665 results about "Differential amplifier" patented technology

The invention discloses a noise elimination circuit structure, a low noise amplifier, a chip and electronic equipment. The noise elimination circuit structure comprises an input matching network; a common source stage amplification path connected with the first differential output end of the input matching network, comprising a first common source stage differential amplifier, and outputting an amplified first signal inverted from the radio frequency input signal to the ground; the common-gate amplification path is connected with the second differential output end of the input matching network, comprises a first common-gate differential amplifier and outputs an amplified second signal which is opposite to the radio frequency input signal to the ground; and the output end of the common-source amplification path and the output end of the common-gate amplification path are connected in parallel to form the output end of the noise elimination circuit structure. The common-source amplification path and the common-gate amplification path required by the noise elimination structure are realized by using one amplifier path, the utilization rate of the layout area is improved, the compactness of the layout is realized, and the amplifier can be widely applied to the field of communication or radar.

A Rydberg atom television receiver is disclosed. The receiver comprises a probe laser, a source polarizing beam displacer, a Rydberg atom receiver cell, receiver atoms, a detector polarizing beam displacer, a detector polarizing beam cube, a first photodiode, a second photodiode, a differential amplifier, a display, and a coupling laser. The receiver receives a modulated waveform imprinted on a radiofrequency carrier a displays a graphical representation corresponding to a modulation source.

The invention discloses a sensor array acquisition system for detecting gas, and relates to the field of gas sensors. The sensor array acquisition system for detecting gas comprises a gas sensor array, a signal conditioning circuit, an analog-to-digital conversion module, a control module and a power supply module. According to the sensor array acquisition system for detecting the gas, the voltage follower circuit with high input impedance is adopted, so that the problem of attenuation during signal acquisition of a high-impedance sensor is effectively solved, and the signal acquisition precision is improved. Through the adjustable direct-current bias circuit and the differential amplification circuit, the dynamic adjustment of the measurement range is realized, the gas detection requirements of different concentration ranges can be met, and hardware does not need to be replaced. A constant-current driving chip is adopted to control a sensor heating circuit, heating current can be accurately set by adjusting external resistance, it is ensured that the sensor works at the optimal temperature, and the stability and response speed of the sensor are improved.

A monitoring device is provided. The monitoring device comprises one or more circuitry operable to obtain measurements of one or more pins of a battery system, the one or more circuitry comprising at least one circuit for monitoring current, which comprise: at least one other circuit for amplifying variance comprising at least one differential amplifier, one voltage reference in electrical connection with a first input of the differential amplifier; at least one transconductance means comprising at least one output in electrical connection with a second input of the differential amplifier and at least one input in electrical connection with an output of the differential amplifier; at least one current source in electrical connection with at least one output of the at least one transconductance means; and an output in electrical connection with at least one output of the at least one transconductance means.

The invention relates to the technical field of signal processing, in particular to a microseismic sensor front-end signal conditioning circuit based on lag correction frequency expansion. The microseismic sensor front-end signal conditioning circuit based on lag correction frequency broadening comprises a differential amplification circuit used for converting a differential signal input by a microseismic sensor into a single-ended vibration signal and carrying out pre-amplification processing on the vibration signal according to a preset gain to obtain an amplified vibration signal; and the filtering and lag correction circuit is used for widening the frequency range of the amplified vibration signal in a filtering and lag correction mode to obtain a conditioned vibration signal. According to the invention, frequency expansion can be carried out on the magnetoelectric sensor through a low-frequency compensation technology, and the response capability of the magnetoelectric sensor to a low-frequency signal is improved.

The invention discloses an automatic temperature compensation circuit and method based on a thermal flowmeter, and relates to the technical field of temperature compensation, and the compensation circuit comprises a constant current source module used for driving the thermal flowmeter; the Wheatstone virtual bridge arm is used for acquiring a changed digital-to-analog converter output voltage value output by the controller, and performing voltage conversion on a first voltage and a second voltage which are output on the thermal flowmeter due to the change of the external temperature according to the output voltage value to obtain a third voltage; the digital-to-analog converter is used for performing correction compensation on the third voltage according to the correction compensation value calculated by the controller; and the differential amplification module adopts a differential amplifier to amplify the third voltage and the fourth voltage output by the thermal flowmeter, and outputs a compensated flow signal. The compensating circuit is simple in structure and higher in reliability and precision, and compared with a digital potentiometer, the output value of the Wheatstone virtual bridge arm is changed by using the output value of the digital-to-analog converter, so that the adjusting resolution is higher.

