements away from a desired reactance. Additional embodiments are disclosed.

Abstract: A signal generator for a transmitter or a receiver for transmitting or receiving RF-signals according to a given communication protocol includes an oscillator and a mismatch compensator. The oscillator is configured to provide a signal generator output signal having a signal generator output frequency and comprises a fine tuning circuit for providing a fine adjustment of the signal generator output frequency based on a fine tuning signal and a coarse tuning circuit for providing a course adjustment of the signal generator output frequency based on a coarse tuning signal.

Abstract: A mobile station with a tunable duplexer is disclosed. The mobile station includes a processor and memory in electronic communication with the processor. The mobile station includes a receive path that has a receive band reject filter in electronic communication with an antenna at a common node. The receive path also includes a receive band pass filter in electronic communication with the receive band reject filter. The mobile station includes a transmit path that has a transmit band reject filter in electronic communication with the antenna at the common node. The transmit path also includes a transmit band pass filter in electronic communication with the transmit band reject filter.

Abstract: A device has an RF mixer, an IF mixer module, a single synthesizer, a frequency divider, a single side band mixer and a frequency quadrupler. The single synthesizer generates a signal to the IF mixer module, the frequency divider, and the single side band mixer. The single side band mixer mixes signals from the single synthesizer and the frequency divider. The frequency quadrupler receives the output of the single side band mixer. The RF mixer is coupled to the frequency quadrupler and the IF mixer module.

Abstract: A communications device is provided. The communications device includes first output stage circuitry configured to generate a first radio frequency (RF) output signal in response to receiving an RF input signal, a first antenna port configured to couple to a first antenna and configured receive the first RF output signal from the first output stage circuitry, second output stage circuitry configured to generate a second RF output signal in response to receiving the first RF output signal, and a second antenna port configured to couple to a second antenna and configured to receive the second RF output signal from the second output stage circuitry. The first output stage circuitry, the first antenna port, the second output stage circuitry, and the second antenna port are at least partially integrated on the same integrated circuit.

Abstract: A system and method is provided for ensuring that time for tuning to another RF channel between two TF frames in TF slicing exists while reception with a single hopping-tuner is enabled, and reception for terminals can be guaranteed when transmitting and receiving common services. An additional time for tuning is introduced for TF-sliced services, where the time for tuning can be inserted either before of after the P1 & P2 symbols, and the symbols allocated for the tuning time can also be used for transmission of low-bit rate services. Alternatively, additional padding bits and a guard period can be added in the event that slots or slot fragments exceed a cyclic transfer border upon time shifting. Alternatively still, the tuning time is represented by a complete TF frame, where the complete TF frame carries services other than those in the first TF frame, so that a service is transmitted in every second TF frame and a receiver can perform tuning during the TF frames which do not carry the service.

Abstract: An embodiment of the present invention provides an apparatus, comprising a transceiver, an antenna tuner connecting the transceiver to an antenna, a power sensor adapted to acquire measurements about transmit power, a receive signal strength indicator (RSSI) adapted to acquire measurements about receive power and wherein the tuner tunes the antenna based upon the transmit and receive measurements to optimize the antenna in both the receive and transmit bands.

Abstract: An adjustable filter is responsive to a control signal to change a frequency response of the adjustable filter based on at least one of a geographic location, frequency spectrum information, and a status of a secondary internal radio. The control signal may shift a center of the pass band from a first center frequency to a second center frequency and/or change a pass band bandwidth from a first bandwidth to a second bandwidth. A transmitter includes an adjustable filter responsive to a control signal and controller configured to select a frequency response of the adjustable filter by generating the control signal based on a geographical location. In one aspect, the geographical location indicates a region of operation of the receiver and the frequency response is selected in accordance with the region.

Abstract: An adjustable filter is responsive to a control signal to change a frequency response of the adjustable filter based on at least one of a geographic location, frequency spectrum information, and a status of a secondary internal radio. The control signal may shift a center of the pass band from a first center frequency to a second center frequency and/or change a pass band bandwidth from a first bandwidth to a second bandwidth. A receiver includes an adjustable filter responsive to a control signal and controller configured to select a frequency response of the adjustable filter by generating the control signal based on a geographical location. In one aspect the geographical location indicates a region of operation of the receiver and the frequency response is selected in accordance with the region.

