73 results about "Instrument amplifier" patented technology

The invention discloses an output voltage detection method and system based on an aviation power supply, and relates to the technical field of aviation power supply voltage detection. A differential voltage sensor is connected to the output end of an aviation power supply, a high-frequency suppression capacitor is connected in parallel, the sampling rate of 20-50 times of the working frequency is set according to the type of the power supply, and the signals are collected and converted into analog voltage signals; the analog signal is subjected to two-stage filtering, is amplified to 0-5V through an instrument amplifier, and is converted into a digital voltage sequence through a 16-bit ADC (Analog to Digital Converter); calculating AC power supply effective value, peak value and other parameters, DC power supply average value, ripple coefficient and other parameters; comparing the characteristic parameters with a preset threshold value, determining that the characteristic parameters exceed the threshold value and recording related information; and a detection result is transmitted to a monitoring terminal through an RS485, data is locally stored, and a switching value is output to an alarm device when the data is abnormal. The method adapts to aviation power supply load fluctuation and environment temperature change, detection precision is high, data transmission and storage are safe, abnormity is accurately identified and early warning is carried out in advance, and aviation power supply operation and maintenance reliability and efficiency are improved.

The invention discloses a low-noise and high-precision analog front-end circuit for biological signal acquisition. The low-noise and high-precision analog front-end circuit comprises a chopping capacitance coupling type instrument amplifier circuit, a switched capacitor type programmable gain amplifier circuit and a Sigma-Delta analog-to-digital converter modulator circuit. T-type capacitance feedback, chopping modulation and programmable technologies are introduced on the basis of an existing amplifier, and the low-noise and programmable gain functions of the pre-amplifier are achieved. Through the three-order one-bit quantized feed-forward chopping type Sigma-Delta modulator, the signal to noise ratio and the effective bit number of the signal are improved. Compared with the prior art, the analog front-end circuit not only has the capability of changing the gain multiple according to the bio-electricity signal, but also has the low-noise and high-precision signal processing effect, and the problems that a traditional analog front-end circuit is large in noise and low in signal processing precision are solved. In addition, the biological signal acquisition-oriented circuit provided by the invention can also be used in other analog front ends, such as an audio processor and the like, and is wide in application range.

The invention provides a temperature sensor for rapid calibration and a calibration method of the temperature sensor, and the temperature sensor comprises a bias module which is used for providing a bias current for a temperature sensing module; the temperature sensing module is used for determining a first VBE voltage and a second VBE voltage according to the bias current, generating a voltage signal in positive correlation with the temperature through a VBE voltage difference between the first VBE voltage and the second VBE voltage, and transmitting the voltage signal to the analog-to-digital conversion module and the instrument amplifier respectively; the analog-to-digital conversion module is used for determining a first temperature value through the voltage signal and the original reference voltage of the temperature sensor; the instrument amplifier is used for determining a second temperature value through the voltage signal; wherein the temperature difference value between the first temperature value and the second temperature value is used for calibrating the original reference voltage to obtain the target reference voltage. According to the embodiment of the invention, the environment requirement for temperature sensor chip calibration can be greatly reduced, the calibration time of the chip is shortened, and the production efficiency of the chip is improved.

The invention relates to the technical field of amplifiers, and discloses an analog-to-digital converter combination instrument amplifier which comprises a first-stage amplifier, the first-stage amplifier is in signal connection with a second-stage amplifier, the second-stage amplifier is in signal connection with a front-end low-pass filter (LPF), the front-end low-pass filter (LPF) is in signal connection with an analog-to-digital converter (ADC), and the analog-to-digital converter (ADC) is in signal connection with the analog-to-digital converter. And an unbalanced input-to-balanced differential circuit output module is arranged between the second-stage amplifier signal and a front-end low-pass filter (LPF). From the perspective of signal processing and conversion, a precise signal transition bridge is constructed by adding an unbalanced input-to-balanced differential circuit output module, unbalanced signals output by a second-stage amplifier are converted into double-end balanced differential signals, common-mode noise interference is effectively resisted through a differential transmission mode, the signal purity is guaranteed, and the signal quality is improved. The front-end low-pass filter and the analog-to-digital converter are adaptive to differential signals, so that the signal transmission is stable and anti-interference, and the analog-to-digital conversion is more accurate.

