669 results about "Analog front-end" patented technology

A system may include multiple digital beamformer (DBF) circuits coupled to an analog front end that includes an antenna array. Each DBF circuit is coupled to a subset of the antenna elements of the array. Each DBF may be configured to adjust coefficients of complex multipliers to selectively enable and disable beams, antenna elements, transmit paths, receive paths, or any combination thereof to enable per-element calibration of the antenna array.

The invention discloses a multichannel electrophysiological signal acquisition system and an acquisition method thereof, and the multichannel electrophysiological signal acquisition system comprises a power supply module electrically connected with a controller, an analog front-end chipset, a filter module and an analog-to-digital conversion module; the analog front-end chip set is used for acquiring an analog signal and preprocessing the analog signal; the pre-processed analog signal is converted into a digital signal through a filter module and an analog-to-digital conversion module, and the digital signal is transmitted to a controller; the filter module is used for filtering and denoising; the timer module connected with the controller generates a sampling frequency, transmits the sampling frequency to the analog-to-digital conversion module, and provides a time sequence signal for the analog-to-digital conversion module. The invention discloses a multi-channel electrophysiological signal acquisition system, which solves the problem of synchronous sampling time sequence control of a high-density electrode array and eliminates signal phase deviation caused by clock jitter among multiple channels under the constraint of maintaining the total power consumption of the system. And real-time power frequency interference suppression is realized.

The invention discloses a dual-mode analog front end with a full-speed clock-free decision feedback equalizer (UC-DFE). The dual-mode analog front end comprises a terminating impedance matching network, a linear processing link, the UC-DFE and a signal output module, the terminating impedance matching network realizes broadband impedance matching and electrostatic protection; the linear processing link comprises a CTLE and a VGA and is used for compensating channel attenuation and expanding signal bandwidth; the UC-DFE comprises a summator, a static comparator, a delay unit and a feedback tap, and realizes high-speed signal processing and feedback equalization; and the signal output module converts the balanced signal into a target coding format and outputs the signal. According to the invention, the overall performance of the circuit is improved, the problems of time sequence tension, bandwidth limitation and the like of the traditional DFE architecture at a high speed are solved, and the circuit is suitable for 128Gbps high-speed PAM4 and NRZ signal transmission and shows better comprehensive performance.

The invention relates to a high-precision temperature sensor based on complementary dynamic element matching and a zoom analog-to-digital converter and a working method, and belongs to the technical field of sensor improvement, and the sensor comprises an analog front end, an analog-to-digital converter, a digital rear end and a control logic. An improved chopping technology is adopted, and one clock signal is adopted to control two sub operational amplifiers, so that the output stability and precision of the analog front end are improved. A complementary dynamic element matching technology is utilized, errors caused by voltage drop at the two ends of a switch are reduced, the influence of channel charge injection is counteracted, a scaling type analog-to-digital converter design is provided for an analog-to-digital conversion part, and balance among power consumption, speed and precision is achieved. According to the method, a 10-bit successive approximation register analog-to-digital converter is used for measuring a numerical value and a change trend, and the numerical value and the change trend are analyzed, so that the expression effects of a current mirror structure, a transistor, a filter and the like are evaluated, the aging of the transistor is found in advance, and a clear direction is provided for future design improvement.

The invention discloses a fault detection method, device and system and a storage medium. The fault detection method comprises the steps of obtaining at least two voltage sampling values; wherein the at least two voltage sampling values are obtained by at least two analog front-end modules in the battery monitoring unit through respective target sampling channels to perform voltage acquisition on the same analog battery cell; determining a voltage difference absolute value between every two voltage sampling values in the at least two voltage sampling values; and when the partial pressure difference absolute value in the at least two obtained pressure difference absolute values is greater than a preset threshold value, determining an abnormal target voltage sampling value according to the partial pressure difference absolute value, and determining that the target sampling channel of the corresponding target analog front-end module has an equalization fault according to the target voltage sampling value. Therefore, the accuracy of equalization fault identification can be improved, and the safety of the battery is further improved.

