208 results about "Differential amplification" patented technology

The invention discloses a gas concentration detection circuit and method based on differential measurement and reference compensation, and the circuit comprises at least one active gas sensitive element, the electrical parameters of which change along with the concentration of a target gas; the sensitivity of the reference gas sensitive element to the target gas is at least lower than that of the active gas sensitive element by a preset percentage threshold value; the active gas sensitive element and the reference gas sensitive element are connected in a differential pair form to form a differential signal generation unit; the differential amplification circuit is used for amplifying the differential signal output by the differential signal generation unit; the output signal of the differential amplification circuit is used for representing the concentration information of the target gas. According to the invention, environmental interference and baseline drift are directly and effectively suppressed from the hardware level, the stability and selectivity of gas concentration measurement are improved, and meanwhile, the holding circuit is simple in structure, low in cost and convenient for large-scale application.

The invention discloses a seesaw type optical fiber end face weak force sensor which comprises a seven-core optical fiber, a seesaw type additive structure and an interference light beam. The seven-core optical fiber is composed of a central main fiber core and six symmetrically-distributed auxiliary fiber cores. The seesaw-type additive structure is composed of a short vertical beam, a vertical beam on a central main fiber core of the seven-core optical fiber and a cross beam connected to the vertical beam, and the whole structure is prepared through the two-photon polymerization technology of a femtosecond laser processing platform; the interference light beam is composed of two light beams in an interference cavity, wherein the lower surfaces of the left side and the right side of the seesaw-type additive structure are aligned with the end faces of two auxiliary fiber cores on the left side and the right side of the seven-core optical fiber. According to the invention, a two-photon polymerization technology is used to build an additive structure on the end face of the seven-core optical fiber, so that the sensing structure is small in overall size and is suitable for application in a limited space; the Fabry-Perot interferometers on the two sides of the sensing structure are connected in parallel to form an optical dynamic vernier structure, the sensitivity is improved through differential amplification of weak mechanical disturbance, and the anti-interference capability is enhanced through common-mode denoising.

A high-speed, low-noise laser signal detection apparatus, comprising a low-noise linear regulated power supply and a laser detection processing module. The low-noise linear regulated power supply (01-03) comprises an isolation unit (01), a voltage regulation and filtering unit (02), and a reference unit (03). The laser detection processing module (04-09) comprises a laser light signal detection input unit (05), a bias unit (04), a differential amplification unit (07), an active filtering unit (08), and an output interface unit (09). An output end of the voltage regulation and filtering unit (02) is connected to the reference unit (03) and the laser detection processing module (04-09). The reference unit (03) is connected to the bias unit (04) and is configured to provide a reference voltage to the bias unit (04). The bias unit (04) is configured to provide a bias voltage to the differential amplification unit (07). The differential amplification unit (07) comprises a multi-stage in-phase proportional differential amplification circuit, and the active filtering unit (08) comprises a multi-order active low-pass filter. According to the high-speed, low-noise laser signal detection apparatus, the detection bandwidth of a laser signal can be expanded, the signal-to-noise ratio of high-frequency pulse measurement can be reduced, and the anti-interference characteristics of a power supply can be improved.

The invention discloses a detection device and a detection system for harmonic oscillator capacitors of a hemispherical resonator gyroscope, and relates to the technical field of capacitor detection, the detection device comprises a signal detection circuit, a modulation compensation circuit, a differential amplification circuit and a control circuit, the signal detection circuit is connected with the output ends of the two harmonic oscillator capacitors; the modulation compensation circuit is correspondingly connected with two input ends of the signal detection circuit; the differential amplification circuit is correspondingly connected with two output ends of the signal detection circuit; the control circuit is configured to output modulation voltage to the two input ends of the modulation compensation circuit according to a voltage signal of the output end of the differential amplification circuit, and zero setting is carried out on voltage at the connecting positions of the two output ends of the modulation compensation circuit and the two input ends of the signal detection circuit. According to the invention, the modulation compensation circuit is adopted to enable the output ends of the two harmonic oscillator capacitors to work near zero voltage, the circuit has the characteristics of ultrahigh linearity, extremely low temperature drift, rapidness and stability, errors caused by power supply drift can be eliminated, and the detection precision is improved.

