204 results about "Broadband power amplifier" patented technology

A remote radio head unit (RRU) system for multiple operating frequency bands, multi-channels, driven by a single or more wide band power amplifiers. More specifically, the present invention enables multiple-bands RRU to use fewer power amplifers in order to reduce size and cost of the multi-band RRU. The present invention is based on the method of using duplexers and / or interference cancellation system technique to increase the isolation between the transmitter signal and receiver signal of the RRU.

A method and apparatus compensate for a non-linear characteristic of a wideband power amplifier in a transmitter for a communication system, which has the wideband power amplifier for amplifying a digital input signal. The method involves the steps of (a) generating an address based on the digital input signal, reading a distortion control value corresponding to the address from a look-up table, and applying the read distortion control value to the digital input signal to predistort the digital input signal; (b) frequency up-converting the predistorted signal and amplifying the frequency up-converted signal; (c) frequency down-converting the amplified signal and compensating for a delay of the frequency down-converted signal; and (d) updating a predetermined distortion control value in the look-up table to compensate for an error value generated in the power amplifier and an analog path occurring in steps (b) and (c) based on the compensated signal.

A high performance and cost effective method of RF-digital hybrid mode power amplifier systems with high linearity and high efficiency for multi-frequency band wideband communication system applications is disclosed. The present disclosure enables a power amplifier system to be field reconfigurable and support multiple operating frequency bands on the same PA system over a very wide bandwidth. In addition, the present invention supports multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels.

The invention provides an adaptive digital pre-distortion technique and device which is suitable for OFDM projector. The device comprises an OFDM baseband signal module for orthogonal frequency division multiplexing technique, a digital pre-distortion synthetic process component, an analog and digital converter DAC, a radio frequency projector, a wideband high power amplifier, i.e., W-HPA, and a feedback circuit. Wherein, a digital pre-distortion internal core, which is structured in polynomial mode, implements pre-distortion process to the digital signals which have undergone signal pre-process; the estimate and uploading to an adaptive digital pre-distortion filter is implemented, based on hybrid algorithm which is the combination of training-sequence-based RLS+LMS algorithm or hybrid algorithm which is the combination of training-sequence-based QRD-RLS+NLMS algorithm. The invention can efficiently reduce the performance degradation of a wideband power amplifier caused by memory effect, improve the projecting performance of a base station system, and improve the linearity and the efficiency of the wideband power amplifier.

A digital predistortion apparatus is provided for predistorting a nonlinear characteristic caused by a wideband power amplifier that amplifies a input signal. The digital predistortion apparatus includes a predistorter, connected to the power amplifier via a digital-to-analog converter (DAC) and a frequency up-converter, for receiving the input signal and compensating for the nonlinear characteristic using a look-up table that depends upon a change in output power of the power amplifier. The digital predistortion apparatus further includes look-up table (LUT) updating block for adaptively updating the look-up table by comparing a feedback signal output from the power amplifier, connected thereto via an analog-to-digital converter (ADC), with the input signal output from the predistorter.

A high performance and cost effective method of RF-digital hybrid mode power amplifier systems with high linearity and high efficiency for multi-frequency band wideband communication system applications is disclosed. The present disclosure enables a power amplifier system to be field reconfigurable and support multiple operating frequency bands on the same PA system over a very wide bandwidth. In addition, the present invention supports multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels.

A Multi-Mode Multi-Band (MMMB) radio frequency (RF) power amplifier circuit operating at multiple frequency bands. The power amplifier circuit comprises a single wideband power amplifier having high output impedance which is configured to be equal to a load impedance of the load connected to the power amplifier circuit. A bias voltage applied to the wideband power amplifier is changed from a first value to a second value to provide a predetermined output power of the wideband power amplifier to the load with the output impedance of wideband power amplifier being equal to the load impedance. The power amplifier circuit also includes an individual harmonic filter for filtering each frequency band independently.