The various implementations described herein include techniques and apparatuses for multi-channel biopotential signal acquisition, biopotential signal pre-processing, and adaptive signal conditioning. In one aspect, an analog frontend circuit includes an instrumentation amplifier (INA) and an analog-to-digital circuit (ADC) in a forward signal path. A digital circuit receives input from the ADC. An adaptive baseline tracking and compensation circuit tracks and compensates moving motion artifact driven changes. A power line interference (PLI) detection and compensation circuit tracks a desired number of PLI harmonics, and magnitude, phase and frequency for the PLI harmonics in real time. A digital-to-analog converter (DAC) circuit combines output of the adaptive baseline tracking and compensation circuit and the PLI detection and compensation circuit to output an analog output. A passive filter receives the analog output and drives an analog compensation signal at an input of the INA.

The invention relates to the technical field of wireless communication networks, and provides a low-channel electroencephalogram amplification circuit and brain-computer interface equipment oriented to an after-ear electroencephalogram signal, and the low-channel electroencephalogram amplification circuit comprises a dry electrode sensing module which is used for collecting an electroencephalogram signal; the front active amplification module comprises an operational amplifier circuit with high input impedance; the anti-aliasing filtering module is formed by cascading a multi-order passive filtering network and an active filtering circuit, is connected with the output end of the front active amplification module and is used for filtering high-frequency interference signals; the right leg driving feedback module comprises a programmable impedance adjusting circuit and a current limiting protection circuit, the right leg driving feedback module and the front active amplification module form a closed-loop feedback loop, and the output end of the right leg driving feedback module and the human body form a current loop through a protection resistor; the analog-to-digital conversion module adopts an integrated low-power-consumption analog front-end chip; a wireless transmission module; and the power supply management module provides independent power supply for the analog front-end chip, the operational amplifier circuit and the wireless transmission module.

Disclosed in the present invention is a high-dynamic capacitive digital microphone system based on electrostatic force feedback. The system comprises an MEMS microphone and an interface circuit chip thereof, wherein the interface circuit chip comprises a charge pump, an analog front end, an analog-to-digital conversion circuit, an amplitude detection module, an amplitude adjustment control module and a pulse density modulation module. In the present invention, the characteristic of the sensitivity being able to be adjusted by means of changing a bias voltage by a capacitive sensor is used, and a charge pump with an adjustable output voltage is used to provide electrostatic force feedback, thereby further expanding the adjustable range of a front-end gain, and also reducing requirements for the noise performance of a readout circuit. Therefore, the system in the present application has the characteristics of high dynamic range and high-precision quantization.

The invention relates to a battery management system for a vehicle starting battery, and the system comprises a battery pack which comprises a plurality of connected battery cell units; the analog front end sampling chip AFE is electrically connected with the battery cell unit and is used for acquiring state parameters of the battery cell unit; the MCU control unit is electrically connected with the analog front end sampling chip AFE; the charging and discharging first switching circuit is electrically connected between the battery pack and the load connecting end of the battery pack, and is electrically connected with the analog front end sampling chip AFE; the second charging and discharging switch circuit is electrically connected to the first charging and discharging switch circuit and electrically connected with the MCU control unit or the analog front end sampling chip AFE, and the MCU control unit is configured to control the first charging and discharging switch circuit and the second charging and discharging switch circuit to be switched on or switched off based on preset logic. According to the invention, the problems of large current impact and overcharge load throwing caused by power connection when a lithium battery is used as a starting battery are solved, and the reliability of the battery management system is improved.

In one embodiment, a first die comprises: a first die-to-die adapter to communicate with first protocol layer circuitry via a flit-aware die-to-die interface (FDI) and first physical layer circuitry via a raw die-to-die interface (RDI), where the first die-to-die adapter is to receive message information comprising first information of a first interconnect protocol; and the first physical layer circuitry coupled to the first die-to-die adapter. The first physical layer circuitry may be configured to receive and output the first information to a second die via an interconnect, the first physical layer circuitry comprising a plurality of modules, each of the plurality of modules comprising an analog front end having transmitter circuitry and receiver circuitry. Other embodiments are described and claimed.

