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456 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.
Transimpedance amplifiers for crossbar circuits
The present disclosure provides for transimpedance amplifiers for crossbar circuits. A crossbar circuit may include a plurality of bit lines intersecting with a plurality of word lines and a plurality of cross-point devices. Each of the plurality of the cross-point devices is connected to at least one of the word lines and at least one of the bit lines. The crossbar circuit may further include a transimpedance amplifier to generate an output voltage representative of a sum of currents flowing through a first bit line of the plurality of bit line. The transimpedance amplifier may include an operational amplifier, a current mirror circuit connected to an output of the operational amplifier, and one or more resistors connected to the current mirror circuit and a supply voltage.
Owner:TETRAMEM INC
Circuit and method for simultaneously switching transimpedances of multiple channels by adopting shifting register
PendingCN119543836Alow costAmplifier modifications to raise efficiencyIndividual particle analysisShift registerComputer architecture
The invention discloses a circuit for simultaneously switching transimpedances of multiple channels by adopting a shift register. The circuit is characterized in that an FPGA (Field Programmable Gate Array) is connected with a signal acquisition and conversion circuit module through an analog-to-digital converter and a clock generation and distribution module; the signal acquisition and conversion circuit module comprises a bias voltage setting module, a pi-type filter, a photoelectric sensor and a transimpedance amplification module which are connected in series; the input end of a transimpedance amplifier in the transimpedance amplification module is connected with a transimpedance gain access circuit, the transimpedance gain access circuit is connected with the output end of the transimpedance amplifier through an analog switch, and the control end of the analog switch is connected with the FPGA through a shifting register. According to the circuit and the method for simultaneously switching the transimpedances of the multiple channels by adopting the shift register, the transimpedance gain of the transimpedance amplifier is judged and switched according to the size of the signal, the range of the input signal is expanded, the resolution is improved, and the IO resources of the FPGA are saved and the cost is reduced by utilizing the storage function and the serial-parallel conversion function of the shift register.
Owner:ZHONGSHENG MEDICAL TECH (HEFEI) CO LTD
Trans-impedance amplifier device for optical receiver
PendingCN120498390ALogic circuits characterised by logic functionAmplifier modifications to raise efficiencyHemt circuitsTransimpedance amplifier
A transimpedance amplifier device for an optical receiver disclosed by the present invention comprises a bias circuit, a transimpedance amplifier and an amplification driving circuit which are connected in sequence, the bias circuit comprises an upper bias structure and a lower bias structure, and the upper bias structure and the lower bias structure are both connected with the transimpedance amplifier to generate different bias currents. It is ensured that the photodiode PD1 can be conducted and generate light current when light passes through the photodiode PD1, the transimpedance amplifier is used for converting the current into voltage to be output, and the amplification driving circuit is used for amplifying the voltage. According to the optical receiver circuit, micro current generated by the photodiode can be converted into output voltage in a relatively high output range through the transimpedance amplifier, and compared with a traditional optical receiver circuit, the optical receiver circuit is relatively low in cost in circuit structure and has the advantages of low power consumption and high reliability. The driving capability of the circuit can be improved under the condition that a complex amplifier loop and a photoelectric conversion module are not needed, the output voltage in a high range is output, and the performance and the stability are further enhanced.
Owner:SICHUAN HUIYUAN PLASTIC OPTICAL FIBER
Optical receiver comprising monolithically integrated photodiode and transimpedance amplifier
An optical receiver comprises a monolithically integrated pin photodiode (PIN) and transimpedance amplifier (TIA). The TIA comprises InP heterojunction bipolar transistors (HBT) fabricated from a first plurality of layers of an epitaxial layer stack grown on a SI:InP substrate; the PIN is fabricated from a second plurality of layers of the epitaxial layer stack. The p-contact of the PIN is directly connected to the input of the TIA to reduce PIN capacitance CPIN. The TIA capacitance CTIA may be matched to CPIN. Device parameters comprising: a thickness of the absorption layer, window area, and an optional mirror thickness of the PIN; device capacitance CPIN+CTIA; and feedback resistance RF of the TIA; are optimized to performance specifications comprising a specified sensitivity and responsivity at an operational wavelength. This design approach enables cost-effective fabrication an integrated PIN-TIA, for applications such as a 1577 nm receiver for an ONU for 10G-PON.
