367 results about "RF power amplifier" patented technology

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 discloses a design optimization method of a radio frequency power amplifier, and relates to the technical field of design optimization. The method comprises the following steps: collecting the working frequency and the circuit topological structure of the radio frequency power amplifier, establishing a digital twin simulation model, and generating an initial impedance value; simulation performance indexes of the amplifier under the input signal are obtained through simulation; matching network parameters are adjusted according to a dynamic reconstruction matching network algorithm, and a dynamic optimization impedance set is generated; controlling the tunable element to reconstruct the actual impedance value of the radio frequency power amplifier, and collecting the actual performance index of the output signal; comparing an error between the simulation performance index and the actual performance index, and if the error exceeds a preset error threshold, iteratively updating a parasitic parameter of the digital twinborn model; and if the error is within the threshold value, locking the actual impedance value as the optimal configuration, and amplifying and outputting the input signal. The working efficiency of the radio frequency power amplifier is improved.

The invention discloses a satellite terminal adaptive power adjusting system. The system comprises an attitude sensor module used for collecting three-dimensional attitude data of a terminal; the antenna pattern database is used for storing theoretical gain values of the panel omnidirectional antenna in different attitudes; the gain prediction engine is used for calculating theoretical gain according to the current attitude data and the directional diagram database; the signal quality detection module is used for collecting the intensity, the signal-to-noise ratio and the bit error rate of the received signal in real time; the power control algorithm module fuses the gain prediction value and the signal quality feedback and is used for generating a dynamic transmitting power instruction; the radio frequency power amplifier is used for executing the power adjusting instruction and outputting an adjusted transmitting signal; the invention further discloses a satellite terminal self-adaptive power adjusting method. According to the invention, the problem of balance between satellite terminal communication stability and power consumption efficiency in a complex environment is solved.

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).

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.

One or more aspects of the techniques and models described herein provide for bidirectional recurrent neural network (BiRNN)-based digital pre-distortion techniques for radio frequency (RF) power amplifiers (PAs). As an example, a digital pre-distorter (DPD) system may implement residual learning and long short-term memory (LSTM) projection layer features to reduce computational complexity and memory requirements. Implementing the described unconventional techniques of applying residual learning in RNN (e.g., in BiLSTM), using LSTM projection to develop a DPD structure, or both, may provide several advantages over preexisting techniques. For instance, the complexity in training and pre-distortion may be reduced and significantly less memory may be required to store the DPD neural network coefficients (e.g., while achieving similar or better linearization performance compared to other LSTM models). Further, faster training convergence speed may be achieved (e.g., compared to other LSTM models).

The invention provides a radio frequency power amplifier circuit and radio frequency power supply equipment. The radio frequency power amplifier circuit comprises a direct current source, a radio frequency inversion unit, a coupling unit and a power adjusting unit. The direct-current source is used for outputting direct-current electric energy. The radio frequency inversion unit is connected with the direct current source, and the radio frequency inversion unit is used for receiving the direct current electric energy and inverting the direct current electric energy into radio frequency electric energy. The coupling unit comprises a first winding and a second winding which are coupled, the first winding is connected with the radio frequency inversion unit, the second winding is used for being connected with a load, and the coupling unit is used for coupling and outputting radio frequency electric energy to the load. The power adjusting unit is connected between the radio frequency inversion unit and the first winding or between the second winding and a load, and the power adjusting unit is used for reducing the current value of radio frequency electric energy output by the radio frequency inversion unit or reducing the current value of radio frequency electric energy output by the coupling unit in a coupling mode. Therefore, the current value of the radio frequency electric energy provided to the load is reduced. According to the invention, the radio frequency power amplifier circuit can be protected.

According to the radio frequency power amplifier and the radio frequency chip provided by the utility model, the input end of the input matching circuit is used for receiving a radio frequency signal, the output end of the input matching circuit is connected with the input end of the power amplifier, and the first end of the filter circuit is used for connecting an external power supply voltage; the output end of the power amplifier is connected with the second end of the filter circuit, the first end of the trap circuit and the input end of the strong coupling transformer, the second end of the trap circuit is grounded, the output end of the strong coupling transformer is used for outputting radio frequency signals, the first end of the high-order trap circuit is connected with the output end of the strong coupling transformer, and the second end of the high-order trap circuit is grounded. And the second end of the high-order trap circuit is grounded. Compared with the prior art, the radio frequency power amplifier has the advantages that the radio frequency matching area is effectively reduced, the space and the cost of the radio frequency power amplifier are saved, and meanwhile, the efficiency and the performance of the radio frequency power amplifier are effectively improved through the structural design of the strong coupling transformer.

