129results about "Amplifier modifications to reduce non-linear distortion" patented technology

The application provides a power amplification circuit, a radio frequency circuit, a radio frequency chip and an electronic device. The power amplification circuit comprises a power amplification unit, a signal conversion unit and a resonance unit. The power amplification unit has an input end and an output end, can perform power amplification processing on an input signal input from the input end to form a corresponding amplified signal, and outputs the amplified signal through the output end. The input signal is a differential signal comprising a first frequency band local oscillator signal, and the amplified signal is a differential signal comprising a second frequency band interference signal and the first frequency band local oscillator signal. The signal conversion unit is connected with the output end of the power amplification unit, and the signal conversion unit is used for converting the amplified signal from the differential signal into a single-ended signal. The resonance unit is connected with the signal conversion unit and is connected between the signal conversion unit and the output end of the power amplification circuit.

A distributed power management apparatus is provided. The distributed power management apparatus includes an envelope tracking (ET) integrated circuit (ETIC) and a distributed ETIC separated from the ETIC. The ETIC is configured to generate a number of ET voltages for a number of power amplifier circuits and the distributed ETIC is configured to generate a distributed ET voltage(s) for a distributed power amplifier circuit(s). In a non-limiting example, the number of power amplifier circuits and the distributed power amplifier circuit(s) can be disposed on opposite sides (e.g., top and bottom) of a wireless device. As such, in embodiments disclosed herein, the ETIC is provided closer to the power amplifier circuits and the distributed ETIC is provided closer to the distributed power amplifier circuit(s). By providing the ETIC and the distributed ETIC closer to the respective power amplifier circuits, it is possible to reduce trace inductance and unwanted signal distortion.

This invention provides an amplifier with improved bias tracking performance based on a DSP chip. It includes a file acquisition module that directly acquires the audio file to be played via an interface. The audio file is pre-input into the DSP for standard waveform analysis, which speeds up processing and reduces latency during actual playback. During actual playback, the actual played energy is compared with the pre-calculated energy to determine if it matches the pre-designed output. If it matches, the pre-designed output is used directly; otherwise, it is further input into a model for processing, ensuring operational stability and safety.

This invention belongs to the field of integrated circuit technology and discloses a dual-transformer load-gain-flat tunable low-noise amplifier, including an input matching circuit, a two-stage common-source current-multiplexed amplifier circuit, and an output matching circuit. It also includes a first transformer topology circuit, a second transformer topology circuit, a first adjustable bias voltage source, and a second adjustable bias voltage source. The two-stage common-source current-multiplexed amplifier circuit includes a first-stage common-source amplifier circuit and a second-stage common-source amplifier circuit. The first transformer topology circuit serves as the load for the first-stage common-source amplifier circuit; the second transformer topology circuit serves as the load for the second-stage common-source amplifier circuit. The low-noise amplifier of this invention features high gain, high linearity, and high gain flatness, while achieving a wide tuning range of gain adjustment. Furthermore, it achieves good gain flatness and good input-output matching at different gain adjustment levels.

The application discloses a power amplifier dynamic predistortion optimization processing method and system based on fusion reinforcement learning, relates to the technical field of radio frequency power amplifier signal processing, and comprises the following steps: collecting feedback signals and environmental change signs during power amplifier operation, unifying time scales and frequency band scales, generating a comprehensive reference draft of the feedback signals and the environmental change signs, and establishing a common reference for subsequent comparison. The application distinguishes interference behaviors from power amplifier operation states by constructing a comprehensive reference draft with unified scales and extracting interference rhythms and interference fingerprints, and avoids false updates of reinforcement learning during interference. By setting a freezing point, inserting a silent sampling window and a reverse reward mask, the application ensures that predistortion adjustment bypasses interference, so that parameter updating is more reliable and the linearization state of the power amplifier remains stable.

The application discloses a terminal cooperative digital pre-distortion strategy system and belongs to the technical field of wireless communication. The digital pre-distortion module and the terminal module work cooperatively, a specific sequence is inserted at a fixed position, more effective data is provided for the pre-distortion module, the pre-distortion module modeling is more accurate, and a more suitable strategy decision is made for a fast changing scene. The system comprises a state monitoring module, a digital pre-distortion module, a parameter evaluation module, a terminal module and a front end module, the working state of the system is detected, the pre-distortion module is started according to requirements, the characteristics of forward and feedback signals are analyzed, whether the signals are suitable for pre-distortion modeling is judged, and the look-up table data is detected to guarantee the accuracy of the pre-distortion coefficient. The application can realize the interaction and cooperative work of the terminal module and the digital pre-distortion module, is more favorable to the establishment of a digital pre-distortion model, and has a better pre-distortion effect.