An apparatus and method for eliminating the spurious signal of a non-linear amplifier in a base station transmitter of a mobile communication system are provided. A digital predistorter includes first and second predistorters, each having a memoryless non-linearity part using a look-up table and a memory non-linearity part using an finite impulse response (FIR) filter. The first predistorter adaptively updates the look-up tables, while the second predistorter adaptively updates the filtering coefficients of the FIR filters. According to another embodiment of the present invention, a digital predistorter has a memoryless non-linearity part using a look-up table and a memory non-linearity part using an FIR filter, and adaptively updates the look-up table and the filtering coefficients of the FIR filter.

A transmitter for a plurality of carriers of a broad-band transmitting spectrum which contains a broad-band power amplifier encompassing the carriers for amplifying an input signal into a more powerful output signal, wherein a measuring signal is formed from the output signal with the aid of a decoupler. The transmitter further contains an adaptation unit for comparing the input signals to the measuring signals and for thereafter forming a correction signal. A predistortion of the input signal is performed in a predistortion unit in the transmitter corresponding to the setpoint selections of the correction signal.

According to the present invention, a digital pre-distortion device and method for use in a dynamic spectrum allocation system, which uses a breadband frequency range, such as a cognitive radio (CR) system, are implemented. Also, while as conventional pre-distortion device only enable the linearization of a signal of a fundamental frequency band, the digital pre-distortion device and method according to the present invention enable not only the linearization of a basic signal on frequency fc, but also simultaneously enable the elimination of harmonic signals on the high frequencies of 2fc, 3fc, 4fc, etc. The digital pre-distortion device for a broadband power amplifier according to a preferred embodiment of the present invention comprises: a nonlinear power amplifier; an equivalent amplifier model estimator; N pre-distorters; and a coefficient extractor for extracting the coefficients of the N pre-distorters.

A remote radio head unit (RRU) system for multiple operating frequency bands, multi-channels, driven by a single or more wide band power amplifiers. More specifically, the present invention enables multiple-bands RRU to use fewer power amplifiers in order to reduce size and cost of the multi-band RRU. The present invention is based on the method of using duplexers and / or interference cancellation system technique to increase the isolation between the transmitter signal and receiver signal of the RRU.

The invention discloses a 0.1-5GHz ultra-wideband CMOS (complementary metal oxide semiconductor) power amplifier which comprises an input matching circuit, an ultra-wideband driving-stage amplifying circuit, an ultra-wideband power amplifying circuit and an output direct-current blocking circuit. A first ultra-wideband driving stage is used for acquiring preceding-stage gain and guaranteeing ultra-wideband input matching of the integral circuits; an ultra-wideband driving power stage is used for guaranteeing high power output of the integral circuits and an excellent ultra-wide output matching characteristic of the integral circuits. The 0.1-5GHz ultra-wideband CMOS power amplifier has the advantages that a double-stage stacking structure is combined with a compensation capacitive circuit, so that a chip is small in area and wide in bandwidth; parameters of the amplifier can be determined after various indexes such as the gain, bandwidths and output power of the integral circuits are integrated in the integral circuits, so that requirements on high gain, linearity and driving power and flatness at the bandwidth of 0.1-1.5GHz can be met.

A digital predistortion apparatus is provided for predistorting a nonlinear characteristic caused by a wideband power amplifier that amplifies a input signal. The digital predistortion apparatus includes a predistorter, connected to the power amplifier via a digital-to-analog converter (DAC) and a frequency up-converter, for receiving the input signal and compensating for the nonlinear characteristic using a look-up table that depends upon a change in output power of the power amplifier. The digital predistortion apparatus further includes look-up table (LUT) updating block for adaptively updating the look-up table by comparing a feedback signal output from the power amplifier, connected thereto via an analog-to-digital converter (ADC), with the input signal output from the predistorter.