The invention relates to the technical field of protection circuits, in particular to a voltage threshold dynamic detection earth leakage protection circuit and a circuit protection board. According to the technical scheme, the device comprises a differential current detection module which is used for collecting current difference signals of a live wire and a zero wire in real time; the dynamic threshold adjusting module is connected with the environment sensor and the processing module, and dynamically sets an electric leakage judgment threshold based on environment parameters and load current spectrum analysis; the time division multiplexing programmable analog front end is used for sequentially executing signal amplification, filtering and analog-to-digital conversion functions through time sequence control; the solid-state electronic switch breaking module responds to the electric leakage signal output by the processing module and realizes circuit breaking; and the self-checking and fault-tolerant module periodically generates analog leakage signals to verify the functional integrity of the system. The method adapts to environmental load change through dynamic threshold adjustment, improves signal processing efficiency through time division multiplexing, guarantees reliability of the system through self-checking fault tolerance, and realizes accurate and rapid leakage protection.

Systems and methods can facilitate wide broad-band IVUS for peripheral vascular applications with simultaneous improved resolution and penetration depth. A custom analog front end interface can withstand large voltages and recover to receive a sub-mV pulse from less than one mm away. The custom analog front end interface can be on an interface chip that can be sized to be integrated within a tip of the IVUS catheter to connect micro-cables within the IVUS catheter to the broad-band transducer. The interface chip can also include a dual-stage amplifier having a pulse mode configured to withstand voltage pulses greater than 30 VPP during pulsing and an echo reception mode configured to receive sub-mV echoes during echo reception.

The invention discloses an LPO wired receiver adopting adaptive CTLE based on a genetic algorithm, and the receiver comprises an analog front end, a data sampler, an edge sampler, an error sampler, a 1: 32 demultiplexer, a verification module, an eye pattern monitor, a genetic algorithm module, clock recovery logic, and a clock path. The eye pattern monitor is used for calculating the eye pattern closure degree according to the data of the data sampler and the error of the error sampler and outputting the eye pattern closure degree to the genetic algorithm module; and the genetic algorithm module is used for realizing parameter adaptive control of a continuous time linear equalizer CTLE and a variable gain amplifier VGA in the analog front end. The invention aims to apply the genetic algorithm to the adaptive equalization of the adaptive continuous time linear equalizer, so that the adaptive continuous time linear equalizer has stronger global search capability and lower power consumption and is not easy to fall into local optimum, and the complexity and power consumption of the adaptive continuous time linear equalizer are reduced. And the real-time and energy-saving requirements are met.

The invention discloses an active pen and touch screen interaction system resistant to common-mode interference and a signal demodulation method. The system comprises a signal receiving terminal and a signal transmitting terminal. The signal transmitting terminal modulates data to be transmitted by adopting a differential binary phase shift keying modulation method, and transmits a generated modulation signal to the signal receiving terminal; the analog front-end receiving module is coupled with the signal transmitting terminal, receives the modulation signal and outputs a digital square wave signal after fidelity extraction processing; and the digital demodulation processing module performs differential coherent digital demodulation on the digital square wave signal based on the prior characteristics of the modulation signal, inhibits residual noise and recovers data to be sent. The analog front end focuses strong common-mode noise suppression and analog filtering, the digital demodulation algorithm performs secondary digital purification by using signal time sequence characteristics, and the two constructs an efficient anti-interference pipeline. Meanwhile, the regular square wave signals can be directly processed through differential coherent demodulation, and the requirements for performance and power consumption of a rear-end processor are lowered.

