Abstract: A power amplifier power controller in the power amplifier system monitors various operating conditions of the power amplifier, and controls the output transmit power of the power amplifier by coordinated control of both the input drive level to the power amplifier and the gain of the power amplifier. The power amplifier power controller controls the input drive level to the power amplifier so that the input drive level does not change substantially while adjusting the gain of the power amplifier to maximize the transmit power. The power amplifier power controller may also adjust the input drive level by some portion of the overall change required to the power of the power amplifier, while adjusting the gain of the power amplifier by the remaining portion of such overall change.

Abstract: A power amplifier circuit includes an amplifier MOSFET and a predistorter MOSFET. The predistorter MOSFET source and drain are connected together, and the predistorter MOSFET is connected between the gate of the amplifier MOSFET and a second bias voltage signal. This biasing of the predistorter MOSFET causes it to provide a nonlinear capacitance at the gate of the amplifier MOSFET. The combined non-linear capacitances of the amplifier MOSFET and predistorter MOSFET provide predistortion that promotes cancellation of the distortion or nonlinearity contributed by the amplifier MOSFET alone.

Abstract: Provided are a radio frequency identification (RFID) tag and a method for receiving a signal of the RFID tag. The RFID tag includes a voltage generator configured to generate a voltage signal from a received signal, a common gate circuit configured to convert the voltage signal into a current signal, a current/voltage converter configured to the current signal into a voltage signal by using a resistance value, a low-pass filter configured to perform low-pass filtering on the converted voltage signal, a buffer configured to buffer the low-pass-filtered voltage signal within an operation range, and a peak detector configured to detect a peak value from the buffered signal to demodulate information data. The current/voltage converter controls the resistance value to convert the current signal into a voltage signal included within the operation range of the buffer.

Abstract: For each base station, transmit power level variables (I values) for each resource block allocated by the base station are initialized. The I values are used in a model to find sub-gradients for each base station. Neighboring base stations exchange the sub-gradients. For each base station, the base station's sub-gradient and the base station's neighbors' sub-gradients are used in the model to update the I values. Neighboring base stations then exchange the updated I values. For each base station, the base station's updated I value and the base station's neighbors' updated I values are used in the model to update the initial sub-gradients. The updated sub-gradients are then exchanged and used for another update of the I values. After a number of iterations, the I values are used to establish a transmit power level per resource block.

Abstract: Aspects of the disclosure provide a circuit that includes a first circuit, a second circuit, and an adder. The first circuit is configured to generate a first signal by outputting and holding, at a first timing, a first stream in response to an input stream of data. The second circuit is configured to generate a second signal by outputting and holding, at a second timing, a second stream in response to the input stream of data. The adder is configured to add the first signal with the second signal to generate an up-sampled stream for the input stream of data and reduce a frequency component in the up-sampled stream generated by the up-sampling.

Abstract: The present disclosure relates to envelope power supply calibration of a multi-mode RF power amplifier (PA) to ensure adequate headroom when operating using one of multiple communications modes. The communications modes may include multiple modulation modes, a half-duplex mode, a full-duplex mode, or any combination thereof. As such, each communications mode may have specific peak-to-average power and linearity requirements for the multi-mode RF PA. As a result, each communications mode may have corresponding envelope power supply headroom requirements. The calibration may include determining a saturation operating constraint based on calibration data obtained during saturated operation of the multi-mode RF PA. During operation of the multi-mode RF PA, the envelope power supply may be restricted to provide a minimum allowable magnitude based on an RF signal level of the multi-mode RF PA, the communications mode, and the saturation operating constraint to provide adequate headroom.

