21 results about "Instrumentation amplifier" patented technology

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 present application relates to the technical field of electronic circuit, and especially relates to a readout circuit of a terahertz detection array, which comprises: a readout link at least comprising a current feedback instrumentation amplifier, a programmable gain amplifier and an incremental analog-to-digital converter connected in sequence; the current feedback instrumentation amplifier amplifies the signal output by the detector and outputs a first-stage amplified signal, the current feedback instrumentation amplifier comprises an instrumentation amplifier body and a first ripple suppression module, the first ripple suppression module comprises a first redundant segmented current steering DAC and a first DAC code register; the programmable gain amplifier further amplifies the first-stage amplified signal, the programmable gain amplifier comprises a gain amplifier body and a second ripple suppression module, and the second ripple suppression module comprises a second redundant segmented current steering DAC and a second DAC code register. The present application effectively reduces the chip area and power consumption while ensuring that the readout circuit of the terahertz detection array has high gain, low noise and low offset.

This invention belongs to the field of industrial automation testing and metallurgical instrumentation technology, and relates to a rotary temperature measuring device for strip steel. It includes a mounting body and a rotary temperature measuring assembly located at the bottom of the mounting body. The rotary temperature measuring assembly includes a rotating roller, multiple heat-conducting elements, multiple elastic connectors, a temperature acquisition component, and a conductive slip ring. The rotating roller is rotatably mounted at the bottom of the mounting body, and multiple mounting grooves are evenly distributed along its circumference. Each elastic connector is located between a heat-conducting element and a corresponding mounting groove. The temperature acquisition component includes multiple thermocouples, a maximum voltage selection circuit, an instrumentation amplifier, and a voltage-to-frequency converter connected in series. The input terminals of the multiple thermocouples are connected to their respective heat-conducting elements, and their output terminals are electrically connected to the maximum voltage selection circuit. This invention not only accurately measures the temperature of the strip steel but also prevents signal interference.

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.

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.

This invention relates to the field of power electronics technology, and more particularly to a design method for an adjustable high-precision sampling signal monitoring and protection circuit system. The technical solution includes the following steps: threshold setting, by adjusting the first adjustable resistor RP1 in the signal input and reference module to set the maximum output voltage of a reference circuit; and by adjusting an external knob JP3 to control the voltage input to the first operational amplifier to obtain a pre-set threshold electrical signal. This invention, through step-by-step adjustment of the adjustable resistor and external knob, in conjunction with a precision reference source, instrumentation amplifier, operational amplifier comparison channel, and isolation optocoupler, achieves precise threshold tuning, flexible matching of sampling signals, and reliable isolated output. The design method provides a quantitative calculation formula, solving the problems of poor reference stability, low threshold tuning accuracy, insufficient signal matching, and weak isolation and anti-interference capabilities in existing technologies.

This application provides an electromyography (EMG) signal acquisition circuit, belonging to the field of integrated circuit technology. The circuit includes an acquisition interface, a signal compensation circuit, and an instrumentation amplifier. The acquisition interface is used to acquire EMG differential-mode signals. The input terminal of the signal compensation circuit is connected to the amplification resistor of the instrumentation amplifier, and the output terminal of the signal compensation circuit is connected to the acquisition interface. The signal compensation circuit is used to acquire a compensation signal and perform signal compensation on the EMG differential-mode signal using the compensation signal. The input terminal of the instrumentation amplifier is connected to the acquisition interface, and the instrumentation amplifier is used to amplify the EMG differential-mode signal and output a first EMG signal. This application embodiment can improve the accuracy of EMG signal acquisition.

A system for real-time decomposition of electrophysiological signals and arrhythmia classification using adaptive neural signal processing, comprising: a plurality of electrodes configured to acquire electrophysiological signals from a subject; an analog input stage consisting of an instrumentation amplifier, an impedance matching circuit, and an anti-aliasing filter for processing the acquired electrophysiological signals; an analog-to-digital converter unit operationally coupled to the analog input stage and configured to digitize the processed electrophysiological signals at a programmable sampling rate; a processing unit consisting of a microcontroller and a digital signal processor operationally coupled to each other via a communication bus; and a neural processing unit operationally coupled to the processing unit.a storage unit that stores executable instructions and trained neural parameters; wherein the processing unit and the neural processing unit are configured to jointly perform an adaptive decomposition of the digitized electrophysiological signals into a variety of intrinsic signal components based on dynamically updated baseline representations, extract temporal and morphological features from the intrinsic signal components, and classify the extracted features in real time into one or more arrhythmia categories.