A portable magnetic resonance (MR) imaging system is disclosed, including a housing including an array of magnets, a radio frequency (RF) coil assembly, a RF power amplifier, a primary control circuit and a safety control circuit. The RF power amplifier is configurable from a default configuration to an enabled configuration. The system can further include a thermocouple positioned to monitor a temperature.

The present application relates to the technical field of data processing. Disclosed are a multi-nuclear imaging radio frequency power amplifier and a multi-nuclear magnetic resonance imaging hardware system. The multi-nuclear imaging radio frequency power amplifier comprises: a radio frequency signal input end, a radio frequency switch, a pre-compensation circuit, a voltage-controlled attenuator, a voltage-controlled phase shifter, a broadband radio frequency power amplifier, a broadband directional coupler and a radio frequency signal output end; a first output abnormality protection control circuit; a second output abnormality protection control circuit; an amplitude control circuit; and a phase control circuit. By means of the multi-nuclear imaging radio frequency power amplifier in the present invention, nonlinear correction can be performed on the amplitude and phase of a broadband radio frequency power amplifier, such that the broadband radio frequency power amplifier keeps meeting the requirements for high linearity and high power at an operating frequency point of a corresponding nuclide, so as to ensure the linear relationship between input and output signals of a radio frequency power amplifier and adequate signal strength, thereby avoiding the generation of artifacts due to signal distortion, and ensuring the accuracy and clarity of magnetic resonance imaging.

A portable magnetic resonance (MR) imaging system is disclosed, including a housing including an array of magnets, a radio frequency (RF) coil assembly, a RF power amplifier, a primary control circuit and a safety control circuit. The RF power amplifier is configurable from a default configuration to an enabled configuration. The system can further include a thermocouple positioned to monitor a temperature.

The embodiment of the invention provides a radio frequency power amplifier and a radio frequency front-end module. The radio frequency power amplifier comprises a first radio frequency amplification circuit, a second radio frequency amplification circuit, a first transformer, a second transformer and a coupler, the first radio frequency amplification circuit is used for outputting a first radio frequency signal, and the second radio frequency amplification circuit is used for outputting a second radio frequency signal; the first transformer comprises a first coil and a second coil, and the second transformer comprises a third coil and a fourth coil; the first coil is connected with the first radio frequency amplification circuit, and the second coil is coupled with the first coil to output a first coupling signal corresponding to the first radio frequency signal; the third coil is connected with the second radio frequency amplification circuit, and the fourth coil is coupled with the third coil to output a second coupling signal corresponding to the second radio frequency signal; the coupler is used for performing power synthesis on the first coupling signal and the second coupling signal to output a synthesized signal. The radio frequency power amplifier and the radio frequency front-end module have better bandwidth performance.

According to an embodiment, An integrated circuit comprising a first cascode radio frequency (RF) power amplifier that includes a first common source transistor having a gate configured to receive a first RF signal, and a source connected to a neutral point; a first common gate transistor having a gate and a drain connected to a power source node, and a source connected to a drain of the first common source transistor; and a first resistor coupled between a bulk of the first common gate transistor and a first bulk bias node configured to provide a voltage that is greater than or equal to a voltage at the source of the first common gate transistor, wherein the first resistor is configured to obtain a floating point.

The invention discloses a radio frequency power amplifier, a radio frequency power amplifier module and a radio frequency power amplifier module, and the radio frequency power amplifier comprises a four-stage power amplifier structure which is used for amplifying an input signal to preset output power; the inter-stage matching network is used for completing impedance matching between the output impedance of each stage of array and the output impedance of the rear-stage array and impedance matching between the input impedance of each stage of array and the output impedance of the front-stage array through an impedance matching technology; the protection circuit comprises a temperature protection unit and a standing-wave ratio protection unit. The temperature protection unit is used for monitoring the temperature of the GaN power amplifier unit in each array in real time and comparing the temperature with a preset temperature, and generating a logic instruction for cutting off the power supply of the corresponding array when the number of overtemperature units is judged to be greater than a preset number; the standing-wave ratio protection unit is used for detecting the output standing-wave ratio and generating a logic instruction for switching power supply when it is judged that the detected standing-wave ratio is larger than a preset ratio. According to the invention, high-performance communication requirements and simple and effective exception protection can be met.

