1707 results about "Audio power amplifier" patented technology

A system and method are used to maintain a variance in feedback factors of an amplifier between the first and second phases either below a threshold value or within a specified range. The system includes the amplifier and first through third capacitances. The amplifier is coupled between an input node and an output node that operates during first and second phases of operation. The first capacitance is coupled across the amplifier and between the input node and the output node during the first and second phases of operation. The second capacitance is coupled to the input node during the first phase of operation. The third capacitance is coupled to one of the input and output nodes during one or both of the first and second phases of operation.

A power amplifier includes a 3-dB coupler which splits a first signal into a second signal and a third signal lagging behind the second signal by 90°, a carrier amplifier, a peak amplifier, and a hybrid coupler. The carrier amplifier amplifies the second signal and outputs a fourth signal when the first-signal power level is a first level or higher. The peak amplifier amplifies the third signal and outputs a fifth signal when the first-signal power level is a second level or higher, which is higher than the first level. The hybrid coupler includes a first transmission line receiving the fourth signal at its first terminal, and a second transmission line receiving the fifth signal at its first terminal and being open at its second terminal. The first transmission line outputs, from its second terminal, an amplified first signal obtained by combining the fourth and fifth signals.

The invention is suitable for the technical field of communication, and particularly relates to a method for detecting mismatched harmonic waves of a power amplifier. The method comprises the steps that a first power detection unit is connected with a coupler through a control unit, the standing-wave ratio of a to-be-detected power amplifier chip is adjusted to be 1: 1 through a tuner, and the power of an input signal of a vector signal generator is adjusted till the target power of the to-be-detected power amplifier chip is reached; the second power detection unit is connected with the coupler through the control unit, the output standing-wave ratio of the to-be-detected power amplifier chip is adjusted to a preset specific value through the tuner, and when the tuner modulates phases at intervals of preset degrees, the harmonic power of the to-be-detected power amplifier chip in each phase is recorded through the second power detection unit. Compared with the prior art, the method can accurately test and evaluate the harmonic wave of the to-be-tested power amplifier chip under the mismatched standing wave condition, thereby evaluating the harmonic wave index of the to-be-tested power amplifier chip.

The invention discloses a multi-modal stimulation regulation and control system combining interactive feedback and AI self-adaption. The system comprises an AI main control and synchronization module which generates a unified rhythm time sequence; the acoustic stimulation output module outputs a rhythm acoustic signal; the visual LED stimulation module outputs rhythm visual signals; the game / animation interaction module provides an interaction task synchronized with the acousto-optic rhythm; the sensing acquisition and feedback module is used for acquiring multi-modal physiological and behavior data in real time; the amplifier output module drives the execution module or equipment; the power management module realizes voltage stabilization and low power consumption switching; the behavior habit forming mechanism module binds a stimulation signal and an interaction task; and the human-assisted management interface module supports remote parameter setting and real-time monitoring. The interactive feedback and AI self-adaptive multi-mode stimulation regulation and control system is combined, microsecond-level synchronization and multi-source closed-loop self-adaption of sound and light and animation can be achieved, a guidance scheme for personalized customization of treatment and behavioral habit cultivation can be achieved, and the efficiency, accuracy and effectiveness of system regulation and control are remarkably improved.

The invention relates to the technical field of radio frequency integrated circuits, in particular to a harmonic suppression power amplifier combining a matching network and a feed network, which comprises a transistor, an input matching module, an output matching module, a stabilizing module and a bias module, the input matching module comprises a first parallel resonance unit, the first parallel resonance unit is used for second harmonic suppression, the output matching module comprises a series resonance unit and a second parallel resonance unit, the series resonance unit is used for resonating at a second harmonic frequency and performing low-impedance grounding on the second harmonic, and the second parallel resonance unit is used for resonating at a second harmonic frequency and performing low-impedance grounding on the second harmonic. The second parallel resonance unit is used for resonating at a third harmonic frequency and forms a high-impedance open circuit for the third harmonic, the output matching module is coupled to a drain electrode of the transistor, and the bias module comprises a grid bias sub-module and a drain bias sub-module. The grid bias sub-module is coupled to a connection node of the input matching module and the grid of the transistor, the drain bias sub-module is coupled to the output matching module, and the bias voltage of the transistor is jointly determined by the grid bias sub-module and the drain bias sub-module. The power amplifier has the effect of improving the efficiency level of the power amplifier while realizing harmonic suppression optimization.

