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200 results about "Transimpedance amplifier" patented technology
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In electronics, a transimpedance amplifier, (TIA) is a current to voltage converter, almost exclusively implemented with one or more operational amplifiers. The TIA can be used to amplify the current output of Geiger–Müller tubes, photo multiplier tubes, accelerometers, photo detectors and other types of sensors to a usable voltage. Current to voltage converters are used with sensors that have a current response that is more linear than the voltage response. This is the case with photodiodes where it is not uncommon for the current response to have better than 1% nonlinearity over a wide range of light input. The transimpedance amplifier presents a low impedance to the photodiode and isolates it from the output voltage of the operational amplifier. In its simplest form a transimpedance amplifier has just a large valued feedback resistor, Rf. The gain of the amplifier is set by this resistor and because the amplifier is in an inverting configuration, has a value of -Rf. There are several different configurations of transimpedance amplifiers, each suited to a particular application. The one factor they all have in common is the requirement to convert the low-level current of a sensor to a voltage. The gain, bandwidth, as well as current and voltage offsets change with different types of sensors, requiring different configurations of transimpedance amplifiers.
MEMS resonator low ripple error temperature measurement system based on voltage feedback compensation
PendingCN121740273AThermometers using electric/magnetic elementsUsing electrical meansConvertersSoftware engineering
The invention discloses an MEMS resonator low ripple error temperature measurement system based on voltage feedback compensation, and the system comprises a trans-impedance amplifier, an analog-to-digital converter, a frequency detection module, a PI controller, a variable gain amplifier, a Schmitt trigger, a first digital-to-analog converter, a biasing circuit, mode switches S1 and S2, and a voltage feedback compensation loop. The compensation loop comprises an amplitude detection module, a lookup table, a second digital-to-analog converter and an adder; the amplitude detection module receives the digital signal from the analog-to-digital converter and outputs a vibration amplitude signal in real time; the lookup table receives the vibration amplitude signal, inquires and outputs a corresponding digital compensation voltage, and converts the digital compensation voltage into an analog voltage through a second digital-to-analog converter; the adder adds the analog voltage and a fixed bias voltage to generate a dynamic bias voltage and applies the dynamic bias voltage to a drive electrode of the MEMS resonator. According to the system, an amplitude-driving end bias voltage feedback compensation loop is introduced, so that the periodic ripples of the resonant frequency are effectively suppressed.
Owner:SHANGHAI JIAOTONG UNIV
Germanium-silicon photoelectric detector array-based global self-defined sampling method
PendingCN122069437AFinal product manufacturePhotometry using electric radiation detectorsConvertersDetector array
The invention relates to the technical field of photoelectric detection, in particular to a global self-defined sampling method based on a germanium-silicon photoelectric detector array, which comprises the following steps of: S1, constructing the germanium-silicon photoelectric detector array with an n * t specification, receiving a target optical signal by using each detector unit as a pixel point, converting the target optical signal into an initial current signal, the signal is linearly amplified into a voltage signal through an external transimpedance amplifier; s2, digitalizing the voltage signal into a binary discrete digital signal through a high-speed analog-to-digital converter at the output end of the trans-impedance amplifier; and S3, performing global synchronous sampling to obtain a first group of data, performing repeated sampling in the same mode to obtain multiple groups of data, performing pixel-by-pixel superposition to generate fused data, and performing user-defined setting on the repeated sampling frequency within 1-1024 times. By customizing the number of repeated sampling times and data superposition, adapting to different light intensities and expanding the detection dynamic range, the problems of strong light overexposure and weak light underexposure are solved, the data consistency is guaranteed in combination with global synchronous sampling, and the detection precision and the environmental adaptability are improved.
Owner:JILIN UNIVERSITY
Electro-optical transmitter and receiver integrated circuit (core particle) for co-packaged optics and method of operation thereof
PendingCN121312299ACoupling light guidesOptical waveguide light guideElectro-absorption modulatorLaser light
An electro-optical integrated circuit comprising an optical transmitter and an optical receiver is disclosed in which a monolithically integrated electro-absorption modulated laser (EML) can operate bi-directionally in both transmitter and receiver modes. Vertically stacked waveguides for lasers and electro-absorption modulators (EAMs) are provided. The laser and the EAM are optically coupled through a transverse conical vertical optical coupler. The EML includes monolithically integrated electronic circuitry, such as drivers and control electronics for driving the laser as the EML and the EAM in the transmitter mode. The control circuit includes a transimpedance amplifier (TIA). The EAM has a first portion and a second portion that may be independently biased. In receiver mode, the laser current is reduced near a threshold, a first portion of the EAM is biased to absorb residual laser light, while a second portion of the EAM provides photocurrent to the TIA as a photodiode receiver.