The invention relates to the technical field of electric field detection and early warning. The invention aims to overcome the defect of lack of an electric field detection device under the hot-line working condition of an ultra-high-voltage line in the prior art, and relates to an electric field detection device under the hot-line working condition of the ultra-high-voltage line, which is a non-contact electric field detection device and is used for detecting the electric field under the hot-line working condition of the ultra-high-voltage line in the hot-line working condition of the ultra-high-voltage line. The non-contact electric field detection device takes a microprocessor as a core control unit, and is composed of a double-spherical-shell type electric field sensor, a differential amplifier, a filter circuit, a true RMS conversion circuit, a power supply module and a man-machine interaction circuit. And deep association of data support, function collaboration and scene adaptation is carried out through the structure. The problem that traditional equipment is insufficient in stability in a severe environment is solved, continuous and stable operation of the electric field detection equipment under complex working conditions is achieved, it is ensured that reliable electric field intensity data can be continuously output, and a basic guarantee is provided for operation safety evaluation.

The ultralow frequency sensor comprises a vibration detection unit, a power supply voltage stabilization unit and a signal conditioning unit, the power supply voltage stabilization unit is provided with a low dropout linear voltage regulator U20, a voltage converter U19 and a negative voltage regulator U21, and the low dropout linear voltage regulator U20 stabilizes an external power supply as a positive power supply VCC; the voltage converter U19 is used for converting positive voltage of an external power supply into negative voltage and outputting stable negative power supply VEE through the negative voltage stabilizer; the positive power supply VCC and the negative power supply VEE supply power to the signal conditioning unit; the signal conditioning unit comprises a high common mode rejection differential amplifier, a differential-to-single-ended amplifier, a band-pass filter and a differential output driver, a differential signal output by the vibration detection unit sequentially passes through the high common mode rejection differential amplifier, the differential-to-single-ended amplifier, the band-pass filter and the differential output driver, and then a differential voltage signal is output; the method has the advantages of high stability and reliability and the like.

The invention relates to an active antenna comprising a single-turn loop, for example an antenna for radio communications and / or electromagnetic field measurements. An active antenna according to the invention comprises: a first element (11), the first element being an electrical conductor; a second element (12), the second element being an electrical conductor; a third element (3), the third element being an electrical conductor, a first end of the third element being directly coupled to a first end of the first element and to a first end of the second element; and a differential amplifier having a positive input terminal coupled to a second end of the first element, a negative input terminal coupled to a second end of the second element, and a reference node coupled to a second end of the third element, an output port of the active antenna being coupled to an output of the differential amplifier.Figure for abstract: Figure 4.

A monitoring device is provided. The monitoring device comprises one or more circuits operable to obtain measurements of one or more pins of a battery system, the one or more circuits comprising at least one circuit for monitoring current, the at least one circuit comprising at least one differential amplifier, at least one other circuit for amplifying a variance, comprising one voltage reference electrically connected to a first input of the differential amplifier, at least one output electrically connected to a second input of the differential amplifier, and at least one transconductance means comprising at least one input electrically connected to an output of the differential amplifier, at least one current source electrically connected to at least one output of the at least one transconductance means, and an output electrically connected to at least one output of the at least one transconductance means.

The embodiment of the invention provides an analog front-end circuit, and relates to the field of communication. Specifically, the analog front-end circuit comprises a plurality of differential amplification branches which are respectively provided with a switch; the control module is used for controlling on-off of the switch based on a communication protocol; wherein communication protocols of different differential amplification branches are different, the communication protocols are obtained based on a digital processing system, and the plurality of differential amplification branches are connected with the digital processing system. The problem that an analog front-end circuit in the related technology is poor in adaptability to a protocol is solved, and the effect of improving the adaptability of the analog front-end circuit to the protocol is achieved.

Provided is a differential amplifier comprising: a first differential amplification circuit that has a first input terminal, a second input terminal, a first output terminal and a second output terminal which respectively output a first output signal and a second output signal; an RC filter that filters the first output signal and the second output signal and outputs them; a second differential amplification circuit that has a third input terminal and a fourth input terminal to which the first output signal and the second output signal filtered by the RC filter are respectively input and a third output terminal which outputs a third output signal; and a third amplification circuit that has a fifth input terminal to which the third output signal is input and a fourth output terminal which outputs a fourth output signal according to the third output signal.