The invention provides a frequency converter embedded current waveform analysis method and system and a medium, and relates to the technical field of current waveform analysis, and the method comprises the steps: obtaining a sampling circuit configured in a current path of a frequency converter; calculating the required total gain based on the original output voltage signal of the sampling resistor and the required input voltage of the analog-to-digital converter; the signal quality of the original output voltage signal is evaluated, the required total gain is dynamically distributed to an instrument amplifier and a programmable gain amplifier, the original output voltage signal is amplified and then passes through an analog-to-digital converter, and current waveform data is obtained for current anomaly analysis; when the signal quality is lower than a first threshold value, the gain share of the instrument amplifier is increased preferentially; when the signal quality is higher than a second threshold, the gain share of the programmable gain amplifier is increased preferentially. According to the invention, the technical problem of low accuracy of current waveform analysis in the prior art can be solved, and the technical effect of improving the accuracy of waveform analysis is achieved.

The invention relates to the technical field of integrated circuits, and discloses a high-pass filter circuit and a low-noise and high-common-mode-rejection-ratio high-speed instrument amplifier, and the low-noise and high-common-mode-rejection-ratio high-speed instrument amplifier comprises a high-pass filter circuit which is used for providing a high-pass filtering function; the input end of the current feedback instrument amplifier circuit is connected with the high-pass filter circuit and used for providing high input impedance and a high common-mode rejection ratio, and the input end of the transconductance amplifier circuit is connected with the output end of the current feedback instrument amplifier circuit and used for improving the load driving capacity; wherein the high-pass filtering circuit adopts a connection mode of a small-capacitance capacitor and an adjustable pseudo resistor to realize high-pass filtering, and the small-capacitance capacitor refers to an on-chip capacitor of which the capacitance value is less than 100pF so as to realize complete integration. The instrument amplifier effectively solves the problem that a traditional instrument amplifier cannot have high speed, low noise, high common-mode rejection ratio and direct-current voltage offset suppression at the same time.

The invention discloses a signal acquisition circuit for a brain-computer interface, and relates to the technical field of integrated circuits. The acquisition circuit comprises a sensing amplifier, wherein the sensing amplifier comprises a chopping modulation capacitance coupling instrument amplifier and a band-pass filter which are connected in series; the chopping modulation capacitance coupling instrument amplifier comprises an input main chopping modulator, an input capacitor, a negative feedback circuit, a first amplification circuit and a second amplification circuit which are sequentially connected in series; a pre-charging circuit, an input capacitor and a first amplifying circuit are connected to the input main chopping modulator in parallel, a positive feedback enhancing loop is connected to a second amplifying circuit in parallel, the first amplifying circuit and the second amplifying circuit are connected with a first direct-current servo loop and a negative feedback circuit in parallel, and a ripple suppression loop is connected to the second amplifying circuit in parallel. And the second amplification circuit is connected with the signal output end through the band-pass filter. The sensing amplifier in the acquisition circuit can output the electroencephalogram signals with higher quality, so that the quality of the acquired brain-computer interface signals is higher.

The invention relates to the technical field of measurement of long-distance and high-accuracy temperature measurement resistors, and particularly discloses a resistor temperature measurement method, which comprises a constant current source I, temperature measurement resistors RX and RY, a reference resistor RR, an analog switch, an instrument amplifier, an analog-to-digital converter and a microcontroller, the method comprises the following specific steps that S1, an analog switch controls a constant current source I to sequentially flow through temperature measurement resistors RX and RY and a reference resistor RR, and current generates a voltage on each resistor and is in direct proportion to the resistance value of the voltage; and S2, measuring the voltages of the temperature measuring resistors RX and RY and the reference resistor RR through an instrument amplifier and an analog-to-digital converter to obtain VX1, the voltage of the temperature measuring resistor RX under the forward current condition, VY1, the voltage of the temperature measuring resistor RY under the forward current condition, and VR1, the voltage of the temperature measuring resistor RR under the forward current condition. According to the resistance temperature measurement method, 0.00025 DEG C or better uncertainty can be obtained, and observable errors caused by thermoelectromotive force can be effectively eliminated.