Owner:ELECTROPHOTONIC IC INC
Wide-range switch tube leakage current detection method and system
ActiveCN121231973ACurrent/voltage measurementBase element modificationsDevice materialTransimpedance amplifier
The invention discloses a wide-range switch tube leakage current detection method and system, and relates to the technical field of semiconductor device detection, and the method comprises the steps: connecting a to-be-detected NMOS switch tube with a trans-impedance amplifier, and collecting the drain current; the trans-impedance amplifier converts drain current into an output voltage signal V. The switchable feedback resistor at least comprises two feedback branches corresponding to different ranges. When it is detected that the output voltage approaches a negative output saturation threshold, a corresponding gain range is switched; before each measurement period, an analog-to-digital converter is grounded through an analog switch, system offset voltage is sampled, and a digital compensation value of switch tube leakage current is calculated and compensated; rC low-pass filtering and software notch filtering are carried out on the compensated voltage signal, and then sampling is carried out; and comparing the sampling result with a preset threshold value, and outputting a leakage current detection result. According to the invention, the accuracy of the measurement result of the drain current of the NMOS transistor is improved, and the reliability of device performance evaluation is guaranteed.
Owner:BEIJING RUIHECHANG AEROSPACE TECH CO LTD
A design method of a multi-modal flexible sensor adaptive signal conditioning system
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.
Owner:王刚
Pulse wave signal detection-oriented transimpedance amplifier circuit with input voltage clamping and current offset functions
PendingCN121618942AAmplifier modifications to reduce noise influenceEvaluation of blood vesselsCircuit reliabilityHemt circuits
The invention discloses a pulse wave signal detection-oriented transimpedance amplifier circuit with input voltage clamping and current offset functions, and relates to the technical field of integrated circuit design, the pulse wave signal detection-oriented transimpedance amplifier circuit comprises a pseudo-differential structure, a current offset module and a photosensitive diode, the pseudo-differential structure is composed of two independent operational amplifiers with double-end input and single-end output, the trans-impedance amplifier of a pseudo-differential structure composed of two independent operational amplifiers with double-end input and single-end output is used, the same voltage is connected to the same-direction input end of the trans-impedance amplifier, voltage clamping is carried out on double-end input, the differential mode precision and low-frequency stability of an input virtual site are improved, differential mode imbalance and flicker noise caused by operational amplifier mismatch are eliminated, and the stability of the trans-impedance amplifier is improved. The dynamic range of the pulse wave detection system is improved, and the pulse wave detection system has the advantages of high-precision and wide-range ambient light suppression effect, high circuit reliability, low circuit complexity, easy implementation, high loop stability, small area and low power consumption.
Owner:CHONGQING UNIV
Reception module, operation method thereof and user equipment
The invention provides a receiving module, an operation method thereof and user equipment using the receiving module. The receive module includes a plurality of IF paths associated with the plurality of RF paths, at least one multiplexer (MUX), and at least one power detector (PD). Each IF path includes a transimpedance amplifier (TIA) and a low pass filter (LPF). The LPF is coupled to an output of the TIA. The at least one multiplexer is coupled to the plurality of IF paths. At least one power detector (PD) selectively couples at least two of the IF paths through at least one multiplexer to alternately detect signal strength of respective nodes between the TIA and the LPF in the respective IF paths. The at least two IF paths are associated with at least two RF paths of the plurality of RF paths having the same carrier frequency.