The application discloses a kind of electromyographic signal processing method, system and equipment for stroke patient rehabilitation training, belong to rehabilitation medical electronics technical field.Method includes: through three acquisition point serpentine grid flexible FPC electrode to obtain differential signal and reference signal, RF interference is filtered out by RFI filter;Signal is processed using three operational amplifier instrument amplifiers: first stage instrument amplifier suppresses common-mode interference and realizes primary filtering, second stage two-order active filter constitutes three-pole bandpass characteristic, and output signal amplitude is amplified to 2 / 3 of ADC range accurately;Direct current bias voltage generated by reference signal is superimposed with amplified signal, and bipolar signal is stabilized to the input range of adaptive ADC is converted by 24-bit ADC;It is transmitted to terminal by self-defined bluetooth protocol, and real-time generation electromyographic power spectral density analysis and rehabilitation quantization report.The technical scheme of the present application can effectively limit the signal band in the main energy range of electromyographic signal, filter out high-frequency noise and motion artifacts in addition to muscle signal.

The present disclosure provides an instrument amplifier with active protection drive, which introduces an active protection drive circuit outside the instrument amplification core circuit, so that the signal transmission line shielding layer potential follows the output potential of the input buffer circuit, thereby reducing the equivalent potential difference between the signal line core and the shielding layer, reducing the shunt effect caused by the parasitic capacitance, and further improving the effective bandwidth of the high impedance sensor measurement system; At the same time, the phase compensation network is arranged in the feedback loop of the protection drive amplifier, and the loop phase when driving the capacitive load is compensated, which can suppress ringing and oscillation, improve system stability and signal-to-noise ratio, and enhance the applicability and adjustability of the circuit under different cable lengths and parasitic capacitance conditions.

This invention discloses a wide-range configurable temperature sensor detection circuit, relating to the field of power electronics technology. It addresses the problems of ADC saturation, decreased resolution in the low-resistance range, and inconsistent bias errors in connection links when using a single device compatible with both low-resistance and high-resistance thermistors, where fixed excitation and fixed range can easily lead to these issues. The circuit switches the excitation intensity between low and high resistance ranges via a switchable constant current setting. In thermistor mode, it configures an optional voltage divider path, using a voltage divider attenuation coefficient to limit the sampling voltage in high-resistance scenarios to the range of subsequent input stages. When the voltage divider output exceeds a preset full-scale threshold, a parallel clamping resistor is connected to reduce the sensor's equivalent impedance. Simultaneously, it works with an adjustable gain instrumentation amplifier module, a low-pass filter, and ADC interface protection to achieve stable sampling across different resistance ranges and improve the consistency and reproducibility of resistance conversion before and after range switching.

This invention discloses a linear Hall sensor and its temperature compensation method. The linear Hall sensor includes a Hall element, a chopper modulation switching circuit, a first-stage instrumentation amplifier, a chopper demodulation switching circuit, and a second-stage instrumentation amplifier. The chopper modulation switching circuit is used to chop and modulate the output voltage of the Hall element in two diagonal directions. The first-stage instrumentation amplifier is used to amplify the differential Hall voltage signal chopped and modulated by the chopper modulation switching circuit. The chopper demodulation switching circuit is used to demodulate the modulated signal amplified by the first-stage instrumentation amplifier. The second-stage instrumentation amplifier is used to further amplify the Hall voltage signal obtained by the chopper demodulation switching circuit, obtaining a voltage amplification factor that varies with temperature, so that the voltage amplification factor of the Hall voltage signal varying with temperature cancels out the Hall voltage change caused by the temperature coefficient of the Hall element itself. This invention can improve the accuracy and stability of the linear Hall sensor.

This invention belongs to the field of bioelectronics and edge computing technology, specifically a low-power, monolithically integrated adaptive electronic signal processing system. The system integrates a signal input interface, a two-stage low-noise amplification and filtering module, a neuromorphic signal processing array, and a back-end drive output module. The front end employs a low-noise instrumentation amplifier with high common-mode rejection ratio and a multi-feedback bandpass filter to achieve high-fidelity extraction of weak temporal signals. The signal processing array uses a fully analog synapse-neuron nested primitive circuit, utilizing physical mechanisms such as pulse time-dependent plasticity to achieve decode-free adaptive feature encoding of non-stationary signals. This system uses a four-layer circuit board integration, resulting in extremely low single-channel static power consumption and an end-to-end signal processing delay of less than 5 ms. The system architecture completely eliminates the digital decoding delay of the von Neumann architecture, providing a highly reliable hardware-level solution for portable monitoring and closed-loop adaptive driving of weak signals.

The application relates to the technical field of circuit design, and provides a signal conditioning circuit suitable for bridge output and a high-precision signal sampling circuit, which is designed by selecting a high-performance instrument amplifier and a full-differential amplifier based on the bridge characteristics, a first-stage amplification filtering composed of an instrument amplifier, a first low-pass filter and an inverting amplifier, and a second-stage amplification filtering composed of a full-differential amplifier, two second low-pass filters and an output-stage low-pass filter are designed, the first-stage amplification filtering generates extremely high input impedance, so that the influence of bridge balance can be ignored, voltage difference is effectively extracted from a direct current component for conversion and amplification, a rail-to-rail full-differential amplifier design is adopted to realize stable full-scale output of signals and provide good input matching for an ADC chip, the signal resolution of 10 uV and below can be realized, and the signal sampling of the signal below uV can be realized.