The invention provides an anti-interference pressure sensor signal conditioning circuit based on a differential amplification structure, and the circuit comprises a differential input module which is used for receiving a differential signal outputted by a pressure sensor, and carrying out the amplification and filtering of the outputted differential signal, and obtaining a first differential signal; the common-mode suppression module is electrically connected with the differential input module and is used for suppressing a common-mode signal in the first differential signal to obtain a second differential signal; the programmable gain amplification module is electrically connected with the common-mode suppression module and is used for performing programmable gain amplification on the second differential signal to obtain a third differential signal; the low-pass filtering module is electrically connected with the programmable gain amplification module and is used for filtering high-frequency noise in the third differential signal to obtain a fourth differential signal; and the output buffer module is electrically connected with the low-pass filtering module and is used for converting the fourth differential signal into a single-ended signal and outputting the single-ended signal. According to the invention, external electromagnetic interference and common-mode noise can be effectively suppressed, and the stability and accuracy of signal transmission are improved.

The invention provides a temperature drift compensation method, device and equipment for a Hall current sensor, and relates to the technical field of Hall sensors. The method is applied to a temperature excursion compensation system, the temperature excursion compensation system comprises a temperature sensor, a microprocessor, a temperature excursion prediction model, a compensation signal generation module and a differential amplification circuit, and the temperature excursion compensation method comprises the following steps: acquiring environment temperature data of a Hall current sensor by using the temperature sensor; the microprocessor calculates a temperature drift error parameter corresponding to the current environment temperature data based on the environment temperature data and a temperature drift prediction model; the compensation signal generation module generates a corresponding compensation signal based on the temperature drift error parameter, and the compensation signal and the temperature drift error represented by the temperature drift error parameter are equal in size and opposite in direction; and superposing the compensation signal and an original sampling signal of the Hall current sensor through a differential amplification circuit to obtain a final current signal. The measurement accuracy of the Hall current sensor can be improved.

The invention discloses a single-power-supply ultra-wideband temperature compensation low-noise amplifier circuit, and belongs to the technical field of radio frequency microwaves. The circuit is mainly composed of a pre-stage low-noise amplifier module, an inter-stage temperature compensation equalization module and a post-stage driving amplifier module. The temperature compensation equalizer module generates differential voltage related to temperature through a three-stage gallium arsenide diode temperature sensing unit, outputs a control signal through an enhanced FET differential amplification circuit, drives a voltage-controlled attenuation equalizer to dynamically adjust the attenuation amount of a radio frequency signal, and achieves gain stability in a frequency band. Through the collaborative design of a blocking capacitor and a divider resistor, the grid bias of an FET switch is strictly limited in a transconductance linear adjustment interval, and the interval covers 80% of the effective range of the threshold voltage of a gallium arsenide FET tube. The circuit is powered by a single power supply + 5V, stable work of each module is ensured through active bias and a power supply filter network, and the circuit is suitable for extreme temperature environments such as high-frequency communication and radar.

The invention relates to the technical field of photoelectric detection, and provides a single-photon counter circuit for weak light detection based on a photomultiplier, and the single-photon counter comprises a photoelectric conversion circuit, a differential amplification circuit, a threshold comparison circuit and a signal shaping circuit. The photoelectric conversion circuit is composed of a photomultiplier, a high-voltage power supply circuit and a voltage division circuit, detects weak light signals and outputs two paths of current signals through photoelectric conversion. The differential amplification circuit carries out differential amplification on the two current signals through a differential amplifier. The threshold comparison circuit compares two input signals, filters out signals with the amplitude lower than 1 / 2 of a set threshold, and outputs a single-path effective signal. And the signal shaping circuit shapes the effective signal and finally outputs the effective signal in a TTL pulse mode. According to the single photon counter circuit for weak light detection, the background dark counting rate is low, the sensitivity is high, and the counting unit module specially used for digital pulse statistics is connected behind the single photon counter circuit for counting single photons.