Owner:MEDIATEK INC
Circuit structure for realizing one-step solution of linear equation set based on memristor array
ActiveCN121765170BRealize signal transmissionImplement deploymentComplex mathematical operationsVoltage vectorIntegrator
The application belongs to the technical field of integrated circuits, and discloses a circuit structure for one-step solution of linear equations based on a memristor array, wherein the linear equations are Ax=b, and in the circuit, a first memristor array matrix operation core realizes mapping of the matrix A, takes a negative value of a first operation voltage vector as a bit line voltage, performs a matrix multiplication operation, reads a word line current as a first operation current vector after the operation, a bias mapping module maps b into a bias current vector, a current superposition module superimposes the first operation current vector and the bias current vector to generate a superimposed current vector, and converts the superimposed current vector into a second operation voltage vector through a transimpedance amplifier module, a second memristor array matrix operation core realizes mapping of the matrix A, takes the second operation voltage vector as a bit line voltage, performs a matrix multiplication operation, reads a word line current, and performs an integral operation on the word line current through an integrator module to obtain an updated first operation voltage vector. T The above hardware circuit can realize solution of the linear equations.
Owner:HUAZHONG UNIV OF SCI & TECH
Naked eye 3D virtual reality display system and method
The application is specifically a naked eye 3D virtual reality display system and method, and relates to the technical field of naked eye 3D display and virtual reality, comprising: a test pattern generation module; a photoelectric signal acquisition module; a signal phase analysis module; and a rendering parameter compensation module.In the application, the traditional external camera acquisition scheme is abandoned, a photosensitive sensor is attached to the inner side of a display module glass cover plate through optical glue, and a light shielding film and a frame wrapping design are matched, so that external environmental light can be isolated, signal distortion caused by environmental light reflection can be eliminated from the hardware structure; at the same time, a preprocessing circuit and the sensor are integrated at a zero distance, a tunable gain transimpedance amplifier band-pass filter is used to effectively filter out power frequency and high frequency noise, and a sinusoidal gray scale stripe design reduces spectral aliasing.
Owner:XIXIAN TECH CO LTD
Voltage sensing device with micro-electro-mechanical element
The invention relates to a voltage sensing device with a micro-electro-mechanical element. The voltage sensing device comprises a micro-electro-mechanical sensing element, a transimpedance amplifying circuit and a differentiating circuit, the micro-electro-mechanical sensing element is used for sensing an input voltage to generate a sensing current. The transimpedance amplification circuit is connected to the output end of the micro-electro-mechanical sensing element to receive the sensing current and convert the sensing current into an amplification voltage. The differentiating circuit is connected to the transimpedance amplifying circuit and used for receiving the amplified voltage and differentiating the amplified voltage to generate a differential signal, and the differential signal indicates whether the input voltage has a sudden change state or not and indicates the time point when the input voltage suddenly changes.
Owner:IND TECH RES INST
A method for manufacturing a micro-ring resonator-based activation function device
ActiveCN116151346BFinal product manufacturePhotomechanical exposure apparatusActivation functionTransimpedance amplifier
The application aims to provide a kind of micro-ring resonator-based activation function device manufacturing method, comprising the following steps: determining the standard nonlinear function to be fitted by optical device;Preparation of micro-ring resonator;Coupling ring PN junction and micro-ring;Set up auxiliary light source and output signal measurement equipment;Set up TIA transimpedance amplifier and bias unit.The application can realize the function of activation function by optical device, and it is relatively easy to combine with other optical elements that can realize the summation of neural unit weight, realize the complete function of single neuron, thereby improve the operation efficiency and operation accuracy of optical neural network.The device is small in size and easy to integrate, and the operation efficiency and operation accuracy of the optical neural network integrated by the neural unit integrated by the device can be significantly improved.
Owner:HARBIN ENG UNIV
A low noise hybrid domain CMOS detector readout circuit and readout method
The present application relates to the field of integrated circuits and photoelectric detection technology, in particular to a low-noise hybrid domain CMOS detector readout circuit.The circuit includes a capacitance feedback transimpedance amplification unit, a switched capacitor reference unit, an analog domain readout unit, a time domain quantization unit and an output selection unit.The transimpedance amplification unit converts the pixel current into voltage.The switched capacitor reference unit filters out the reference voltage noise in the reset stage and maintains the reference potential in the integration stage.The analog domain readout unit outputs analog voltage, and the time domain quantization unit outputs digital time code through saturation time detection.The output selection unit defaults to output analog signal, and switches to digital output when the transimpedance amplifier output voltage reaches the preset threshold.The present application also provides a corresponding readout method.The present application can effectively filter out the reference voltage source noise and power supply ripple, significantly improve the signal-to-noise ratio of micro-light detection, realize high dynamic range in a single frame, significantly expand the linear response range of the detector, and can be integrated on chip.