The invention relates to the technical field of wireless communication, and provides a power amplifier, a power amplification module and a multi-mode multi-frequency power amplifier, the power amplifier comprises a first-stage low-frequency power amplifier, a second-stage low-frequency power amplifier, a harmonic suppression circuit, a first output matching circuit, a first filter circuit and a second filter circuit; the first-stage low-frequency power amplifier and the second-stage low-frequency power amplifier are used for amplifying low-frequency-band signals, the harmonic suppression circuit is used for suppressing harmonic waves output by the first-stage low-frequency power amplifier and the second-stage low-frequency power amplifier, and the output end of the first output matching circuit is used for outputting signals; and the first output end of the first filter circuit and the output end of the second filter circuit respectively provide filtered power supply voltage for the first-stage low-frequency power amplifier and the second-stage low-frequency power amplifier. According to the invention, the harmonic leakage of the multi-mode multi-frequency power amplifier can be optimized.

The invention relates to the technical field of audio driving, in particular to a driving circuit and method and electronic equipment. The method comprises the following steps: arranging two boosting units at the output end of the power amplifier, respectively receiving two paths of signals with opposite phases output by the power amplifier so as to realize that boosted signals output by the two boosting units are also signals with opposite phases, arranging one boosting unit to be connected with the positive electrode of the piezoelectric ceramic module, and arranging the other boosting unit to be connected with the negative electrode of the piezoelectric ceramic module; and the other boosting unit is connected with the negative electrode of the piezoelectric ceramic module, so that the driving voltage of the piezoelectric ceramic module is increased. The boost unit is simple in structure, occupies a small area of a circuit board, and can be effectively applied to miniaturized electronic equipment.

The invention provides a low-noise amplifier and a radio frequency front-end module, and the low-noise amplifier comprises an input matching circuit, a first-stage power amplification circuit, an inter-stage matching circuit, a second-stage power amplification circuit and an output matching circuit. The inter-stage matching circuit comprises a first inductor, a second inductor and a first capacitor; the second-stage power amplification circuit is of a cascode structure; and the output matching circuit comprises a third inductor and a fourth inductor which are coupled with each other. According to the low-noise amplifier, the high-frequency gain, the in-band gain flatness, the isolation degree, the stability and the output matching bandwidth of the low-noise amplifier can be improved.

The utility model provides a kind of electrostatic discharge protection circuit and low noise amplification module, the electrostatic discharge protection circuit is applied to low noise amplification circuit, the low noise amplification circuit includes input matching circuit and the low noise amplifier of the output end being connected to the input matching circuit;The electrostatic discharge protection circuit includes inductance and resistance;The first end of the inductance is used to connect to the signal input end of low noise amplifier;The first end of the resistance is connected to the second end of the inductance, and the second end of the resistance is grounded.The electrostatic discharge protection circuit in the utility model is connected to the input end of low noise amplifier, and the noise coefficient of low noise amplifier will not be deteriorated, and the performance of low noise amplifier will not be affected, and the input stability of low noise amplifier will not be affected simultaneously.

A device and method for representing the foam porosity state of foamed lightweight soil with self-adjusting beams, and relates to the technical field of sound absorption coefficients measurement; the device includes a standing wave tube, a plurality of polyvinylidene fluoride piezoelectric films, a sensor, an exciter, a push-pull handle, an adjustable telescopic tube, a foamed lightweight soil detection material, a charge amplifier, a data memory, a data adapter, a signal generator, an adaptive power amplifier board, and a PC computer; the device of the invention has low cost, long service life, high measurement accuracy, relatively simple production process, and can be applied to different scenarios.

