30 results about "Amplifier" patented technology

The present disclosure illustrates a feedforward controlled envelope modulator and a feedforward control circuit thereof. The feedforward controlled envelope modulator comprises a linear amplifier circuit, a switching amplifier, and a feedforward control circuit. The linear amplifier circuit amplifies an input voltage signal, so as to output an output voltage signal to a load node. The switching amplifier receives a comparison signal, and outputs a switching current to the load node according to the comparison signal. The feedforward control circuit comprises a duplicate linear amplifier circuit and a hysteresis comparator. The duplicate linear amplifier circuit amplifies the input voltage signal, so as to output a reference voltage signal, wherein an amplifying gain of the duplicate linear amplifier circuit is identical to an amplifying gain of the linear amplifier circuit. The hysteresis comparator compares the output voltage signal and the reference voltage signal, so as to output the comparison signal.

The invention discloses an analog circuit for detecting the wire breaking of a displacement sensor LVDT, which comprises a displacement sensor LVDT, wherein a primary coil of the displacement sensor LVDT is connected with an excitation signal source. The analog circuit for detecting the wire breaking of the displacement sensor LVDT is characterized in that the output ends of the secondary coils of the displacement sensor LVDT are respectively connected with a test signal and are respectively connected with a multi-channel selection switch through a filter and rectifier circuit, and predetermined different groups and combinations of wire breaking voltages which are output when an LVDT is disconnected are simultaneously connected with the multi-channel selection switch; the two output end voltages of the secondary coils of the LVDT are respectively combined with a group of comparison voltages to be connected with each comparator, and each comparator is connected with the output control end of the multi-channel selection switch through an arithmetic logic OR unit, and the multi-channel selection switch is simultaneously connected with a servo amplifier. The invention can directly achieve the detection of wire breaking state only by a hardware circuit, and the method is simple and reliable.

An ultra wideband active antenna platform can be deployed globally. A plug-and-play radio unit is removably attached to an outside of the active antenna. The PAPR can be removably plugged into a docking station to provide different technology or frequency bands specific for customers in different regions without the costly replacement of the whole antenna.

In addition, the heat-generating sources (power amplifiers) with heavy heatsink structures are separated from the main antenna body, so that the whole active antenna can be installed separately since the installation weight of the antenna would be reduced.

The invention relates to an all-optical dispersion monitor based on an optical parameter amplifier. The all-optical dispersion monitor comprises a semiconductor laser, a coupler, the optical parameter amplifier, an output optical filter and an optical power meter. The semiconductor laser emits low-power continuous detection light. The continuous detection light and signal light are combined through the coupler and are filled into the optical parameter amplifier. The optical parameter amplifier is based on first-order four-wave mixing effect which causes energy to be transferred to detection waves and idle waves from the signal light. The detection waves and the idle waves with exponential gains are output, pass through the output optical filter and are measured by the optical power meter. The invention has the advantages that the response speed is fast, the sensitivity is high, the working waveband is wide, the signal rate and the modulation format are transparent, the monitor can be used for the dispersion monitoring of a WDM system with single channel rate above 100Gb/s, the high-speed photoelectric device and the signal processing circuit are not required during measurement, and the cost of devices is reduced.

The invention discloses a focused ultrasound-polymeric micelle controllable drug release device and a release method thereof. The device is characterized by consisting of a focused ultrasound system and a drug loaded polymeric micelle system, wherein the focused ultrasound system is connected with a focused ultrasound energy converter (3) by a signal generator (1) through a power amplifier (2); the drug loaded polymeric micelle system consists of a complex micelle (5) formed by amphiphilic block copolymers and drugs and a medium (4); and a drug loaded polymeric micelle is internally provided with a sensor (6) which is connected with a computer (8) through a signal processor (7). The focused ultrasound-polymeric micelle controllable drug release method comprises the step that the drug carried polymeric micelle is prepared through a dialysis method or a solvent evaporation method, and under ultrasonic irradiation, the polymeric micelle responds to ultrasound through a physical or chemical change so as to ensure that loaded hydrophobic drugs are released from the micelle and enter a focal part.