Abstract: Techniques for transmit power control for multiple antenna transmissions in an uplink are disclosed. A wireless transmit/receive unit (WTRU) generates at least one input stream for transmission and applies a gain factor to each channel. The gain factor is determined based on a reference channel power estimate. The WTRU generates at least two data streams from the input stream for transmission via a plurality of antennas and applies weights to the data streams. The gain factor and/or the weights are controlled such that a transmit power on each antenna is within a maximum allowed value. The WTRU may perform power scaling on a condition that a transmit power on any antenna exceeds the maximum allowed value. The WTRU may scale down an enhanced dedicated channel (E-DCH) dedicated physical data channel (E-DPDCH) first before other channels. For multiple E-DCH streams, the WTRU may calculate an E-DPDCH power offset based on an additional power offset factor due to multiple stream transmission.

Abstract: A transmitter (32) generates a time-varying stabilized bias signal (82) from which an amplifier-generated, sub-RF distortion signal (26) has been canceled. The distortion signal (26) is a byproduct of amplification and is generated due to imperfect linearity and/or other characteristics of a linear RF power amplifier (36). An envelope amplifier (84) includes a high bandwidth differential input, linear, bias signal amplifier (120) and a low bandwidth switching amplifier (122) coupled together to achieve both a high bandwidth and high efficiency. A control loop (154) feeds a portion of the voltage V(t) from a conduction node (146) of the RF power amplifier (36) to one of the differential inputs of the linear bias signal amplifier (120), while a bias control signal (92) drives the other differential input. The portion of voltage V(t) fed to bias signal amplifier (120) is a low power portion from which the RF portion has been removed.

Abstract: A method of operating base station includes determining a first transmit power of a user equipment (UE), which includes determining a serving base station receive power, determining a path loss of the UE to the base station, determining a downlink signal to noise and interference ratio (SNIR) at the UE, and forming the first UE transmit power. Forming the first UE transmit power comprises summing the serving base station receive power, the path loss of the UE to the base station and the downlink SNIR. The method further includes instructing the UE to transmit at the first UE transmit power.

Abstract: Methods of combining semi-persistent resource allocation and dynamic resource allocation are provided. Packets, such as VoIP packets, are transmitted on the uplink and downlink using respective semi-persistent resources. For each mobile device, awake periods and sleep periods are defined. The semi-persistent resources are aligned with the awake periods so that most of the time the mobile device can turn off its wireless access radio during the sleep periods. In addition, signalling to request, and to allocate, resources for additional packets are transmitted during the awake periods, and the resources allocated for the additional packets are within the awake periods. Methods of extending the awake periods in various embodiments are also provided. Methods of determining the first on period are also provided.

Abstract: A communication apparatus, which is capable of communicating with a first apparatus via a first communication interface and communicating with a second apparatus via a second communication interface, determines whether the first apparatus complies with a power-saving function of the first communication interface and selects, based on a result of the determination, a communication interface to be operated when the communication apparatus is set to be in a power-saving state from between the first communication interface and the second communication interface. Depending on an ambient environment, a communication interface to be operated during a power-saving operation is selected to increase a power-saving effect.

Abstract: The present invention relates to clipping thresholds adjustment for Crest Factor Reduction CFR in a radio unit, wherein the radio unit comprises one or more clipping stages that apply respective clipping thresholds to clip input signals, comprising: determining a target threshold for the clipping stages based on a target PAR and the amplitudes or powers of the input signals, estimating the direction in which original PAR of the input signals changes by comparing amplitudes of the clipped signals from the clipping stages with the target threshold, and adjusting the clipping thresholds based on the estimated direction. The present invention also relates to dynamic stage control. With the present invention, clipping thresholds and clipping stages are adaptively changes with dynamic original PAR of input signals and the efficiency of power amplifier is increased with a low implementation cost.

Abstract: 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.

Abstract: A radio frequency (RF) power amplifier system or transmitter includes one or more power amplifiers and a controller that is configured to adjust amplitudes and phases of RF input signals of the one or more power amplifiers and supply voltages applied to the one or more power amplifiers. In embodiments where multiple power amplifiers are used, a combiner may be provided to combine outputs of the power amplifiers.