The application discloses an immunohistochemical multi-channel incubation heating device and a temperature error optimization design method, and belongs to the medical detection field.The application utilizes internal wiring of a heating film integrated with a temperature sensor to realize four-wire output of the temperature sensor;analog multiplexing switches are adopted to poll and switch the input of the multi-channel temperature sensor, so that the multi-channel shares the same constant current source driving circuit, instrument amplification circuit and analog-digital conversion circuit;the constant current source drives the temperature sensor to generate a differential voltage signal, which is amplified by an instrument amplifier and then converted into a digital signal by an ADC, and real-time resistance values are calculated according to Ohm's law;based on a pre-stored thermal resistance scale, the minimum interval where the resistance value is located is determined by a table lookup method, and the corresponding temperature value is converted by using a linear equation fitted by interval endpoints;PWM modulation signals are output by a PID algorithm to drive the heating film to realize accurate temperature control.The application eliminates the problem that reference parameters are inconsistent due to the discreteness of electronic components when each channel is independently collected.

The application discloses a high signal-to-noise ratio signal acquisition method and device for electrocardio-cardiac sound integration, and belongs to the technical field of biomedical signal acquisition. The circuit adopts two instrument amplifiers to collect electrocardio signals and cardiac sound signals respectively, and fuses a programmable gain amplifier-low pass filter fusion circuit and an analog-to-digital converter through a switch array time-sharing multiplexing. The instrument amplifier integrates chopping modulation and an auxiliary loop to suppress noise and improve input impedance; the fusion circuit adopts a switched capacitor topology to realize programmable adjustment of gain and bandwidth. A clock manager uniformly controls channel switching and circuit parameter reconfiguration. The application realizes high signal-to-noise ratio synchronous acquisition of double-mode signals, and has low power consumption, small area and good wearable integration characteristics.

The application belongs to the technical field of electric digital data processing, and discloses a piezoelectric accelerometer signal conditioning method and circuit for low-frequency vibration measurement.The method comprises the following steps: selecting multiple IC piezoelectric accelerometers to be reversely docked and installed, forming two branches, and being used in pairs so that the sensed alternating acceleration signals are opposite to each other; using matched transistors to form a multi-channel constant current source for power supply; using multiple instrument amplifier chips to form a differential amplification circuit, adopting a direct current coupling connection form, introducing the signals of multiple IC piezoelectric accelerometers into the differential amplification circuit, doubling the sensitivity of the alternating acceleration signals while offsetting the direct current bias voltage; the similar direct current bias voltages are subtracted to be zero; and using the high common mode rejection ratio characteristic of the instrument amplifier chip, the common mode noise is further suppressed through two-stage differential amplification.The application further suppresses the common mode noise through two-stage differential amplification, and improves the signal-to-noise ratio of a low-frequency broadband test signal.

This utility model relates to the field of smart cookware technology, specifically disclosing a temperature control system for smart cookware, comprising: a temperature acquisition module, including a temperature sensor and a signal conditioning circuit, the signal conditioning circuit including an instrumentation amplifier and a low-pass filter connected in sequence, the output terminal of the temperature sensor being electrically connected to the input terminal of the instrumentation amplifier; a core control unit, the signal input terminal of the core control unit being electrically connected to the output terminal of the low-pass filter; a power regulation module, including a PWM generation circuit and a power drive circuit, the control terminal of the PWM generation circuit being electrically connected to the PWM output terminal of the core control unit, the input terminal of the power drive circuit being electrically connected to the output terminal of the PWM generation circuit; and an adaptive power management unit, including a DC-DC conversion circuit, the DC-DC conversion circuit being electrically connected to the temperature acquisition module, the core control unit, and the power regulation module respectively; this invention solves the problems of unstable structure, inaccurate temperature measurement, and weak anti-interference capability in the temperature control system of smart cookware.

The application discloses a kind of strong PUF circuits for Internet of Things security protection, including two TMR sensor arrays, two instrument amplifiers, two switched capacitor integrators and a comparator, TMR sensor array includes multiple TMR sensor units, the number of TMR sensor units in two TMR sensor arrays is controlled to be turned on by excitation signal, so that it generates differential voltage signal, two instrument amplifiers differentially amplify two differential voltage signals respectively, generate amplified voltage signal, two switched capacitor integrators are sampled and accumulated to amplified voltage signal respectively, and sample voltage signal is output to comparator, comparator carries out voltage polarity decision to two sample voltage signals, and obtains PUF response;The advantages are that it has higher uniqueness and randomness, and also has higher stability, lower bit error rate and higher excitation-response pair number, can meet the demand of high reliability large-scale security authentication system.