Abstract: An amplifier includes a first input circuit, a second input circuit, a first compensation circuit, a second compensation circuit. The first input circuit changes a voltage level of the negative output node based on a first input signal. The second input circuit changes a voltage level of the positive output node based on a second input signal. The first compensation circuit changes the voltage level of the positive output node based on the first input signal. The second compensation circuit changes the voltage level of the negative output node based on the second output signal.

Abstract: Bias circuits and methods for silicon-based amplifier architectures that are tolerant of supply and bias voltage variations, bias current variations, and transistor stack height, and compensate for poor output resistance characteristics. Embodiments include power amplifiers and low-noise amplifiers that utilize a cascode reference circuit to bias the final stages of a cascode amplifier under the control of a closed loop bias control circuit. The closed loop bias control circuit ensures that the current in the cascode reference circuit is approximately equal to a selected multiple of a known current value by adjusting the gate bias voltage to the final stage of the cascode amplifier. The final current through the cascode amplifier is a multiple of the current in the cascode reference circuit, based on a device scaling factor representing the relative sizes of the transistor devices in the cascode amplifier and in the cascode reference circuit.

Abstract: A receiver circuit includes a mixer receiving an RF signal encoding an information signal. The mixer receives a number of multiphase oscillator signals and generates multiphase baseband signals. The receiver circuit also includes a variable gain circuit receives the multiphase baseband signals, generates a first output signal having a first distortion, and a second output signal having a second distortion. The variable gain circuit is configured to generate a reduced distortion output signal based on the first and second output signals.

Abstract: A radar transmitter is described. The radar transmitter may include the following: a transmit channel which is designed to receive a local oscillator signal and to generate a high-frequency (HF) radar signal based on the local oscillator signal; a phase shifter contained in the transmit channel which is designed to set a phase of the HF radar signal depending on an input phase value; and a coupler contained in the transmit channel which is designed to receive the HF radar signal and output the HF radar signal at an output contact. A phase controller circuit is assigned to the transmit channel, where the circuit is coupled with the coupler and is designed to receive the local oscillator signal and the HF radar signal, and to adjust the input phase value for the phase shifter based on a phase difference between the local oscillator signal and the HF radar signal.

Abstract: A Digital Power-Amplifier (DPA) system includes a power amplifier (PA) circuit having control inputs and an output for generating output signals, and an adaptive control circuit that comprises an input interface, an output interface, a memory storing an adaptive control algorithm and a processor performing instructions based on the adaptive control algorithm in connection with the memory, wherein the input interface receives input-state signals and output signals of the DPA circuit, wherein the adaptive control algorithm determines, in response to the input-state signals and the output signals, control parameters of control signals transmitted to the control inputs from the output interface for controlling operations of the DPA circuit.

Abstract: A method for calibrating gain in a multi-path subsystem having a first processing path, a second processing path, and a mixed signal return path, may include low-pass filtering an input signal and a mixed signal return path signal generated from the input signal at subsonic frequencies to generate a filtered input signal and a filtered mixed signal return path signal and tracking and correcting for a gain difference between the first processing path and the second processing path based on the filtered input signal and the filtered mixed signal return path signal.

Abstract: A high frequency circuit includes a transmit terminal and a transmit and receive terminal, a power amplifier that amplifies a high frequency signal inputted from the transmit terminal and outputs the high frequency signal toward the transmit and receive terminal, and an output matching circuit that is positioned on a signal path connecting the power amplifier and the transmit and receive terminal and that optimizes the output load impedance of the power amplifier. The output matching circuit includes a matching circuit coupled to an output terminal of the power amplifier, another matching circuit, and a switch that changes a connection between the matching circuits. The power amplifier and the switch are formed at a single semiconductor IC. The matching circuits are formed outside the semiconductor IC.

Abstract: It is provided a method designed, for OFDM-based communication systems, to slightly modify the signal to be emitted before the power amplifier input of the transmitter. The guiding idea is that the minimal IBO value for which the slightly modified signal still fulfills the standard requirements is inferior to the smallest IBO value for which the transmitted signal still meets the standard requirements in terms of EVM and spectral mask without implementing the proposed method.