The invention discloses a method for applying a combined algorithm to a combined learning structure digital predistortion system. Through combination of a classic crest factor restriction (CFR) technology and a digital predistoriton (DPD) technology, a combined learning structure design digital predistoriton system combining an indirect learning structure and a direct learning structure is provided according to advantages and disadvantages of the direction learning structure and the indirect learning structure; then according to advantages of an LMS algorithm, an RLS algorithm and a variable step size LMS, namely, NLMS algorithm, a combined algorithm combining RLS and NLMS is provided for estimating and updating parameters of a digital predistorter. The combined algorithm has the characteristic of rapid convergence of the RLS algorithm and also simplifies computation amount. CFR and DPD are sequentially performed on an input peak average ratio signal, then the processed signal is sent to a power amplifier, so that ideal linear output is obtained, and in-band distortion and out-band spectrum expansion caused by power amplifier non-linear are effectively relieved. Through adoption of the method, performance degradation of a broadband power amplifier caused by memory effect is relieved, furthermore, the linearity and efficiency of the broadband power amplifier are improved.

The invention belongs to the field of radio frequency microwave integrated circuit design, in particular to a broadband high-gain-flatness power amplifier. The power amplifier mainly includes: an input matching network composed of a high coupling factor transformer and a capacitor resistor; a differential common-source driver amplifier with neutralization capacitance; an inter-stage matching network composed of high coupling factor transformers; a differential common-source power amplifier with neutralizing capacitance for power amplification; and an output matching network which is composed of a high-coupling-factor transformer and a load capacitor. The power amplifier adopts high-coupling-factor transformers in three-stage matching network. The in-band gain fluctuation of broadband is reduced by compensating three-stage matched gain fluctuation, which effectively solves the problem of poor gain flatness caused by large inter-stage matched gain fluctuation of traditional broadband power amplifiers and improves the gain at the same time. Compared with the prior art, the invention can significantly improve the gain flatness of the wideband power amplifier while realizing high gain.

Systems and methods related to linear and efficient broadband power amplifiers. A power amplifier (PA) system can include an input circuit configured to receive a radio-frequency (RF) signal and split the RF signal into a first portion and a second portion. The PA system can further include a Doherty amplifier circuit including a carrier amplification path coupled to the input circuit to receive the first portion and a peaking amplification path coupled to the input circuit to receive the second portion. The PA system can further include an output circuit coupled to the Doherty amplifier circuit. The output circuit can include a balance to unbalance (BALUN) circuit configured to combine outputs of the carrier amplification path and the peaking amplification path to yield an amplified RF signal.

A wideband harmonic trap includes a first resonant tank in the form of a parallel LC circuit, and a second resonant tank in the form of a series LC circuit. The LC circuits are connected to it common input, an output of the parallel LC circuit is connected to a load and to ground via a shunt capacitor, and an output of the series LC circuit is connected to the ground.

The invention discloses a multifrequency microwave detecting system for moisture content. The multifrequency microwave detecting system comprises a microprocessor circuit, a wide-band power amplifier, a wide-band high-frequency power divider, an amplitude and phase discriminating device, a signal amplifier, a communication circuit and a voltage-controlled oscillator, wherein the microprocessor circuit outputs a voltage control signal; the voltage-controlled oscillator is controlled to output a variable frequency signal with the frequency of 300MHz to 2.4GHz; after the variable frequency signal passes through the wide-band power amplifier and the wide-band high-frequency power divider, one path is outputted to an antenna, and the other path is outputted to the wide-band amplitude and phase discriminating device; a signal returned from the antenna is also transmitted to the wide-band amplitude and phase discriminating device for comparing; after a signal outputted by the amplitude and phase discriminating device is transmitted to the microprocessor circuit for sampling and processing, obtained data are transmitted to a communication circuit; due to the adoption of the multifrequency microwave detecting system for the moisture content, interval time can be set from 1ms to 1s; the attenuation of mineralization degree to a high-frequency signal is lower than that of the mineralization degree to a low-frequency signal, so that the influence of the mineralization degree is eliminated by measuring different frequencies.