A method and device for determining a power supply voltage of a radio frequency power amplifier, a medium, and a communication device, the method comprising: determining a current environment, the current environment being selected from an alternative set, the alternative set comprising a first environment and a second environment, the noise of the first environment being less than the noise of the second environment; determining a power supply voltage of the radio frequency power amplifier in a receiving stage at least based on the current environment; wherein the power supply voltage difference in the first environment is smaller than the power supply voltage difference in the second environment, and the power supply voltage difference refers to the difference value of the power supply voltage of the radio frequency power amplifier in the sending stage and the power supply voltage of the radio frequency power amplifier in the receiving stage. Through the scheme provided by the invention, the power consumption of the radio frequency power amplifier can be reduced.

The invention provides a radio frequency power amplification circuit and an adjusting method thereof. The radio frequency power amplification circuit comprises an image transmission module, a first radio frequency switch, a radio frequency power amplification module, a radio frequency low-noise amplifier, a second radio frequency switch and an antenna module, the radio frequency power amplification module comprises a GaN radio frequency power amplifier, the image transmission module is connected with an RFC of the first radio frequency switch, the GaN radio frequency power amplifier is connected between RF1 channels of the first radio frequency switch and the second radio frequency switch, and the radio frequency low noise amplifier is connected between RF2 channels of the first radio frequency switch and the second radio frequency switch. The antenna module is connected with the RFC of the second radio frequency switch; the two radio frequency switches are configured to control a radio frequency signal transmitted by the image transmission module to flow to the GaN radio frequency power amplifier in a radio frequency transmitting state, and the radio frequency signal is transmitted to the antenna module after being amplified; in the radio frequency receiving state, radio frequency signals received by the antenna module are controlled to flow to the radio frequency low-noise amplifier and are sent to the image transmission module after being amplified. According to the invention, ultra-long distance image transmission of the unmanned equipment can be realized.

A hybrid coupler has a first port, a second port, a third port, and a fourth port to which a load is connected. An input signal distributor distributes a first input signal that is a radio frequency signal into a second input signal and a third input signal. The second input signal is inputted to a balanced amplifier. The balanced amplifier outputs two amplified radio frequency signals with a phase difference of 90° from each other from two output ends, one of which is coupled to the first port and another one of which is coupled to the second port. The control amplifier amplifies the third input signal and outputs the amplified third input signal from an output end. The output end of the control amplifier is coupled to the third port without any circuit component affecting impedance matching disposed in between.

The invention provides a multimode radio frequency power amplifier module, a radio frequency chip and a mobile terminal. The module comprises two power amplifiers, four switching circuits and a control circuit, an input GSM low-frequency-band radio-frequency signal and a low-frequency-band radio-frequency signal of other communication systems are input into the low-frequency-band power amplifier through the first input switch circuit, and the output of the low-frequency-band power amplifier is connected with one of the low-frequency-band radio-frequency output ports through the first output switch circuit. An input GSM high-frequency-band radio frequency signal and a medium-frequency-band radio frequency signal of other communication systems are input into the medium-frequency-band power amplifier through a second input switch circuit, and the output of the medium-frequency-band power amplifier is connected with one of the medium-frequency-band radio frequency output ports through a second output switch circuit; and the control circuit provides proper working voltage for the low-frequency-band power amplifier and the middle-frequency-band power amplifier respectively. The integration level of the radio frequency amplifier module is improved, the area is reduced, and the cost of the mobile terminal is reduced.

A radio frequency (RF) power amplifier based on transformer matching is provided. The RF power amplifier includes: a first-stage amplification circuit configured with an input terminal and an output terminal, wherein the output terminal of the first-stage amplification circuit is configured to be connected to one terminal of a main coil of a first transformer; the first transformer configured to include the main coil and a secondary coil, wherein one terminal of the secondary coil is grounded and the other terminal of the secondary coil is connected to a medium-low power mode input terminal of a power switch; the second-stage amplification circuit configured with an input terminal for receiving the amplified RF signal from the first-stage amplification circuit, wherein an output terminal of the second-stage amplification circuit is configured to be connected to a high power mode input terminal of the power switch.