An electronic device may include a transmitter coupled to an antenna over a signal path that runs through a front end module. The front end module may include a power amplifier disposed on the signal path. The front end module may include first, second, and / or third signal attenuators disposed on the signal path between an input of the amplifier and the transmitter. The front end module may include a voltage sensor that measures a bias voltage of the amplifier, a temperature that measures a temperature of the amplifier, and / or an impedance sensor that measures an impedance of the antenna. The first signal attenuator may be adjusted based on the measured bias voltage, the second signal attenuator may be adjusted based on the measured temperature, and the third signal attenuator may be adjusted based on the measured impedance to mitigate changes in the amplifier as operating conditions change over time.

Methods and systems for NN-based digital pre-distortion for digital envelope tracking power amplifiers. A computer-implemented method includes receiving a measure of a digital envelope at a digital pre-distortion module having a neural network (NN)-based digital pre-distortion structure for digital envelope tracking (DET), receiving a transmit signal at the digital pre-distortion module, inputting the measure of the digital envelope and the transmit signal into the NN-based digital pre-distortion structure to produce a pre-distorted transmit signal, adjusting nonlinearity compensation of a power amplifier based on the measure of the digital envelope, and using the adjusted nonlinearity compensation of the power amplifier to produce an output signal.

The invention discloses a Ka-band 2000W solid-state power amplifier, which relates to the field of power amplifiers, and comprises a Ka monitoring and pre-stage power amplifier, a Ka final-stage power amplifier and a Ka high-power synthesis network, the Ka monitoring and pre-stage output end is in flexible connection with the eight Ka last-stage power amplifiers, and the Ka last-stage power amplifiers are in hard connection with the Ka high-power synthesis network through waveguides. A solid-state system is adopted for design, a domestic GaN solid-state power amplifier chip is utilized for synthesis, the power amplifier adopts a low-voltage working mode, the power chip is long in service life, the linear index of the power amplifier is good, and the power amplifier is different from the defects that a vacuum tube power amplifier is large in size and weight, has breakdown risks during high-voltage working and cannot respond to emergency scenes immediately. The Ka-band high-power amplifier is a development trend of a Ka-band high-power amplifier, and has the advantages of high output power and convenience in maintenance.

The invention relates to the technical field of electronic circuits, in particular to a radio frequency front-end lightning protection circuit and lightning protection equipment. The circuit comprises a primary discharge module, a radio frequency signal protection branch and a direct current power supply protection branch, the input end of the primary discharge module is connected with an antenna port, and the primary discharge module is used for discharging high-energy pulses generated by lightning stroke; the radio frequency signal protection branch is connected between the output end of the primary discharge module and a low noise amplifier of the radio frequency receiving link, and is used for coupling a radio frequency signal to the low noise amplifier and carrying out isolation and voltage limiting on a lightning stroke residual pulse; the direct current power supply protection branch circuit is connected between the output end of the primary discharge module and a power supply voltage stabilizer of the direct current power supply link, and is used for transmitting a direct current power supply to the power supply voltage stabilizer and carrying out isolation and voltage limiting on the lightning stroke residual pulse. The circuit can be combined with a radio frequency front end and used for a navigation antenna, and the lightning stroke protection capability is improved.

Wireless circuitry can include a radio-frequency amplifier configured to operate in a plurality of different mode, configuration, or bias settings, a power detector coupled to an output of the radio-frequency amplifier, a plurality of power integrators, and a switching circuit having an input configured to receive a measured power level from the power detector and having outputs coupled to the plurality of power integrators. The switching circuit can have a switch state that is adjusted based on a current mode, configuration, or bias setting for the radio-frequency amplifier. The power integrators may be part of multiple power control loops. The power control loops can be coupled to additional switching circuitry activated based at least party on the current mode, configuration, or bias setting and a subsequent mode, configuration or bias setting for the radio-frequency amplifier.

Apparatus and methods for power amplifier signal limiting are disclosed. In certain embodiments, a front-end system includes a low noise amplifier that amplifies a radio frequency receive signal during a receive frame, a power amplifier that amplifies a radio frequency transmit signal during a transmit frame, and a signal limiter operable to limit a signal power of the power amplifier in an attenuating mode. The signal limiter includes a radio frequency detector configured to generate a detection signal based on detecting a power level of the radio frequency transmit signal, and a latch that locks the signal limiter in the attenuating mode in response to activation of the detection signal. The latch is reset by a bias signal of the power amplifier that is activated during the transmit frame and deactivated during the receive frame.