A capacitance measurement circuit includes an analog front-end (AFE) circuit with current mirror circuits, a parasitic capacitor, an AD converter, an output shift register, and a controller. The controller disconnects a capacitor to be measured and connects one current mirror circuit to record an AFE output voltage VN collected at an inverting input terminal of the AD converter, then connects the capacitor to be measured to collect an AFE output voltage VP at a non-inverting input terminal of the AD converter, and converts a value of (VP−VN) into a first digital signal; determines, based on the value of the first digital signal, a connection number m of the current mirror circuits, controls the analog front-end circuit to connect m current mirror circuits, and repeat the steps to obtain a second digital signal; and shift the second digital signal based on the connection number m to obtain a capacitance measurement value.

The invention discloses an electric blanket control method and system based on AI voice interaction, and the method comprises the steps: collecting a noisy voice signal through a microphone array, carrying out the filtering of an analog front-end circuit, the echo elimination of an AEC chip, and the noise reduction of a DSP, and obtaining a high-signal-to-noise-ratio pure voice. The AI or voice recognition chip extracts features and matches the features with a pre-stored template, and the master control MCU drives the voltage regulation circuit to regulate the heating power according to an instruction through PWM (Pulse Width Modulation). And dynamically adjusting the power of each region according to the temperature difference by using a closed-loop control algorithm according to ergonomic partitioning. The intelligent electric blanket solves the problems that a traditional electric blanket is inconvenient to operate, inaccurate in temperature adjustment and lack of effective safety protection, and an existing intelligent electric blanket is insufficient in voice interaction function, convenient voice control, accurate partition temperature control and comprehensive safety protection are achieved, and the user experience is 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 discloses a wearable electrocardiogram monitoring method based on composite lead and intelligent reconstruction. Belongs to the technical field of medical signal processing and wearable medical instruments, and solves the technical problems of insufficient multi-lead information amount, poor lead stability, motion artifact interference, unreliable missing lead complementation and the like of the existing wearable electrocardio equipment. According to the technical scheme, the method comprises the steps that a plurality of non-inductive electrodes are arranged on a trunk to achieve multi-channel collection of composite leads; the front end uses an analog front end (AFE); multi-stage denoising is carried out cooperatively at the equipment end and the edge end; when the lead is missing or poor in quality, complementing the lead by using a deep reconstruction network of cross-lead attention and fuzzy gating; and finally, inputting the purified or reconstructed electrocardiosignal into a multi-label deep learning classifier. According to the method, the wearing comfort, the information integrity, the transmission efficiency and the real-time diagnosis capability are considered, and the method is suitable for multi-scene long-time electrocardiogram monitoring and early warning in families, hospitals, exercise rehabilitation and the like.

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

The invention relates to the technical field of wireless communication and signal processing, in particular to a short-wave spectrum efficient sampling method and system based on compressed sensing, and the method comprises the steps: collecting full-band power spectrum density data through a low-speed scanning receiver; determining a strong interference frequency point set; generating a binary null observation sequence; loading the binary null observation sequence to an analog front-end frequency mixing circuit, performing analog domain orthogonal frequency mixing and integral processing on the input radio frequency signal, and outputting a voltage sampling value; resolving to obtain a signal sparse coefficient through a compressed sensing reconstruction algorithm; calculating a reconstruction residual error according to the voltage sampling value and the signal sparse coefficient; in response to the condition that the reconstruction residual error is greater than a preset error threshold, triggering a reacquisition process of the power spectral density data; outputting a signal sparse coefficient in response to the condition that the reconstruction residual error is smaller than or equal to a preset error threshold; according to the invention, the problems of limited dynamic range and weak signal submerging are solved, and the receiving sensitivity of weak signals in a strong interference environment is obviously improved.

The present disclosure provides an imaging device capable of outputting a signal other than an event detection signal, such as a pixel signal at a gradation level. The imaging device has a stacked chip structure formed by stacking at least two semiconductor chips including a first-layer semiconductor chip and a second-layer semiconductor chip. The first-layer semiconductor chip has a pixel array unit in which an event pixel that outputs an event detection signal, and a distance measurement pixel are mixed. The second-layer semiconductor chip is provided with an analog front-end unit for an event pixel that processes the event detection signal and with an analog front-end unit for a distance measurement pixel that processes the signal from the light-receiving element, corresponding to each of the event pixel and the distance measurement pixel.