The embodiment of the invention discloses a non-blind area range resolution optimization laser wind measurement radar and a wind measurement method. The non-blind area range resolution optimization laser wind measurement radar comprises a seed laser; the beam splitter is used for splitting the single-frequency continuous light emitted by the seed laser into three paths: the short-distance detection emission unit is used for introducing a first path of laser and emitting the first path of laser to the atmosphere; the long-distance detection transmitting unit is used for introducing a second path of laser and transmitting the second path of laser to the main telescope; the main telescope is used for expanding the second path of laser and then emitting the second path of laser to the atmosphere, and is also used for receiving echo signals of the first path of laser and the second path of laser; the coherent beat frequency receiving light path processing unit is used for performing beat frequency amplification and differential amplification according to the received echo signals of the first path of laser and the second path of laser and the third path of laser and then converting the signals into electric signals; the processor is also used for carrying out range gate division and FFT processing on the electric signal according to a time sequence to obtain a frequency spectrum signal; and the inversion unit is used for inverting the wind speed data by using the frequency spectrum signal.

The invention provides a static frequency divider with adjustable self-resonant frequency and a clock circuit, and relates to the technical field of circuits, the frequency divider comprises a master latch and a slave latch; each of the master latch and the slave latch comprises a current source, an adjustable resistor unit, a differential amplification pair, a cross coupling pair and a load resistor pair; the current source is connected with the first current branch and the second current branch, the first current branch is connected with the load resistor pair through the differential amplification pair, the second current branch is connected with the load resistor pair through the cross coupling pair, the first current branch is provided with a first switching tube, and the second current branch is provided with a second switching tube and an adjustable resistor unit which are connected in series. Thus, the adjustable resistor unit is configured on the second current branch, association between the resistance value of the adjustable resistor unit and the frequency of the frequency divider is established, a hardware basis is provided for frequency adjustability, and frequency requirements of different scenes are met by adjusting the resistance value of the adjustable resistor unit and adjusting the self-resonant frequency of the frequency divider.

This invention provides a dual-end driven long shaft system multi-order torsional vibration test platform and a torsional vibration identification and suppression method, relating to the field of long shaft system variable frequency drive technology. The platform includes two dual-winding drive motors respectively located at both ends of the shaft system, a load motor located in the middle, and a switchable shaft system connection structure, along with a dual-master, dual-slave cooperative control system composed of four drive frequency converters. This method achieves controllable excitation of multi-order torsional vibration by superimposing the load torque step and the frequency excitation source. It utilizes differential amplification and dual-channel filtering in the signal processing module to extract speed fluctuation characteristics, accurately identifying the critical speeds of each order in the system. For the identified torsional vibration phenomenon, a speed differential negative feedback algorithm is used to correct the torque command of the frequency converter, and the torsional vibration energy of the elastic transmission chain is offset by actively enhancing the system's electrical damping. This invention solves the problem of reproducing complex torsional vibration under safe and controllable conditions and verifying suppression strategies in ultra-large generator units.

The invention discloses a printer motor control method and system based on a current detection front-end conditioning circuit, and relates to the technical field of current detection, and the current detection front-end conditioning circuit comprises a precise sampling resistor and a multi-stage RC filter network; the method comprises the following steps: collecting a motor phase current signal through a current detection front-end conditioning circuit, and converting the motor phase current signal into a digital current signal after differential amplification and filtering; obtaining a direct-axis current component and a quadrature-axis current component through coordinate transformation; setting a reference quadrature-axis current, and setting a direct-axis current reference value as 0; calculating a direct-axis voltage and a quadrature-axis voltage, and generating a switching signal for driving an inverter; in each control period, performing median filtering on the current sampling signal to adjust the integral gain of the PI controller; and identifying the abnormal state of the motor based on the time domain characteristics of the digital current signal so as to adjust the operation strategy of the 3D printer. High-precision current sensing and abnormal state recognition are both considered, and the printing quality of the 3D printer is improved.