Owner:ELECTROPHOTONIC IC INC
Optical module
PCT designated stage expiredWO2025036291A1Fibre transmissionOptical power meterPhotovoltaic detectors
The present disclosure provides an optical module, comprising a coherent assembly for receiving local oscillator light and a first optical signal and performing coherent demodulation on the local oscillator light and the first optical signal. A reception photodetector generates a photo-generated current from the first optical signal. A transimpedance amplifier receives the photo-generated current and amplifies the photo-generated current to output a voltage signal. An analog-to-digital conversion sampler converts the voltage signal into an AD sampling value and transmits the AD sampling value to an MCU formula. The AD sampling value is substituted into a reference optical power formula to calculate a reference optical power value, and the current frequency value is substituted into a frequency deviation formula to calculate the current frequency deviation. The current frequency deviation is subtracted from the reference optical power value to obtain an optical power calculation value as a reported optical power.
Owner:HISENSE BROADBAND MULTIMEDIA TECH
Electro-photonic circuit comprising an optical receiver with optical gain control
PendingUS20250070886A1Solid-state devicesPhotonic quantum communicationElectro-absorption modulatorSemiconductor materials
An optical receiver comprises a variable optical attenuator (VOA), a photodiode (PD) which may be a pin-PD or an APD, a transimpedance amplifier (TIA), and a feedback / control circuit for adjusting a bias voltage of the VOA in response to an optical input signal level, to provide an attenuated optical output signal to the PD having a narrower dynamic range. Providing signal level adjustment in the optical domain mitigates the requirement for a TIA with a large dynamic range and provides for fast switching. The optical receiver may comprise a waveguide configuration, wherein a first electro-absorption modulator (EAM) is operable as the VOA and a second EAM is operable as the photodiode. A monolithically integrated electro-photonic circuit comprising the VOA, PD, TIA and feedback / control circuit may be provided using InP-based semiconductor materials.
Owner:ELECTROPHOTONIC IC INC
Differential differencing transimpedance amplifier for coherent applications
Techniques for implementing a differential differencing TIA for coherent applications are disclosed. A method includes receiving first and second optical signals from a 90 degree optical hybrid that receives a coherent optical signal, wherein the first and second optical signals each include one pair of sum and difference signals output by the 90 degree optical hybrid, generating, based on the first optical signal and from a first photo diode, a first differential signal, generating, based on the second optical signal and from a second photo diode, a second differential signal, differentially transconducting the first and second differential signals to produce first and second transconducted signals, performing a differencing operation on the first and second differential transconducted signals to produce a combined differential-differencing transconducted signal that is representative of the first optical signal and the second optical signal, and outputting the combined differential transconducted signal as a differential output.
Owner:CISCO TECHNOLOGY INC
Devices for digital-domain temperature compensation in logarithmic transimpedance amplifiers
PendingUS20250253809A1Logarithmic/exponential functionsAmplifier modifications to reduce temperature/voltage variationComputational physicsTransimpedance amplifier
Technologies are provided to calculate a logarithm of an input current to a logarithmic transimpedance amplifier device at a particular temperature. The logarithm of the current is calculated in digital domain based on sampling of analog signals that are internal to the logarithmic transimpedance amplifier device. The sampling can be performed, in some cases, by an analog-to-digital converter device integrated into the logarithmic transimpedance amplifier device. The calculation in digital domain is performed by one or more processor external to the logarithmic transimpedance amplifier device. The calculation includes a determination of a temperature compensation factor based on an internal analog signal indicative of temperature of the logarithmic transimpedance amplifier device. The temperature compensation factor permits removing temperature dependence from a logarithmic output voltage originating from the input current. Operating in the digital domain permits applying corrections that account for residual leakage current and an emitter-resistance correction at high input currents.