Techniques are presented for providing misinformation detection in online content. The described techniques can identify instances of misinformation in online content and pass a misinformation result to the user. A misinformation probability analysis can be performed by applying a syntactic analysis and a semantic analysis to detect misinformation with confidence by applying featurization to a URL, text of content referenced by the URL, and metadata associated with the URL using a feature set, the feature set comprising semantic-based features and syntactic-based features, wherein the semantic features and the syntactic features are selected from the group consisting of: sentiment amplifiers, sentiment continuity disruption features, lexical features, keywords, baseline features, speech act, sensicon features, emotion detection on the obtained text, exaggerated language, strong adjectives, heuristics, bag-of-words, objectivity, colloquial-ness score, and semantic difference.

The present invention relates to a power control method and device. The method comprises: a base station separately determining, according to terminal types of n currently scheduled terminals, error vector magnitude (EVM) index adjustment parameters of the n terminals; processing signals to be transmitted of the n terminals according to the EVM index adjustment parameters of the n terminals so as to obtain output signals, and determining the total power change of the output signals with respect to the signals to be transmitted; and dynamically controlling a power voltage of a power amplifier according to the total power change of the output signals with respect to the signals to be transmitted. By means of the power control method and device provided in embodiments of the present invention, different processing is performed on signals of different terminals, the balance between the total power of an OFDM system, the EVM, and the efficiency of the power amplifier is achieved, and system performance of the OFDM system is improved.

An air amplifier apparatus and method for transferring or filling sand particles into a flask of a molding machine. A plurality of nozzles are each mounted with respect to the molding machine. A pressurized fluid, such as discharged from an air compressor or other pressure forming device, delivers pressurized fluid into each nozzle. The pressurized fluid flows through a passageway of each nozzle and can follow a Coanda profile as it accelerates the particles through the passageways. The accelerated particles are then discharged into a void formed by the flask of and pattern in the molding machine.

The invention discloses a method and device for monitoring ash dirt on a convection heating surface of a boiler. The device comprises a sound wave guide tube, a sound wave receiver, a sound wave generator, a signal conditioner, a junction box, an input and output device, a power amplifier and an industrial personal computer. The method comprises the steps of: firstly, sending a sound wave signal by the industrial personal computer, amplifying with the power amplifier and then sending to the sound generator; secondly emitting sound wave by the wave generator, spreading the sound wave to a hearth of the boiler through the sound wave guide tube, receiving a sound wave return signal of the hearth of the boiler by the sound wave receiver, transmitting the sound wave return signal to the industrial personal computer; thirdly, measuring sound wave crossing time by the industrial personal computer, and solving the smoke side temperature of the boiler; and finally, solving an actual heat exchange coefficient and obtaining an ash dirt coefficient. The invention adopts a non-contact measurement manner, and can be applied to environments with high temperature and much dirt and pollution; and the device is simple in operation, and provides a clear and simple visualization interface.

The invention discloses a broadband integrated Doherty power amplifier based on a low-Q output network, the saturation power of an auxiliary power amplifier is n times that of a main power amplifier,n is greater than or equal to 1, and the optimal load impedance of the auxiliary power amplifier is 1/n of that of the main power amplifier; a main power amplifier output matching network is a first low-pass equivalent lambda/4 line, and the characteristic impedance of the main power amplifier output matching network is multiple times the optimal load impedance of the main power amplifier; an auxiliary power amplifier output matching network is formed by connecting a second low-pass equivalent lambda/4 line and a high-pass equivalent lambda/4 line in series, the characteristic impedance of thesecond low-pass equivalent lambda/4 line is equal to the optimal load impedance of the auxiliary power amplifier, and the characteristic impedance of the high-pass equivalent lambda/4 line is multiple times of the optimal load impedance of the auxiliary power amplifier. Via the Doherty power amplifier, the impedance conversion ratio of the Doherty power amplifier in a fallback region is reduced through the low-Q output network, and therefore the bandwidth is remarkably improved; moreover, the impedance conversion ratio of the saturation region is the same as that of the fallback region, and therefore the overall bandwidth is not limited. The improvement of the bandwidth is helpful for reducing the size and cost of communication equipment such as a mobile terminal, a base station and the like.

The invention relates to a planar coriolis millimeter wave, a terahertz power amplifier and a preparation method thereof, which sequentially comprises a substrate, a channel layer and a coplanar waveguide electrode from bottom to top. The carrier concentration of the channel layer is 1*1014 -1*1017 cm<3>. The length of the channel layer is 1-10 microns. The value range of the product N of the carrier concentration of the channel layer and the length of the channel layer is 1*1011 cm<2> < N < 1*1014 cm <2>. Accoridng to the invention, a coriolis power amplifier with a plane structure is designed, and the device has an obvious negative differential resistance effect. The power amplification from the microwave to the terahertz frequency can be realized. The invetion is beneficial to the application of a planar coriolis device as a microwave or terahertz amplifier in the fields of microwave and terahertz communication, radars, imaging and the like.

