36 results about "Linear amplifier" patented technology

The invention provides a power supply circuit, a wireless communication system and a chip. Relates to the technical field of communication equipment, and can provide various power supply voltages for a radio frequency PA. The power supply circuit comprises a switch amplification circuit, a linear amplification circuit, a control circuit and an inductor. Wherein the control circuit comprises a mode detection circuit, a mode selection circuit and a hysteresis comparison circuit; the mode detection circuit is coupled to the first end of the inductor, the mode selection circuit is coupled to the switch amplification circuit, the hysteresis comparison circuit is coupled to the first end of the inductor and the second end of the inductor, and the mode detection circuit and the hysteresis comparison circuit are further coupled to the mode selection circuit.

The present invention discloses a visible light communication device based on a power line carrier circuit and a communication method thereof. The device includes: an Ethernet interface circuit, a power line carrier circuit, a switching switch, a signal attenuation circuit, a light source driving circuit, a light source, an avalanche photodiode, a photoelectric conversion circuit, a linear amplifier circuit, and a power detection circuit. The switching switch can switch the signal transmission mode from visible light communication to power line communication when the optical communication quality is poor, thereby improving the stability of the communication system. The power line carrier circuit modulates the signal in various ways, including OFDM, QPSK, BPSK, and ROBO. Compared with traditional visible light communication systems using OOK modulation, the communication rate and stability are significantly improved. The power detection circuit, the signal attenuation circuit, and the light source driving circuit cooperate to effectively control the power of the transmitted signal, enabling the signal to be transmitted without distortion. In addition, the power line can be replaced with a wire, twisted pair, etc., further improving the anti-interference capability and mobility.

The invention belongs to the technical field of output impedance matching circuits, and particularly relates to a passive output matching circuit of a linear amplifier with 2GHz bandwidth, which comprises a first circuit structure and a second circuit structure, the first circuit structure comprises two signal circuits, the second circuit structure comprises five metal wires, the five metal wires are parallel to one another, and the two signal circuits are connected with the first circuit structure. Two of the five metal wires are first five metal wires, and the other three metal wires are second metal wires. Aiming at the problem that the bandwidth of a common single-ended output impedance matching circuit is limited, the brand-new single-ended output impedance matching circuit is provided, a conventional capacitor inductor and a metal wiring structure are combined, linear output power under a wider frequency band is achieved, and particularly, under the condition that the insertion loss of the output power is the same, the linear output power can be improved. A common single-ended output impedance matching circuit realizes linear power output of 1GHz bandwidth, while the single-ended output impedance matching circuit can realize linear power output of 2GHz bandwidth.

An imaging method of a coherent Raman scattering imaging device based on spectral progressive scanning according to the present invention includes a synchronous two-color light source, a nonlinear amplification and spectral broadening module, a spectral progressive scanning control module, a linear amplification module, a beam combining and sample detection module, and a data processing module. The present invention does not require tuning a laser oscillator, nor does it require time scanning. By controlling the seed light and pump light of the nonlinear amplifier, adjusting parameters such as the dispersion, power, chirp of the seed light, and the pump power of the amplifier, the spectral evolution of the nonlinear amplifier is dynamically adjusted, so that it gradually transitions from a narrow spectrum to a wide spectrum, and from covering a single Raman peak to progressively covering multiple Raman peaks. This spectral progressive scanning coherent Raman light source can achieve simultaneous imaging of multiple chemical bonds, has a fast scanning speed, a flexible imaging method, and combines high spectral resolution and a wideband detection range, and also provides a new way to eliminate noise in coherent Raman scattering imaging.

A control console for a powered surgical tool. The console includes a transformer that supplies the drive signal to the surgical tool. A linear amplifier with active resistors selectively ties the ends of the transformer primary winding between ground and the open circuit state. Feedback voltages from the transformer windings regulate the resistances of the active resistors.

The invention belongs to the technical field of radiation monitoring, and particularly relates to a design method of a wide-range NaI (T1) detector, which comprises the following steps of: 1, connecting all lines of the NaI (T1) detector, and opening a multi-channel analyzer; 2, a 137Cs radioactive source is adopted, different preamplifier electronic gains are adjusted, the relation between the high voltage and the channel position where the characteristic energy of the 137Cs radioactive source is located is established, and energy spectrum data are output; 3, according to the output energy spectrum data, preamplifier electronic gain and linear amplifier high voltage needed by the detector are determined; and 4, under the determined preamplifier electronic gain required by the detector and the high voltage condition of the linear amplifier, different radioactive sources are adopted to carry out energy calibration on the detector, and whether digital gain needs to be adjusted is determined according to the energy calibration. According to the method, the measuring range of the sodium iodide gamma-ray spectrometer can be expanded, so that the sodium iodide gamma-ray spectrometer can cover high-energy radiation monitoring of 3MeV-10MeV or above.