The invention relates to the technical field of aero-engine state monitoring, and discloses an aero-engine blade tip gap measuring probe and system based on an eddy current method.The aero-engine blade tip gap measuring probe adopts a coplanar Archimedes spiral double-coil array, and in the measuring process, the blade tip gap can be measured by applying anti-phase excitation; the common-mode noise suppression in the blade tip clearance measurement process is realized by combining a differential amplification circuit; signal extraction and temperature drift compensation are realized through a phase-locked amplification technology and an impedance-resistance orthogonal decoupling architecture, and finally micron-order gap analysis is realized. The aero-engine blade tip clearance measurement system provided by the invention can still keep excellent reliability under extreme working conditions of high temperature, high rotating speed and the like of a turbine, and meanwhile, the measurement precision of the blade tip clearance can be remarkably improved.

A fully differential switched capacitor amplifier receives a differential analog signal from a differential input terminal, amplifies the differential analog signal, and outputs an amplified signal from a differential output terminal. The fully differential switched capacitor amplifier includes: a sampling capacitor that respectively samples the differential analog signal input from the differential input terminal; a differential input switch connected to a path for inputting the differential analog signal between the differential input terminal and the sampling capacitor; a fully differential amplifier that amplifies the differential analog signal input to the sampling capacitor; and a differential input resistor connected between the differential input switch and the sampling capacitor.

The present invention discloses a photoacoustic spectroscopy gas detection device and method based on a differential diffuse reflection integrating sphere. The modulated laser output by a distributed feedback semiconductor laser is incident into the first diffuse reflection sphere of a differential diffuse reflection spherical resonance photoacoustic cell after passing through a laser collimator. After the target gas to be measured absorbs the laser energy, it causes the differential diffuse reflection spherical resonance photoacoustic cell to vibrate, and photoacoustic signals are generated in the first diffuse reflection sphere and the second diffuse reflection sphere. A first microphone and a second microphone are used to respectively detect the two-way photoacoustic signals in the first diffuse reflection sphere and the second diffuse reflection sphere, and the two detected photoacoustic signals are transmitted to a differential amplifier for differential operation. A control and data acquisition system collects the photoacoustic signals after differential operation and processes them by a computer to invert the concentration of the target gas to be measured. The detection device of the present invention has the advantages of large signal intensity, strong noise suppression ability, high system sensitivity, optical path free of adjustment, and small volume.

The invention relates to the technical field of switching power supply, and discloses a switching power supply constant-current protection circuit and a protection method thereof.The switching power supply constant-current protection circuit comprises an environmental parameter sensing module which collects current signals of a constant-current output loop through a shunt resistor and a differential amplifier, collects input voltage through a resistance voltage-dividing network and collects temperature through a thermistor; the dynamic threshold value generation module is used for receiving the current signal and the environment parameter and generating a dynamic current protection threshold value to maintain constant current output; the AI prediction protection module is used for sampling current signals, extracting high-frequency energy characteristics through frequency domain analysis and comparing the high-frequency energy characteristics with a dynamic current protection threshold value; a digital twin monitoring module; and a protection execution module. Temperature parameters are collected in real time, polynomial fitting calculation is executed, the nonlinear characteristic of a thermistor is converted into a linear compensation coefficient, a protection threshold value is dynamically generated in combination with a current effective value and input voltage fluctuation, and self-adaptive drift compensation of a constant-current protection point in a full temperature range is achieved.

A novel differential amplifier with a feedforward bias correction circuit, and a device. Common-mode voltage output of a differential amplifier is dynamically adjusted based on an input voltage by using a bias correction circuit. This can greatly reduce an input voltage error of the differential amplifier caused by an offset of the common-mode voltage output, so that a quite small input signal can be detected at high precision, assisting a common-mode regulation channel in tracking the common-mode voltage output, thereby reducing the offset of the common-mode voltage output and improving accuracy of the differential amplifier.

A dual-T network configured as a three-port combiner provides signal paths from two input ports to an output port, with near 0° insertion phase along one path, near ±90° insertion path along the other path, and impedance step-up along both paths. Disclosed combiners provide superior loss and impedance matching characteristics over wide (15%) bandwidth, and are suitable for use in Doherty amplifiers, which can provide high efficiency over about 10 dB output power levels, the power levels being adjusted dynamically or under switched control. Single-ended and differential Doherty amplifiers are disclosed. The combiners and Doherty amplifiers are suitable for mobile phones and other modern RF products, including battery powered products. The combiners can also serve as general-purpose quadrature couplers. Variations and performance graphs are presented.

