3050results about "High frequency amplifiers" patented technology

Aspects of this disclosure relate to a bulk acoustic wave device that includes a multi-layer raised frame structure. The multi-layer raised frame structure includes a first raised frame layer positioned between a first electrode and a second electrode of the bulk acoustic wave device. The first raised frame layer has a lower acoustic impedance than the first electrode. The first raised frame layer and the second raised frame layer overlap in an active region of the bulk acoustic wave device. Related filters, multiplexers, packaged modules, wireless communication devices, and methods are disclosed.

Aspects of this disclosure relate to acoustic wave filters with bulk acoustic wave resonators configured to excite an overtone mode as a main mode. A bulk acoustic wave resonator of the filter can include a plurality of stacked piezoelectric layers positioned between a pair of electrodes.

The invention relates to the technical field of wireless communication, and provides a radio frequency power amplifier and a radio frequency chip, the radio frequency power amplifier comprises an input matching circuit, a first-stage amplifier, a first inter-stage matching circuit, a second-stage amplifier, a second inter-stage matching circuit, a third-stage amplifier and an output matching circuit which are electrically connected in sequence; the radio frequency power amplifier further comprises a control module, a direct current power supply module, a first bias circuit, a second bias circuit and a third bias circuit. The first biasing circuit comprises a power detection network and a switch control circuit; the first input end of the power detection network serves as the first input end of the first bias circuit, the second input end of the power detection network serves as the second input end of the first bias circuit, and the power detection network is used for receiving a radio frequency signal, converting the radio frequency signal into a control voltage in a detection mode and outputting the control voltage to the input end of the switch control circuit. The control switch controls connection or disconnection of the circuit. According to the invention, the robustness of power can be improved.

The invention relates to the technical field of electronic circuits, in particular to a low-noise amplification circuit and a radio frequency system. The low-noise amplification circuit at least comprises an amplification input circuit and an amplification output circuit, wherein at least one group of tail inductor structure is arranged in the amplification input circuit and the amplification output circuit; the first resonance circuit is of a closed structure, the first resonance circuit is in coupling connection with the tail inductor structure, and the first resonance circuit is used for discharging current generated by the tail inductor structure; the first resonance circuit at least comprises a secondary coil which is in coupling connection with a primary coil in the tail inductor structure; and the first end of the first capacitor module is electrically connected with the secondary coil. The invention provides a low-noise amplification circuit with higher working stability.

Aspects of this disclosure relate to generating a bias signal with magnetic field cancellation. A voltage modulator circuit can generate a bias voltage that tracks an envelope of a radio frequency signal. For example, the bias signal can track the envelope of the radio frequency signal that is amplified by a power amplifier on a symbol-by-symbol basis. The voltage modulator circuit includes one or more pairs of switches with magnetic field cancellation.

A power amplifier circuit includes a differential amplifier circuit configured to amplify a radio-frequency signal, a transformer disposed on an output side with respect to the differential amplifier circuit and including a primary winding and a secondary winding, and a dispersion circuit coupled to a midpoint of the primary winding of the transformer and configured to operate as an adjustment circuit. The dispersion circuit is configured to adjust, based on a supply voltage controlled in accordance with the envelope of the radio-frequency signal, a bias (bias current or bias voltage) to be supplied to the differential amplifier circuit.

Examples described herein include methods, devices, and systems which may compensate input data for nonlinear power amplifier noise to generate compensated input data. In compensating the noise, during an uplink transmission time interval (TTI), a switch path is activated to provide amplified input data to a receiver stage including a recurrent neural network (RNN). The RNN may calculate an error representative of the noise based partly on the input signal to be transmitted and a feedback signal to generate filter coefficient data associated with the power amplifier noise. The feedback signal is provided, after processing through the receiver, to the RNN. During an uplink TTI, the amplified input data may also be transmitted as the RF wireless transmission via an RF antenna. During a downlink TTI, the switch path may be deactivated and the receiver stage may receive an additional RF wireless transmission to be processed in the receiver stage.

The invention relates to the technical field of radio frequency signal management, in particular to a radio frequency power supply output power amplification coefficient analysis method and system, and the method comprises the following steps: obtaining the input power, voltage and current parameters of a radio frequency power supply amplifier, calculating the average value of the power supply output power, and analyzing the change trend of the power in a load state. Determining the operation state of the amplifier, and establishing a power output data set. According to the method, the running state of the amplifier is adjusted and optimized in real time by continuously tracking the average value of power output and carrying out detailed analysis on different load states, in addition, accurate adjustment of the amplification coefficient is ensured by quantitatively analyzing the power loss and the fluctuation range, and therefore the amplification effect is optimized, and the reliability of the amplifier is improved. The energy efficiency and the response capability of equipment are remarkably improved, challenges in a complex operation environment are effectively dealt with through fine power stability analysis and dynamic adjustment of an amplification coefficient, and continuous stability and high efficiency of power output are ensured.