The present invention provides a linear amplifier including an amplifier stage, a DC-shifting stage, a compensation network and a power stage. The amplifier stage is configured to generate a first signal and a second signal. The DC-shifting stage is configured to adjust a DC voltage of the first signal and a DC voltage of the second signal to generate an adjusted first signal and an adjusted second signal. The compensation network is configured to generate a first driving signal and a second driving signal according to the first signal, the second signal, the adjusted first signal and the adjusted second signal. The power stage is configured to generate an output signal according to the first driving signal and the second driving signal.

This invention discloses a relay-charge parallel envelope tracking power supply with multiplexed input sources, comprising: a stepped wave voltage generation circuit, an AB-class linear amplifier, a feedforward control circuit, and a pulse edge distribution unit. It improves upon conventional parallel envelope tracking power supplies by using a relay-charge switched-capacitor converter to generate a stepped wave voltage based on the modulated wave voltage output from the feedforward control circuit. By integrating a level providing unit and a level gating unit, it simultaneously reduces the switching frequency relative to the reference signal frequency l / k, thereby reducing switching losses. This facilitates further reducing the switching frequency while maintaining tracking bandwidth, simplifying the circuit structure. Multiplexing the input source of the stepped wave voltage generation circuit reduces linear amplifier losses and input power, further improving the overall circuit efficiency.

The utility model relates to a grid-connected control circuit for a bidirectional energy storage inverter. The grid-connected control circuit comprises a grid-connected loop, a sampling circuit and a protection loop, the grid-connected loop is connected with the power grid side input loop and the user side output loop at the same time, and on-off control of the power grid side and the user side is carried out through a relay. The sampling loop comprises a step-down transmitting circuit, a step-up transmitting circuit, a voltage division filter circuit and a linear amplification circuit, the step-down transmitting circuit converts an input voltage signal of a power grid side into a voltage transmitting signal, and the step-up transmitting circuit generates a voltage step-up signal; the two signals are simultaneously sent to the voltage division filter circuit, are amplified by the linear amplification circuit, and then are sent to the protection loop; the two electrical parameter acquisition alarm chips of the protection loop carry out voltage division sampling and output alarm signals to the four input AND gates, and the four input AND gates output signals to the relay to control the on-off of the relay. According to the grid-connected control circuit, grid-connected control is simplified, the system operation efficiency and stability are improved, and the energy conversion loss is reduced.

An envelope tracking power supply modulator (ETSM) and a wireless communication system are provided. A linear amplifier of the ETSM includes a pre-driver stage circuit and an output stage circuit. The pre-driver stage circuit receives an envelope input and generates a pre-driver output in accordance therewith. The output stage circuit generates an amplifier output of the linear amplifier in accordance with the pre-driver output, the amplifier output being used to set a modulated supply voltage for a power amplifier. A plurality of amplifiers of the output stage circuit includes first and second amplifiers. The first amplifier participates in setting the amplifier output when the power amplifier has a first output power level, and the second amplifier does not participate in setting the amplifier output. The first amplifier and the second amplifier participate in setting the amplifier output when the power amplifier has a second output power level that is different from the first output power level. Broad bandwidth envelope tracking is achieved with reduced quiescent current consumption, and efficiency of the power amplifier is improved.

The invention discloses an ultra-wideband high-harmonic suppression low-noise amplifier circuit, and relates to the technical field of integrated circuits. The circuit comprises an input predistortion low-noise amplifier, a waveform correction unit, an output high-linearity amplifier and a filtering unit which are connected in sequence. Through pre-distortion processing and waveform correction, secondary harmonic components generated by the two stages of inverting amplifiers are equivalent in amplitude, the phase difference is 180 degrees, mutual harmonic cancellation is achieved, high-frequency harmonics are filtered out through the filtering unit, and the problem that in-band secondary harmonics in an ultra-wideband amplifier are difficult to restrain is effectively solved. The amplifier has the advantages of ultra wide band, low noise, high gain, high linearity and high harmonic suppression ratio.