The present invention relates to a miniaturized spaceborne high-energy particle detection device and method based on a silicon detector module. The detection device comprises a silicon detector module, a trigger circuit, a differential amplifier circuit, an ADC sampling circuit, an FPGA processor, a data storage unit, a data communication interface, a power conversion circuit, and a sensor bias circuit. The silicon detector module comprises a silicon semiconductor detector and a front-end preprocessing circuit arranged on the same printed circuit board. The silicon semiconductor detector converts received space charged particles into charge signals reflecting particle deposition energy, and the front-end preprocessing circuit converts the charge signals into fast and slow forming pulse signals. The trigger converts the fast forming pulse signal into a trigger signal. The differential amplifier converts the slow forming pulse signal into a differential signal. The ADC collector converts the differential signal output by the differential amplifier into a digital signal. The FPGA processor processes the digital signal output by the ADC collector and converts it into space particle energy spectrum and flux information.

The invention relates to the technical field of detection circuits suitable for various electricity utilization information acquisition terminals, and discloses a detection circuit method suitable for various electricity utilization information acquisition terminals. The method comprises the following steps: setting an environment temperature, calibrating a shunt resistor and a thermistor, constructing a three-order resistance-temperature mapping relation, and calculating thermal resistance and thermal response characteristics to realize accurate modeling; a thermistor is attached to a shunt resistor, heat-conducting silicone grease is added to form a thermal coupling structure, voltage is collected through a constant current source and a differential amplifier, a resistance value is converted into temperature in real time, instantaneous current is inversely calculated based on a heat balance equation, then energy integration and grade judgment is completed, and various electrical parameter indexes are output. According to the method, modeling, collection, conversion and inversion processes are integrated, a complete thermal-electric detection link is constructed, a traditional current sensor is not needed, and the method has the advantages of being compact in structure, low in cost, flexible in deployment and the like and is suitable for a low-power-consumption distributed terminal.

The invention relates to the technical field of motor driving, and discloses a motor driving circuit system of a high-speed air duct, which comprises a motor driving circuit composed of three half-bridge driving chips, and each chip is integrated with two high-voltage MOSFETs and a high-voltage grid driver to form a three-phase full-bridge driving topology; the current detection circuit comprises a single sampling resistor and a differential amplification circuit and is used for acquiring a motor phase current signal; the overcurrent comparison circuit comprises a high-speed comparator; a master control circuit; a back electromotive force detection circuit; an EMC filtering and power supply circuit; and a voltage detection circuit. High integration of a driving circuit is realized through a built-in half-bridge chip packaged by double MOSFETs and a driver QFN77, each chip integrates a temperature detection function and forms a three-phase full-bridge topology, the area of a PCB is reduced, the complete driving protection function is reserved, meanwhile, the layout complexity is remarkably reduced, and the requirements of portable equipment for compact space and low cost are met.

Circuits and methods are provided that more effectively and efficiently implement multi-level converter circuits, including circuits and methods that more effectively and efficiently transform a differential voltage in an upper voltage domain to a level-shifted differential voltage in a lower voltage domain. First and second signals are applied to a differential amplifier in the upper voltage domain to provide a pair of amplified voltages representing a differential amplified voltage. First and second level shifters are provided for translating each of the pair of amplified voltages to first and second output voltages, respectively, relative to a reference potential. The first and second output voltages collectively correspond to a differential level-shifted output voltage relative to the reference potential. The differential level-shifted output voltage may be applied to a fully-differential analog to digital converter.

The invention provides a ClassAB output stage control and compensation circuit, which relates to the technical field of analog integrated circuits and comprises a folded cascode amplifier module, a ClassAB output stage bias module, a ClassAB output stage control module and a ClassAB output stage compensation module. The folded cascode amplifier module is used for providing gain for a loop and ensuring the loop gain of a negative feedback system and the accuracy of output voltage; the ClassAB output stage bias module is used for generating bias reference voltage of an output power tube and providing a reference value of quiescent current; the ClassAB output stage control module generates grid voltage of an output power tube through a differential amplifier and controls static and dynamic current of the output power tube; and the ClassAB output stage compensation module is used for compensating the stability of the loop and ensuring the stability of the loop under the condition of large-range output current.