Abstract: A parallel amplifier, a switching supply, and a radio frequency (RF) notch filter are disclosed. The parallel amplifier has a parallel amplifier output, such that the switching supply is coupled to the parallel amplifier output. Further, the RF notch filter is coupled between the parallel amplifier output and a ground. The RF notch filter has a selectable notch frequency, which is based on an RF duplex frequency.

Abstract: An electronic lock with power failure control circuit includes a lock mechanism having a latchbolt movable between extended and a retracted positions and an electrically powered lock actuator to lock and unlock the latchbolt. The power failure control circuit includes a microcontroller and the lock is connected to a primary power source and an auxiliary power source, preferably supercapacitors and charger that can be turned on by the microcontroller and off when the charger signals a full charge. A power monitor circuit detects low voltage on the primary power supply and sets a power failure interrupt causing the microcontroller to execute power failure instructions that control the actuator so that the lock is placed into a desired locked or unlocked final state during the power failure. upon detection of the return of good power, the system resets the lock.

Abstract: Methods, apparatus and systems are described for a wireless transmit/receive unit (WTRU) to manage its transmission power. A power headroom report (PHR) may be triggered based on changes to backoff or the impacts of backoff. Additional backoff may be used to calculate a maximum output power of the WTRU and may be indicated by a domination indicator to network resources. The WTRU may be configured to eliminate triggers caused by virtual PHRs. Furthermore, the WTRU may be configured to respond to rapid changes to backoff.

Abstract: The present disclosure relates to envelope power supply calibration of a multi-mode RF power amplifier (PA) to ensure adequate headroom when operating using one of multiple communications modes. The communications modes may include multiple modulation modes, a half-duplex mode, a full-duplex mode, or any combination thereof. As such, each communications mode may have specific peak-to-average power and linearity requirements for the multi-mode RF PA. As a result, each communications mode may have corresponding envelope power supply headroom requirements. The calibration may include determining a saturation operating constraint based on calibration data obtained during saturated operation of the multi-mode RF PA. During operation of the multi-mode RF PA, the envelope power supply may be restricted to provide a minimum allowable magnitude based on an RF signal level of the multi-mode RF PA, the communications mode, and the saturation operating constraint to provide adequate headroom.

Abstract: Mobile phone handsets include a CMOS front end configured for operating across multiple transmit and receive frequencies. The front end typically includes multiple receivers, each covering a different band allocated for cellular service, and requires large, expensive and power-intensive A/D converters and DSPs. Front-end circuits disclosed herein operate with a broadband software-defined radio (SDR), and include a receive Low Noise Amplifier (LNA), transmit Power Amplifier (PA), and an antenna matching network. The front-end provides broadband operation using relatively low power, and minimizes noise in the received signal.

Abstract: A transceiver may include an antenna tuning control system operably associated with an antenna tuner to control the current power levels of the transmission signal and the receive signal. The antenna tuner control system may receive transmit power control (TPC) information, which was transmitted to the transceiver from a base station on the receive signal. The TPC information may be utilized to change the current power level of the transmission signal to a desired transmission power level. In addition, the antenna tuner control system may generate receive power control (RPC) information. The RPC information may be utilized to change the current power level of the receive signal to a desired receive power level. The antenna tuner control system is operable to adjust the pass band in accordance with the TPC information and the RPC information.

Abstract: In one embodiment, an apparatus includes a first block configured to decompose an input signal into a positive component and a negative component. The apparatus further includes a second block configured to generate a mixer positive driver component from the positive component and a mixer negative driver component from the negative component and input the mixer positive driver component and the negative driver component into a mixer for a wireless transmitter.

Abstract: A direct current (DC)-DC converter that includes a first switching converter and a multi-stage filter is disclosed. The multi-stage filter includes at least a first inductance (L) capacitance (C) filter and a second LC filter coupled in series between the first switching converter and a DC-DC converter output. The first LC filter has a first LC time constant and the second LC filter has a second LC time constant, which is less than the first LC time constant. The first switching converter and the multi-stage filter form a feedback loop, which is used to regulate the first switching power supply output signal based on the setpoint. The first LC filter includes a first capacitive element having a first self-resonant frequency, which is about equal to a first notch frequency of the multi-stage filter.

