540 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 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 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.

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.

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.

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 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 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 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.

The invention discloses a coherent accumulation measurement method of an S-mode low-power signal and related equipment, and relates to the field of aviation communication signal measurement. Comprising the following steps: performing noise statistics and baseline calibration on digital I / Q sampling data filtered and amplified by an analog front end to obtain a noise mean value and a noise standard deviation; setting a detection threshold value based on the noise standard deviation, and performing sliding correlation on the net signal and the S-mode lead pulse reference template to capture the lead pulse; taking the capturing moment as a starting point, intercepting a preset-frame-length signal sequence covering the S-mode leading pulse and the data segment from the net signal, and distinguishing an S-mode complete frame and an A / C-mode short pulse string through dual-threshold verification; and performing coherent accumulation on the I-path and Q-path sampling points in the complete frame according to a complex number form to obtain a coherent accumulation result, and calculating the average power of the S-mode low-power signal according to the coherent accumulation result. Accurate measurement of an extremely weak S-mode response signal can be realized under a noise background.

Provided in the present invention are a battery management system and method and an energy storage apparatus. The battery management system comprises micro-control units and a collection unit, wherein each micro-control unit is used for receiving and / or sending a control signal, the collection unit is used for collecting cell parameters, two ends of the collection unit are connected to the micro-control units, the collection unit comprises at least one cell management unit, each cell management unit is provided with an analog front end, each analog front end is used for connecting to one cell for collection of the cell parameters, there are two micro-control units and two cell management units, each cell management unit is connected to one micro-control unit, and the two micro-control units share parameter signals and the control signals. The battery management system of the present invention can manage each cell, so as to allow for more balanced workload of each component, thus reducing the risk of slave control failures; and the battery management system can fully use the two micro-control units, so as to make system operation safer and more reliable.

An analog front end (AFE) circuit including: a continuous time linear equalizer (CTLE) circuit; a transimpedance amplifier (TIA) connected to the CTLE circuit; and a feedback circuit including: a first transistor connected between a first output of the feedback circuit and a first node connected to a first current source; a second transistor connected between a second output of the feedback circuit and a second node connected to a second current source; and a first tunable resistor coupled between the first node and the second node, wherein: a first input of the feedback circuit is connected to a first output of the TIA; a second input of the feedback circuit is connected to a second output of the TIA; the second output of the feedback circuit is connected to a first input of the TIA.

According to an embodiment, a biopotential measurement system includes an analog front-end and digital circuits. The analog front-end circuit includes a sensing electrode, a forward amplifier, and a feedback amplifier with an integration capacitor. A feature is the attenuation circuit between the forward and feedback amplifiers, which provides an attenuation factor determining the integration capacitor's value for achieving the desired high-pass corner frequency. With configurable attenuation factors, the system can process different biopotential signals. Multiple analog front-end circuits can be used to process different signals simultaneously. The digital circuit includes a processor for signal processing, dynamic adjustment of attenuation factors, and anomaly detection. Additional components like switched capacitors, pseudo-resistors, and multiplexers can enhance the system's functionality. The design allows flexible, multi-parameter physiological monitoring with adjustable frequency responses and gain settings.

The invention discloses a real-time ultrafast ultrasonic image reconstruction system and method based on an FPGA, and the system comprises an analog front-end collection chip, the FPGA, and an upper computer which is used for transmitting collected multi-channel ultrasonic data to the FPGA through the analog front-end collection chip, receiving a control command sent by the FPGA, and transmitting the control command to the FPGA through the upper computer. And the FPGA performs data preprocessing, beam forming calculation and image post-processing on the multi-channel ultrasonic data, processes a received command and an external trigger signal, and uploads inter-board cascade communication and an image sampling and processing result to an upper computer for real-time display. According to the invention, real-time acquisition of high-channel ultrafast ultrasonic signals and medical ultrafast ultrasonic image reconstruction can be realized, equipment cascading is supported, the data processing speed is high, the bandwidth is high, the number of channels is large, the system can be expanded, real-time reconstruction can be directly carried out on an FPGA, and the ultrasonic image reconstruction rate is greatly improved.