The application discloses a kind of multi-modal flexible sensor adaptive signal conditioning system design method, belong to flexible sensor signal conditioning technical field.The present application overcomes the defects of poor universality, performance compromise, high cost of mass production of existing conditioning circuit, adopts layered decoupling and dynamic reconstruction system-level architecture: through multi-modal feature analysis and demand mapping modeling, the feature vector composition of scene recognition is determined;Design configurable analog front end, integrate instrument amplifier, transimpedance amplifier, charge amplifier, bridge amplifier four parallel processing sub-modules, wherein charge and bridge amplifier adopt self-designed architecture with dynamic adaptive gain adjustment capability;Build heterogeneous digital processing platform with NPU, CPU, DSP as core, through cross-modal data fusion, scene recognition engine, dynamic hardware configuration combined with feedforward and feedback, loadable algorithm library and closed-loop optimization control law, realize the real-time scene reconstruction of hardware parameters and digital algorithm;Combined with domestic single-chip selection, rigid-flex PCB and automatic calibration, meet the demand of low-cost mass production.The present application realizes the native adaptation and performance optimization of single hardware platform to voltage, current, charge, impedance and other types of sensor signals, and can be widely applied in robot dexterous hand, medical monitoring, intelligent bandage, consumer motion monitoring and industrial monitoring fields.

The application provides a kind of hollow core polarization maintaining optical fiber cutting machine tension control system and control method, belong to optical fiber cutting control technical field, system uses four layers architecture of perception layer, processing layer, control layer, execution layer: perception layer is measured by double strain gauge symmetrical compensation device and temperature sensor synchronous acquisition mechanics and environmental signal;Processing layer adopts Wheatstone bridge, instrument amplifier, low-pass filter, 16-bit ADC and temperature compensation unit to realize signal multistage conditioning;Control layer deploys feedforward adaptive PID compound control system, combined with optical fiber diameter-tension parameter library feedforward compensation and dynamic PID adjustment, and integrates step loading control and fault early warning mechanism;Execution layer adopts torque mode motor and outputs linear tension through lead screw mechanism.

A robotic system is provided, which automatically changes settings on an audio system. The audio system (e.g., an instrument amplifier, effect processor, etc.) typically includes one or more controls that impact the operation of the audio system. Correspondingly, the robotic system includes a device interface coupled to a control sequencer. The device interface adapts to one or more controls of the audio system that are to be changed. In this regard, the device interface includes one or more control couplers. Each control coupler is adapted to a corresponding control of the audio system to be changed. The control sequencer provides a control sequence to the device interface that causes the control coupler(s) to vary the settings on the audio system. In practical applications, a combination of sequence values of the control sequence can represent a sufficiently high number of samples to determine a responsive behavior of the audio system.

A kind of parallel machine current adding system belongs to the technical field of electronic equipment for measurement and testing, solve how to design a kind of hardware circuit simple, control precision high parallel machine current adding and system problem;The parallel machine current adding and system of the present application, comprising: multiple single machine current sampling circuits, parallel machine current adding and circuit;Single machine current sampling circuit includes: first differential amplifier circuit, first proportional regulating circuit, first unit inverter circuit, first digital potentiometer;Parallel machine current adding and circuit includes: instrument amplifier circuit, second proportional regulating circuit, second unit inverter circuit, second digital potentiometer and multiple proportional input end resistance;Digital potentiometer is applied to parallel machine circuit, and the resistance value of potentiometer is assigned by the number of parallel machine table set to realize the adjustment of amplification factor, replace the single proportional resistance resistance value of traditional resistance proportional circuit to realize the adjustment of amplification factor, hardware circuit is simple, amplification factor control is accurate.