Certain aspects of the present disclosure generally relate to electronic components and, more particularly, to circuitry for signal amplification for transmission. One example apparatus generally includes: a modem; a controller; a feedforward path coupled between the modem and the bias controller; and an amplifier having a main amplification path and an auxiliary amplification path, wherein the controller is configured to provide at least one bias signal for biasing the auxiliary amplification path based on information associated with a transmission signal, the information being provided by the modem to the controller via the feedforward path.

Aspects of this disclosure relate to acoustic wave filters with bulk acoustic wave resonators. An acoustic wave filter can include a first bulk acoustic wave resonator configured to excite an overtone mode as a main mode and a second bulk acoustic wave resonator having a fundamental mode as a main mode.

The invention discloses a digital pre-distortion method, system and device and a storage medium, and relates to the technical field of aerospace communication. The method comprises the following steps: acquiring a first input signal and a first actual output signal of the power amplifier, and acquiring a thermal state characteristic; constructing a three-dimensional dynamic baseline; superposing the detection sequence into the first input signal to obtain a second input signal, obtaining a corresponding second actual output signal, and predicting an ideal output signal of the second input signal; extracting a harmonic component generated after the detection sequence passes through a power amplifier, and determining a distortion early warning moment; recording a third input signal after the distortion early warning moment; constructing a virtual test signal according to the third input signal, and predicting to obtain a reference output signal; and comparing the difference between the distortion output signal and the reference output to obtain a distortion feature vector, constructing a dynamic increment compensation function, and correcting the signal processing flow of the power amplifier based on the dynamic increment compensation function. And the accuracy of digital pre-distortion is improved.

The utility model relates to a radio frequency power amplification circuit with a harmonic suppression function and a radio frequency chip. The radio frequency power amplification circuit comprises an input matching unit, a first-stage power amplification unit, a first-stage bias unit, a first-stage power supply unit, an inter-stage matching unit, a second-stage power amplification unit, a second-stage bias unit, a second-stage power supply unit and an output matching unit. According to the utility model, the LC type trap circuits are designed and used in the power supply unit and the inter-stage matching unit, so that secondary, tertiary and high-order harmonic suppression is realized in the radio frequency power amplification circuit; meanwhile, based on LC circuit structures in the power supply unit and the inter-stage matching unit, the inter-stage matching bandwidth is widened, and the linearity of the multi-stage power amplification unit is improved.

The application discloses an RF push-pull power amplifier chip, wherein the second end of the first capacitor is connected to the first pad of the chip, and the second end of the second capacitor is connected to the second pad of the chip, and the first pad is bonded to the second pad by a wire. The first capacitor, second capacitor and wire form an impedance matching circuit, which participates in impedance matching of the chip together with the first balun. In this way, the RF push-pull power amplifier chip can support a larger bandwidth, and the equivalent inductance can be changed by adjusting the length of the wire, so that the impedance matching circuit can be adjusted more flexibly in a limited chip area. Therefore, the bandwidth performance of the RF push-pull power amplifier chip would not be affected, and the occupied area of the chip can be reduced.

Method and device(s) for supporting performance of machine learning based CFR and DPD on multiple digital input signals relating to different frequency bands, respectively, in order to signal condition said signals before power amplification and subsequent transmission in said frequency bands by a wireless communication network. The device(s) obtain said multiple digital input signals as complex valued signals. The device(s) perform feature construction that takes said multiple digital input signals as input and provides constructed feature signals according to predefined constructed feature types as output. Said predefined constructed feature types relate to at least the following per complex valued sample of the obtained complex valued multiple digital input signals the real part of the sample, the imaginary part of the sample and at least one of the absolute value of the sample and the phase of the sample.

Aspects of this disclosure relate to acoustic wave filter. The acoustic wave filter can include different types of acoustic wave resonators. The acoustic wave filter can include shunt acoustic wave resonator that has lower second harmonic distortion than other acoustic wave resonators of the acoustic wave filter. In certain embodiments, the shunt acoustic wave resonator can be a surface acoustic wave resonator. Related multiplexers, radio frequency modules, wireless communication devices, and methods are also disclosed.