The invention relates to the technical field of wireless communication, and provides a radio frequency power amplifier which comprises a power amplifying circuit, a first biasing circuit, a second biasing circuit and a feedback circuit. The first biasing circuit comprises a first resistor, a first voltage division circuit and a first triode, the first end of the first resistor is used for being connected to an external first power supply, and the second end of the first resistor is connected with the first end of the first voltage division circuit and the base electrode of the first triode; the second biasing circuit comprises a second resistor, a second voltage division circuit and a second triode; the first end of the second resistor is connected with the second end of the first resistor, the second end of the second resistor is connected with the second voltage division circuit and the second triode, and the second triode is connected with the feedback circuit and the power amplification circuit. According to the radio frequency power amplifier, power amplifier gain and linear performance fluctuation caused by temperature change can be reduced, and simplified circuit layout and smaller chip area occupation can be realized.

The utility model provides a linear voltage regulator and a radio frequency power amplifier, and the linear voltage regulator comprises a current source generation circuit, an enhancement circuit and a linear voltage stabilizing circuit. The current source generation circuit is used for generating a fixed current source, the enhancement circuit is used for generating voltage overcharge when the linear voltage stabilizer establishes a transient state, and the linear voltage stabilizing circuit is used for generating stable adjusting voltage. After the linear voltage regulator is applied to the radio frequency power amplifier, the linear voltage regulator can generate voltage overcharge at the starting moment of the radio frequency power amplifier, equivalently, the bias voltage of the radio frequency power amplifier at the starting moment is improved, so that the effect of improving the linearity of the radio frequency power amplifier is achieved; therefore, the requirement of the radio frequency power amplifier for linearity at the starting moment is met.

The invention relates to the technical field of power amplifiers, and discloses a GaN broadband radio frequency power amplifier which is applied to a multi-nuclear magnetic resonance system. The GaN broadband radio frequency power amplifier comprises a balance and nonlinear correction module, a preceding stage radio frequency amplification module, a driving stage radio frequency amplification module, a power divider, a radio frequency power amplifier and a power combiner. According to the invention, through the equalization and nonlinear correction module based on frequency identification, the fluctuation of the broadband gain is reduced, through linear correction, the stability of the gain and the stability of the phase are realized when the input power of the working frequency band is changed, and the frequency band coverage, the output power and the efficiency are improved.

This disclosure provides methods, devices, and systems for wireless communications. The present implementations more specifically relate to reducing the power consumption of radio frequency (RF) power amplifiers without sacrificing power efficiency. In some aspects, an RF transmitter may include a signal generator, a power amplifier, and a duty cycle controller. The signal generator is configured to produce one or more RF signals based on a modulation scheme, and the power amplifier is configured to amplify the one or more RF signals for transmission over a wireless communication channel. In some implementations, the duty cycle controller may adjust a duty cycle of each RF signal based on data to be transmitted according to the modulation scheme. By changing the duty cycle of the RF signal, the duty cycle controller may toggle the output power of the power amplifier and thus modulate the amplitude of the output waveform to carry the data.

The invention discloses a high-power modular radio frequency power amplifier capable of realizing wide-range power regulation. The high-power modular radio frequency power amplifier comprises a radio frequency load RL and m power amplification modules, the m power amplification modules are connected in parallel at a direct current side and are connected with an adjustable direct current bus voltage source; and the m power amplification modules are connected in parallel at the alternating current side and are superposed at the alternating current side. The output current of all the power amplification modules is transmitted to the radio frequency load RL; each power amplification module comprises a high-frequency switch power amplification unit, an LCL resonance network and an isolation transformer. According to the invention, through the configuration of the number of the power amplification modules and the adjustable cooperative control of the DC bus voltage source, the continuous adjustment of the output power is realized, meanwhile, the stable operation of each power amplification module under the resonance condition is ensured, the zero-voltage switching state is maintained, and the overall operation efficiency of the architecture and the adaptability of the radio frequency load are effectively improved.

The invention provides a reconfigurable power amplifier based on dynamic modulation of a gate width adjustable transistor, and belongs to the technical field of radio frequency power amplifiers. The power amplifier is characterized in that a multi-mode grid width adjustable transistor is innovatively introduced to replace a traditional solidified structure parameter transistor to serve as a power amplifier tube; the transistor with the adjustable gate width is divided into a main unit cell and n auxiliary unit cells according to an interpolation index (or gate width), the main unit cell is responsible for determining the output power of the whole transistor, meanwhile, n small-power auxiliary unit cells are integrated to form an active load modulation module, and impedance matching optimization and linearity compensation are achieved by dynamically adjusting the on-off state of the active load modulation module. According to the structure, the linear expansibility of power output is guaranteed, a hardware basis is provided for micro impedance adjustment, cooperative regulation and control of system power efficiency dual modes and even linearity are achieved, and the power amplifier performance in a multi-band wireless communication system is effectively improved.