The invention discloses a digital gain control method and system for power grid dual-mode communication, and belongs to the technical field of communication. The system comprises an analog front-end module, a digital system module and a synchronous system module; the analog front-end module comprises a programmable gain amplifier and a digital-to-analog converter; the digital system module comprises a digital filtering module, a left shift amplifier, a data stack, a bidirectional shift amplifier, a first data path selector, a second data path selector, a core control module and a processor; after a received signal is processed by the analog front-end module, a quantized digital signal obtained after processing is transmitted to the digital system module, and finally data processed by the digital system module is output to the synchronous system module, so that digital gain control of communication is completed. The technical problems of poor signal data consistency and poor stability in a digital gain control process in the prior art are solved.

The invention discloses an AFE analog front-end circuit applied to a multi-channel high-speed optical receiver. The circuit comprises an SF-TIA, a single-ended to differential circuit and a CLTE. The SF-TIA, the single-ended to differential circuit and the CLTE are connected in sequence; the SF-TIA is used for converting an input current signal into a voltage signal and transmitting the voltage signal to the single-ended to differential circuit; wherein the current signal is obtained by converting an input optical signal; the single-ended to differential circuit is used for converting the voltage signal into a differential voltage signal and transmitting the differential voltage signal to the CLTE; and the CLTE is used for compensating the high-frequency gain of the differential voltage signal to obtain a compensated voltage signal and outputting the compensated voltage signal. The amplifier has the advantages of being high in gain, low in power consumption, low in input impedance, low in noise, low in requirement for power supply voltage and simple in structure.

The invention discloses an embedded brain-computer semantic recognition system and method. The system comprises an analog front-end module, a processing module and a display module, the analog front-end module comprises a power management module, a low-pass filtering module and an analog-to-digital conversion module; the processing module comprises a signal acquisition unit, a signal decoding unit, a storage unit and a logic control unit; the signal acquisition unit receives the electroencephalogram signal output by the analog-to-digital conversion module; the storage unit is used for storing the collected electroencephalogram data; the signal decoding unit performs feature extraction and recognition on the electroencephalogram signals; and the logic control unit is used for executing a corresponding task according to the identification result output by the signal decoding unit. According to the system, effective capture and preprocessing of the electroencephalogram signals are achieved through the analog front-end module, and the system adult cost is reduced. According to the invention, the signal acquisition and decoding processes are integrated in mobile processing, and the electroencephalogram data are directly transmitted by adopting an inter-process communication mechanism, so that the real-time performance and accuracy of signal processing are ensured.

The invention discloses a high-precision magnetic field data acquisition unit for aeromagnetic measurement and an acquisition method thereof, belongs to the technical field of aeromagnetic measurement, and solves the problems that the acquisition resolution of an aeromagnetic measurement magnetic field is low, the measurement precision is influenced by a power supply and electromagnetic interference, and the data processing and storage reliability is insufficient. According to the invention, a framework of'acquisition module + control module 'is adopted, the acquisition module realizes high-precision sampling through low-noise power supply, differential reference and analog front-end full-link conditioning, the control module completes error compensation and aeromagnetic compensation through a Zynq core, and the 1nT-level magnetic field acquisition precision is achieved by matching an anti-interference design and stable storage and transmission. The 1nT-level magnetic field acquisition precision in the aeromagnetic measurement process is achieved, the signal acquisition precision and stability are remarkably improved, electromagnetic and power interference is effectively inhibited, the reliability of data processing, storage and transmission is guaranteed, and the strict requirements of aeromagnetic measurement for precision and interference resistance are met.