Owner:SHANGHAI INSTITUTE OF TECHNICAL PHYSICS CHINESE ACADEMY OF SCIENCES
magnetic field sensor
PendingJP2025539382AAcceleration measurementMagnetic property measurementsTransimpedance amplifierPhotodiode
The differential detection system (1) includes an optically trapping diamond nitrogen-vacancy doped layer (2) with an adjacent microwave resonator (4) having a resonant frequency with an operating bandwidth around the magnetic resonance of the nitrogen vacancy center. The microwave resonator (4) includes a suppressed portion (4B) and an unsuppressed portion (4A). A sensor photodiode (6A) is positioned distal to the doped layer (2) and aligned with the unsuppressed portion (4A) of the microwave resonator (4). A reference photodiode (6B) is spaced from the sensor photodiode (6A) and is substantially coplanar with the sensor photodiode (6A), while also aligned with the unsuppressed portion (4A) of the microwave resonator (4). The sensor (6A) and reference photodiode (6B) are connected back-to-back to a single transimpedance amplifier.
Owner:THE UNIV OF SYDNEY
A wideband full-duplex receiver sharing interference cancellation circuitry
The present application belongs to the technical field of radio frequency microwave integrated circuit design, and specifically relates to a wideband full duplex receiver sharing an interference cancellation circuit. The full duplex receiver of the present application is composed of a receiver module and an interference cancellation circuit. The receiver comprises a transconductance, a mixer, a transimpedance amplifier and a frequency conversion loop. The interference cancellation circuit comprises an input matching network, an input down-mixer, a quadrature selection phase shifter and a baseband variable gain low-pass filter. The interference cancellation circuit transfers the adjustment of the delay and gain in the radio frequency domain to the baseband, so that the overall area and power consumption are small, and the delay amount of 3.86-8.33 ns can be realized in a wide radio frequency band of 0.5-3.5 GHz. Meanwhile, the interference cancellation circuit is synthesized by the mixer in the frequency conversion loop of the receiver to form a double-path cancellation mode, which avoids the interference cancellation circuit being directly connected to the front end of the receiver module, and the noise figure deterioration of the receiver module is very small, only 0.9-1.2 dB.
Owner:FUDAN UNIVERSITY
Wide dynamic range signal acquisition method and circuit
PendingCN121864068Aimprove accuracyQuantitative results are accurate and reliableMultiple input and output pulse circuitsComponent separationTarget signalSoftware engineering
The embodiment of the invention provides a wide dynamic range signal acquisition method and circuit, and the method comprises the steps: a quadrupole is connected with an ion receiving electrode, the ion receiving electrode is connected with a transimpedance amplifier circuit, the transimpedance amplifier circuit is connected with a threshold comparison circuit, the threshold comparison circuit is connected with a D trigger circuit, and the D trigger circuit is connected with a dead time correction circuit. The lower computer FPGA is connected with the D flip-flop circuit; the quadrupole is used for screening ion signal output; the ion receiving electrode is used for converting the ion signal into a current signal; the transimpedance amplifier is used for converting the current signal into a voltage signal; the threshold comparison circuit is used for turning the voltage signal into a logic level; the D flip-flop circuit is used for outputting a target signal level matched with the lower computer FPGA; and the lower computer FPGA is used for receiving the target signal level and counting the signals acquired by the plurality of pulses through the dead time correction circuit. In this way, the phenomenon of counting omission under high-frequency signals is reduced, and the counting accuracy is improved.
Owner:GUANGZHOU HEXIN INSTR CO LTD
Self-oscillating class-d amplifier device
PendingUS20260100682A1Amplifier modifications to reduce non-linear distortionLow frequency amplifiersAudio power amplifierClassical mechanics
The present disclosure relates to an amplifier device for amplifying an input signal Sx at a device input X to an output signal Sy at a device output Y, for driving a loudspeaker or comparable reactive load, comprises a self-oscillating Class D power amplifier stage with transfer function KA(s). The amplifier stage includes a comparator, a power stage, and a second-order low-pass output filter comprising an inductor and a capacitor. A time delay unit provides a delay determined by one or more of the comparator, the power stage, and a first feedback filter. The output signal Sy is fed back to the comparator via the first feedback path to establish oscillation and provide basic low-frequency feedback. A correction stage is provided, comprising a second feedback path that feeds the output signal Sy, via a scaling resistor, to a virtual ground input of a transimpedance amplifier.