The invention provides an all direction open type sound box. The sound box comprises a base. A spherical shell comprising a vibrating diaphragm is fixed on the base. A left side surface and a right side surface of the spherical shell are symmetrically concave toward the direction of the center of the sphere, so as to form two sections of symmetrical horn pipes. The two sections of symmetrical horn pipes are mutually connected with each other in the spherical shell, so as to form a symmetrical horn pipe. A closing coil coaxial with the horn pipe is fixed on the surface of each section of horn pipe. The closing coil is distributed from the end of the horn pipe close to the center of the spherical shell to the end of the horn pipe close to the spherical surface of the spherical shell. A section of cylindrical electromagnet coaxial with the symmetrical horn pipe is fixed at the center of the interior of the symmetrical horn pipe. An exciting coil is wound on the surface of the electromagnet. The exciting coil is coupled on a power amplifier module and a power module arranged in the base. The all direction open type sound box has basically consistent auditory effect in all directions, and has high sound energy efficiency and large sound production power.

The invention discloses an anthropometric dummy for the performance test of a wearing type physiological signal detection device. The anthropometric dummy comprises a human structure model, a signal transmission device, a test signal generating device and an interaction and control device, wherein the signal transmission device comprises a surface structure layer, an impedance adjusting circuit and a metal electrode; the surface structure layer wraps the surface of the human structure model; the metal electrode is closely clung to the surface structure layer; the surface structure layer has conductive capacity; a signal output end of the test signal generating device is connected with a signal input end of the signal transmission device; the test signal generating device comprises a waveform generator and a power amplifier; a signal output end of the interaction device is connected with a signal input end of the test signal generating device; a man-machine interface for interaction is arranged. A human scale model is served as a carrier and the generation of various physiological electric signals on a human body surface is simulated, so that the anthropometric dummy can be used as a test carrier for a wearing type bio-electricity signal collecting device, the structure is simple and the operation is convenient.

The invention provides a storage battery high-efficiency formation incentive charge device which belongs to the technical field of electron. The invention solves the problems that the formation efficiency is low, the environmental pollution is caused easily, and the like. when the storage battery is produced currently. The storage battery high-efficiency formation incentive charge device is used for urging electrolyte in the storage battery; the device comprises a power amplifier circuit which is used for producing plus-minus pulse current and a power supply; a power amplifier driving circuit which is used for driving the power amplifier circuit to produce the plus-minus pulse current is connected between the power amplifier circuit and the anode of the power supply; the power amplifier circuit is connected with a rectifier circuit which is used for adjusting the width and the scope of the plus-minus pulse current produced by driving the power amplifier circuit; the output end of the rectifier circuit is connected with the storage battery. Through a charge container formation after the high frequency plus-minus pulse current is produced to pour the electrolyte into the storage battery assembled by a green plate, the device prolongs the service life of the storage battery, increases the storage battery capacity produced primarily and at the same time reduces the pollution emission.

The invention discloses a separately excited DC machine controller of an electric automobile. The separately excited DC machine controller comprises a heating panel and a shell, wherein an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) power amplifier board is arranged on the surface of the heating panel; a control circuit board is installed above the power amplifier board and is fixed on the shell, a driving circuit board is also arranged on the heating panel, a DC bus supporting capacitor, a relay, a junction busbar and a pre-electrification resistor are welded on the driving circuit board, and the MOSFET power amplifier board, the DC bus supporting capacitor and the relay are electrically connected through the junction busbar to form a high voltage circuit of the machine controller; an armature current Hall sensor is fixedly arranged on the driving circuit board; a binding post is arranged on the upper end of the shell, and a cable connector assembly used for connecting a whole vehicle signal wiring harness is also fixedly arranged on the shell. The separately excited DC machine controller is reasonable in internal structure layout, small in volume, light in weight, good in electromagnetic compatibility and capable of fully meeting the development requirements of light weight and high integration degree of electric automobiles on parts and components.

Provided is a multi-mode open-loop type clock extraction apparatus. In the apparatus, a power divider block divides an input data signal into two data signals. A first band-pass filter block and a second band-pass filter block extract a first clock frequency component or a second clock frequency component contained in the data signal output from the power divider. A first amplifier block and a second amplifier block amplify the first clock frequency component and the second clock frequency component respectively. Accordingly, it is possible to extract the respective clock signals corresponding to N data rates from the N data signals with various data rates using a single clock extraction apparatus.