The invention discloses a tumor detection device and method based on a diamond quantum sensor, and belongs to the technical field of biomedical detection. The device comprises an optical fiber laser, an optical fiber beam splitter, an optical fiber attenuator, an optical fiber circulator, an optical filter, two photoelectric detectors, a differential amplifier, an electronic filter, a computer, a signal generator, two microwave antennas and an optical fiber probe. The optical fiber probe comprises an optical fiber packaged in a plastic shell, a diamond quantum sensor which is fixed at the tail end of the optical fiber and comprises an NV color center, and a first microwave antenna integrated beside the optical fiber. The laser excites the diamond to generate fluorescence, meanwhile, the signal generator drives the two microwave antennas to apply a microwave field, and the dielectric property of the sample to be detected modulates the fluorescence intensity of the diamond by influencing the microwave field. Laser noise is eliminated through a differential amplification and filtering technology, and fluorescence signal change is analyzed by a computer, so that dielectric constant distribution of a sample is reconstructed, and non-invasive and high-sensitivity detection of tumors is realized.

The invention discloses a high-temperature dynamic strain test system and method, and relates to the technical field of high-temperature vibration test and strain measurement, and the system comprises a high-temperature loading measurement unit, a signal extension shielding line and a signal conditioning unit. The high-temperature loading measurement unit comprises a high-temperature strain measurement sheet and a compensation sheet which are respectively adhered to the tested piece and the accompanying test piece, and the high-temperature strain measurement sheet and the compensation sheet are in common-ground connection through a shielding layer by adopting a five-wire wiring method; the signal conditioning unit adopts a symmetrically-arranged double constant current source power supply and differential amplification structure, so that sensitivity deviation and common-mode noise interference caused by lead resistance change are effectively inhibited; according to the method, the maximum strain point is accurately positioned through the combination of finite element simulation and test, a dynamic resistance signal is directly converted by adopting constant-current excitation, and accurate acquisition of a strain signal in a high-temperature vibration environment is realized. According to the invention, the problems of obvious lead resistance influence and insufficient noise suppression capability in traditional measurement are solved, and high-precision and high-reliability measurement of dynamic strain of high-temperature parts such as aero-engine blades is realized.

The utility model relates to a battery-powered intelligent differential pressure flowmeter, which comprises a microcontroller M261, and a power supply module, an LCD (liquid crystal display) display module, a key input module, a communication module and a sensor module which are respectively connected with the microcontroller M261, the power supply module comprises two switchable power supply modes, namely an external photovoltaic voltage input mode and a built-in lithium battery mode, and a power supply stably outputs voltage for the microcontroller M261 to use through a low dropout regulator LDO; the sensor module comprises a differential pressure sensor, a compensation pressure sensor, a flow medium compensation temperature sensor and an NTC sensor. The differential pressure sensor, the compensation pressure sensor and the flow medium compensation temperature sensor are connected with differential amplification circuits respectively, the three differential amplification circuits are connected with the microcontroller M261 through the analog-to-digital converter, and the NTC sensor is connected with the microcontroller M261 through the analog-to-digital converter. Two power supply modes are supported, flexible use is facilitated, the power consumption of the whole machine is effectively reduced due to the circuit design, and the working time of the battery is prolonged.

The invention discloses a circuit for simplifying electroencephalogram signal detection, amplification and transmission, and relates to the technical field of electroencephalogram signal acquisition. Comprising a distributed JFET signal amplification module, a differential amplification and common-mode recovery module and a differential-to-single-ended module. The distributed JFET signal amplification module directly amplifies weak electroencephalogram signals at an electroencephalogram signal acquisition point, and noise is reduced and measurement errors caused by Vos are eliminated through cooperation of a JFET tube and an operational amplifier in combination with a reference current source and a zero setting circuit; the differential amplification and common-mode recovery module further amplifies the amplified differential signal and recovers a common-mode signal, so that the influence of the input current on a pre-stage circuit is reduced; the differential-to-single-ended module converts the differential signal into a single-ended signal and couples the single-ended signal to a specified common-mode voltage, so that ADC acquisition is facilitated. Interference in the electroencephalogram signal transmission process is effectively reduced, the authenticity and accuracy of signal collection are improved, complex digital bus control is not needed, the number of connecting lines is reduced, and connection between point locations is simplified.