This application discloses a device and method for diagnosing the health status of a vibrating wire sensor, relating to the field of sensor status diagnosis technology. The device includes a main processor, a vibration signal generation module, a linear amplifier circuit, and a saturation amplifier circuit. The vibration signal generation module generates an excitation modulation signal to cause the vibrating wire of the vibrating wire sensor to vibrate. The vibration signal of the vibrating wire sensor is acquired by a signal processing unit. The linear amplifier circuit and the saturation amplifier circuit obtain a linear amplified signal and multiple harmonic signals. The main processor performs time-domain and frequency-domain signal processing on the linear amplified signal and multiple harmonic signals to obtain the signal-to-noise ratio (SNR) value and the duration of each harmonic signal. Based on the time-domain and frequency-domain signals, SNR value, and duration of each harmonic signal in the linear amplified signal and multiple harmonic signals, the health status of the vibrating wire sensor is determined and diagnosed. This application realizes automatic diagnosis of the health status of vibrating wire sensors.

The present disclosure relates to a clamping circuit for a TEC controller. The circuits and techniques described herein can use a clamping circuit to provide reverse drive compensation in applications where a thermoelectric cooler (TEC) device is to be controlled. The reverse drive compensation circuit can be used to inhibit or prevent the linear output stage of the TEC control circuit from being forced outside of its intended operating range. The clamping circuit can be implemented using a variety of circuit topologies, such as including a comparator arrangement with hysteresis. In another approach, a linear amplifier topology can provide clamping behavior, for example, by injecting or sinking current at an output node or an intermediate node to inhibit or prevent the output node or the intermediate node from being driven outside of a specified voltage range by an external source.

The application discloses a tire steel ring positive and negative detection instrument and a detection method, and the detection instrument comprises an MCU, a magnetic sensor array and a linear amplifier, and the probe signals on the magnetic sensor array are sent to the MCU through the linear amplifier. The magnetic sensor array comprises a plurality of magnetic sensors, and the plurality of magnetic sensors are arranged in the same plane. The application is safe and reliable, accurate detection is realized, the use of the MCU and the sensor guarantees the precise execution of the whole working process, and the tire steel ring is detected in real time.

An anti-clogging forced discharge valve for a tubular chain conveyor belongs to agricultural machinery. A C-shaped inner tube is rotatably installed within a fixed, inverted, grooved valve body. A C-shaped outer tube is fixedly fitted onto the outside of the inner tube. A C-shaped air passage is provided between the inner and outer tubes. A flexible air inlet pipe connects to the air passage via an air inlet nozzle. A rotating air nozzle is fitted at the lower part of the outer tube. A servo motor is connected to the rotating air nozzle. A stepper motor drives the inner tube to rotate via a drive gear and a driven gear. The automatic controller consists of a button module, a microcontroller, a servo motor drive module, a stepper motor drive module, a voltage linear amplifier, a D / A converter, and a display screen. The pneumatic transmission system includes a pressure sensor, an air compressor, an air tank, a filter, and an electro-proportional valve. This invention achieves air-assisted forced discharge and air-blowing anti-clogging at the discharge point of the tubular chain conveyor, featuring a reasonable structure, stable discharge, thorough discharge, and resistance to clogging.

An ultrasonic transmitter including a linear amplifier, an output stage, a switch, and a current compensation circuit. The linear amplifier includes first and second amplifier stages. The output stage has an input coupled to an output of the linear amplifier, and presents the transmitter output. The switch is coupled to the output of the linear amplifier. The current compensation circuit has an output coupled at the output of the first amplifier stage. Select circuitry is configured to couple the switch to a bias terminal when the switch is closed, and to couple one or more nodes of the switch to the control terminal of the current compensation circuit when the switch is open. The current compensation circuit generates a compensation current responsive to a sensed non-linear current conducted through the switch when open.

The invention discloses a high-bandwidth envelope tracking power supply adopting a high-order filter, which is characterized by comprising a step wave voltage generation circuit, a high-order filter circuit and a high-frequency compensation circuit. The step wave voltage generation circuit generates step wave voltage to perform preliminary fitting on an envelope signal; the high-order filter circuit adopts a high-order LC low-pass filter structure, so that high-frequency harmonic components in step waves are effectively filtered, and a voltage signal closer to an envelope signal is further obtained; and calculating a difference value between a result obtained in the previous step and a reference signal through a high-frequency compensation circuit, processing the difference value through a PID (Proportion Integration Differentiation) controller, transmitting the processed difference value to a linear amplifier for power amplification, and finally compensating to a load. According to the envelope tracking power supply, the current passing through the linear amplifier is reduced, the loss of the linear amplifier is reduced, and the efficiency of the envelope tracking power supply is remarkably improved.