Systems and techniques are provided for power amplifier gain error compensation for a Digital Power Amplifier (DPA). In some aspects, a compensation method includes obtaining in-phase (I) and quadrature-phase (Q) components of a baseband sample corresponding to in-phase input amplitude codes and quadrature-phase input amplitude codes. The in-phase input amplitude codes can be distorted based on first gain pre-compensation information corresponding to an in-phase signal branch of the DPA, to generate pre-distorted output amplitude codes of the I component. The quadrature-phase input amplitude codes can be distorted based on second gain pre-compensation information corresponding to a quadrature-phase signal branch of the DPA, to generate pre-distorted output amplitude codes of the Q component. The DPA can be driven using the pre-distorted output amplitude codes of the I and Q components to generate a Radio Frequency (RF) output.

An example apparatus includes: equalizer circuitry having first and second inputs and an output, the equalizer circuitry configured to adjust an audio signal at the first input responsive to coefficient values at the second input; amplifier circuitry having an input coupled to the output of the equalizer circuitry, and having an output; control circuitry having a first input coupled to the first input of the equalizer circuitry, having a second input coupled to the output of the amplifier circuitry, and having an output coupled to the second input of the equalizer circuitry, the control circuitry configured to determine a resonant frequency of a speaker device responsive to the audio signal and a signal at the output of the amplifier circuitry, and to provide the coefficient values at the output of the control circuitry responsive to the resonant frequency of the speaker.

Aspects relate to signaling relating to a non-linearity model for power amplifier circuitry of a transmitting device. The power amplifier circuitry may apply digital pre-distortion (DPD) to a signal prior to amplification and transmission of the signal. A receiving device may apply digital post-distortion (DPoD) to a signal received from the transmitting device where the DPoD is based on the non-linearity model. The transmitting device may send to the receiving device non-linearity parameters for the non-linearity model.

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 relates to the technical field of radio frequency integrated circuits, and discloses a low-noise voltage-controlled oscillator circuit which comprises a source electrode following low-noise bias circuit with digital calibration, a source electrode following low-noise bias circuit with digital calibration, a source electrode following low-noise bias circuit with digital calibration and a source electrode following low-noise bias circuit with digital calibration, the cross-coupled amplifier array is composed of a plurality of units, and the source electrode of the cross-coupled amplifier array suppresses low-frequency noise through a resistance-capacitance feedback network and receives a digital amplitude calibration signal so as to dynamically adjust the number of working units and stabilize the output amplitude; the amplitude self-calibration loop consists of digital logic and a peak detector; the switched capacitor unit array is provided with stable direct-current bias; and a wide linear variable capacitor array driven by the stepped bias voltage. Through deep fusion of digital and analog technologies, the phase noise is remarkably reduced, the linear tuning range is widened, the amplitude stability is ensured, the power consumption is reduced, and the method is particularly suitable for a high-performance radio frequency communication chip of the Internet of Things.

A method includes determining whether an audio signal processed in a class-D amplifier is clipping. Responsive to clipping of the audio signal, a speaker voltage is estimated as a ratio of a power supply voltage of the class-D amplifier to a resistance of a speaker driven by the class-D amplifier. An amplitude of the audio signal is controlled based on the speaker voltage.

The invention is suitable for the technical field of power electronics, and provides a high-voltage amplifier control method, device and equipment, and the method comprises the steps: generating a dynamic power supply voltage rail, and extracting an error signal output by the dynamic power supply voltage rail and a target; the error signal is decomposed into at least two frequency components, and the frequency components are respectively processed by adopting a differentiated amplification strategy. The processed components are synthesized into a compensation signal, and the compensation signal is superposed with the power supply voltage rail, so that a high-fidelity final output signal is generated. According to the invention, the efficiency is improved through dynamic power supply, the residual error signal is subjected to frequency division, and a differential strategy is adopted for accurate compensation, so that various distortions and noises are effectively eliminated, and the unification of high efficiency and high precision is realized.