Abstract: A negative capacitance circuit is connected between a drain and a source of the mixer transistor. With this configuration, the negative capacitance circuit is connected in parallel to a parasitic capacitance generated between the drain and the source of the mixer transistor, and the parasitic capacitance can be canceled out in a wide band by the negative capacitance circuit connected in parallel.

Abstract: A digital predistorter comprising a first predistorter for generating out-of-band and inter-band distortion components for compensating for the static nonlinearity of a nonlinear element, and a second predistorter cascaded with the first predistorter, the second predistorter compensating for the in-band distortion of the nonlinear device wherein the cascade of the first predistorter and the second predistorter compensate for in-band, out-of-band and inter-band distortions when the cascade of the first, the second predistorter and the nonlinear element are driven with multiband signals.

Abstract: Certain aspects of the present disclosure provide techniques for over-the-air digital pre-distortion (DPD) kernel function selection. A method that may be performed by a user equipment (UE) includes transmitting capability information to a base station (BS), indicating a capability of the UE for performing digital pre-distortion (DPD) training, receiving, based on the capability information, a request from the BS to perform the DPD training, performing, based on the received request, the DPD training, wherein performing the DPD training includes: receiving one or more reference signals (RSs) and selecting, based on the one or more RSs, an ordered set of kernel functions. Additionally, the method may include transmitting feedback information to the BS indicating the ordered set of kernel functions.

Abstract: Various technologies described herein pertain to variable gain amplification for a sensor application. A multistage variable gain amplifier system provides variable gain amplification of an input signal. The multistage variable gain amplifier system includes a plurality of amplification stages. The multistage variable gain amplifier system further includes a power detector configured to detect a power level of an input signal received by the multistage variable gain amplifier system. The multistage variable gain amplifier system also includes a controller configured to control the amplification stages based on the power level of the input signal. The multistage variable gain amplifier system can output an output signal such that the amplification stages are controlled to adjust a gain applied to the input signal by the multistage variable gain amplifier system to output the output signal.

Abstract: An apparatus for a mobile communication device adapted for digital pre-distortion that includes a memory and a processor operatively coupled to the memory of the processor. The processor receives a first input signal and also receives a first output signal from a power amplifier that is based on the first input signal. The processor additionally varies compression applied to a second input signal based on the first output signal of the power amplifier, generates a distortion compensation vector for the second input signal based on the first output signal of the power amplifier, and also varies an input excitation signal supplied to the power amplifier based on the first output signal of the power amplifier.

Abstract: An amplifier comprises a common emitter stage coupled to a first and a second input, a common base stage coupled to the common emitter stage and to a first and a second output, and a cancellation path coupled to the common emitter stage and the common base stage and to the first and second outputs. The cancellation path generates a first cancellation signal that is 180 degrees out of phase with a first leakage signal at the first output and a second cancellation signal that is 180 degrees out of phase with a second leakage signal at the second output. The cancellation path comprises a first cancellation transistor coupled to the common emitter stage and the common base stage and to the first output and a second cancellation transistor coupled to the common emitter stage and the common base stage and to the second output.

Abstract: A new radio base station establishes a first and a second component. The first and second component carrier overlap each other. The base station transmits first synchronization signal blocks on the first component carrier. The base station transmits second synchronization signal blocks on the second component carrier interleaved in time with the first synchronization signal blocks.

Abstract: A method of operating a communications system includes receiving a signal at a digital predistorter (DPD), introducing predistortion to the signal using the DPD, and converting the predistorted signal to an analog signal using a digital-to-analog converter having a first bandwidth. The method also includes amplifying the analog signal, sampling the amplified signal using an analog-to-digital converter having a second bandwidth less than the first bandwidth, and extracting coefficients of the DPD from the sampled signal.