Abstract: A wireless communication system that concurrently communicates information in multiple regulatory domains to facilitate audio/video media streaming and other high bandwidth operations. One domain may be licensed and the other may be unlicensed. Transmission in the licensed domain may occur in white space in the domain, and the amount of information transmitted in that domain may be limited by regulations. The amount of information conveyed in the licensed domain may also depend on channel conditions in either or both of the domains. As a result, the relative amount of to information transmitted in each domain may vary dynamically. The system includes a transmitter that dynamically determines weighting coefficients applied to each of a plurality of channels to set power levels in both domains to achieve a desired metric for the overall communication. A corresponding receiver assembles the substreams into a stream that can then be displayed or otherwise processed.

Abstract: The present invention provides a method and apparatus for compensating the output of a transmitter stage (50) of a communications system. A communications apparatus has a transmitter stage (50) providing a variable control voltage which varies the power of the transmitter stage. The impedance at the output of the transmitter stage. (50) varies as the power varies. A control generation circuit compares a reference voltage to the variable control voltage to produce a control signal (VvswrC). A compensated load (40) coupled to the output of the transmitter stage (50) has active component (s) whose' impedance varies in response to the control signal (VvsweC) so as to compensate for the impedance at the output of the transmitter stage (50).

Abstract: Implementations and examples of power amplifier devices, systems and techniques for amplifying RF signals, including power amplifier systems based on Composite Right and Left Handed (CRLH) metamaterial (MTM) structures.

Abstract: 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.

Abstract: A digital broadcasting system and a data processing method are disclosed. The method includes receiving a data processing method includes receiving a broadcast signal in which main service data and mobile service data are multiplexed, acquiring transmission-parameter-channel signaling information including transmission parameter information of the mobile service data, and fast-information-channel signaling information, acquiring binding information describing a relationship between at least one ensemble transferring the mobile service data and a first virtual channel contained in the at least one ensemble by decoding the fast-information-channel, and acquiring status information of the first virtual channel, displaying content data contained in the mobile service data according to the binding information and the status information of the first virtual channel.

Abstract: A multi-band handheld communications device includes a transceiver including a transmitter having a transmit filter and a receiver having a receive filter, each of the transmit and receive filters having a bandpass region tunable across multiple bands, and a processor configured to select one of the multiple bands to operate the handheld communications device, and tune each of the transmit and receive filters based on the selected one of the multiple bands.

Abstract: 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.

Abstract: To calibrate a bandpass filter, a received signal strength corresponding to a received communication channel is determined. A variable element of the bandpass filter is adjusted based on the received signal strength of the received communication channel to calibrate the bandpass filter.

Abstract: A frequency synthesizer includes: a first oscillator (1) controlled by a first control device, the first oscillator having a high quality factor that is greater than 300 and produces a first clock signal (2) RF having a fixed frequency, the first control device (30) controlling the frequency of the first controlled oscillator (1) on the basis of a first reference frequency; a second oscillator (3) controlled by a second control device and producing a second clock signal (4); the second control device (31) controlling the frequency of the second controlled oscillator (3) on the basis of a second reference frequency; and an integer frequency divider (5) dividing the frequency of the second clock signal (4) by a variable integer factor N1 and producing a third clock signal (6), the frequency of which is continuously variable by modifying the factor N1 and the control of the second oscillator.

Abstract: A multi-band RF transmitter circuit (30) for a wireless communication device combines a plurality of RF transmission blocks into a single transceiver integrated circuit which includes a shared broadband SVGA (32), a shared tunable balun (34), and an output switching network (38) at the output of the balun to support three different frequency bands. The outputs of the multi-band RF transmitter circuit are connected to separate external power amplifier circuits (42-44), where each power amplifier circuit generates an amplified signal for one of the plurality of predetermined frequency bands.

Abstract: A frequency modulation (FM) transmitter, a broadcast receiver having the same, and a method of transmitting an audio are provided. The FM transmitter selects a specific frequency from among frequencies in FM frequency band, which exclude a frequency in use, and transmits an audio signal over the selected specific frequency. Accordingly, the FM transmitter can transmit the audio signal using the confusion-free or interference-free frequency. As a result, a user can select a frequency to transmit the audio of the broadcast receiver easily.

Abstract: 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.