The present invention belongs to the technical field of cardiopulmonary function detection, and specifically relates to a high-precision, sports-type, non-invasive portable cardiopulmonary function parameter measurement device, comprising a host computer and a slave computer, the slave computer comprising an electrocardiogram detection module, a chest impedance detection module, a microcontroller and a wireless communication module, the chest impedance detection module comprising a signal generator, a filter, a constant current source, an instrument amplifier, a common-mode filter, a detection circuit, a high-pass filter, a high-precision signal amplifier, a differential circuit and a voltage raising module; the slave computer also comprises an acceleration sensor, and the device ensures that electrocardiogram signals and chest impedance signals can be accurately detected even in a motion state, greatly reduces noise interference caused by motion, improves the recognition of data feature points by the host computer algorithm, makes the detection data more accurate, and fills the gap in the domestic non-invasive cardiopulmonary related equipment for exercise cardiopulmonary function.

Implementations and methods of an audio amplifier having a special function of driving a speaker without generating electro-acoustic noise are described herein. The phenomenon is inherent in an analog circuit, and is caused by the propagation of sound and heat when an audio signal acts on a circuit element material. The structure which is more resistant to electromechanical stress is not easy to generate such noise, and the appropriate circuit can also eliminate the residual effect. Compared with the prior art, the tone quality is greatly improved, and a music player has a greater degree of freedom in the aspect of tone research and can play music more easily. Similar improvements are also obtained when the invention is used for driving loudspeakers of music making studios and all applications requiring optimal sound quality.

The invention belongs to the field of integrated circuits, and discloses a low-voltage high-precision instrumentation amplifier analog IC (integrated circuit) chip which takes a high-performance reference current source circuit without an operational amplifier as a biasing circuit. In the low-voltage design, in order to solve the problem that the signal-to-noise ratio of the instrument amplifier is gradually deteriorated, a rail-to-rail input and output structure is adopted. According to the invention, the folded cascode structure provides a large gain and also serves as a resistor to be connected with the Miller compensation capacitor to form an unconventional RC network, so that the zero point problem is ingeniously solved, the additional chip area is not increased, and the response speed of the instrument amplifier is also improved; the MOS capacitor is used as the compensation capacitor, compared with a traditional metal capacitor, the MOS capacitor has the advantages of being high in integration level, small in area and the like, and the chip area is greatly reduced while the compensation effect is achieved.

The invention discloses an underground receiving system suitable for a borehole telemetering system, which comprises a differential pre-amplification receiving circuit, a differential filtering amplification circuit, a differential amplification circuit, a differential data acquisition circuit and a main control unit which are electrically connected together in sequence, the differential output signals Vout + and Vout-of the previous circuit are the differential input signals Vin + and Vin-of the next circuit, and the differential output signals Vout + and Vout-of the differential data acquisition circuit are sent to the main control unit for processing. According to the system disclosed by the invention, a fully differential circuit design is adopted, so that common-mode signal input is avoided. And a low-noise instrument amplifier is arranged in the differential pre-amplification receiving circuit, so that the signal input noise can be reduced, and the common-mode influence can be reduced. A single-end power supply is used for supplying power, the number of power supply groups and occupied space are reduced, and the device is suitable for being used in underground limited space.

The utility model discloses a kind of multi-loop processing CV mode electronic load instrument, it includes main control module, main power module, auxiliary power module, display module, button module, power amplifier module, communication board module and interface module.Main control module is core control unit, contains instrument amplifier, and difference proportional circuit, integrated operational amplifier circuit, advance adjustment circuit, lag adjustment circuit and analog switch, different input signal characteristics are adapted by flexible switching adjustment mode.The main power module and auxiliary power module provide stable power supply respectively;Display module and button module form man-machine interface;Power amplifier module drives high-power MOS tube to maintain constant voltage output;Communication board module supports multiple communication protocols;Interface module provides physical connection port for external equipment.The utility model significantly improves system stability and adaptability through multi-loop design, suitable for a variety of application scenarios.