Disclosed is a two-stage successive approximation register analog to digital converter based on a difference and differential amplifier, including a first-stage sub-ADC, a difference and differential amplifier, and a second-stage sub-ADC connected in sequence. The first-stage sub-ADC and the second-stage sub-ADC each include capacitor arrays and comparators. The difference and differential amplifier includes a transconductance amplifier GM1, a transconductance amplifier GM2, a resistance load R, and proportional resistors R1 and R2. The transconductance amplifier GM1, the resistance load R, and the transconductance amplifier GM2 form a negative feedback loop. The disclosure adjusts the gain of the amplifiers through the proportional resistors R1 and R2, so that higher conversion accuracy can be achieved.

The utility model discloses an ultrasonic echo signal processing circuit, which comprises a differential amplification circuit, a band-pass filtering amplification circuit, a voltage reference circuit and a power supply control circuit, the input end of the differential amplification circuit is connected with the ultrasonic transducer, and the output end of the differential amplification circuit is coupled with the input end of the band-pass filtering amplification circuit through a capacitor; the output end of the band-pass filtering and amplifying circuit is connected with the signal acquisition end of the signal processor; a power-on time sequence control end of the signal processor is connected to the differential amplification circuit and the band-pass filtering amplification circuit through the power supply control circuit; the voltage reference circuit is connected to the differential amplification circuit and the band-pass filtering amplification circuit. The device is used for amplifying and filtering echo signals received by an ultrasonic receiving transducer, so that the signal amplitude meets the requirement of a signal processor on the quality of the echo signals and the requirement on power consumption under the condition of battery power supply.

A comparator is disclosed. The comparator includes an amplifier circuit, a latch circuit, and a boost circuit. The amplifier is configured to amplify a difference between the first and second differential inputs during an active phase of the comparator. The latch circuit includes first and second transistors, respectively coupled to first and second differential amplifier outputs, and configured to respectively drive first and second legs of the latch circuit during the active phase. The boost circuit includes first and second boost transistors respectively coupled to the first and second differential amplifier outputs, and configured to respectively provide a first supplemental current to the first differential output of the latch circuit and a second supplemental current to the second differential output of the latch circuit.

The invention discloses a dual-optical-path gas detection alarm device based on an intermediate infrared SLD, and relates to the technical field of gas safety monitoring and alarm, in particular to the dual-optical-path gas detection alarm device based on the intermediate infrared SLD. In order to solve the problems that an existing gas alarm device is high in false alarm rate and delayed in response, and cannot realize multi-component gas concentration threshold value judgment and sound-light alarm linkage at the same time, the invention provides a dual-light-path gas detection alarm device based on an intermediate infrared SLD. Comprising an SLD light source module, an optical beam splitting and transmission module, a multi-reflection gas absorption cell, a main tunable filter array, a main photoelectric detector array, a reference tunable filter array, a reference photoelectric detector array, a differential amplifier array, a signal processing module, a display module and an alarm module. The method is suitable for the application fields of petroleum, natural gas, mining, underground space operation and the like.

The invention discloses a low-noise audio acquisition circuit based on an underwater glider. The low-noise audio acquisition circuit comprises a controller module used for controlling all modules and data transmission; the data storage module is used for storing effective data transmitted by the controller module and the processor module; the data interaction module is used for collecting state information of the underwater glider and sending the state information to the data storage module; the data processing module comprises an operational amplifier, a gain amplifier, a fully differential amplifier and a hydrophone for collecting audio information; audio information collected by the hydrophone is firstly subjected to preliminary amplification and impedance matching through the operational amplifier, then enters the gain amplifier to be subjected to flexible gain adjustment and signal optimization, is further amplified through the fully differential amplifier and inhibits common-mode interference, and finally, the audio information is transmitted to the analog-to-digital converter to complete analog-to-digital conversion. The processor module processes the received audio information and transmits the processed audio information to the data storage module.

Amplifiers incorporating equalizer and bias offset correction circuits are described. An example amplifier circuit with equalizer and bias offset correction includes an amplifier with an input, an equalizer circuit coupled to the input of the amplifier, and a bias offset correction circuit coupled to the input of the amplifier. The bias offset correction circuit is configured to adjust a bias potential at the input of the amplifier. In one example, the amplifier is a differential amplifier with differential inputs, the equalizer circuit is coupled to the differential inputs of the amplifier and is configured to adjustably modify a gain of the amplifier over frequency, and the bias offset correction circuit is coupled to the differential inputs of the amplifier and is configured to compensate for modifications to bias potentials at the differential inputs of the amplifier due to operation of the equalizer circuit.

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.