41 results about "Instrument amplifier" patented technology

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 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 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 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 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 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 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 nondestructive testing system and method for weak eddy current signals. When a detected target object exists, output voltage signals of the two TMR sensors are amplified through the multi-path instrument amplifier, double-end differential output is converted into single-end output, then the two paths of output signals are offset through the strong and weak weighting operation circuit, and the rest path of voltage signal is output. The value of the background signal is reduced to highlight the weak change voltage, and the proportion of the voltage change brought by the weak eddy current signal under the background signal is increased; by adopting an amplifying circuit and a filtering circuit, filtering processing is carried out while the voltage signal is amplified, so that disturbance on the signal is as small as possible, a required frequency band is effectively separated from a complex signal, and meanwhile, unnecessary frequency components are inhibited; therefore, the signal quality is improved, and the detection accuracy is enhanced.

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

The invention discloses a linear Hall sensor and a temperature compensation method thereof. The linear Hall sensor comprises a Hall piece, a chopping modulation switch circuit, a first-stage instrument amplifier, a chopping demodulation switch circuit and a second-stage instrument amplifier. The chopping modulation switch circuit is used for carrying out chopping modulation on output voltages in two diagonal directions of the Hall piece; the first-stage instrument amplifier is used for amplifying the differential Hall voltage signal which is subjected to chopping modulation by the chopping modulation switching circuit; the chopping demodulation switch circuit is used for demodulating the modulation signal amplified by the first-stage instrument amplifier; and the second-stage instrument amplifier is used for further amplifying the Hall voltage signal obtained by the chopping demodulation switching circuit to obtain a voltage amplification factor changing along with the temperature, so that the voltage amplification factor changing along with the temperature of the Hall voltage signal is counteracted with the Hall voltage change caused by the temperature coefficient of the Hall piece. The precision and the stability of the linear Hall sensor can be improved.

The application relates to a lumbar force line dynamic monitoring and visual feedback system based on foot pressure sensing, relates to the field of intelligent medical rehabilitation apparatuses and wearable devices, and comprises intelligent shoes and a mobile terminal. A pressure sensor array in the intelligent shoes acquires dynamic pressure distribution data of each region of the foot bottom in real time, sequentially transmits the data to a microcontroller after signal acquisition through a multiplexing switch, signal amplification through an instrument amplifier and analog-digital conversion through an analog-digital converter, and sends the pressure distribution data to the mobile terminal through a wireless communication module after processing by the microcontroller. An alarm execution unit receives a control instruction sent by the microcontroller and issues an alarm prompt. A rechargeable lithium battery supplies power for the system, and a power management module provides a stable working voltage for the system. The application converts lumbar load risk into a visual image of foot pressure distribution through foot pressure sensing, realizes home, dynamic and non-invasive monitoring of the lumbar load and instant posture intervention.

The application discloses a kind of measurement method and system for improving the precision of differential resistance sensor, comprising: control constant current flows through reference resistance R S , differential resistance sensor resistance R1 and differential resistance sensor resistance R2;The voltage generated on reference resistance R S , differential resistance sensor resistance R1 and differential resistance sensor resistance R2 is introduced into instrument amplifier, and AD code value AD S , AD code value AD1 and AD code value AD2 are obtained using ADC converter;Using AD code value AD S , AD code value AD1 and AD code value AD2 calculate measurement parameter Z′;The measurement parameter Z′ is the difference between differential resistance sensor resistance R1 and differential resistance sensor resistance R2 is the sum of differential resistance sensor resistance R1 and differential resistance sensor resistance R2;Without changing the structure of existing differential resistance sensor, the sensitivity of the sensor is improved, and the linearity of the sensor is improved.

The invention discloses a high-input-impedance and low-noise capacitive coupling chopping instrument amplifier. The high-input-impedance and low-noise capacitive coupling chopping instrument amplifier comprises a main amplifier, a positive feedback loop, a pre-charging circuit and a direct-current servo loop. A positive feedback loop and a pre-charging technology are adopted, current flowing into an input capacitor Cin from a signal source is reduced through current compensation, and input impedance is improved. The positive feedback loop and the negative feedback loop share one chopper, so that the use of one chopper is reduced, and the layout area is reduced; the pre-charging circuit can take an amplifier with smaller power consumption as a buffer so as to reduce the power consumption of the system. Furthermore, a multi-rate duty ratio resistor is used as a large resistor of the integrator instead of a pseudo resistor, so that the noise introduced by the direct-current servo loop can be reduced. The circuit is good in performance, and has the advantages of high input impedance, low noise and low power consumption.