Abstract: For regulating a transmission power in a transmission channel of a transmission from a transmitting station in a transmission system, a transmit power command is received from a transmission receiving station, the transmission power in the transmission channel is changed on a basis of the received transmit power command, and an amount of the change in the transmission power at the transmitting station is determined by determining a ratio between a current transmission power and an average over time of the transmission power, such that the amount of the change is dependent on a value of the ratio, with the amount of change increasing as the value of the ratio increases.

Abstract: Method of cutting off a transmission signal of a main transmitter relayed by a cell of a base station and associated system. According to this method, the transmission signal is cut off:—if the power of the transmission signal emitted by the main transmitter is greater than the power of each transmission signal of other transmitters relayed by the same cell of the base station, and—if the power of the transmission signal of the main transmitter does not decrease after several identical successive transmitted-power regulating commands (TPC) emitted by the base station.

Abstract: A signal transmitter includes a carbon nanotube antenna and a heat to electricity conversion device, which powers an amplifier in the transmitter. The heat from the inefficiency of the antenna is conducted to the heat to electricity conversion device. Additional heat from the transmitter electronics and any other inefficient processes can also be conducted to the heat to electricity conversion device. In this manner, the overall efficiency of the carbon nanotube antenna can be substantially increased.

Abstract: Various embodiments are directed to apparatuses and methods to generate a first signal representing modulation data and a second signal representing an amplitude of the modulation data, the first signal and the second signal to depend on an output signal and vary a power supply voltage to a gain stage in proportion to the amplitude of the modulation data.

Abstract: An analog envelope shaper within an envelope tracking power amplifier system detects an envelope voltage of a transmission signal and generates a shaped envelope amplifier control signal based upon a programmable threshold, below which the output does not fall, and a plurality of different voltages centered around a corresponding threshold input voltage, a selectable spacing of which controls the shape of the transition between negative clipping and linear regions of the envelope detector output function. The programmable features and the resulting piecewise linear shaping allow for tailoring of the envelope response to balance linearity and efficiency, without negating the efficiency benefits of envelope tracking power amplification. Since the analog envelope shaper employs no high speed data converter functions, the resulting power dissipation will be substantially less than digital designs.

Abstract: A dynamic bias circuit for an active RF circuit includes an RF sensor coupled to the input port of the active RF circuit to sense the amplitude of the incoming RF signal. A control circuit is coupled to the RF sensor and a bias source. The bias signal to the active circuit is dynamically adjusted by summing the amplitude of the incoming RF signal with the nominal DC signal from the bias source. As the power in the incoming RF signal increase, so to does the bias signal to the active circuit, which allows the active RF circuit to increase its linear range of operation in the presence of stronger signals. The active circuit is designed such that its gain and phase behavior is nearly constant over large bias adaptation ranges without distortion when bias adjustments are dynamically made to the active circuit.

Abstract: A method for increasing data rate in wireless communications includes selectively activating a plurality of hardware accelerators, and performing, using the hardware accelerators, data processing for modem data based on parameters received from a processor.

Abstract: Methods and systems for controlling power for a power amplifier utilizing a leaky wave antenna (LWA) are disclosed and may include configuring one or more power amplifiers (PAs) in a wireless device at a desired output power level. The PAs may be coupled to feed points on the LWAs that may exhibit an input impedance corresponding to an output impedance of the PAs. RF signals may be transmitted utilizing the LWAs. A resonant frequency of the LWAs may be configured utilizing micro-electro-mechanical systems (MEMS) deflection. The LWAs may be configured to transmit the RF signals in a desired direction. The LWAs may comprise microstrip or coplanar waveguides, wherein a cavity height of the LWAs is dependent on spacing between conductive lines in the waveguides. The input impedances of the feed points may be dependent on a position of the feed points in the cavities.