The invention relates to the technical field of electromagnetic positioning, in particular to a five-degree-of-freedom sensor for electromagnetic positioning and an induction signal processing system, and the induction signal processing system adopts a three-stage circuit architecture: the first stage is an instrument amplifier pre-amplification circuit with input filtering and common-mode suppression functions; the low-noise amplifier is used for performing low-noise amplification on a microvolt-level original signal; the second stage is a Sallen-Key type active high-pass filter circuit and is used for suppressing power frequency and low frequency interference; and the third stage is a Sallen-Key type active low-pass filter circuit which is used for filtering high-frequency noise. Wherein the output of the pre-amplification circuit is connected to the third-stage low-pass filter circuit and then is cascaded with the second-stage high-pass filter circuit to jointly form a band-pass filter path, and finally, a stable analog signal with a high signal-to-noise ratio is output. The problems that a micro sensor is weak in signal, prone to interference and high in system complexity are effectively solved, and the performance and reliability of the electromagnetic positioning system in high-precision application scenes such as medical navigation and virtual reality are remarkably improved.

The invention discloses a strong PUF (Physical Unclonable Function) circuit for security protection of the Internet of Things, which comprises two TMR sensor arrays, two instrumentation amplifiers, two switched capacitor integrators and a comparator, and is characterized in that each TMR sensor array comprises a plurality of TMR sensor units, and the conduction number of the TMR sensor units in the two TMR sensor arrays is controlled through an excitation signal; two differential voltage signals are generated, two instrument amplifiers respectively carry out differential amplification on the two differential voltage signals to generate amplified voltage signals, two switched capacitor integrators respectively carry out sampling and accumulation on the amplified voltage signals to obtain sampled voltage signals, and the sampled voltage signals are output to a comparator. The comparator carries out voltage polarity judgment on the two sampling voltage signals to obtain a PUF response; the method has the advantages of high uniqueness and randomness, high stability, low bit error rate and high excitation-response pair number, and can meet the requirements of a high-reliability large-scale security authentication system.

The invention relates to the technical field of intelligent pots, and particularly discloses a temperature control system and method for an intelligent pot, and the system comprises a temperature collection module which comprises a temperature sensor and a signal conditioning circuit, and the signal conditioning circuit comprises an instrument amplifier and a low-pass filter which are electrically connected in sequence, the output end of the temperature sensor is electrically connected with the input end of the instrument amplifier; the signal input end of the core control unit is electrically connected with the output end of the low-pass filter; the power adjusting module comprises a PWM generating circuit and a power driving circuit, the control end of the PWM generating circuit is electrically connected with the PWM output end of the core control unit, and the input end of the power driving circuit is electrically connected with the output end of the PWM generating circuit; the self-adaptive power management unit comprises a DC-DC conversion circuit, and the DC-DC conversion circuit is electrically connected with the temperature acquisition module, the core control unit and the power regulation module; the problems that a temperature control system of an intelligent pot is unstable in structure, inaccurate in temperature measurement and weak in anti-interference capacity are solved.

The embodiment of the invention discloses a capacitive coupling chopping instrument amplifier circuit and a ripple calibration method. The circuit comprises a first chopping switch, an input capacitor, a first resistor, a second resistor, a two-stage operational amplifier circuit, a feedback capacitor, a second chopping switch and a ripple calibration module, the two-stage operational amplifier circuit comprises a plurality of first transistors and a plurality of second transistors which are used for signal amplification; the control end of the first transistor is connected with the first input end of the two-stage operational amplifier circuit, and the control end of the second transistor is connected with the second input end of the two-stage operational amplifier circuit; the ripple calibration module is connected with the first output end and the second output end of the two-stage operational amplifier circuit, samples signals of the first output end and the second output end of the two-stage operational amplifier circuit, and controls the access number of the first transistor and the second transistor according to the sampled signals; ripple waves generated by the chopping instrument amplifier circuit are reduced. The problem that a capacitor coupling chopping instrument amplifier circuit generates ripples due to offset voltage is solved.