Abstract: A power amplifier linearization circuit and related apparatus is provided. In examples disclosed herein, the power amplifier linearization circuit includes an analog pre-distortion (APD) circuit coupled to an input of a power amplifier. Notably, the power amplifier can exhibit linearity response deviation, namely linearity amplitude response deviation and linearity phase response deviation, when amplifying a radio frequency (RF) signal under a compression condition. As such, the APD circuit is configured to receive a control signal corresponding to the linearity response deviation and pre-process the RF signal based on the control signal before providing the RF signal to the power amplifier. As a result, it may be possible to reduce the linearity response deviation in the power amplifier, thus helping to improve linearity and RF performance of the power amplifier.

Abstract: A signal processing method, device and system are provided. A fitting amplitude of an input signal is acquired by performing fitting on the input signal according to a predetermined fitting model. A determination result about whether to apply a gain on the input signal is determined based on the fitting amplitude, and a gain signal is obtained based on the determination result. A delay signal acquired by delaying the input signal is processed based on the gain signal, to obtain an output signal. With the signal processing device and system, a simple structure and a small calculation amount are achieved, and the signal processing efficiency and the signal processing effect are improved.

Abstract: A wireless communication apparatus includes: a processor that performs distortion compensation on a transmission signal by using a distortion compensation coefficient; an amplifying unit that amplifies the transmission signal; and a feedback path that feeds back a feedback signal to the processor. The processor executes a process including: acquiring, from a transmission signal at a first timing and feedback signals at a second timing that is before the first timing and at a third timing that is after the first timing, instantaneous delay associated with propagation delay of the feedback signals in the feedback path; calculating a mean value of the instantaneous delay acquired in a predetermined time period; adding delay associated with the calculated mean value to the transmission signal; and updating the distortion compensation coefficient by using the transmission signal to which the delay is added and the feedback signal.

Abstract: A system may include a forward signal path having a forward gain and configured to receive an input signal at an input and generate an output signal at an output as a function of the input signal, a feedback signal path having a feedback gain and coupled between the output and the input, and a control subsystem configured to operate the forward signal path and the feedback signal path in at least two modes comprising a first mode in which the forward gain is a first forward gain and the feedback gain is a first feedback gain and a second mode in which the forward gain is a second forward gain smaller than the first forward gain and the feedback gain is a second feedback gain larger than the first feedback gain. The control subsystem may cause operation in the first mode when signal content is present in the input signal and may cause operation in the second mode when signal content is absent from the input signal.

Abstract: A circuit includes an amplifier and pre-distortion circuit. The amplifier amplifies a modulated signal. The signal pre-distortion circuit performs a feed-forward pre-distortion of the modulated signal in a signal path in which the amplifier resides. The signal pre-distortion circuit includes: i) an envelope detector configured operative to provide an envelope information describing an envelope of the modulated signal; and ii) a built-in test circuit that determines distortion information describing a distortion in the signal path caused by amplitude variations. The signal pre-distortion circuit performs the feed-forward pre-distortion of the modulated signal on the basis of the distortion information.

Abstract: Apparatus and methods for envelope alignment calibration in radio frequency (RF) systems are provided. In certain embodiments, calibration is performed by providing an envelope signal with a peak along an envelope path, and by providing an RF signal with a first peak and a second peak to a power amplifier along an RF signal path. Additionally, an output of the power amplifier is observed to generate an observation signal using an observation receiver. The observation signal includes a first peak and a second peak corresponding to the first peak and the second peak of the RF signal, and a delay between the envelope signal and the RF signal is controlled based on relative size of the peaks of the observation signal to one another.

Abstract: Systems, methods, and apparatuses for wireless communication are described. Input data for in-phase branch/quadrature branch (I/Q) imbalance or mismatch may be compensated for or non-linear power amplifier noise may be used to generate compensated input data. In some examples, a transmitter may be configured to transmit communications signaling via a first antenna, the transmitter including a filter configured for digital mismatch correction; a receiver may be configured to receive communications signaling via a second antenna; and a switch may be configured to selectively activate a first switch path to couple the transmitter and the first antenna and a second switch path to couple the receiver and the transmitter to provide communications signaling received via the transmitter as feedback for the filter through the receiver.