The invention discloses handheld equipment, which comprises a GaN radio-frequency power amplifier, a battery unit, a battery management unit, a digital processing unit, a transmitter and an antenna, wherein the GaN radio-frequency power amplifier is connected with the transmitter, the antenna and the digital processing unit; the transmitter is connected with the digital processing unit; the battery unit comprises a plurality of batteries; the battery management unit is connected with the digital processing unit and the battery unit, has a first power supply channel, adjusts serial and parallel relationships of the batteries in the battery unit according to the power supply requirement of the GaN radio-frequency power amplifier under the control of the digital processing unit, and provides a voltage capable of dynamic change for the GaN radio-frequency power amplifier via the first power supply channel; and the digital processing unit is used for processing a communication signal, and controlling the battery management unit. The handheld equipment disclosed by the invention has the advantages of high transmitting chain bandwidth and efficiency, and small transmitting chain area.

In a method and a media system of/for generation of at least one output signal (H_PL,H_PR) from at least one input signal belonging to a second set of sound signals (M) having a related second set of Head Related Transfer Functions, in which the media system can be a TV, a CD player, a DVD player, a Radio, a display, an amplifier, a headphone or a VCR, the method includes the steps of determining, for each signal in the second set of sound signals, a weighted relation (14) including at least one signal belonging to a third set of intermediate sound signals (CHI1, CHI2) and at least one weight value (Weights); determining a first set of Head Related Transfer Functions (HRTFs) based on the second set of sound signals, the second set of Head Related Transfer Functions and the weighted relation; and transferring at least one signal belonging to the third set of intermediate sound signals by means of at least one HRTF belonging to said first set of Head Related Transfer Functions in order to generate at least one output signal belonging to said first set of sound signals. Hereby, in the end, fewer HRTFs are determined for a subsequent transfer of input signal(s) to output signal(s). Accordingly, few convolutions are required.

The embodiment of the invention discloses a de-emphasis type continuous-time linear equalizer architecture, and the architecture comprises an equalizer main circuit, a de-emphasis type continuous-time linear equalizer main circuit, a de-emphasis type continuous-time linear equalizer main circuit and a de-emphasis type continuous-time linear equalizer main circuit, wherein the equalizer main circuit is used for performing first equalization processing on a first differential signal input from the main input interface so as to output a second differential signal to the auxiliary output interface; a de-emphasis circuit which is connected with an auxiliary input interface and an auxiliary output interface of the equalizer main circuit, comprises a filter and an amplifier connected with the filter, and is used for performing second equalization processing on a second differential signal input by the auxiliary output interface so as to output a third differential signal to the auxiliary input interface; wherein the equalizer main circuit outputs a fourth differential signal from the main output interface based on the first differential signal and the third differential signal. The de-emphasis type continuous-time linear equalizer architecture disclosed by the invention can improve peaking capability and make up channel loss, and has the characteristic of low cost.

The invention discloses a new type property right surveying and mapping device, comprising a transmitter system and a receiver system. The transmitter system comprises a microphone input interface, a route input interface, an FM frequency modulation circuit, a radio frequency circuit, a transmitting antenna, a transmitter microcontroller, a transmitter power supply, a transmitter display and a transmitter keyboard. The microphone input interface, the route input interface, the radio frequency circuit and an FSK coding circuit are connected with the FM frequency modulation circuit. The receiver system comprises a receiving antenna, a radio frequency input circuit, an FM frequency modulation circuit, a power amplifier circuit, an earphone, an FSK decoding unit, a receiver power supply, a receiver microcontroller, a receiver display and a receiver keyboard. The receiving antenna, the radio frequency input circuit, the FM frequency modulation circuit, the power amplifier circuit and the earphone are connected in sequence. According to the device, wireless communication and data transmission are combined, the communication fluency is ensured when the surveying and mapping are carried out, a data record and transmission mode is changed, surveying and mapping workloads are mitigated, and the surveying and mapping accuracy is improved.