Abstract: A wide-band amplifier includes a band-pass filter made of an LC parallel resonant circuit and an LCR series resonant circuit. Both the LC parallel resonant circuit and the LCR series resonant circuit are connected in parallel to a current amplifier device. The band-pass filter has a plurality of poles as well as zeros provided therebetween in the s-plane, where some of the zeros are situated at locations other than the s-plane origing to improve a characteristic flatness in a passband. The output terminal of the amplifier device serves as an output terminal for the amplifier, so that the problem of group delay does not occur. A capacitance element between the output terminal of the amplifier and GND absorbs parasitic capacitance as part of constants to prevent degradation of the frequency characteristic.

Abstract: A frequency synthesizer comprises a tunable oscillator (23) which provides an output signal of the frequency synthesizer, and a sampling phase detector (6) which receives the output signal from oscillator (23) and a reference signal and provides a phase difference signal representative of a phase difference between the output signal and the reference signal, which controls the frequency of the oscillator (23). The frequency of the oscillator (23) is further controlled by a frequency difference signal from a frequency detector (3), which is representative of a frequency difference between the output signal and the reference signal.

Abstract: There are provided a matching circuit which is less prone to impedance mismatch even with variations in pattern dimension, and a wiring board, and also a transmitter, a receiver, a transceiver, and a radar apparatus that succeed in offering stable characteristics with the installation of the matching circuit. Characteristic impedance of a first transmission line including a connection portion is varied between a reflection source including a stub portion and a bonding wire serving as a load. Impedance variation is achieved by varying a distance from the connection portion to a back conductor layer coupled thereto with respect to a distance from the stub portion and a transmission line portion to an inner conductor layer coupled to them.

Abstract: A method for tuning quality factor (Q) in a high-Q, high-frequency filter is provided that includes filtering an input signal to generate a filtered signal. The input signal comprises a specified frequency. The filtered signal comprises an actual phase shift with respect to the input signal. The actual phase shift is compared to a desired phase shift for the filtered signal to determine a difference between the actual phase shift and the desired phase shift. The desired phase shift corresponds to the specified frequency. The filter is tuned based on the difference between the actual phase shift and the desired phase shift.

Abstract: 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.

Abstract: A radio-frequency identification (RFID) system is provided that includes an RFID reader that is provided with a capacitor apparatus or circuit that may be used to tune the transmitter to a different frequency to improve communication with an RFID tag. The frequency may be changed by the capacitor circuit automatically providing a different capacitance output to the RFID reader. A tape drive reader and magnetic tape cartridge may be provided in combination with such an RFID system. A method is disclosed for reading a data packet stored on an RFID tag by a reader that can be adjusted by changing the capacitance provided to the RFID reader.

Abstract: Real-time calibration of a tunable matching network that matches the dynamic impedance of an antenna in a radio frequency receiver system. The radio frequency receiver 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 received by the antenna is measured after each perturbation at the same node in the matching network. The measured power values are used by an optimizer in converging to a solution that provides the reflection coefficient of the antenna. The reflection coefficient of the antenna may be used to determine the input impedance of the antenna. The elements of the matching circuit are then adjusted to match the input impedance of the antenna.

Abstract: 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.

Abstract: Aspects of a method and system for matching an integrated FM system to an antenna utilizing on-chip measurement of reflected signals are provided. In this regard a portion of a signal output by an integrated FM radio transmit block and reflected by an antenna may be routed to an on-chip signal analyzer. Accordingly, measurements of the reflected signals may be utilized to configure a matching network in order to provide a best impedance match between the FM radio and the antenna. In this regard, a best impedance match may maximize radiation efficiency and/or radiated power. Additionally, the configuration of the matching network may incorporate a correction algorithm/offset experimentally determined via a calibration utilizing external components.

Abstract: One embodiment relates to a circuit for active loss compensation. The circuit includes a parallel inductor-capacitive (LC) tank circuit having a first single-ended output. A first adjustable capacitor, which includes a first terminal and a second terminal, is coupled to the first single-ended output. The circuit also includes a first pair of transistors having sources coupled to a first common node. One transistor of the first pair of transistors has a drain coupled to the first single-ended output and the other transistor of the first pair of transistors has a gate coupled to the second terminal of the first adjustable capacitor. Other embodiments are also disclosed.