Owner:HYPEX HOLDING BV
A high-transient-response ldo for gaN half-bridge driver power supply
The application relates to the technical field of low dropout linear voltage stabilizers, in particular to a high-transient-response LDO for GaN half-bridge driver power supply, which comprises a band gap reference, an error amplifier EA, a power adjustment tube MP, a feedback resistance network, an adaptive bias circuit, a transimpedance amplifier and a dynamic swing rate enhancement circuit. Through the double mechanisms of adaptive bias and dynamic swing rate enhancement, the application can timely respond to the nanosecond-level load current mutation generated by the GaN driver, has the characteristics of high stability and low static power consumption, and is beneficial to improving the robustness of the whole power converter system.
Owner:NO 24 RES INST OF CETC
An optical power harvesting device and method
The application discloses an optical power collection device and method, relates to the technical field of optical signal detection, and comprises the following: a photoelectric detector for converting an optical signal into a current signal; a transimpedance amplifier for converting the current signal into a pulse voltage signal; a peak detector for detecting the peak value of the pulse voltage signal; an RC filter network for filtering noise of the pulse voltage signal; a low-frequency amplifier for amplifying the low-frequency pulse voltage signal; an ADC collection module for converting the amplified pulse voltage signal into a digital signal; a first feedback network for adjusting the gain of the transimpedance amplifier; a second feedback network for adjusting the gain of the low-frequency amplifier; and a microcontroller for controlling the first feedback network to adjust the gain of the transimpedance amplifier according to the peak value of the pulse voltage signal and for controlling the second feedback network to adjust the gain of the low-frequency amplifier according to the digital signal.
Owner:ZHUHAI GUANGHENG TECH CO LTD
Control method for acquiring narrow linewidth laser signal
The invention discloses a control method for acquiring a narrow linewidth laser signal. The method comprises the following steps: transmitting output light of a laser to a runway type micro-ring resonator introduced with a fine adjustment structure through a spot size converter and a normally closed variable optical attenuator in sequence; feedback light generated by the runway type micro-ring resonator with the introduced fine adjustment structure is fed back to the laser through the normally-closed variable optical attenuator and the spot size converter in sequence; a random parallel gradient descent algorithm is adopted, the sampling voltage of the trans-impedance amplifier serves as a performance index, cooperative control is conducted on the first working voltage of the first phase shifter and the second working voltage of the second phase shifter integrated on the normally-closed variable optical attenuator, and a narrow linewidth laser signal is obtained. According to the invention, the problems of low efficiency and slow response speed during acquisition of narrow linewidth laser signals in the prior art are solved.
Owner:CHONGQING UNIV
A fast response RSSI circuit, a high-speed burst mode transimpedance amplifier chip and an optical receiving module
PendingCN122092813AElectromagnetic transmissionDifferential amplifiersReference currentHemt circuits
This invention relates to a fast-response RSSI circuit, a high-speed burst-mode transimpedance amplifier chip, and an optical receiver module, belonging to the fields of integrated circuits and optical communication. The invention addresses the problems of traditional optical receiver modules relying on external, independent high-voltage sample-and-hold chips to monitor APD photocurrent, resulting in large PCB area, high system cost, low integration, and complex R&D and debugging. The RSSI circuit described in this invention is integrated within the transimpedance amplifier chip and manufactured using the same constant-voltage process. It includes: a transimpedance amplification and monitoring unit providing a monitoring differential voltage proportional to the input photocurrent; an integral feedback control unit generating a global control voltage; a dynamic current allocation unit adaptively allocating a reference current in response to the global control voltage; a DC component management unit extracting the DC component of the input node; a bias calibration unit eliminating fixed bias components; and a signal output unit outputting a received signal strength indication signal proportional to the input photocurrent.
Owner:QIANDU TONGCHIP XIAMEN MICROELECTRONICS TECH CO LTD
Cascaded and cross-coupled bandwidth trans-impedance amplifier for visible light communication
PendingCN121984460AAmplifier modifications to reduce non-linear distortionAmplifiers controlled by lightSoftware engineeringHemt circuits
The invention discloses a cascade and cross-coupling bandwidth trans-impedance amplifier for visible light communication, which adopts a fully differential topological structure and consists of a cascade enhanced input stage, an active current source load and a cross-coupling bandwidth compensation network, an enhanced feedback loop is constructed in a multi-stage cascade mode; a multi-stage common-source amplifier is connected in series in a feedback path of an input end; replacing a traditional resistive load with a current source: replacing a common-gate load resistor with the current source; the differential output end of the circuit is connected with a pair of cross coupling transistors, and the grid electrodes and the drain electrodes of the transistors are connected in a cross mode to form a positive feedback mechanism. The invention provides a novel RGC-TIA structure adopting optimized bias and cascade feedback, and by breaking through voltage margin limitation, high gain, wide bandwidth and good linearity and common-mode rejection performance are realized at the same time.