The invention discloses an electroencephalogram signal acquisition system and method, a storage medium and electronic equipment, and relates to the technical field of data processing.The system comprises an analog front end, a microcontroller and a wireless module; the analog front end is used for collecting an EEG analog signal and processing the EEG analog signal to obtain an EEG digital signal; the microcontroller is used for converting the EEG digital signal into electroencephalogram data; and the wireless module is used for transmitting the electroencephalogram data to an upper computer through the Wi-Fi module. Compared with the prior art, the system has the advantages that the analog front end 11 can be used for collecting EEG analog signals, converting the EEG analog signals into EEG data signals and transmitting the EEG data signals to the microcontroller 12, the microcontroller 12 is used for processing the EEG data signals and generating electroencephalogram data, and finally the wireless module 13 is used for sending the electroencephalogram data to the upper computer. The activity range of the user is expanded, and the convenience of electroencephalogram signal collection is improved.

The various implementations described herein include techniques and apparatuses for multi-channel biopotential signal acquisition, biopotential signal pre-processing, and adaptive signal conditioning. In one aspect, an analog frontend circuit includes an instrumentation amplifier (INA) and an analog-to-digital circuit (ADC) in a forward signal path. A digital circuit receives input from the ADC. An adaptive baseline tracking and compensation circuit tracks and compensates moving motion artifact driven changes. A power line interference (PLI) detection and compensation circuit tracks a desired number of PLI harmonics, and magnitude, phase and frequency for the PLI harmonics in real time. A digital-to-analog converter (DAC) circuit combines output of the adaptive baseline tracking and compensation circuit and the PLI detection and compensation circuit to output an analog output. A passive filter receives the analog output and drives an analog compensation signal at an input of the INA.

The utility model relates to the technical field of electric vehicles, in particular to a battery module controller and a battery pack. The battery module controller comprises a flexible circuit board and a battery cell monitoring controller; the battery cell monitoring controller comprises a printed circuit board and an analog front-end chip integrated on the printed circuit board; the flexible circuit board is connected with the printed circuit board, and the flexible circuit board is used for collecting temperature information and voltage information of the battery module and transmitting the collected temperature information and voltage information to the analog front-end chip for processing through the printed circuit board. According to the battery module controller and the battery pack, the problems that in a CMC system layout in an existing scheme, the whole CMC occupies a large space, the surface utilization rate of a PCB is not high, production waste is too much, and the weight of the PCB is large are solved.

The invention discloses an attenuation compensation method and system for a signal transmission function in an analog-to-digital converter, and relates to the technical field of analog-to-digital converter circuit design and signal processing, and the method comprises the steps: setting the attenuation gain of an integrator, and carrying out the pre-attenuation processing of an analog signal in an analog domain of the integrator; performing analog-to-digital conversion on the pre-attenuated signal through a quantizer, and outputting a digital code stream; and performing gain compensation on the digital code stream in the digital domain, and constructing a digital domain recovery path corresponding to the analog domain attenuation parameter. Through the analog front end of the sigma-delta analog-to-digital converter, overload distortion, modulator instability or modulation out-of-control caused by the fact that a signal peak value exceeds a dynamic range of a quantizer is avoided, the system stability is improved, high-precision analog-to-digital conversion of a controlled amplitude signal is realized, a corresponding gain compensation factor is set according to an analog domain attenuation parameter, and the gain compensation precision is improved. Linear recovery processing of a low-amplitude digital signal is realized, and attenuation introduced by an analog domain is compensated.

An analog frontend architecture for a capacitive pressure sensor. The analog frontend architecture includes a low-noise amplifier unit for low-noise amplification of sensor signals of the capacitive pressure sensor, the low-noise amplifier unit including a first integrator unit and a second integrator unit, the first integrator unit being connected to input terminals of the low-noise amplifier unit, being designed as a boxcar integrator, and being configured to amplify sensor signals of the capacitive pressure sensor according to the boxcar integration technique, and the second integrator unit being connected to output terminals of the low-noise amplifier unit and being configured to integrate the amplified voltage signals of the first integrator unit.