The present disclosure provides a sequential power amplifier that achieves phase distortion compensation using sequential operation. [Solution] The sequential power amplifier according to this disclosure comprises a main amplifier that performs signal amplification at a constant load regardless of the input level, and an auxiliary amplifier that performs signal amplification at high power output when the input level is above a predetermined level, and whose phase distortion characteristics are different from those of the main amplifier. The phase distortion characteristics of the main amplifier are inverse to those of the auxiliary amplifier.

A digital pre-distortion circuit and technique for a signal being amplified. Digital pre-distortion is performed using a model-based pre-distortion function. Pre-distortion is further corrected using a data-driven pre-distortion function. The model-based pre-distortion function and the data-driven pre-distortion function are trained using training data including a digital loopback signal generated by sampling a loopback signal of an amplifier, the digital pre-distorted signal input to the amplifier for a time period, and an intermediate signal output from the model-based pre-distortion function driven by the digital loopback signal or an output of the data-driven pre-distortion function. Parameters may be continually updated in order to account for changes in characteristics of the amplifier.

The present application relates to the technical field of wireless communications. Disclosed are a digital pre-distortion processing method and apparatus, and a terminal device and a computer storage medium. The digital pre-distortion processing method comprises: receiving original input data of a radio-frequency power amplifier; pre-processing the original input data to obtain compressed data; and performing nonlinear processing on the compressed data, so as to obtain output data as actual input data of the radio-frequency power amplifier.

The present disclosure relates to a communication apparatus and method for efficiently carrying out digital pre-distortion (DPD) on a transmission signal of a wireless communication system according to various operating conditions. The communication apparatus that carries out DPD on a transmission signal of a wireless communication system, according to an embodiment of the present disclosure, may comprise a power amplifier that amplifies the transmission signal. The communication apparatus may comprise a DPD apparatus that is connected to an input terminal of the power amplifier and carries out, on the basis of operating condition data of the communication apparatus, a DPD operation by using fake data generated for the transmission signal. The DPD apparatus may include a generator based on a conditional GAN. The generator may be configured to receive, as inputs, the operating condition data and input / output signals collected from the power amplifier and generate, on the basis of data acquired through repeated training of the conditional GAN using the collected input / output signals and the operating condition data, the fake data learned to compensate for nonlinear distortion at the output of the power amplifier.

The present application relates to a digital pre-distortion processing circuit and a signal processing device, the digital pre-distortion processing circuit comprising a narrow-band spread spectrum module, a digital pre-distortion module and a filtering module. The narrow-band spread spectrum module is used to spread the input narrow-band radio frequency signal into a wide-band radio frequency signal. The bandwidth of the wide-band radio frequency signal is a preset bandwidth. The digital pre-distortion module is used to perform digital pre-distortion linearization processing on the wide-band radio frequency signal to obtain a linearized wide-band radio frequency signal; the preset bandwidth is located within the optimal cancellation bandwidth of the digital pre-distortion module. The filtering module is used to perform signal filtering on the linearized wide-band radio frequency signal to obtain a linearized narrow-band radio frequency signal. The digital pre-distortion linearization processing on the narrow-band radio frequency signal is realized, and the cancellation capability of the digital pre-distortion system for the narrow-band radio frequency signal is greatly improved.

Various embodiments of the present disclosure relate to transmitter systems, methods, and instructions for signal predistortion. The transmitter system includes an intermodulation distortion (IMD) filter module configured to filter a detected feedback signal (Yin) to generate a targeted filtered signal (Yout), a digital pre-distortion (DPD) coefficient estimation module configured to update signal generation coefficients based on comparing an input signal (Sin) with the targeted filtered signal (Yout), and a distortion compensation processing module configured to generate a pre-distorted signal (Uout) based on the input signal (Sin) using the updated signal generation coefficients.

This invention relates to a chopper amplifier, comprising a clock generator module, an input chopper module, an amplifier module, and an output chopper module. The clock generator module includes a zero-crossover aligned clock circuit, which outputs an intermediate clock based on the differential input signal and detects the zero-crossover point, aligning the edge of the intermediate clock to the zero-crossover point to generate an aligned chopper clock. The output chopper module is connected to a self-filling circuit, which, in conjunction with the chopper clock, samples the differential output voltage during the chopper steady-state phase and, during the chopper transition phase, forms a short circuit between the differential output nodes, causing the current polarity of the amplifier module to internally reverse, while simultaneously performing self-filling. By utilizing zero-crossover aligned chopper technology and / or self-filling technology, intermodulation distortion caused by chopping is suppressed or eliminated mechanistically without increasing power consumption or noise, significantly improving the linearity and usable input frequency range of the chopper amplifier.