The invention provides a millimeter wave radio frequency power amplifier and a millimeter wave radio frequency transceiver, in the amplifier, an input differential signal is connected to grid electrodes of an amplification tube pair transistor and an auxiliary tube pair transistor through an auxiliary tube pair transistor blocking capacitor and an amplification tube pair transistor blocking capacitor; source electrodes of the auxiliary tube pair tube and the amplifier tube pair tube are grounded. The first amplifier tube is connected with the drain electrode of the first common-gate tube and the source electrode of the first auxiliary tube; the second amplifier tube is connected with the drain electrode of the second common-gate tube and the source electrode of the second auxiliary tube; grid electrodes of the common-gate pair transistors are connected; common-gate tube grid bias voltage is connected to grids of the common-gate tube geminate transistors through the bias resistor, and the other end of the grounding capacitor is connected to the grids of the common-gate tube geminate transistors; the drain electrode of the common-gate pair transistor is connected to the shunt capacitor and the main coil inductor of the output balun, and the secondary coil inductor of the output balun is connected with a single-ended output signal. According to the radio frequency power amplifier, OP1dB of the radio frequency power amplifier can be improved under the condition that the working voltage of the power amplifier is not increased.

The invention provides a radio frequency power amplifier behavior model simulation method based on machine learning, which adopts a double-model structure of a main model and an error model, is based on a convolutional neural network modeling mode driven by actual test data, and directly learns behavior characteristics from input and output responses of a device. And the method does not depend on a physical structure or an analytical model in the device, so that the modeling complexity is remarkably reduced, and the efficiency is improved. In order to further improve the generalization ability and robustness of a machine learning model, an incremental training mechanism is introduced, and in each round of iteration, according to the error performance of the model on incremental training set samples, high-credibility samples are screened from the samples to be brought into the next round of training; through the gradual learning strategy from easy to difficult, the over-fitting risk is effectively reduced, and the prediction capability of the model for unknown samples is improved.

The invention provides a Bluetooth-based head-mounted team communication device and system, and the device comprises a head-mounted equipment body which comprises a glasses frame worn on the head and glasses legs located at the two sides of the head; and the Bluetooth chip is arranged in the glasses leg and is used for realizing a Bluetooth wireless communication function. According to the Bluetooth-based head-mounted team communication device provided by the invention, through the configuration of the Bluetooth antenna, the radio frequency power amplifier and the radio frequency power amplifier antenna, communication signals of the Bluetooth and the Bluetooth Mesh are effectively enhanced, and the communication signals of the Bluetooth and the Bluetooth Mesh are effectively enhanced in different environments, no matter in a place with relatively strong signal interference or in a condition with a relatively long distance. The voice communication system can stably transmit data, reduces signal interruption and delay, ensures clear and stable voice communication quality, and provides smooth communication experience for users.

A radio frequency power amplifier includes a power amplification transistor and a gate bias circuit. The gate bias circuit includes a VHb terminal connected to a high voltage power supply for bias, a VLb terminal connected to a low voltage power supply for bias, an enable terminal that receives an enable signal, an enable transistor and a voltage dividing resistor that are connected in series and connected between the VHb terminal and the VLb terminal, a driver that outputs a voltage to a control terminal of the enable transistor, and a gate bias output terminal that outputs, as a gate bias voltage, a divided voltage generated by the voltage dividing resistor. When an OFF signal is received as the enable signal, the driver causes the enable transistor to operate in a first operating area that is not a cutoff region.

The invention provides a radio frequency output control circuit, method and device and a readable storage medium, and the radio frequency output control circuit is used for outputting a control signal to a radio frequency power amplifier circuit so as to control the radio frequency power amplifier circuit to output corresponding radio frequency electric energy. The radio frequency output control circuit comprises a voltage monitoring unit and a control adjusting unit. The voltage monitoring unit is used for acquiring a first voltage value. And at least when the initial control signal is switched from the low level to the high level, the adjusting unit is controlled to be in a trigger state. Wherein the control adjusting unit is used for modulating the level of an initial control signal into a low level for outputting or keeping the level of the initial control signal for outputting according to the relationship between a first voltage value and a preset voltage value when the control adjusting unit is in a triggering state; and in the non-triggering state, keeping the level of the initial control signal and outputting the initial control signal to obtain a target control signal. The radio frequency power amplifier circuit can reduce energy loss when the radio frequency power amplifier circuit outputs radio frequency electric energy.