An adaptable, generalized digital predistortion system that can increase the accuracy of the distortion applied to a power amplifier input signal is disclosed. Further, the digital predistortion system can be implemented using a reduced circuit area by reducing a number of coefficients used by the models applied to generate the distortion compensation signal. Further, the system can implement an improved digital predistortion adaptation engine that can improve one or more of the following metrics of a complete radio frequency (RF) analog front-end radio signal chain: error vector magnitude (EVM), adjacent channel leakage ratio (ACLR), spectrum emission mask (SEM), and power consumption of the circuits and systems. An example of circuits and systems is a radio frequency power amplifier (PA).

The invention relates to a digital pre-distortion method and system based on a hierarchical iterative neural network, and belongs to the field of digital pre-distortion of power amplifiers. According to the method, the pre-distortion process is decoupled into two stages of off-line generalization training and on-line specialization optimization. In the offline stage, a mixed data set containing multiple modulation modes and bandwidths is adopted to train an offline neural network, and a basic model with high generalization ability is constructed; in the online stage, aiming at a signal with a specific modulation mode and bandwidth, a single configuration data set is utilized to train an online neural network, and the accurate compensation capability of the model on a real-time input signal is enhanced. In practical application, a baseband signal is firstly subjected to targeted preprocessing through the online neural network, then is subjected to deep optimization through the offline neural network, and finally is input into the power amplifier PA. According to the method, through a generalization-specialization double-layer structure, the dynamic response capability and compensation precision of a digital pre-distortion system to a complex signal environment are remarkably improved.

Disclosed in the present invention are a radio frequency front-end module with input clipping protection, and an electronic device. The radio frequency front-end module comprises at least one transmission path, which comprises at least one stage of a power amplifier circuit, and an output matching circuit. Each stage of amplifier circuit comprises at least one clipping circuit and a biasing circuit thereof, and an input matching circuit and a power amplifier, wherein the clipping circuit, the input matching circuit, the power amplifier and the output matching circuit are sequentially connected in series; and the clipping circuit is used for performing clipping processing on an input signal power and then outputting a signal having a relatively small power, and when the input power of the transmission path is greater than a set threshold value, the clipping circuit enables a clipping function, such that the power amplifier is protected by means of reducing the input power.

The invention relates to the technical field of wireless communication, and discloses a digital pre-distortion method for improving the linearity of a power amplifier in a phased array system, which comprises the following steps of: 1, acquiring a nonlinear parameter of the power amplifier under a dynamic load in real time, the nonlinear parameters comprise an input signal amplitude-phase characteristic, a temperature parameter and a quantum tunneling current parameter; 2, generating a pre-distortion compensation signal based on the nonlinear parameter, wherein the pre-distortion compensation signal comprises a quantum phase compensation item and a dynamic phase change compensation item; and step 3, superposing the pre-distortion compensation signal to an original input signal to generate a pre-distortion modulation signal. The linearity of the power amplifier is improved by introducing the quantum phase compensation item and the dynamic phase change compensation item, nonlinear parameters are accurately obtained in real time in a dynamic load environment, and the precision of pre-distortion compensation is improved.

The invention relates to the technical field of radio frequency generator circuits, and provides a phase-locking frequency-stabilizing multi-core control radio frequency system, which processes I / Q signals and constructs a multi-core task allocation and cooperation mechanism through a digital baseband processing module, and performs pre-distortion processing and system scheduling. The double-closed-loop control module is used for stabilizing fundamental frequency, correcting temperature drift and compensating and adjusting frequency swing amplitude; the hybrid power amplification module is used for performing multi-stage hybrid power amplification signal processing and temperature monitoring through a driving stage and output stage combined topology; and the feedback sampling network module collects output signals in real time through a directional coupler and feeds back, adjusts and precisely controls the frequency stability according to the output signals.

Aspects of this disclosure relate to acoustic wave filters with bulk acoustic wave resonators. An acoustic wave filter can include a first bulk acoustic wave resonator configured to excite an overtone mode as a main mode and a second bulk acoustic wave resonator having a fundamental mode as a main mode.

Apparatus and methods for load modulated power amplifiers are provided. In certain embodiments, a load modulated power amplifier system includes a power amplifier that receives a radio frequency signal at an input and provides an amplified radio frequency signal at an output, and a controllable load impedance coupled to the output of the power amplifier. The controllable load impedance receives an envelope signal that changes in relation to an envelope of the radio frequency signal, and the envelope signal is operable to control an impedance of the controllable load impedance to modulate a load at the output of the power amplifier.