The present disclosure relates to the technical field of integrated circuits, and particularly relates to an operational amplifier, a driving chip and an electronic device. The operational amplifier comprises: an operational amplification circuit comprising at least one input transistor group, each input transistor group comprising a first differential input transistor and a second differential input transistor; at least one resistance unit; and at least one voltage follower module, an input end of each voltage follower module being configured to receive a common-mode voltage of a differential signal to be amplified, and an output end of each voltage follower module being connected to a second end of a corresponding resistance unit. According to the present disclosure, the source common node voltage of each input transistor group is followed to change with the common-mode voltage through the resistance unit and the voltage follower module, and on the basis of retaining high linearity and high energy efficiency, the common-mode rejection and the power supply rejection are greatly improved, thereby improving the performance and energy efficiency of the operational amplifier.

This disclosure relates to an adaptive cascode gate bias generation circuit. The circuit includes a first resistor, a second resistor, a current source, and a transistor. The first resistor is located between a voltage rail and a drive interconnect. The drive interconnect and the voltage rail are electrically connected to the first resistor. The second resistor is located between the drive interconnect and ground. Ground and the drive interconnect are electrically connected to the second resistor. The current source is located between the voltage rail and the drive interconnect. The drive interconnect and the voltage rail are electrically connected to the current source. The transistor is located between the drive interconnect and a snubber interconnect. The drive interconnect and the snubber interconnect are electrically connected to the transistor.

A bias compensation circuit that receives a detection signal from a detection circuit is provided. The detection circuit is configured to detect a radio frequency signal in an amplifier circuit. The bias compensation circuit includes a conversion circuit and a bias circuit. The conversion circuit is coupled to the detection circuit, and is used to adjust a phase or an amplitude of the detection signal to generate an injection signal, wherein the injection signal is a current signal. The bias circuit is coupled to the conversion circuit, and is used to generate a bias signal to the amplifier circuit based on the injection signal, wherein the bias signal varies with the detection signal.

The disclosure relates to a 5th generation (5G) communication system or a 6th generation (6G) communication system for supporting higher data rates beyond a 4th generation (4G) communication system, such as long term evolution (LTE). A method performed by a receiving node in a wireless communication system is provided. The method includes receiving first signals from a transmitting node, identifying compensation values in which distortion of the first signals is compensated on a time domain by using an artificial neural network trained by a designated scheme, and obtaining second signals of which the distortion is compensated based on the identified compensation values. The designated scheme may be determined by a size of a first resource block (RB) assigned to receive the first signals from the transmitting node.

A semiconductor die includes a transistor including a source region, a drain region, a channel between the source region and the drain region, and a gate structure overlying the channel. The gate structure is configured to control a conductivity of the channel vis an electrical voltage applied thereto. The semiconductor die includes a first gate terminal electrically connected to the gate structure and a first harmonic filter inductor formed in a body of the semiconductor die. The first harmonic filter inductor is electrically connected to the first gate terminal. The semiconductor die includes a first harmonic filter capacitor formed in the body of the semiconductor die. The first harmonic filter capacitor includes a first capacitor plate electrically connected to the first harmonic filter inductor and a second capacitor plate connected to a ground reference node.

The application relates to the field of wireless communication technology and provides a radio frequency low-noise amplifier which comprises an input matching module, a power amplification module and an output matching module which are electrically connected in sequence, and an RC attenuation module and an RC feedback module; the first end of a first inductor is used as the input end of the output matching module; the first end of the first inductor is connected with the output end of the power amplification module, the control end of a switch and the first end of a first adjustable resistor respectively; the second end of the first inductor is connected with the first end of a second inductor and the first end of a third capacitor respectively; the output end of the switch is connected with the first end of a first capacitor and the first end of a second capacitor respectively; the second end of the second capacitor is connected with the second end of the first adjustable resistor and the second end of the second inductor and is used for connecting a power supply; the second end of the first capacitor is connected with the second end of the third capacitor and is used as the output end of the output matching circuit. The radio frequency low-noise amplifier has adjustable gain, low noise and good linearity.

The bias compensation circuit includes a power detection circuit and a bias circuit. The power detection circuit includes first and second power distribution circuits, first and second detection circuits, first and second conversion circuits, and a combination circuit. The first and second power distribution circuits generate first and second power distribution signals, respectively, in accordance with an input signal. The first and second detection circuits generate first and second detection signals, respectively, in accordance with the first and second power distribution signals. The power ranges of the first and second power distribution signals are different. The first and second conversion circuits convert the first and second detection signals to first and second power currents, respectively. The combination circuit receives the first and second power currents to generate a detection signal. The bias circuit receives the detection signal to adjust a bias signal and provide the bias signal to an amplifier circuit.