The invention discloses a sensor-based multi-channel bridge measuring device, which comprises a signal acquisition module, a signal conditioning module, a data processing module and a communication interface module, and is characterized in that the signal acquisition module is composed of 8-32 independent bridge circuits, each bridge circuit is connected with a resistance strain type sensor, and a full-bridge or half-bridge structure is adopted; the signal conditioning module comprises a multiplexer, an instrument amplifier and a filter circuit; and the multiplexer adopts a low-on-resistance analog switch. According to the multi-channel bridge measuring device based on the sensor, through multi-channel synchronous measurement (8-32 channels can be selected), the problem that a traditional device is low in single-point measurement efficiency is solved, the detection efficiency is improved, and through multiple anti-interference design (optoelectronic isolation, shielding and a filtering algorithm), the detection efficiency is improved. The problem of industrial field noise interference is solved, and measurement precision is guaranteed.

The invention relates to an ultra-stable crystal oscillator short-term stability system, which comprises a temperature measurement amplification circuit, which is used for acquiring a voltage difference between a thermistor and a temperature setting resistor through a balanced bridge in a three-operational-amplifier instrumentation amplifier, amplifying the voltage difference through a differential amplifier to obtain a temperature control voltage carrying offset voltage information, and sending the temperature control voltage to the temperature control amplification circuit; the signal is output to the second-stage amplification circuit; the thermistor is used for collecting the temperature of the ultra-stable crystal oscillator thermostatic bath; the temperature change compensation circuit is used for finely adjusting a temperature inflection point set value of an instrument amplifier in the temperature measurement amplification circuit, compensating frequency change caused by temperature gradient change of the thermostatic bath at high and low temperatures, and improving the stability of output frequency; the second-stage amplifying circuit is used for amplifying and outputting the difference between the standard reference voltage Vref and the temperature control voltage Vt; the error feedback control circuit is used for correcting the control voltage output by the two-stage amplification circuit to obtain a benchmark reference voltage Vref, so that the benchmark reference voltage Vref is dynamically adjusted according to temperature change, and system errors and error control voltage introduced by operational amplifier drift are reduced; and the power tube is used for heating the ultra-stable crystal oscillator thermostatic bath.

The invention discloses a gain regularization configuration circuit and method of an instrument amplifier, and relates to the technical field of analog integrated circuit design. The circuit comprises a gain resistance network, the gain resistance network is formed by combining a plurality of preset standard resistors, the gain resistance network is connected between two gain setting pins of an instrument amplifier, and the ratio of the internal integrated resistance value of the instrument amplifier to the gain resistance value of the gain resistance network is an integer; and the gain change-over switch is connected with the gain resistor network, and the gain change-over switch is set to change the combination relation of each standard resistor in the gain resistor network by switching the on-off state so as to enable the gain resistor network to form gain resistance values with different gains. According to the invention, a gain resistor configuration scheme can be provided for the instrumentation amplifier to realize regularized gain, low-cost standardized configuration is realized, and customized resistor configuration is pointed out at the same time.

The invention provides an input rail-to-rail high-impedance instrument amplifier with synchronous matching of chopping waves and dynamic elements, which adopts an AC coupling ripple suppression loop to be combined with a constant gain rail-to-rail input transconductance architecture based on common-mode detection, and is based on a synchronous SCPS method of the chopping waves and the dynamic elements. The influence of dynamic resistance of a switch on input impedance is reduced by synchronously controlling switching logic of a chopping switch and a dynamic element, and meanwhile, an alternating current coupling ripple suppression loop RRL is adopted to realize effective suppression of ripple voltage by offsetting offset current generated by input transconductance and feedback transconductance; rail-to-rail input and constant transconductance are achieved through constant-gain rail-to-rail input transconductance based on common-mode detection, so that the amplification precision is guaranteed; the invention provides an innovative architecture of an alternating current coupling ripple suppression loop and a common-mode detection-based constant gain rail-to-rail input transconductance, and by combining an SCPS technology, the design of an input rail-to-rail high-impedance instrumentation amplifier with synchronous matching of chopped waves and dynamic elements can be realized.

The application discloses a kind of instrument amplifier misadjustment voltage test method and device, it is related to amplifier (or integrated circuit) test technical field, method includes: by standard instrument amplifier and the measured instrument amplifier form group, test sets up standard instrument amplifier and the two groups of gain of measured instrument amplifier group body two total misadjustment voltages, namely accurate test instrument amplifier input misadjustment voltage and output misadjustment voltage can be realized, device includes: first condition applying module, first total misadjustment voltage acquisition module, second condition applying module, second total misadjustment voltage acquisition module, first calculation module, second calculation module, third calculation module, output module.This method and device can obtain higher test precision result with lower test resource requirement, can carry out automatic test.