A radio-frequency (RF) circuit including: a multi-tone generation circuit configured to generate a multi-tone signal including a plurality of tones; a predistortion circuit configured to predistort the multi-tone signal or a modulation signal and output a predistortion signal; a power amplifier configured to amplify the predistortion signal and output an output signal; and a predistortion modeling circuit configured to model a predistortion model corresponding to the predistortion circuit based on the predistortion signal corresponding to the multi-tone signal and the output signal.

An improved architecture for a radio frequency (RF) power amplifier, impedance matching network, and selector switch. One aspect of embodiments of the invention is splitting the functionality of a final stage impedance matching network (IMN) into two parts, comprising a base set of off-chip IMN components and an on-chip IMN tuning component. The on-chip IMN tuning component may be a digitally tunable capacitor (DTC). In one embodiment, an integrated circuit having a power amplifier, an on-chip IMN tuner, and a selector switch is configured to be coupled to an off-chip set of IMN components. In another embodiment, an integrated circuit having an on-chip IMN tuner and a selector switch is configured to be coupled through an off-chip set of IMN components to a separate integrated circuit having an RF power amplifier.

Amplification circuitry is disclosed that couples neutralization transistors to amplification transistors to neutralize parasitic capacitance of the amplification transistors. Gates of a first amplification transistor and a first neutralization transistor are coupled together, and gates of a second amplification transistor and a second neutralization transistor are also coupled together. Drains of the first amplification transistor and the second neutralization transistor are coupled together, and drains of the second amplification transistor and the first neutralization transistor are also coupled together. Sources of neutralization transistors are coupled together at a node, such that a voltage swing of a first signal in the first neutralization transistor may be canceled by a voltage swing of a second signal in the second neutralization transistor. The node also couples to a resistor that prevents charge building in the neutralization transistors.

The invention relates to the technical field of radio-frequency signal processing, and discloses a 5G radio-frequency signal amplification method and system, and the method comprises the steps: decomposing an obtained radio-frequency signal into a high-frequency sub-band and a low-frequency sub-band through a multilayer wavelet packet, judging whether the radio-frequency signal is sparse in a wavelet packet domain, and carrying out the sparse reconstruction of an LI norm minimization problem if the radio-frequency signal is sparse; obtaining feature data of each sub-band, extracting a nonlinear transfer function of each sub-band through a CNN-GRU network, and carrying out transfer learning pre-training and dynamic adaptation updating; on the basis of dynamic adaptation update ending, layered memory polynomial calculation and layered model joint output construction, layered model parameter optimization is converted into a least square problem to obtain an error compensation function, and resource allocation is dynamically adjusted according to the peak-to-average power ratio of an input signal; and based on power amplifier state data, holographic sensing is performed on nonlinear parameters of the device through a fusion model, and dynamic changes of the device are compensated through multi-stage calibration and calibration delay is controlled.

In one aspect, a method performed by a transmitter in a first device for signaling a nonlinearity profile of distortion of transmissions in a communications network is provided. The method includes generating an amplitude tracking reference signal (ATRS), wherein the ATRS comprises information indicating a nonlinearity profile of distortions of transmissions by the transmitter, and transmitting the generated ATRS towards a second device. In another aspect, a method performed by a receiver in a second device for identifying a nonlinearity profile of distortion of transmissions in a communications network by a transmitter in a first device is provided. The method includes receiving an ATRS from the first device, wherein the ATRS comprises information indicating a nonlinearity profile of distortions of transmissions by the transmitter and identifying the nonlinearity profile of distortion of transmissions by the transmitter based on the ATRS.

Methods and devices to improve nonlinearity performance of low noise amplifiers (LNAs) are disclosed. The described methods and devices reduce the capacitive loading of the LNA amplifying devices on the bypass path of the LNAs when operating in the bypass mode. This is performed by decoupling the active devices from ground to put the amplifying devices in a floating state, thus minimizing the impact of the gate-source capacitances of the amplifying devices on the overall linear performance of the LNA operating in the bypass mode.

An amplifier circuit includes a carrier amplifier connected between a signal input terminal and a signal output terminal, a peak amplifier connected between the signal input terminal and the signal output terminal, a first phase shift circuit connected between the carrier amplifier or the peak amplifier and the signal output terminal, an auxiliary amplifier connected between the signal input terminal and the carrier amplifier, and a second phase shift circuit connected between the signal input terminal and the carrier amplifier.

An impedance matching circuit includes a radiofrequency terminal and a series circuit connected to the radiofrequency terminal, wherein the series circuit comprises at least one reactance and at least one switching element having a drive input. A drive circuit is connected to the drive input and a coupler is connected to the drive circuit so as to an enable signal input. The impedance matching circuit enables short switching times and low losses in the at least one switching element.