To provide a Doherty amplification device capable of shortening an adjustment time.SOLUTION: A Doherty amplification device comprises: a distribution section for distributing a distortion compensated input signal from a distortion compensation section into a first signal and a second signal; a first amplification section for amplifying the first signal; and a second amplification section for amplifying the second signal. The Doherty amplification device comprises: a composition section for composing the first signal from the first amplification section with the second signal from the second amplification section; and an adjustment section which is disposed between the distribution section and the first amplification section or the second amplification section and adjusts a phase delay value of the first signal or the second signal from the distribution section. On the basis of an output signal outputted from the composition section and an input signal inputted to the distortion compensation section, the adjustment section calculates a characteristic indicating a relation of a gain of the output signal with respect to reference power of the input signal. The adjustment section classifies the calculated characteristic into a plurality of regions in accordance with a level of the reference power and calculates a total value of gains on a region basis and on the basis of the total value on the region basis, a phase delay value with best radio characteristics is set to the adjustment section.SELECTED DRAWING: Figure 2

This application relates to methods and apparatus for power limiting for amplifiers. An amplifier is configured to receive an input supply voltage and to draw, in use, an amplifier input current resulting in an amplifier input power. A power limiter is configured to monitor an indication of the amplifier input power, determine a first signal limit based on said indication of the amplifier input power and a pre-set limit and apply regulation to the input signal to provide a regulated input signal for input to the amplifier that does not exceed the first signal limit.

The application relates to the technical field of power amplifiers, in particular to a compact high-linearity power amplifier module for a small base station, which comprises a shell, a partition plate fixedly arranged in the shell, a main power amplifier module fixedly arranged on the partition plate, and a vice power amplifier module fixedly arranged in the shell; a thin tube one and a thin tube two are fixedly arranged in the shell, and the thin tube one and the thin tube two are fixed on the shell and the partition plate respectively; the thin tube one and the thin tube two are adjacent to the top surface of the main power amplifier module and the top surface of the vice power amplifier module respectively; an installation pipe is arranged in the shell, and the two ends of the installation pipe are fixedly connected with the thin tube one and the thin tube two respectively; a wiring post one is fixedly arranged on the main power amplifier module and the vice power amplifier module. The long-term reliability of the equipment is improved and the service life is prolonged through the automatic switching assembly.

The application relates to a radio frequency power amplifier linearity improvement method, satisfies the requirement of a high-order modulation communication system on the linearity of a memory type power amplifier, effectively solves the problem of signal distortion caused by the nonlinearity of a radio frequency power amplifier, first, a modeling method is designed to effectively reflect the memory effect of the power amplifier and accurately describe the input-output relationship of the power amplifier, thereby providing support for subsequent predistortion design; then, a predistortion scheme is applied to adjust the input signal on the basis of the accurate model, and the predistortion scheme has the advantages of simple structure, fast calculation speed and relatively easy realization process; in addition, considering the aging and other problems in the actual use process of the device, a real-time updating measure for the predistortion adjustment scheme is designed, the adaptability of the whole system is increased, and the shortcoming that the memory type power amplifier model is only a mathematical model and cannot describe the changes in actual application is made up.

The present disclosure relates to a system (108) and a method (700) for improving linearity of a power amplifier (PA) (312). The system (108) includes a processing engine (210) connected to an inverse coefficient estimation (ICE) module (212). The ICE module (212) is designed to capture one or more output data samples of the power amplifier (PA) (312), process the one or more output data samples to generate an error signal indicating power amplifier non-linearity, and estimate one or more parameters of a pre-distorter using a periodic prognostic error convergence (PPEC) technique based on the error signal. The estimation of pre-distorter one or more parameters involves estimating inverse coefficients using a time-varying forgetting factor λ. The ICE module (212) generates a pre-distorted input signal using the estimated one or more parameters and applies the pre-distorted input signal to the PA (312) for improving linearity of the power amplifier (PA) (312).

A magnetic audio distortion device is provided which produces consistent levels of magnetic flux, non-linear hysteresis, or saturation across the audio spectrum using soft magnetic materials in electromagnetic components such as, for example, transformers or inductors. The device comprises an audio signal connected to an amplified electromagnetic network comprising an electromagnetic component capable of creating non-linear hysteresis and a series resistance. The output of the amplified electromagnetic network is approximately the derivative of the magnetic flux in the electromagnetic component. The output of the network is integrated, producing the magnetic flux in the magnetic core. The output of the system is magnetically distorted consistently across all audio frequencies. The magnetic audio distortion device provides the sonic characteristic of magnetic audio tape without requiring mechanical apparatus or hard magnetic materials enabling the sonic characteristics of magnetic tape in a compact and reliable form.