Abstract: A radiation power level compliance and control scheme for a wireless user equipment (UE) device including one or more tunable elements. The wireless UE device comprises a component configured to detect one or more changes with respect to at least one operational parameter associated with the wireless UE device. A component is provided for determining that a tunable action is required with respect to at least one of the tunable elements. Upon defining one or more tunable element settings, a component is configured to determine a Specific Absorption Rate (SAR) value, which is compared against an acceptable limit. If the SAR is within the limit, appropriate tuning control signals are provided to the tunable elements according to the defined tunable element settings. If the SAR is not within the limit or is about to exceed the limit, then the tunable element settings may be changed and retested.

Abstract: This invention includes a waveform analyzing means (13) for calculating an estimated value of a back-off value required by a power amplifier (2), which amplifies a high-frequency signal generated from a baseband signal (I, Q) to a predetermined transmission power, by analyzing the waveform of the baseband signal (I, Q), and a control means (14) for controlling at least one of the amplitude of high-frequency power input to the power amplifier (2) and the supply power of the power amplifier (2) on the basis of the estimated value. The invention calculates the estimated value of a back-off value by analyzing the waveform of a baseband in this manner, and hence need not generate a table in advance by calculating a back-off value for each combination of code channels. The invention can therefore be applied to even a case in which the number of code channels greatly increases, and can effectively prevent an increase in adjacent channel leakage power due to a signal obtained by multiplexing these code channels.

Abstract: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.

Abstract: A technique for a reconditioning equalizer filter for non-constant envelope signals is described. The input to a transmitter chain is modified by a reconditioning equalizer filter, prior to being applied to the transmitter. The reconditioning equalizer filter modifies and smoothens the amplitude of the signal. The modified and smoothened signal has its peaks reduced which results in lower Crest Factor. The input to the reconditioning equalizer filter could be a baseband, intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal, it needs to be down-converted to baseband before being applied to the reconditioning equalizer filter. The reconditioning equalizer filter could be performed in a digital or analog domain.

Abstract: A reverse power control method includes: a base station presetting reverse outer loop threshold values according to radio configuration (RC) types; in the accessing process of a terminal, the base station selecting the preset reverse outer loop threshold value according to the RC type fed back by the terminal; the base station receiving the Eb/Nt of the reverse channel and comparing the received Eb/Nt with the selected reverse outer loop threshold value, if the Eb/Nt is larger than the reverse outer loop threshold value, the base station instructing the terminal to decrease the transmitting power; if the Eb/Nt is smaller than the reverse outer loop threshold value, the base station instructing the terminal to increase the transmitting power, so as to guarantee that the terminal accesses successfully. An apparatus for implementing reverse close loop power control and an apparatus for implementing reverse outer loop power control are also provided.

Abstract: Apparatus and methods for envelope tracking calibration are provided. In one embodiment, a method of calibrating an envelope tracker having an envelope shaping table generated at a desired gain compression of a power amplifier is provided. The method includes generating a supply voltage for the power amplifier using the envelope tracker, operating the supply voltage of the power amplifier at a first voltage level associated with substantially no gain compression of the power amplifier, and measuring an output power of the power amplifier at the first voltage level. The method further includes decreasing a voltage level of the supply voltage one or more times and measuring the output power at each voltage level, determining a second voltage level of the power amplifier associated with a gain compression equal to about that of the desired gain compression, and calibrating the envelope tracker based on the determination.

Abstract: Techniques and architecture are disclosed for providing an ultra-wideband, multi-channel solid-state power amplifier architecture. In some embodiments, the architecture includes a power divider which splits an input signal and delivers that split signal to a plurality of downstream channel chipsets. Each channel chipset is configured to amplify a sub-band of the original full-band input signal and to provide the resultant amplified sub-band for downstream use, such as for transmission by an antenna operatively coupled with that channel. In the aggregate, the amplified sub-bands provide coverage of the same ultra-wideband frequency range of the original input signal, in some cases. In some embodiments, the architecture provides high radio frequency (RF) power with good amplifying efficiency and ultra-wide instantaneous frequency bandwidth performance in a small-form-factor package.