The invention discloses a method for fixing a chip of a power transistor. The method comprises the following steps of: selecting and checking a tube shell; measuring an inner cavity of the base, the chip mounting position and the electrode mounting position of the selected tube shell; selecting ceramics, carrying out cutting according to a measurement result of the inner cavity, and therefore forming a cylinder corresponding to the inner cavity; cutting the cylinder according to measurement results of the chip mounting position and the electrode mounting position; and mounting the cylinder subjected to secondary cutting into the inner cavity of the base of the tube shell, mounting an electrode at the electrode fixing position, and sintering a chip at the chip fixing position, thereby completing the fixation of the chip. According to the invention, the position of the chip during sintering can be fixed so as to improve the morphology after bonding, and the chip can be accurately bondedto a PAD area of the chip, thereby improving the bonding yield and reducing the manufacturing cost.

The invention discloses a high-voltage switchgear monitoring control circuit comprising a central processing unit, a temperature sensor, a data acquisition module, a data transmission module, an LED display module, an alarm module, and a wireless transmission module. The data transmission module comprises an infrared transmitting processing circuit, an infrared receiving processing module, an infrared transmitting diode, and an infrared receiving diode, wherein the infrared transmitting processing circuit is composed of a waveform generator, a phase inverter, a modulation circuit and an amplifier, and a voltage follower is arranged between the output signal of the infrared receiving processing module and the central processing unit. Acquisition of processed signals is more stable, and clutter can be effectively suppressed under external disturbance.

An oscillator circuit includes a resonator (SAW resonator), an amplifier circuit, and a switching element (NMOS switch). The amplifier circuit has a feedback path from one end to the other end of the resonator, a first inductance element (elongated coil) provided in the feedback path, and a variable capacitance element (variable capacitance diode) provided in the feedback path in series with the first inductance element. The switching element is provided in parallel to a circuit part including the first inductance element and the variable capacitance element.

The invention belongs to the technical field of optical fiber amplifiers and relates to a subminiature pure optical fiber amplifier. An input optical signal of the amplifier accesses to the input endof a two-in-one device through optical fibers with the diameter of about 250 [mu]m; the optical signal is focused by an input end lens inside the two-in-one device and is reversely focused by an output end lens in sequence; the optical signal accesses to the output end of the two-in-one device through optical fibers with the diameter of about 165 [mu]m; and is connected with the input end of an isolator through erbium-doped optical fibers with the diameter of about 165 [mu]m; the optical signal is focused by an input end lens inside the isolator and is reversely focused by an output end lens in sequence, accesses to the output end of the isolator through the optical fibers with the diameter of about 250 [mu]m and is outputted; and a pump laser is connected with the two-in-one device through the diameter of about 165 [mu]m. The two-in-one device, the isolator and the pump laser inside the optical fiber amplifier are connected by adopting the diameter of about 165 [mu]m, so that the space is saved and the overall dimension of the pure optical fiber amplifier is reduced.

The invention discloses a microelectrode amplifier. The microelectrode amplifier comprises a microelectrode input circuit, a sampling resistor, a signal follower, a first signal conditioning circuit,a second signal conditioning circuit, a third signal conditioning circuit, a fourth signal conditioning circuit, an adder, a first digital-to-analog conversion unit, a second digital-to-analog conversion unit, a third digital-to-analog conversion unit, an analog-to-digital conversion unit, a processor, a single-pole switch and an interface unit. The interface unit comprises a return-to-zero outputinterface used for outputting return-to-zero signals, an output interface used for outputting compensated signals, and a digital interface used for outputting pole resistance values. According to themicroelectrode amplifier, the invention is not only applied to a cell research, but also can be applied to an environmental detection, and the amplifier is small in size, low in cost, stable in performance, and is not limited to the precision of electronic devices, and a pole resistance measurement, a quick return-to-zero operation and a negative capacitance compensation can be realized.

The invention discloses a distance measuring device, which comprises a light source, a polarization controller, a first electro-optical modulator, a second electro-optical modulator, an optical circulator, a coupler, a 1/4 wave plate, a reflector, an analyzer, a photoelectric detector, a low-pass filter, a signal source, a first automatic gain amplifier, a second automatic gain amplifier and a measurement control unit. The invention further discloses a distance measuring method, which comprises the steps of outputting sinusoidal signals with the frequency changing continuously by using the signal source, controlling the first electro-optical modulator and the second electro-optical modulator to modulate the measurement light at the same time, and measuring demodulation waveform parametersto calculate the distance to be measured. The device is simple in structure and high in environmental adaptability, measurement errors caused by non-reciprocal and non-flat electrical characteristicsof the modulator can be effectively suppressed, and large-dynamic-range high-precision absolute distance measurement can be realized at the same time.