Owner:TIANJIN UNIV
An on-chip integrated transient-enhanced LED driving circuit
The application discloses a kind of on-chip integrated transient enhanced LED drive circuit, belong to power supply technical field.The circuit is applied to optical isolation system, optical isolation system utilizes light emitting diode (LED) and photodiode (PD) to realize electrical isolation, control end generates signal control LED light emitting, receiving end utilizes PD and converts optical signal into current signal, and voltage signal is amplified by transimpedance amplifier (TIA), and subsequent module processing.Due to the existence of large parasitic junction capacitor of LED, in the process of controlling switch LED, the charge and discharge of parasitic junction can affect the opening speed of LED, and further affect the overall transmission delay of optical isolation system.A kind of transient enhanced LED drive circuit proposed in this paper provides transient current in the moment of opening LED, accelerates the opening of LED.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Transimpedance amplifier
PendingCN122137351AAmplifier modifications to reduce noise influenceDifferential amplifiersAudio power amplifierSoftware engineering
This application relates to a transimpedance amplifier circuit, comprising a front-end amplifier that receives an input current and outputs a corresponding voltage, and a processing stage configured to process the voltage output from the front-end amplifier. The application also relates to an amplifier circuit where the processing stage has a filter having a frequency response with a local minimum. The transimpedance amplifier circuit can be used to process signals including data within a data band, and the filter can be configured such that the local minimum occurs within that data band. The filter response at least partially compensates for resonance peaks in the frequency response of the front-end amplifier caused by anticipated resonance at the input of the front-end amplifier.
Owner:SEMTECH CORP
Optical burst mode receiver
PendingUS20250379660A1Multiplex system selection arrangementsElectromagnetic receiversSoftware engineeringTransimpedance amplifier
An optical burst mode receiver and methods of operation are disclosed. The optical burst mode receiver may comprise means for determining a first parameter associated with a first transimpedance amplifier, TIA, in response to the first TIA receiving a first burst mode signal, means for determining a configuration setting for at least a second, different, TIA based at least in part on the first parameter; and means for configuring at least the second TIA, for receiving a second burst mode signal, based at least in part on the configuration setting.
Owner:NOKIA SOLUTIONS & NETWORKS OY
A wide-range switch tube leakage current detection method and system thereof
ActiveCN121231973BCurrent/voltage measurementBase element modificationsA d converterComputational physics
This application discloses a wide-range leakage current detection method and system for switching transistors, relating to the field of semiconductor device testing technology. The method includes connecting the NMOS switching transistor under test to a transimpedance amplifier to acquire its drain current; the transimpedance amplifier converts the drain current into an output voltage signal V; the switchable feedback resistor includes at least two feedback branches corresponding to different measurement ranges; when the output voltage approaches a negative output saturation threshold, the corresponding gain range is switched; before each measurement cycle, the analog-to-digital converter is grounded via an analog switch, the system offset voltage is sampled, and a digital compensation value for the switching transistor's leakage current is calculated and compensated; the compensated voltage signal is subjected to RC low-pass filtering and software notch filtering before sampling; the sampling result is compared with a preset threshold, and the leakage current detection result is output. This application improves the accuracy of NMOS transistor drain current measurement results and ensures the reliability of device performance evaluation.