The application provides a metal film thickness measurement method and device for tungsten gate chemical mechanical polishing, comprising a sensor probe, a power module, a signal excitation module, a differential amplification module, a synchronous demodulation module, a data acquisition and processing module; the sensor probe comprises coaxially arranged excitation coils, detection coils and balance coils; the signal excitation module drives the three-coil resonance module to induce eddy current effect at the metal film to be measured; the differential amplification module converts the equivalent impedance change caused by the eddy current effect in the coils into a differential signal, and simultaneously improves the dynamic range through low-noise amplification; subsequently, the synchronous demodulation module multiplies the differential signal with a reference signal, and extracts a direct current component proportional to the signal amplitude through a low-pass filter; the obtained voltage amplitude signal is input into the data acquisition and processing module; the application can significantly amplify the weak signal related to the film thickness, effectively suppress common-mode noise, obtain nanometer-level thickness resolution, and has a high signal-to-noise ratio.

This application relates to the field of microphone technology, and discloses a differential amplifier circuit and a desktop microphone. The circuit is used to amplify and process the differential audio signal of the desktop microphone. Its features include an input signal receiving and DC bias module, a differential transistor amplifier module, a fully differential operational amplifier module, a cross-feedback network module, a power supply and reference voltage module, and an output signal processing module connected in sequence. A common-mode negative feedback network for suppressing common-mode signals is provided between the emitters of the two corresponding symmetrical amplification paths of the differential transistor amplifier module. A cross-feedback network module is provided between the differential output terminal and the differential input terminal of the fully differential operational amplifier module to form an AC differential negative feedback loop. The power supply and reference voltage module includes at least two reference voltage units, which respectively provide DC bias for the differential transistor amplifier module and set the output common-mode level for the fully differential operational amplifier module.

The invention relates to the technical field of circuits, in particular to a rapid zero-crossing detection circuit and a rapid zero-crossing detection method.The rapid zero-crossing detection circuit comprises a sampling detection circuit, a differential amplification assembly, a comparison assembly and a Schmitt trigger, and the sampling detection circuit is used for obtaining the voltage of a switch output node and the voltage of a power ground node; the differential amplification component is used for respectively amplifying the voltage of the switch output node and the voltage of the power ground node to obtain the amplified voltage of the switch output node and the amplified voltage of the power ground node; the comparison component is used for outputting a zero-crossing signal when the amplified voltage of the switch output node and the amplified voltage of the power ground node meet a preset zero-crossing condition; and the Schmitt trigger is used for outputting a zero-crossing detection result according to the zero-crossing signal comparison assembly, so that the problem that a switch tube has a risk of being broken down due to too slow detection of a zero-crossing detection circuit in related technologies is solved, and the safety of circuit elements and the response speed of the zero-crossing detection circuit are improved.

The invention provides a clock duty ratio calibration circuit and device applied to a high-speed interconnection parallel port. A duty ratio adjustment module is used for receiving an input clock signal and adjusting the duty ratio of the input clock signal according to a feedback signal; the single-ended to differential module is used for converting the adjusted clock signals into differential clock signals with opposite phases; the narrow-band low-pass filter is used for extracting a direct-current level component of the differential clock signal and outputting a filtering signal; the fully differential dynamic amplifier is used for carrying out differential amplification on the filtered signal and outputting an amplified signal; the integrating capacitor module is used for integrating the amplified signal to obtain an integral voltage; the comparator is used for comparing the first integral voltage with the second integral voltage and outputting a comparison result; and the feedback path is used for connecting the output end of the comparator to the feedback input end of the duty ratio adjusting module to form a closed-loop control loop, so that the duty ratio of the input clock signal is gradually converged to the target duty ratio.