The invention provides a wearable patch based on flexible ultrasonic sensing and a use method, and relates to the field of medical monitoring equipment. The sensor comprises a sensing module, a self-adaptive signal processing module and a wireless data transmission module which are packaged by a flexible material and form an integrated flexible packaging layer, the sensing module comprises an ultrasonic transducer array, and the ultrasonic transducer array comprises a plurality of ultrasonic transducers; an ultrasonic transducer; the adaptive signal processing module comprises a microprocessor, an analog front end and a digital signal processor. Through fusion of a flexible electronic technology and ultrasonic sensing, the technical limitation of traditional rigid equipment is broken through, wearable, continuous and non-invasive blood pressure and blood flow synchronous monitoring is achieved, and an important technical scheme is provided for cardiovascular health management, disease early diagnosis and personalized medical treatment.

The invention discloses a multi-channel ultra-wide-frequency-domain signal acquisition method and device. The method comprises the steps that signal sources of multiple channels are sent to the IN + end of an amplifier; the FPGA transmits the bias analog signal to the IN-end of the amplifier; a signal source and a bias analog signal are converted into differential signals, the differential signals are sent to an analog switch, and an FPGA configures a channel switching strategy and a measurement scheme of an ADC chip; the ADC performs analog-to-digital conversion on the differential signal and sends an obtained digital signal to the FPGA; the clock signal source provides a system clock and an equipment clock for the FPGA and the ADC; a multipurpose digital timing and triggering signal is connected with the analog front-end board card, and a generated synchronous sampling signal is sent to the FPGA; the FPGA synchronously acquires the voltage, current and power of alternating current and direct current in real time through the three-phase voltage and current acquisition unit; and sending the digital signal, the time node of the current sampling data and the temperature drift data to a data receiving end to complete multichannel ultra-wide frequency domain signal acquisition. The problem of measurement deviation caused by inconsistent gain of two channels of the module is solved, and the measurement precision is improved.

A bio-signal detection apparatus includes an analog front end unit includes a plurality of analog front end circuits that process a detected signal; an analog-to-digital conversion unit that converts an output signal of the analog front end unit to a digital code and a multiplexer (MUX) that outputs a processed signal by the analog front end circuits to the analog-to-digital conversion unit; wherein the analog digital conversion unit comprises: a comparator, a successive-approximate analog-to-digital converter (SAR ADC) that converts output signal of the analog front end circuit and form MSB side j-bit of the digital code, and a single slope ADC that converts the output signal of the analog front end circuit to k bit of the digital code.

A device includes a receiver analog front-end circuit including a path shared by an internal loopback current path and a calibration current path, wherein the receiver analog front-end circuit is configured to perform an internal test using the internal loopback current path while in a test mode, and equalize a first data signal while in a normal mode, the equalizing the first data signal including removing an offset from the first data signal using the calibration current path.

An equalizer circuit includes: an analog front end circuit configured to receive an analog input signal from a transmission line; an analog finite impulse response filter circuit including: a sample and hold circuit configured to sample an output of the analog front end circuit; and a weighting circuit configured to weight the output of the analog front end circuit to generate a feedforward signal; and a decision feedback equalizer circuit configured to receive an output of the analog front end circuit and the feedforward signal.

A pulse amplitude modulation 4-level (PAM-4) physical layer (PHY) serializer / deserializer (SerDes) receiver is provided. The receiver may include an analog-front-end (AFE) block to receive a transmit signal, an analog-to-digital converter (ADC) block to convert the transmit signal into a digital signal at sampling intervals defined by a sampling clock signal, a clock and data recovery (CDR) circuit to receive the digital signal from the ADC block and extract a recovered clock signal and a recovered data stream, the recovered data stream containing a sequence of symbols with amplitude values corresponding to four levels of PAM-4, a phase integrator (PI) to generate the sampling clock signal for the ADC block based on the recovered clock signal, and a feedforward phase correction (FFPC) block to receive the recovered data stream and generate a receive signal.