Radar signal processing device (14) comprising: a signal receiver (20) which is configured to receive received data in a polar coordinate system based on a received signal; a data storage device for previous data, designed to store previous correlated data in the polar coordinate system; a polar coordinate correlator (21) designed to generate correlating data by establishing a correlation in the polar coordinate system between the received data and the previous correlated data stored in the data memory of previous data, have been carried out; a trend curve calculation module (22) configured to calculate a trend curve of a distance-direction signal level of the received data in the polar coordinate system; and a target acquisition module (24) which is trained to identify a target based on the signal level of the received data and the trend curve, wherein the polar coordinate correlator (21) modifies the contents of the correlation of the received data based on the target acquisition result of the target acquisition module (24), characterized in that the signal receiver (20) has a log amplifier (26) and a linear amplifier (32) and wherein the signal receiver (20) outputs a log amplifier (26) to the trend curve calculation module (22) and the target acquisition module (24) and outputs a linear amplifier (32) to the polar coordinate correlator (21).

The application belongs to the technical field of output impedance matching circuit, and specifically relates to a passive output matching circuit of a 2GHz bandwidth linear amplifier, which comprises circuit structure one and circuit structure two. The circuit structure one comprises two signal circuits, the circuit structure two comprises five metal wires, the five metal wires are parallel to each other, two of the five metal wires are first five metal wires, and the other three metal wires are second metal wires. The application proposes a novel single-ended output impedance matching circuit aiming at the problem that the bandwidth of a common single-ended output impedance matching circuit is limited, and realizes linear output power under a wider frequency band by combining conventional capacitors, inductors and metal wire structures. Specifically, under the condition that the insertion loss of output power is the same, the common single-ended output impedance matching circuit realizes linear power output of 1GHz bandwidth, and the application can realize linear power output of 2GHz bandwidth.

The application discloses a power supply of a broadband envelope tracking power amplifier, comprising a linear amplification circuit, a comparison circuit and a switching amplification circuit; the linear amplification circuit comprises a linear amplifier, a switching amplifier two and an envelope bandwidth processing unit, the input end of the envelope bandwidth processing unit is used for accessing an envelope, the output end of the envelope bandwidth processing unit is connected with the input end of the switching amplifier two, the output end of the switching amplifier two is used for providing a voltage signal to the linear amplifier, and the input end of the linear amplifier is used for accessing the envelope; the output end of the linear amplifier is connected with the input end of the comparison circuit, the output end of the comparison circuit is connected with the input end of the switching amplification circuit, and the output end of the linear amplifier and the output end of the switching amplification circuit are used for providing a power supply signal to the broadband envelope tracking power amplifier. The application changes the design of the linear power supply, improves the efficiency of the linear power supply at the peak envelope, and thus can improve the overall efficiency of the envelope tracking power supply without reducing the performance.

A power amplifier (PA) circuit includes circuitry for generating a supply voltage at an upper voltage rail of the power amplifier (PA). The circuit includes a DC-to-DC converter for generating a voltage from which the supply voltage is generated; a linear amplifier for sourcing current to or sinking current from the upper voltage rail via a capacitor to perform fine regulation of the supply voltage; a first switching device coupled between an output of the linear amplifier and the lower voltage rail to selectively assist the linear amplifier in sinking current through the capacitor to cope with actual or expected transient responses of the supply voltage; and a second switching device coupled between the upper voltage rail and the lower voltage rail to selectively discharge the capacitor in response to actual or expected transient responses of the supply voltage.

The application belongs to the technical field of laser, and relates to a high-energy ultrashort pulse laser. The laser comprises a mode-locked fiber laser oscillator, a nonlinear amplifier, a stretcher, a pulse selection module, a pre-amplification stage, a main amplification stage and a compressor. In the laser, the cavity dispersion of the mode-locked fiber laser oscillator is negative dispersion which is designed optimally, and the output pulse is injected into the nonlinear amplifier after pre-chirp management, so that a flat wide spectrum can be obtained; the stretcher, the pulse selection module, the pre-amplification stage, the main amplification stage and the compressor are combined to realize further efficient amplification of the injected pulse. The application can adopt a full polarization maintaining structure which has high stability and reliability, and realizes common use of nonlinear amplification and chirped pulse amplification technology, so that the gain narrowing problem in the traditional chirped pulse amplification process can be overcome, the single pulse energy amplification limit of the nonlinear amplification technology can be broken through, and finally the output of high-energy ultrashort laser pulse is realized.

A control console for a powered surgical tool. The console includes a transformer that supplies the drive signal to the surgical tool. A linear amplifier with active resistors selectively ties the ends of the transformer primary winding between ground and the open circuit state. Feedback voltages from the transformer windings regulate the resistances of the active resistors.