The invention discloses a broadband highly efficient continuous inverse class-F power amplifier and a design method of the continuous inverse class-F power amplifier. The power amplifier comprises five high-low impedance transmission line type input matching circuits, six high-low impedance transmission line type output matching circuits, an adjustable input feed network and a broadband output feed network. Based on the improved simple real frequency technique matching algorithm with harmonic control, the input and output impedance of the power amplifier is subjected to broadband matching, and the high-efficiency working of the broadband highly efficient continuous inverse class-F power amplifier is realized. The design method improves the efficiency, while the defect that the dielectric constant of a baseplate material in the general low-pass filter prototype design method is limited is avoided, and the continuous inverse class-F power amplifier which can be applied to plates with the higher dielectric constant is provided. Under the application background of high-efficiency broadband power amplifiers and aiming at the comprehensive demands of the broadband high-efficiency design method, the broadband highly efficient continuous inverse class-F power amplifier has the advantages of being simple in structure, compact in size and wide in applicability.

An RF linearizer and an associated method are provided for linearizing a power amplifier. The RF linearizer may include: (a) a quadrature up-converter for up-converting a baseband input signal that is to be transmitted by the power amplifier; (b) an RF analog predistorter controlled by a set of coefficients for predistorting the up-converted input signal; (c) a down-converter for down-converting an output signal of the power amplifier; (d) an error monitor receiving the down-converted output signal and the input signal for providing an error signal; and (e) a signal analyzer receiving the error signal, the signal analyzer using an out-of-band power spectrum of the error signal to optimize the set of coefficients. The input signal may have an in-phase component and a quadrature component.

The invention discloses a micro speaker with directional transaudient function, belonging to the speaker field, which comprises a plurality of transducer units in the form of array. The speaker comprises the following working steps: audio signal is amplified by a broadband power amplifier and input into a micro transducer, and the transducer generates audible sound which has the same working principle as the traditional audio tweeter; the audio signal is loaded into ultrasonic signal generated by a digital signal processing system; the modulated signal is amplified by the broadband power amplifier and input into the micro transducer; the transducer transmits the signal in air; due to air nonlinear interaction, the signal generates audible sound with high directivity by self-modulating. The speaker is applicable to the occasion with traditional audio function separately or directional transaudient function or both.

The invention discloses a counter system for all-weather automatic detection and interference of unmanned aerial vehicles, comprising a main control computer, a pan-tilt for installing various components, a signal processing module, a control module, a broadband power amplifier, an antenna array and an interference transmission The antenna, the PTZ includes a base, an upper tray, a fork arm and an antenna placement shaft. The interior of the base is equipped with a vertical stepping motor, a radio frequency slip ring, a stepping motor driver, a stepping motor controller, a network switch and a serial port server. The all-weather automatic detection and interference countermeasure system for unmanned aerial vehicles of the present invention can determine whether there are unmanned aerial vehicles in the surrounding airspace by extracting and analyzing the electromagnetic wave signals sent by the unmanned aerial vehicle when it communicates with the remote controller. exist. And signal monitoring mainly relies on signal detection and analysis modules, without manual intervention and participation; it is no longer limited by natural conditions such as night, rain, snow, overcast, haze, etc., so it can achieve all-weather duty.

The invention discloses a radio-frequency transmitting module, a radio-frequency transmitting component, a phased-array antenna and a production method thereof. The radio-frequency transmitting module comprises a first drive stage amplifier, a power dividing network, four transmitting channels, a power module and a wave control microwave daughter board, the radio-frequency transmitting component is formed by the lamination of two radio-frequency transmitting modules which are face-to-face and mirror images of each other; and the phased-array antenna is combined by fixing eight or an integer multiple of eight radio-frequency transmitting modules in a shell in parallel. According to the radio-frequency transmitting module, the radio-frequency transmitting component, the phased-array antenna and the production method thereof, the power amplifiers at various stages are all realized by ultra-broadband power amplifier chips, the chip utilizes a low-voltage power supply, the cost is low, the nonlinear characteristic is good, and the power synthesis is conveniently realized.