The application discloses a parallel optical fiber amplifier channel equalization system based on signal power adaptive grading, and is characterized in that: the system further comprises a power detection and grading module arranged in front of the parallel amplifier and used for detecting the input optical signal in real time and dividing the optical signal into several power grades based on a preset or adaptive threshold, and a signal distribution and merging module used for guiding the optical signals of different power grades divided to corresponding parallel amplifier paths and merging the optical signals output by each path after the parallel amplifier completes amplification processing to realize channel power equalization; through power grading and differential amplification, the application reduces the difference value of the output power of each channel, realizes intelligent equalization of multi-channel optical signals, improves system gain flatness, effectively reduces the bit error rate caused by power imbalance, avoids the problems of gain saturation of high-power signals and insufficient gain of low-power signals, and improves channel capacity.

The invention discloses a differential velocity measurement sensor and application thereof. The differential velocity measurement sensor comprises a first probe and a second probe which are installed in the same detection area. The high and low levels of the first probe output voltage signal and the second probe output voltage signal are opposite; wherein when the voltage signal output by the first probe is at a high level, the voltage signal output by the second probe is at a low level; when the voltage signal output by the first probe is low level, the voltage signal output by the second probe is high level; the output end of the first probe and the signal output end of the second probe are respectively connected to a differential signal processing circuit, and the differential signal processing circuit carries out differential amplification processing on an inverse phase differential signal formed between an output voltage signal of the first probe and an output voltage signal of the second probe to form a square wave pulse signal for output; according to the invention, the influence of common-mode interference can be effectively eliminated, only real useful pulse signals are reserved, and the measurement precision and reliability are improved.

The invention discloses a motor speed measurement method and a motor speed measurement device. The motor speed measurement device comprises at least two groups of magnetic field induction assemblies; the magnetic field induction assembly comprises at least one Hall element group; the Hall element group comprises a first Hall element which is installed in the forward direction and a second Hall element which is installed in the reverse direction. The first Hall element is used for outputting a first measurement waveform; the second Hall element is used for outputting a second measurement waveform; the differential amplification modules are arranged in one-to-one correspondence with the magnetic field induction assemblies; the differential amplification module is used for outputting a first differential amplification signal according to the first measurement waveform and the second measurement waveform; the shaping module is used for shaping the first differential amplification signal into a pulse square wave signal; and the control module is electrically connected with the shaping module and is used for acquiring the rotating speed and the rotating direction of the motor according to the at least two pulse square wave signals. According to the technical scheme provided by the invention, a simpler and more accurate speed measurement mode is provided.

The application is suitable for the field of energy storage power supply technology improvement, and provides a control circuit and method for high-speed switching of bidirectional DCDC power supply charging and discharging, which acquires the output current of the bidirectional DCDC power supply in real time through an output positive and negative current sampling detection circuit and converts the output current into a differential voltage signal; an output current detection comparison circuit compares the signal and outputs a high / low level signal corresponding to the current direction; a master control unit digital control processor DSC1 controls the power supply to switch between the discharging and charging states immediately according to the jump of the level signal. The application uses simple differential amplification and high-speed comparison circuit to realize microsecond-level fast charging and discharging state following, solves the switching delay problem caused by the dependence of the prior art on communication or voltage loop, and has the advantages of fast response speed, high reliability, low cost, and wide application scenarios.

The utility model provides a temperature sampling circuit, and relates to the technical field of temperature sampling. As the temperature sampling resistor is connected in series with the first resistor, one end of the formed series branch is connected with the first power supply, and the other end is grounded, and the second resistor is connected in series with the third resistor, one end of the formed series branch is connected with the first power supply, and the other end is grounded. The temperature sampling circuit, the first resistor, the second resistor and the third resistor form a bridge voltage division circuit, so that the formed bridge voltage division circuit provides differential voltage for the differential amplification circuit, and the differential amplification circuit can be used for differential amplification. Therefore, the same parts in the two output signals forming the bridge voltage division circuit can be counteracted to a certain extent, namely, a part of errors can be counteracted, and the sampling precision of the temperature sampling circuit is further improved. Therefore, if the temperature sampling circuit is used as a temperature monitoring device of the motor, namely temperature sampling is carried out on the motor, the sampling precision of the temperature of the motor is improved.