Abstract: A voltage regulator for a plurality of radio frequency subcircuits of a radio frequency circuit. A first transistor configured to receive, based on a comparison between a reference voltage signal and a feedback signal, a bias signal corresponding to a desired regulated voltage for the plurality of radio frequency subcircuits, output the bias signal, and generate the feedback signal according to the bias signal as output from the first transistor. A second transistor configured to receive the bias signal as output from the first transistor and provide, based on the bias signal, the desired regulated voltage to a respective first one of the plurality of radio frequency subcircuits. A third transistor is configured to receive the bias signal as output from the first transistor and provide, based on the bias signal, the desired regulated voltage to a respective second one of the plurality of radio frequency subcircuits.

Abstract: A method in which user equipment transmits a signal in a distributed antenna system in which a plurality of antennas is distributed in a cell, comprises the following steps: receiving uplink antenna information from a base station; controlling uplink power on the basis of the uplink antenna information; and transmitting an uplink signal on the basis of the uplink power control, wherein the uplink antenna information indicates a receiving antenna of the base station that receives the uplink signal.

Abstract: A mobile wireless communications device may include a portable housing and a near-field communication (NFC) circuit carried by the portable housing and being switchable between first NFC mode and a second NFC mode. The mobile wireless communications device may further include a processor carried by the portable housing and coupled to the NFC circuit and configured to switch the NFC circuit between the first NFC mode and the second NFC mode at a first frequency based upon a first triggering event, and switch the NFC circuit between the first NFC mode and the second NFC mode at a second frequency lower than the first frequency based upon a second triggering event different than the first triggering event.

Abstract: A configurable 2-wire/3-wire serial communications interface (C23SCI), which includes start-of-sequence (SOS) detection circuitry and sequence processing circuitry, is disclosed. When the SOS detection circuitry is coupled to a 2-wire serial communications bus, the SOS detection circuitry detects an SOS of a received sequence based on a serial data signal and a serial clock signal. When the SOS detection circuitry is coupled to a 3-wire serial communications bus, the SOS detection circuitry detects the SOS of the received sequence based on a chip select (CS) signal. In response to detecting the SOS, the SOS detection circuitry provides an SOS detection signal to the sequence processing circuitry, which initiates processing of the received sequence using the serial data signal and the serial clock signal. The received sequence is associated with one of multiple serial communications protocols.

Abstract: A method to control adjustable power levels uses a network of attenuators that includes a fixed attenuation and a variable attenuation. The method adjusts the variable attenuation to approach the fixed attenuation, provides gain to an attenuated signal in an amount proximate to the fixed attenuation to generate a compensated signal, and compares power levels of a non-attenuated signal and the compensated signal to generate a first error signal. The method introduces the fixed attenuation and correspondingly reduces the variable attenuation to maintain a combined attenuation. The combined attenuation generates a modified compensated signal. The method measures a difference between the first power levels of the non-attenuated signal and the modified compensated signal to generate a second error signal, and generates a control signal as function of the first and second error signals to adjust the variable attenuation to reduce an attenuation mismatch introduced between the fixed and variable attenuations.

Abstract: Radio frequency (RF) power amplifier (PA) circuitry, which transmits RF signals is disclosed. The RF PA circuitry includes a final stage, a final stage current digital-to-analog converter (IDAC), and a final stage temperature compensation circuit. A final stage current reference circuit may provide an uncompensated final stage reference current to the final stage temperature compensation circuit, which receives and temperature compensates the uncompensated final stage reference current to provide a final stage reference current. The final stage IDAC uses the final stage reference current in a digital-to-analog conversion to provide a final stage bias signal to bias the final stage. The temperature compensation provided by the final stage temperature compensation circuit is selectable.