The application discloses an output voltage detection method and system based on an aviation power supply, and relates to the technical field of aviation power supply voltage detection; a differential voltage sensor is connected to the output end of the aviation power supply, a high-frequency suppression capacitor is connected in parallel, a sampling rate of 20-50 times the working frequency is set according to the type of the power supply, analog voltage signals are collected and converted, two-stage filtering is performed on the analog signals, the analog signals are amplified to 0-5V by an instrument amplifier, and then the analog signals are converted into digital voltage sequences by a 16-bit ADC; the effective value, peak value and other parameters of the alternating-current power supply, the average value, ripple coefficient and other parameters of the direct-current power supply are calculated; the characteristic parameters are compared with preset threshold values, and if the characteristic parameters exceed the threshold values, it is determined that an abnormality occurs and relevant information is recorded; the detection results are transmitted to a monitoring terminal through RS485, data is stored locally, and when an abnormality occurs, an output switch quantity is output to an alarm device. The application is adapted to aviation power supply load fluctuation and environmental temperature change, has high detection precision, safe data transmission and storage, can accurately identify an abnormality and give an early warning, and improves the reliability and efficiency of aviation power supply operation and maintenance.

This invention provides an electrocardiogram (ECG) instrument amplifier circuit and an ECG signal acquisition system. In the ECG instrument amplifier circuit provided by this invention, a first terminal of a first capacitor scaling circuit is connected to the first output terminal of the instrument amplifier; a second terminal of the first capacitor scaling circuit is connected to the first terminal of a first neutralizing capacitor array; the second terminal of the first neutralizing capacitor array is connected to the first terminal of a first switch; and the second terminal of the first switch is connected to the first input terminal of the instrument amplifier. A second capacitor scaling circuit has its first terminal connected to the second output terminal of the instrument amplifier; its second terminal is connected to the first terminal of a second neutralizing capacitor array; the second terminal of the second neutralizing capacitor array is connected to the first terminal of a second switch; and the second terminal of the second switch is connected to the second input terminal of the instrument amplifier. A parasitic capacitance calibration circuit is connected to both the first and second input terminals of the instrument amplifier. This ECG instrument amplifier circuit can significantly improve the input impedance of the instrument amplifier.

The present invention provides an electronic throttle module with throttle opening display and fault diagnosis functions, and relates to the field of engine test technology. The electronic throttle module with throttle opening display and fault diagnosis functions includes a power supply circuit, a 6-pin aviation plug J1, a DC-DC power supply module P1, a connector J2, a dual-channel instrument amplifier integrated circuit IC1, and a DC voltmeter V1. In the present invention, the module verifies the correctness of the two sets of voltages based on the amplitude and linear relationship between the two voltages of the electronic throttle, displays the throttle opening through a DC voltmeter, displays the fault through the on and off status of two LED fault indicator lights, and judges the cause of the fault accordingly. It also adopts a double-sided copper-clad circuit board to achieve an integrated design, and uses a transparent cover waterproof box to achieve a waterproof function. It is suitable for use in engine test benches to reduce the difficulty of troubleshooting and improve work efficiency. It is suitable for promotion and application in the field of engine test technology and can be directly used to guide the design or production of related products.

The present invention provides a double-ended output circuit and a signal processing circuit based on a single-ended signal source, in which the signal processing circuit based on the single-ended signal source is configured to amplify an original signal in a single-ended signal form output by the single-ended signal source with an instrumentation amplifier (In-Amp), so as to utilize the high input impedance of the instrumentation amplifier and improve the signal processing efficiency. Complete and high-precision amplification processing is carried out on an original signal in a single-ended signal form output by the single-ended signal source by virtue of the native advantages of high common-mode rejection ratio, high gain adjustment precision, low temperature drift, good linearity and low noise; therefore, weak signals in original signals output by the single-ended signal source can be effectively captured, and the reliability of a corresponding sensing device adopting the signal processing circuit based on the single-ended signal source is guaranteed correspondingly when the single-ended signal source is a corresponding sensing device.