Abstract: In order to provide an electric tool such that the capacitances of noise-suppressing film capacitors can be increased without increasing the diameter of a handle section, the housing of the electric tool comprises: a body section that stores a brushless motor, a striking mechanism part, and a portion of an output part; a handle section, whose one end is connected to the body section; and a storage section that is formed on the other end of the handle section. A pair of film capacitors for removing noise generated from an inverter circuit are mounted on a capacitor substrate and stored side by side inside the handle section. The film capacitors are connected in parallel with each other, thereby providing a capacitor having a larger total capacitance than before.

Abstract: The response of a Rogowski coil based current measuring circuit is often proportional to frequency. To correct for this a low pass or integrating function is applied to the response to linearize it. The low pass filter is made from real resistors and capacitors, and tolerances in their values significantly affect the estimate of current. This disclosure relates to a way of addressing such problems. This allows consumers of electricity to have confidence in the accuracy of, for example, their electricity meter.

Abstract: The invention refers to determining a channel state performed at a user device, UE (12), of a mobile network, comprising determining (S21) one or a plurality of time intervals that may be used for channel measurements, performing (S22) a plurality of signal power measurements associated each to one of the time intervals to be used for channel measurement and generating a channel state information as a function of the plurality of the signal power measurements; the invention further refers to generating (S11) an information comprising an indication a plurality of time intervals that may be used for received signal power measurements to be sent from an access node, eNB (14) to the UE (12), and evaluating a measurement report received from the UE (12), wherein the report comprises received signal power measurements associated each to one of the time intervals; the invention further refers to a corresponding UE (12), eNB (14) and to corresponding computer programs.

Abstract: Disclosed are implementations, including a method for digital predistortion of multiband signals that includes receiving an input signal comprising multiple signal portions in different frequency bands, the input signal configured to be processed by a transmit chain, of a power amplification system, comprising at least a power amplifier that produces output with non-linear distortions, with the non-linear distortions of the transmit chain being represented using a set of basis functions derived according to a single-band model of the non-linear distortions. The method further includes performing digital predistortion on signal components derived from the multiple signal portions of the input signal using a reduced set of the basis functions that excludes at least some basis functions for at least some cross-terms resulting from a full expansion of the single-band model applied to the multiple signal portions, to produce a digital predistorted signal provided to the transmit chain.

Abstract: The present disclosure relates to plasma generation systems which utilize plasma for semiconductor processing. The plasma generation system disclosed herein employs a hybrid matching network. The plasma generation system includes a RF generator and a matching network. The matching network includes a first-stage to perform low-Q impedance transformations during high-speed variations in impedance. The matching network includes a second-stage to perform impedance matching for high-Q impedance transformations. The matching network further includes a sensor coupled to the first-stage and the second-stage to calculate the signals that are used to engage the first and second-stages. The matching network includes a first-stage network that is agile enough to tune each state in a modulated RF waveform and a second-stage network to tune a single state in a RF modulated waveform. The plasma generation system also includes a plasma chamber coupled to the matching network.

Abstract: A wireless transmission circuit includes a first induction circuit, a second induction circuit, a detection circuit, a first signal adjustment circuit, and a third induction circuit. The first induction circuit is configured to receive a first signal outputted from a power amplifier. The second induction circuit is configured to output the received first signal as a second signal. The detection circuit is configured to detect a common mode signal associated with the first signal. The first signal adjustment circuit is configured to adjust a phase or an amplitude of the common mode signal to generate a third signal. The third induction circuit is configured to receive the third signal and be coupled to the second induction circuit to reduce a second harmonic in the second signal.

Abstract: Method and controller are disclosed for controlling a power amplifier in a radio transmitter. According to an embodiment, a nonlinearity of the power amplifier is determined. A supply voltage to the power amplifier is controlled based on the determined nonlinearity. A radio unit comprising the radio transmitter and a radio device comprising the radio unit are also disclosed.