Abstract: An automatically configurable 2-wire/3-wire serial communications interface (AC23SCI), which includes start-of-sequence (SOS) detection circuitry and sequence processing circuitry, is disclosed. When the SOS detection circuitry is coupled to a 2-wire serial communications bus, the SOS detection circuitry detects an SOS of a received sequence based on a serial data signal and a serial clock signal. When the SOS detection circuitry is coupled to a 3-wire serial communications bus, the SOS detection circuitry detects the SOS of the received sequence based on a chip select (CS) signal. The SOS detection circuitry provides an indication of detection of the SOS to the sequence processing circuitry, which initiates processing of the received sequence using the serial data signal and the serial clock signal upon the detection of the SOS. As such, the AC23SCI automatically configures itself for operation with some 2-wire and some 3-wire serial communications buses without external intervention.

Abstract: A near field RF communicator has an antenna circuit to couple with the H field of an RF magnetic field and a power supply deriver to derive a rectified auxiliary power supply from the received magnetic field. Rectification may be performed using an actively switched rectifier having a passive mode of operation. A sub regulation system is provided to regulate the auxiliary power supply to inhibit the possibility of temporally varying power requirements of the near field RF communicator or its host causing an apparent load modulation of a signal that is transmitted or received by the communicator.

Abstract: RF signal amplifiers are provided that include an RF input port, a switching device having an input that is coupled to the RF input port, a first output and a second output, a first diplexer having an input that is coupled to both the first output of the switching device and the second output of the switching device, and a first RF output port that is coupled to an output of the first diplexer. These amplifiers further include an attenuator that is coupled between the second output of the switching device and the input of the first diplexer.

Abstract: Electronic devices such as portable computers may contain circuits that generate radio-frequency noise. The radio-frequency noise may interfere with the operation of sensitive circuitry such as wireless communications circuitry. The circuits that generate the radio-frequency noise may include differential signal drivers that drive signals onto communications lines such as lines in a bus or output interface. A control circuit may power the drivers at an adjustable driver voltage bias level. The amount of noise that is generated by the drivers may vary as a function of the voltage bias level and may produce different amounts of noise at different wireless frequencies. Computer lid position and other factors may also influence the amount of interference that is generated. The control circuit may determine the current operating state of the device and may make voltage bias level adjustments that minimize interference between the drivers and the wireless circuitry.

Abstract: Aspects of a method and system for calibrating a power amplifier are provided. In this regard, one or more reference signals may be generated and may be utilized to characterize a signal strength indicator (SSI). Additionally, measurements of power output by a power amplifier by the SSI may be corrected based on the characterization of the SSI. Accordingly, the power amplifier may be adjusted based on the corrected measurements. The reference signals utilized to characterize the SSI may be limited to a determined range. In this regard, signal strength of the reference signals, as measured by the SSI, may be compared to the expected signal strength in order to characterize the SSI. The SSI may be characterized over a range of frequencies and/or signal strengths. Similarly the power amplifier may be adjusted over a range of frequencies and/or signal strengths.

Abstract: Embodiments of the present invention disclose a method for controlling terminal signal transmission, and a terminal. A method for controlling terminal signal transmission includes: monitoring a current working mode of a terminal; transmitting a signal according to first transmit power if it is found through monitoring that the terminal is currently in a first working mode, and transmitting the signal according to second transmit power if it is found through monitoring that the terminal is currently in a second working mode, where the first transmit power is greater than the second transmit power. The technical solution of the embodiments of the present invention helps to enable the terminal to obtain as good radio reception and transmission performance as possible at a same radiation absorption index.

Abstract: An equal gain composite beamforming technique which includes the constraint that the power of the signal output by each antenna is the same, and is equal to the total power of the transmit signal divided by the number N of transmit antennas from which the signal is to be transmitted. By reducing output power requirements for each power amplifier, the silicon area of the power amplifiers are reduced by as much as N times (where N is equal to the number of transmit antennas) relative to a non-equal gain composite beamforming technique.