Owner:BEIJING RUIHECHANG AEROSPACE TECH CO LTD
Double-path transimpedance amplifier based on blocking capacitor
PendingCN121036704AWave based measurement systemsNegative-feedback-circuit arrangementsCapacitanceVoltage pulse
The invention belongs to the technical field of blocking capacitor matching of double transimpedance amplifiers, and discloses a blocking capacitor-based double-path transimpedance amplifier, which comprises a direct current leakage circuit module for receiving light current input from a reverse bias APD (avalanche photodiode) and converting the light current input into a current pulse signal for output; the two blocking capacitors are respectively coupled to the output end of the direct-current bleeder circuit module, receive current pulse signals output by the direct-current bleeder circuit module and respectively transmit the signals to the two negative feedback trans-impedance amplifiers which are connected in parallel; the two negative feedback type transimpedance amplifiers are connected in parallel and respectively receive the current pulse signals from the corresponding blocking capacitors and convert the current pulse signals into voltage pulse signals; and the signal fusion amplifier receives the voltage pulse signal, carries out fusion processing and then outputs a final voltage pulse signal. By means of the two blocking capacitors, the effect of resisting APD process changes is achieved, and meanwhile the core performance of the whole circuit can be adjusted by adjusting the specific value of the two capacitors.
Owner:SOUTH WEST INST OF TECHN PHYSICS
High-gain low-noise distributed fiber vibration sensing system signal processing device and method
The application relates to the technical field of distributed optical fiber sensing systems, in particular to a high-gain low-noise distributed optical fiber vibration sensing system signal processing device and method, which is provided with a 2*2 coupler, two PIN photoelectric diodes, two AC filtering circuits, two transimpedance amplification circuits, a signal difference unit and a signal demodulation unit, the two transimpedance amplifiers realize conversion of a current signal into a voltage signal; the input end of the transimpedance amplifier is connected with an AC module, and the output end is connected with the signal difference unit; compared with the prior art, the two transimpedance outputs are combined with the AC filtering circuit, so that the range of the electric signal obtained through photoelectric conversion is increased, the input optical signal is fully utilized, the output signal is increased, the signal-to-noise ratio of the system is significantly improved, and the system measurement capability is enhanced.
Owner:WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH
Acquisition device to limit leakage current in electrophysiological signal recording devices
ActiveUS12622624B2Amplitude demodulation by non-linear multiple-pole elementsSensorsTransimpedance amplifierVoltage source
The device limits the leakage current in an electronic system for recording electrophysiological signals, where the transducer element is an active device, the device comprising an active transducer (1), intended to contact a human tissue, connected to a transimpedance amplifier (2), and a first resistor (6) connected parallel to the transimpedance amplifier (2), an alternate voltage source (7) and a direct voltage source (8), both connected to the active transducer (1), a first capacitor (3) connected between the alternate voltage source (7) and the active transducer (1), a second resistor (4) connected between the direct voltage source (8) and the active transducer (1), parallel with the first capacitor (3) and the alternate voltage source (7), and a second capacitor (5), connected between the active transducer (1) and the transimpedance amplifier (2).
Owner:CONSEJO SUPERIOR DE INVESTIGACIONES CIENTIFICAS (CSIC) +3
Photoelectric receiving system and method
The invention discloses a photoelectric receiving system and method, and the system comprises a photodiode which is used for receiving an external optical signal and converting the external optical signal into an electric signal; the transimpedance amplifier is electrically connected with the photodiode and is used for converting the electric signal into a voltage signal and amplifying the voltage signal to obtain an amplified voltage signal; the coupler is connected with the output end of the trans-impedance amplifier and is used for filtering a direct-current component in the amplified voltage signal to obtain an alternating-current coupled voltage signal; the post-stage circuit is connected with the coupler and is used for performing digital signal conversion on the alternating current coupling voltage signal to obtain a target digital signal of the external optical signal; electric signals are converted into voltage signals through the trans-impedance amplifier and amplified, amplified voltage signals are obtained, current signals are converted into the voltage signals and amplified, and signal processing precision can be improved; the direct-current component in the amplified voltage signal is filtered through the coupler, and noise interference in the alternating-current component is reduced.
Owner:WUHAN GLORY ROAD PRECISION TECH CO LTD
Calibration techniques for alternating-current (AC)-coupled transceiver
A circuit includes a receiver coupled to an input node and includes a transimpedance amplifier (TIA). The input node is to be coupled to a transmitter over a channel. Calibration circuitry is coupled to the input node and to modify a resistance of a feedback resistor of the receiver by applying a plurality of control values. The calibration circuitry is to generate, for each applied control value, a first digital code for a direct current (DC) swing and a second digital code for an alternating current (AC) swing at the input node. The calibration circuitry is to determine a final control value of the plurality of control values that minimizes a difference between the first and second digital codes.
Owner:NVIDIA CORP