Provided are an audio playing module and an audio processing circuit thereof, and an electronic device, which belong to the technical field of electronics. In the audio processing circuit, by adding a feedback control circuit between a power circuit and an audio amplifier, the feedback control circuit can control, according to a change in the amplitude of an audio signal received by the audio amplifier, the power circuit to adjust a power supply voltage provided for the audio amplifier. Thus, when the amplitude of the audio signal changes, an appropriate power supply voltage can be matched for the audio amplifier by means of the feedback control circuit, thereby solving the problem of the audio playing module generating whistling when the amplitude of the audio signal changes, and thus optimizing the sound quality of played sounds.

Wireless circuitry is provided that includes an antenna and a radio-frequency amplifier coupled to the antenna. The radio-frequency amplifier can include a first input transistor having a drain terminal coupled to a first node, a second input transistor having a drain terminal coupled to a second node, and a common mode impedance tuning circuit coupled between the first and second nodes. The common mode impedance tuning circuit can be configured to tune a common mode impedance at the first and second nodes of the radio-frequency amplifier. The common mode impedance tuning circuit can be configured to provide a first common mode impedance when the amplifier is operating in accordance with a first set of operating conditions and can be configured to provide a second common mode impedance, different than the first common mode impedance, when the amplifier is operating in accordance with a second set of operating conditions.

An analog frontend architecture for a capacitive pressure sensor. The analog frontend architecture includes a low-noise amplifier unit for low-noise amplification of sensor signals of the capacitive pressure sensor, the low-noise amplifier unit including a first integrator unit and a second integrator unit, the first integrator unit being connected to input terminals of the low-noise amplifier unit, being designed as a boxcar integrator, and being configured to amplify sensor signals of the capacitive pressure sensor according to the boxcar integration technique, and the second integrator unit being connected to output terminals of the low-noise amplifier unit and being configured to integrate the amplified voltage signals of the first integrator unit.

A radio-frequency module includes one or more first electronic components disposed on one main surface and one or more second electronic components disposed on another main surface. The one or more first electronic components include at least one of a filter whose passband includes a first band, a switch connected to the filter, a power amplifier connected to the filter, and a switch connected to the filter. The one or more second electronic components include at least one of a filter whose passband includes a second band in which the frequency of a harmonic wave of a signal in the first band is included, a switch connected to the filter, a low-noise amplifier connected to the filter, and an inductor connected to a path that forms a connection between the first low-noise amplifier and an antenna connection terminal.

A Doherty power amplifier (PA) includes a main amplifier, an auxiliary amplifier, a first inductor coupled between an output of the main amplifier and a first node, a second inductor coupled between an output of the auxiliary amplifier and the first node, and a third inductor coupled between a supply rail and the first node. The Doherty PA also includes a first capacitor coupled between the output of the main amplifier and a ground, a second capacitor coupled between the output of the auxiliary amplifier and the ground, and an impedance matching circuit coupled between the output of the auxiliary amplifier and an output of the Doherty PA.

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 relates to a low-power-consumption high-performance D-type power amplifier modulation method and circuit and a D-type audio power amplifier, and the method comprises the steps: separating a pair of BD mode modulated signals outputted by a PWM modulation module in the D-type audio power amplifier circuit into a common mode component and a differential mode component, and outputting the common mode component and the differential mode component; feeding back the common-mode component and the differential-mode component to a differential input end through a common-mode feedback link and a differential-mode feedback link respectively; wherein the common-mode component and the common-mode feedback link are completely arranged in the chip; the differential mode component and the differential mode feedback link are realized by a power MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) integrated inside the chip or an external power MOSFET; and outputting the differential mode component to a to-be-driven object through the power output stage. According to the method, after two feedback links are separated, in a zero-input mute state, no common-mode signal is sent to an output stage for amplification, and power consumption is not caused at the output stage, so that the overall efficiency is greatly improved; and meanwhile, static bottom noise is almost eliminated.