Abstract: Some embodiments relate to a device, comprising an amplifier and a linearizer, the linearizer comprising a first transistor, the first transistor comprising a first terminal coupled to an input of the amplifier, a second terminal configured to be coupled to a DC supply voltage, and a control terminal configured to control a current flowing between the first and second terminals and configured to receive a DC bias voltage different from a voltage of the first terminal. Some embodiments relate to a device, comprising an amplifier, comprising an input, an output, and a first set of one or more transistors coupled between the input and the output, and a linearizer, comprising a second set of one or more transistors coupled between a DC supply voltage and the input of the amplifier, wherein the first set of transistors and the second set of transistors have a same topology.

Abstract: A method for predistortion comprising receiving a plurality of input signals forming a multiple-input signal in a multiple-input multiple-output system, generating a pre-distorted multiple-input signal from the received multiple-input signal, generating a multiple-output signal by feeding the pre-distorted multiple-input signal into a multiple-input and multiple-output transmitter, estimating impairments generated by the multiple-input and multiple-output transmitter, the impairments comprising nonlinear crosstalk between distinct ones of the plurality of input signals; and adjusting the pre-distorted multiple-input signal to compensate for the estimated impairments.

Abstract: An amplifier circuit is provided that includes an amplifier having a signal input and a signal output, the amplifier being configured to produce an amplified signal at the signal output, a feedback path coupled between the signal output and the signal input, and an amplifier linearity boost circuit positioned in the feedback path. The amplifier linearity boost circuit includes a non-linear current generator and a phase-shifting circuit, the non-linear current generator being configured to provide a non-linear current based on the amplified signal, and the phase-shifting circuit being configured to adjust a phase of the non-linear current to reduce an intermodulation distortion of the amplified signal.

Abstract: A method for generating a control signal for an acousto-optical element includes generating a raw signal using at least one correction term by an IQ modulation from a target I component and a target Q component, and amplifying the raw signal to become the control signal. The target I component and/or the target Q component are corrected using the at least one correction term. The at least one correction term is obtained from an analysis of the control signal.

Abstract: A device and techniques for generating and filtering a signal for transmission, such as the signal used to interrogate distance measuring equipment (DME), which may be tuned to a channel or frequency selected from a wide bandwidth. A system according to the techniques of this disclosure may generate a narrow band intermediate frequency (IF) signal with desired pulse characteristics, mix the IF signal with a local oscillator (LO) to upconvert to the desired radio frequency (RF) signal, then filter the upconverted RF signal through one of several narrow band filters in a filter bank to remove any undesired signal images. The system may select the filter from the filter bank depending on the transmitted RF frequency. In this manner the system of this disclosure may generate signals to span a wide RF bandwidth by using a narrow bandwidth IF signal generator.

Abstract: A power amplifier apparatus supporting reverse intermodulation product (rIMD) cancellation is provided. The power amplifier apparatus includes an amplifier circuit configured to amplify and output a radio frequency (RF) signal for transmission via an antenna port. The antenna port may receive a reverse interference signal, which may interfere with the RF signal to create a rIMD(s) that can fall within an RF receive band(s). A reverse coupling circuit is provided in the power amplifier apparatus to generate an interference cancellation signal based on the reverse interference signal. The amplifier circuit is configured to amplify the interference cancellation signal and the RF signal to create an intermodulation product(s) to suppress the rIMD(s) to a determined threshold. By suppressing the rIMD(s) in the power amplifier apparatus, it is possible to support concurrent transmissions and receptions in a number of RF spectrums while in compliance with stringent regulatory spurious emissions (SEM) requirements.