The application belongs to the technical field of analog integrated circuits, and particularly relates to a capacitive coupling chopping instrument amplifier with enhanced input impedance. The self-calibration gate voltage self-boosting charging circuit and the self-zeroing auxiliary operational amplifier are designed in a function complementary and time sequence cooperative mode, and a principle breakthrough is realized through the function complementary and time sequence cooperation. The self-calibration gate voltage self-boosting charging circuit completes high-speed dynamic voltage building at the chopping switching moment, and solves the problem of insufficient building speed of the traditional auxiliary operational amplifier. The self-zeroing auxiliary operational amplifier completes static precision calibration and noise suppression, and eliminates the establishment error of the gate voltage self-boosting and the noise of the auxiliary circuit. The two cooperate to simultaneously realize rapid, high-precision and low-noise establishment of the input capacitor under low power consumption, so that the system obtains a G omega order super-high input impedance, and the high input impedance, low noise and low power consumption are cooperatively optimized, which breaks through the inherent design bottleneck in the industry.

The invention discloses a graphene aerogel vibration sensor signal acquisition system and method, and belongs to the technical field of sensor signal acquisition, and the system comprises a Wheatstone bridge module which is used for converting mechanical vibration sensed by a graphene aerogel sensor into a microvolt differential voltage signal; the instrument amplifier is used for converting the differential voltage signal into an amplified voltage signal with adjustable gain; the second-order low-pass filtering module is used for filtering high-frequency noise of the amplified voltage signal and outputting a filtered signal; the impedance optimization module is used for executing an adaptive impedance matching algorithm based on the characteristics of the filtered signal, dynamically adjusting the input impedance of the system and outputting an impedance-matched signal; the analog-to-digital conversion module is used for converting the impedance-matched signal into a digital signal and outputting the digital signal to an upper computer; according to the invention, through the multi-stage noise suppression strategy and the precise adaptation with the characteristics of the sensor, the acquisition precision of the weak vibration signal and the system robustness are significantly improved.

The utility model discloses a practical pacing pulse detection circuit which comprises an electrocardio pre-amplifier circuit, a high-pass filter circuit, an amplifier circuit, a programmable window comparator circuit, an OR operation logic gate circuit and a single-chip microcomputer which are connected in sequence, and the single-chip microcomputer is connected with the programmable window comparator circuit. The electrocardio pre-amplifier comprises a differential input amplification circuit, an instrument amplifier circuit and an input filter circuit, the differential input amplification circuit is connected with the input filter circuit, and the instrument amplifier circuit is connected with the differential input amplification circuit. The utility model has the beneficial effects that the problem of missing detection is effectively avoided, the reliability is improved, the problem that the resources are occupied when the pace-making pulse is detected by software is solved, the occupied resources are less, and the additional resources of the single chip microcomputer are not occupied.

The utility model relates to a temperature compensation circuit of a piezoresistive pressure sensor and the piezoresistive pressure sensor, a Wheatstone bridge adopts a constant voltage power supply mode, and the power supply current of the Wheatstone bridge is sampled as a positive feedback signal to compensate the temperature drift of the pressure sensor. The output voltage of the instrument amplifier returns to zero through the zeroing unit when the measured pressure is zero, and the output voltage (unit is millivolt) of the instrument amplifier is just the pressure value (unit is kilopascal) detected by the pressure sensor through the gain resistor, so that the direct reading of the pressure detected by the sensor is realized.

The invention discloses a sensor circuit, a sensor and a sensor fault detection method, relates to the technical field of power electronics, and realizes sensor fault detection. The sensor circuit comprises a bridge circuit, an instrument amplifying circuit, a first current-limiting resistor and a control unit, the input end positive electrode of the bridge circuit is electrically connected with a power supply, and the input end negative electrode of the bridge circuit is grounded through the first current-limiting resistor; the output end of the bridge circuit is electrically connected with the input end of the instrument amplification circuit; and the output end of the instrument amplification circuit and the negative electrode of the input end of the bridge circuit are electrically connected with the control unit.