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.

The invention provides a high-precision sampling circuit system applied to ground resistance measurement. The high-precision sampling circuit system comprises a first large-resistance resistor, a second large-resistance resistor, a 2khm resistor, a 5.1 khm resistor, a 12.5 khm resistor, a 49.9 khm resistor, a 453 khm resistor, a 380 khm resistor, a 0 khm resistor, an instrumentation amplifier, an analog switch, a 10khm resistor, a 100nm capacitor and a pull-down resistor. A sampling circuit of a grounding resistor generally needs to flexibly change a gain value of an amplifier according to an actual object to be measured, a common mode is that a feedback resistance value of an operational amplifier is changed by an analog switch, but the magnitude of an on-resistance value of the analog switch can influence a true value of a separating resistor, and the smaller the on-resistance value is, the smaller the influence is. However, the price of an analog switch with smaller on-resistance is high and is about ten times of that of a common analog switch. Therefore, the feedback resistor in the scheme is realized by changing the parallel resistance mode, and the influence of the resistance error in the parallel connection mode is greatly reduced.

The invention relates to a self-adaptive windowing differential integration and drift suppression method for an electromagnetic flowmeter. The method comprises the following implementation methods of hardware platform building, an action matching process after hardware platform building and a working process after the action matching process. The FPGA periodically sends out step wave excitation signals according to an excitation period, and an excitation current source is generated through excitation drive to drive an excitation coil; meanwhile, an electrode signal on a measuring pipe assembly mounted on the water pipe firstly enters a first-stage peak suppression, filtering and differential amplification circuit to prevent a first-stage operational amplifier from being saturated, then the signal enters a high-frequency filter to filter out a high-frequency signal and then enters a low-noise differential instrument amplifier, and the signal has a certain amplitude at the moment; then the signals enter an analog switch, and the signals subjected to windowing control of the analog switch enter an ADC for sampling through simple passive rc filtering; and the FPGA carries out I / Q calculation on the sampled data.

The present application belongs to the technical field of vibration sensor, and relates to a graphene flexible vibration sensing system for curved surface structure of power transmission and transformation equipment, comprising a front-end sensing probe, a shielded radio frequency cable and an integrated processing host. The front-end sensing probe takes PI flexible film as a substrate, adopts permalloy shell and flexible PI aluminum plated film to construct composite shielding rigid-flexible combined packaging; the integrated processing host adopts metal shell, internally suspends and fixes a signal processing circuit board through a copper column, and places a battery at the bottom; the signal processing circuit comprises a Wheatstone bridge, an instrument amplifier, a voltage follower, a high-pass filter, a low-pass filter and a two-stage amplification circuit connected in sequence; the present application realizes self-adaptive and lossless attachment of the sensor on a GIS and other special-shaped curved surfaces, and effectively overcomes strong electromagnetic interference through a composite shielding and isolation buffer high-fidelity conditioning circuit, greatly improving the purity of the detection signal and the system reliability.

This patent describes the concept and implementation of an audio amplifier with the special capability of driving speakers with analog circuits without generating electroacoustic noise due to sound and heat propagation through circuit component materials in the presence of an audio signal. Its highly resistant structure to electromechanical stresses reduces the generation of such noise, and appropriate circuitry can even counteract residual effects. Compared to prior art, the invention significantly improves sound quality, giving musicians greater freedom of tonal exploration and improved ease of performance. Similar improvements are observed when using the invention to drive speakers in music production studios, and in any application requiring the highest sound quality.

The application proposes a chopping and dynamic element matching synchronous input rail-to-rail high-impedance instrument amplifier, adopts an AC coupling ripple rejection loop combined with a constant gain rail-to-rail input transconductance based on common mode detection architecture, a chopping and dynamic element matching synchronous SCPS method, reduces the influence of switch dynamic resistance on input impedance by synchronously controlling the switching logic of chopping switch and dynamic element, and simultaneously adopts an AC coupling ripple rejection loop RRL to offset the offset current generated by input transconductance and feedback transconductance, thereby effectively suppressing ripple voltage; the constant gain rail-to-rail input transconductance based on common mode detection is used to achieve rail-to-rail input and constant transconductance, thereby ensuring amplification precision; the application proposes an innovative architecture of "AC coupling ripple rejection loop + constant gain rail-to-rail input transconductance based on common mode detection", which, combined with SCPS technology, can realize the design of a chopping and dynamic element matching synchronous input rail-to-rail high-impedance instrument amplifier.