Abstract: Circuitry includes an amplifier circuit having a first transistor, an inductor, and a second transistor, and a distortion compensation circuit having a third transistor, a forth transistor, and a first capacitor. The first transistor is applied input signal. The inductor is connected to a source of the first transistor and grounded on another side. The second transistor has a source connected to a drain of the first transistor, a grounded gate and a drain connected to a power supply, and outputs an amplified signal. The third transistor has a drain and a gate connected to the drain, and is connected to the power supply on the drain. The fourth transistor has a drain and a gate connected to a source of the third transistor, and is grounded on a source. The first capacitor connects nodes between the drain of the first transistor and the source of the third transistor.

Abstract: Techniques for improving a power supply accuracy of a precision data converter system, such as analog-to-digital converter circuits (ADCs) and digital-to-analog converter circuits (DACs). Improving the power supply accuracy can enable a reference voltage to be as large as possible, thereby increasing the signal-to-noise-ratio (SNR). The techniques can also simplify power supply sequencing requirements for the data converter system.

Abstract: A concurrent multi-band linearized transmitter (CMLT) has a concurrent d a multi-band predistortion block (CDMPB) and a concurrent multi-band transmitter (CMT) connected to the CDMPB, The CDMPB can have a plurality of digital baseband signal predistorter blocks (DBSPBs), an analyzing and modeling (A&M) stage, and a signal observation feedback loop. Each DBSPB can have a plurality of inputs, each corresponding to a single frequency band of the multi-band input signal, and its output corresponding to a single frequency band; each output connect corresponding to an input of the CMLT. The A&M stage can have a plurality of outputs connected to and updating the parameters of the DBSPBs, and a plurality of inputs connected to either both outputs of the signal observation loop or the output of the subsampling loop and to outputs of the DBSPBs. The A&M stage can perform signals' time alignment, reconstruction of signals and compute parameters of DBSPBs.

Abstract: An envelope tracking (ET) amplifier circuit is provided. The ET amplifier circuit includes an amplifier circuit configured to amplify a radio frequency (RF) signal based on an ET modulated voltage. The ET modulated voltage corresponds to a time-variant voltage envelope, which can be misaligned from a time-variant signal envelope of the RF signal due to inherent temporal delay in the ET amplifier circuit. As a result, the amplifier circuit may suffer degraded linearity performance. In this regard, a voltage processing circuit is provided in the ET amplifier circuit and configured to operate in a low-bandwidth mode and a high-bandwidth mode. In the high-bandwidth mode, the voltage processing circuit is configured to cause the ET modulated voltage to be modified to help improve delay tolerance of the ET amplifier circuit. As a result, it may be possible to reduce linearity degradation of the amplifier circuit to a predetermined threshold.

Abstract: An apparatus includes at least one processing device configured to obtain samples of an input signal to be amplified and, in real-time, pre-distort at least some of the samples using pre-distortion values from at least one lookup table. The pre-distorted samples are to be converted into an analog signal that is amplified by at least one power amplifier. The pre-distortion values at least partially compensate for a non-linear operation of the at least one power amplifier. The at least one processing device is also configured to compare an output signal generated by the at least one power amplifier to an expected signal to identify errors between the output and expected signals. The at least one processing device is further configured to update one or more pre-distortion values in the at least one lookup table based on the identified errors.

Abstract: Disclosed are systems, devices, modules, methods, and other implementations, including a method for digital predistortion that includes receiving, by a digital predistorter, a first signal that depends on amplitude variations based on an input signal, u, with the variations of the first signal corresponding to time variations in non-linear characteristics of a transmit chain that includes a power amplifier. The method further includes receiving, by the digital predistorter, the input signal u, generating, by the digital predistorter, based at least in part on signals comprising the input signal u and the first signal, a digitally predistorted signal v to mitigate the non-linear behavior of the transmit chain, and providing the predistorted signal v to the transmit chain.

Abstract: The present invention is a computationally-efficient compensator for removing nonlinear distortion. The compensator operates in a digital post-compensation configuration for linearization of devices or systems such as analog-to-digital converters and RF receiver electronics. The compensator also operates in a digital pre-compensation configuration for linearization of devices or systems such as digital-to-analog converters, RF power amplifiers, and RF transmitter electronics. The multi-dimensional compensator effectively removes linear and nonlinear distortion in these systems by accurately modeling the state of the device by tracking multiple functions of the input, including but not limited to present signal value, delay function, derivative function (including higher order derivatives), integral function (including higher order integrals), signal statistics (mean, median, standard deviation, variance), covariance function, power calculation function (RMS or peak), or polynomial functions.