The invention discloses a W-band high-backoff-efficiency power amplifier adopting a power synthesis technology, and relates to the technical field of millimeter wave integrated circuits, and the power amplifier comprises a power distribution network, a differential driving stage, an inter-stage matching network, a differential output stage, an active load modulation network and a self-adaptive bias network. A radio frequency input signal is divided into two paths of signals which are equal in amplitude and have a phase difference of 90 degrees through the power distribution network, and after the two paths of signals are subjected to differential amplification through the main path and the auxiliary path respectively, in-phase power synthesis output is completed through the active load modulation network. A self-adaptive bias network is introduced for an auxiliary circuit amplifier, a radio frequency input signal is accessed to the input end of the self-adaptive bias network, and auxiliary circuit bias is dynamically adjusted according to the size of input power: an auxiliary circuit is closed or slightly opened when the signal is small, and is completely opened when the signal is large, so that high linearity and high power additional efficiency are simultaneously realized in a wide power range. The power amplifier disclosed by the invention still keeps high efficiency in a backoff region, and is suitable for 5.5 G / 6G communication, radar and imaging systems.

The invention relates to a dynamic frequency change tracking live detection device, which belongs to the technical field of power system experiments and comprises a main control module, a double-differential electric field coupling module, an ultrahigh-resistance steady-state acquisition module, a differential amplification and signal conditioning module and a steady-state judgment module. The double-differential electric field coupling module is used for forming more than two groups of coupling potential signals with different spatial positions under the action of an electrostatic field in the space around the measured conductor; the ultrahigh-resistance steady-state acquisition module is connected with the double-differential electric field coupling module; the differential amplification and signal conditioning module is connected with the ultrahigh-resistance steady-state acquisition module; and the steady state discrimination module is connected with the differential amplification and signal conditioning module. According to the invention, the ultrahigh-resistance steady-state maintaining structure is introduced into the electric field coupling end to suppress the discharge of the coupling charge, so that the coupling potential formed by the space electrostatic field under the ultralow-frequency and quasi-static conditions can stably exist, and the reliable identification of the direct-current and ultralow-frequency charged state is realized.

A power amplifier comprises: a first differential amplification unit, which includes an 11th voltage amplification unit that amplifies the voltage of a positive input power signal; an 11th broadband filter that feeds back a signal in a band of 8 to 16 GHz from the positive power signal to the 11th voltage amplification unit; a 12th voltage amplification unit that amplifies the voltage of a negative input power signal; and a 12th broadband filter that feeds back a signal in a band of 8 to 16 GHz from the negative power signal to the 12th voltage amplification unit; a transmission unit that transmits the two power signals to a subsequent stage; a second differential amplification unit, which includes a 21st power amplification unit that increases the power of the amplified positive power signal; and a 21st...The device comprises a broadband filter that feeds back a signal in a band of 8 to 16 GHz from the positive power signal to the 21st power amplification unit, a 22nd power amplification unit that amplifies the power of the amplified negative power signal, and an output unit that integrates an amplified positive power signal and an amplified negative power signal into a single signal for output.

The application discloses a real-time detection circuit and method for a voltage reduction circuit, and relates to the technical field of power supplies.The real-time detection circuit for the voltage reduction circuit comprises a voltage reduction module, a logic control module, a voltage sampling module, a differential amplification module, a digital-analog conversion module and a storage module.The application can monitor the output voltage in a starting state in real time without damaging a mainboard PCB and without destroying the whole system, so as to timely analyze and locate the power consumption of a later-stage chip, and the output current in the starting state can be obtained through calculation based on the voltage of the monitoring sampling port position, the current size can be detected without lifting one end of the inductor, the mainboard PCB and electronic components are not damaged, and the operation is convenient;the power supply current size of a certain component or chip can be detected remotely without disassembling the machine, and the application has good operability;the application can be monitored in real time, and has good timeliness.