The invention discloses system architecture of a wideband radio frequency front end. The system architecture comprises a wideband transceiver, a transmitting module, a receiving module and a widebandantenna; the transmitting module comprises a wideband driving power amplifier, a wideband power amplifier and a transmitting module matching circuit; the receiving module comprises a wideband low-noise amplifier and a receiving module matching circuit; the transmitting module matching circuit comprises an input matching circuit in multiple bands, an inter-stage matching circuit in multiple bands,and an output matching circuit in multiple bands; and the receiving module matching circuit comprises an input matching circuit in multiple bands and an output matching circuit in multiple bands. By combining the matching circuit in multiple bands and a channel switching function of the radio frequency switch, the wideband power amplifier and the wideband low-noise amplifier are applied to the radio frequency front end module to replace the effects of multiple power amplifiers and multiple low-noise amplifiers, the transceiving in multiple bands is realized, the design difficulty and the design cost of the radio frequency front end circuit are reduced, and the integration level of the circuit is improved.

The invention relates to a radio frequency power source which is applied to a plasma reaction chamber. A frequency synthesis method or a radio frequency signal oscillator is adopted to generate N radio frequency signals and a wideband power amplifier is used for amplifying the N radio frequency signals, and then the amplified radio frequency signals are separated. Therefore, the radio frequency power with various frequencies is outputted by a radio frequency system. Electively, the frequencies can be switched, thereby users can select from the frequencies outputted by the radio frequency power source system. The invention further discloses a plasma reaction chamber which uses the radio frequency power source.

Embodiments of a Doherty amplifier device are provided, where the device includes a main amplifier that produces a first RF signal with a variable first output power and a peaking amplifier that produces a second RF signal with a variable second output power equivalent to the first output power multiplied by a power ratio n greater than one; first and second RF signals combined in phase at a combining node; and a main output matching network (OMN), wherein the main OMN forms a portion of an equivalent main path transmission line having a characteristic impedance equivalent to(n+1)·Ropt·R⁢⁢0,wherein Ropt is a load impedance seen at the main amplifier intrinsic current generator plane during a full power condition of the Doherty amplifier device and R0 is a load impedance seen at the combining node during a back-off power condition of the Doherty amplifier device.

An amplification stage and a wideband power amplifier are provided. The amplification stage includes a stage input terminal, a stage output terminal, an amplifier, an input compensation network, and in output compensation network. At the stage input terminal is received a signal which is provided via the input compensation network to the amplifier. The input compensation network filters the signal to allow a wideband operation of the amplification stage around an operational frequency. The amplified signal provided by the amplifier is provided via the output compensation network to the stage output terminal. The output compensation network configured to allow a wideband operation of the amplification stage around the operational frequency with a minimal phase shift and distortion of amplitude and phase frequency response. The wideband power amplifier includes a plurality of amplification stage combined with transmission lines or their lumped element equivalents in a specific circuit topology.

The invention discloses a global frequency range radio frequency (RF) power amplifier (PA), a global frequency range radio frequency front end (RFFE) module and a system thereof. The global frequency range RF PA can include at least one wide-band PA connected to a switch; the switch can guide an RF incoming signal to a plurality of transmission paths; each transmission path is configured according to different frequencies. The global frequency range RFFE is a more integrated version of the global frequency range RF PA, and can include a wide-band RF PA, a switch, a logic control device, a filter, a diplexer and other active and passive elements.

The invention discloses a wireless sensing network remote transfer transmission system suitable for network-coverage areas and a data transmission method thereof. The system comprises a novel gateway and a repeater. The novel gateway comprises a converge node unit, a first ARM processor unit, a first U / V frequency band wireless data transmission module, a first liquid crystal display (LCD) display unit, a first storage battery, a first solar power supply management unit, a first solar battery panel and a first wideband power amplifier. The repeater comprises a second U / V frequency band wireless data transmission module, a second ARM microprocessor unit, a second LCD display unit, a general package radio service (GPRS) module, a 3G module, a second storage battery, a second solar power supply management unit, a second solar cell panel and a second wideband power amplifier. The system integrates remote wireless transmission functions of U / V frequency bands, and is capable of being normally used in outdoor environment free of public wireless network. The U / V frequency band wireless data transmission modules can change frequency in real time by means of the frequency switching method, and anti-jamming performance is improved.