The invention provides a low-voltage AGC (Automatic Gain Control) circuit for an inductance encoder. The device is characterized by comprising a sine channel PreAmp (1), a cosine channel PreAmp (2), a sine channel dB linear amplifier (3), a cosine channel dB linear amplifier (4), a phase difference circuit (5), a vector amplitude synthesis circuit (6), a quantization circuit (7), a digital algorithm circuit (8), a sine channel output buffer (9) and a cosine channel output buffer (10). According to the invention, an innovative full-simulation vector amplitude synthesis circuit is adopted to replace a traditional switched capacitor scheme, so that the technical bottleneck that the signal amplitude cannot be accurately detected in a low-voltage environment is successfully overcome, and the AGC system can stably work and accurately control the output amplitude at the low voltage of less than or equal to 3.3 V. In combination with a wide dynamic range brought by a dB linear amplifier and precise control of a digital intelligent algorithm, the circuit finally provides a complete low-voltage solution with high response speed, ultrahigh amplitude stability and excellent anti-interference capability for an inductance encoder, and is particularly suitable for low-power-consumption scenes such as portable equipment and the Internet of Things.

An envelope tracking system for a power amplifier (PA) is provided, which is configured to track the envelope component of a radio frequency (RF) signal over a wide bandwidth. The system comprises an auxiliary DC-to-DC converter, a main DC-to- DC converter, a fast switcher (in the form of a properly configured DC-to-DC converter) and a linear amplifier (LA). The auxiliary and main DC-to-DC converters are powered by a battery and generate output signals based on corresponding control signals. Each of the LA and the third DC-to-DC converter is fed with the output signal of the auxiliary DC-to-DC converter. The LA generates an output signal based on a modulation signal derived from the envelope component of the RF signal. The fast switcher generates an output signal based on a control signal, the modulation signal and a first error signal being a replica of the LA output signal. The main DC-to-DC converter further uses a second error signal to generate the second output signal, which is a replica of a combination of the output signal from the fast switcher and the LA output signal. The output signals from the main DC-to-DC converter, the fast switcher and the LA are combined into a PA supply at an output port of the ET system. The LA further uses a feedback signal to generate the LA output signal, which is defined based on the PA supply. There is a low-pass filter at the output of each of the DC-to-DC converters and the fast switcher, and each of the LA and the fast switcher is connected to the output port via a common or different AC coupling capacitor.

The embodiment of the utility model relates to an intelligent alternating-current voltage-stabilizing power supply system which is composed of an analog voltage detector, a digital voltage detector, a comparator, a linear amplifier, a switching amplifier, a linear regulator, a switching regulator, a controller and an analog quantity module. And the changes are counteracted by adjusting part of output voltage, so that rapid and accurate adjustment is realized, constant voltage output is provided, and sensitive electronic equipment is protected from being influenced by fluctuation of a power grid.

This invention discloses a power modulator and a high-speed envelope tracker based on multi-band current injection. The power modulator includes a linear amplifier, a first current detection circuit, a low-speed DC-DC converter, a second current detection circuit, and a high-speed DC-DC converter. The linear amplifier clamps the voltage at the power supply terminal to track the envelope signal; the low-speed DC-DC converter provides the DC and low-frequency components of the current required by the power amplifier; and the high-speed DC-DC converter provides the mid-to-high frequency transient components of the current required by the power amplifier, so that the real-time output current of the linear amplifier approaches zero. This invention constructs a low-speed, high-speed, and linear integrated current supply system, achieving seamless coordination of multiple power supplies. This brings the overall system efficiency close to the theoretical limit of switching power supplies, solving the problems of excessive linear amplifier load, limited overall system performance, and the contradiction between dynamic response accuracy and power consumption in existing architectures.

The present application belongs to the technical field of integrated circuits, and particularly relates to a digital control envelope tracking power modulator. The envelope tracking power modulator comprises a digital control current source array, a switching amplifier, a digital-to-analog converter, and an off-chip power inductor. One end of the power inductor is connected to the output of the digital control current source array and the feedback input end of the switching amplifier, and the other end is connected to the output of the switching amplifier. The output of the digital-to-analog converter is connected to the reference voltage input end of the switching amplifier. The present application provides high-frequency current to the load through the digital control current source array, provides low-frequency current to the load through the switching amplifier, and controls the switching amplifier through the digital-to-analog converter. The present application removes the linear amplifier in the traditional hybrid architecture envelope tracking power modulator, and relies on the digital control current source array to generate the high-bandwidth envelope power at a very high speed to power the power amplifier, thereby improving the overall efficiency of the system.