Abstract: An exemplary embodiment of a low noise amplifier has integral noise cancellation to provide a low noise figure and operation over a frequency range of 40 GHz-60 GHz. An amplifier amplifies an input signal as well as noise present with the amplified signal and amplified noise being out of phase and in phase, respectively, with the corresponding inputs. An auxiliary amplifier amplifies the same inputs and generates an amplified signal and amplified noise both being out of phase relative to the inputs. A summation circuit combines all of these amplified signals with the noise being cancelled since the auxiliary amplifier provides the same amount of amplification as the amplifier and the amplified noise signals being summed are 180 degrees out of phase to each other. Preferably, the amplifier, auxiliary amplifier and the summation device utilize CMOS transistors disposed on an SOI substrate with impedance stabilization over the frequency range.

Abstract: An amplification apparatus includes: at least one voltage converter for converting a voltage of supplied power which is supplied from an external power supply source to the amplification apparatus, to a lower voltage; and at least one amplifier unit operable by supplied power which has the lower voltage as converted by the at least one voltage converter, for amplifying a radio frequency signal.

Abstract: Systems and methods for communicating electromagnetic signals and/or power and, more particularly for example, to power combiners and similar systems and methods for communicating electromagnetic signals and/or power generated by amplifiers to loads, are described herein. In at least example embodiment, a power amplifier system includes first and second amplifier circuits and a power combiner circuit coupled to each of the first and second amplifier circuits and having a first microstrip transmission line component, a slotline formation, and an additional coupling component that is capable of being at least indirectly coupled to a load, where the first microstrip transmission line component and additional coupling component are electromagnetically coupled by way of the slotline formation.

Abstract: Disclosed is a method for producing a stage for amplifying the power of a variable envelope signal including at least one amplifier. For each amplifier, a form of ideal variation in average power POUTL is selected. For each value of each setting parameter and for each average input power value, a value of an optimisation criterion is calculated on the basis of the mathematical expectation of at least one optimisation parameter. An optimum value of each setting parameter is determined and the amplification stage is produced with a number of amplifiers in parallel determined on the basis of an average output power value and with, for each amplifier, matching circuits providing the optimum values of the setting parameters. The invention also relates to an amplification stage produced in this manner.

Abstract: Apparatus and method for extended operational bandwidth amplifiers with fractional instantaneous bandwidth feed forward correction. In one embodiment, the method includes amplifying a radio frequency (RF) input signal to provide an amplified RF signal and introducing a first delay in the amplified RF signal. The method also includes receiving an error signal of the amplified RF signal and centering a correction bandwidth with respect to the amplified RF signal. The method also includes amplifying the error signal and combining the amplified RF signal and the amplified error signal to reduce an error in the amplified RF signal. The first delay is smaller than a second delay caused by the error path.

Abstract: A circuit includes first and second gain stages and an output transistor. The second gain stage includes a transconductance amplifier and a variable impedance circuit coupled to an output of the transconductance amplifier. The variable impedance circuit is configured to implement a first impedance level at frequencies below a first frequency threshold and to implement a second impedance level at frequencies above a second frequency level. The first impedance level is larger than the second impedance level. The output transistor has a control input coupled to the variable impedance circuit. At frequencies above the second frequency threshold, the second impedance level is configured to be inversely related to current through the output transistor.

Abstract: An approach to predistortion of a first set of signals for an antenna array allows beam-steering without corrupting spectrum away from the main beam and where other users may be located. In some implementations, the predistorter uses fewer than one predistorter per signal (i.e., per power amplifier or per antenna), and/or has the computational complexity of such fewer predistorters, to generate predistortions of the first set of signals for amplification and transmission via the antenna array.