Owner:ANALOG DEVICES INC
Variable gain acquisition circuit applied to high-speed silicon optical module and optical module
The utility model relates to the technical field of optical communication, in particular to a variable gain acquisition circuit applied to a high-speed silicon optical module and an optical module, the high-speed silicon optical module comprises an MZM modulator, a main path monitoring diode and an auxiliary path monitoring diode of a tap output in an output optical path of the MZM modulator are connected with respective corresponding variable gain transimpedance amplification circuits, and the main path monitoring diode and the auxiliary path monitoring diode are connected with the corresponding variable gain transimpedance amplification circuits. The signal output end of the variable gain transimpedance amplification circuit is connected to the signal input end of the MCU through the analog-to-digital converter, and the signal output end of the MCU is connected to the signal input end of the MZM modulator through the digital-to-analog converter. According to the utility model, the variable gain transimpedance amplification circuit is utilized to monitor the main path monitoring diode MPDmain and the auxiliary path monitoring diode MPDsub of the tap output in the output light path of the MZM modulator in real time, stable and more accurate sampling can be realized under the condition of different current magnitudes, and the gain can be adjusted in real time according to the change condition of the sampling value.
Owner:EOPTOLINK TECH INC LTD
Optical module
The optical module provided by the invention is provided with a coherent component which is used for receiving local oscillation light and a first optical signal and carrying out coherent demodulation on the local oscillation light and the first optical signal. And the receiving photoelectric detector generates photo-generated current for the first optical signal. The trans-impedance amplifier receives the photo-generated current, amplifies the photo-generated current and outputs a voltage signal. The analog-to-digital conversion sampler converts the voltage signal into an AD sampling value and transmits the AD sampling value to an MCU formula, the AD sampling value is substituted into a reference optical power formula to calculate and obtain a reference optical power value, and the current frequency value is substituted into a frequency deviation formula to calculate and obtain the current frequency deviation. And subtracting the current frequency deviation from the reference optical power value to obtain an optical power calculation value as reported optical power.
Owner:HISENSE BROADBAND MULTIMEDIA TECH
Low-power-consumption broadband continuous time linear equalizer
PendingCN119561497ASimple structurereduce power consumptionModulation transference balanced arrangementsCapacitanceHemt circuits
The invention discloses a continuous time linear equalizer which comprises a transconductance circuit, a transimpedance amplifier circuit and a common-mode voltage feedback circuit. The transconductance circuit comprises a pair of PMOS (P-channel Metal Oxide Semiconductor) tubes, a pair of NMOS (N-channel Metal Oxide Semiconductor) tubes, six current sources and two RC (Resistance-Capacitance) networks; two branches are arranged between the power supply and the ground. A grid electrode of the first PMOS tube is connected with a grid electrode of the first NMOS tube, a grid electrode of the second PMOS tube is connected with a grid electrode of the second NMOS tube, and the first PMOS tube and the second PMOS tube respectively receive a pair of differential input voltages. The drain electrode of the first PMOS tube is connected with the drain electrode of the first NMOS tube, the drain electrode of the second PMOS tube is connected with the drain electrode of the second NMOS tube, and a pair of differential intermediate signals is output respectively. The circuit is simple in structure and only has a primary circuit; a complementary structure of PMOS input geminate transistors and NMOS input geminate transistors is adopted, bias current is utilized to the maximum extent, power consumption is low, and compared with a traditional circuit, the current utilization rate is improved; balancing of a wide frequency band can be realized under the condition of low power consumption, and the gain is high.
Owner:ASR MICROELECTRONICS CO LTD
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
Improved wide-field-of-view lidar
A lidar system based on measuring a time-of-flight, including: an emission device configured to emit light pulses towards a scene at an angle greater than or equal to 5°; a reception device including: o a photodetector configured to receive pulses reflected or backscattered by at least one element of the scene and to convert the pulses into an electrical signal, an amplification circuit configured to amplify the electrical signal, a processing unit for processing the amplified electrical signal, configured to digitize the amplified electrical signal and determine a distance from the at least one element based on the digitized amplified electrical signal, the amplification circuit including a transimpedance amplifier, a transformer including a primary and a secondary, a capacitor and an inductor arranged in series with the capacitor.
Owner:CENT NAT DE LA RECH SCI (C N R S) +1
Optical data signal receiver
PendingUS20250337500A1Gain controlAmplifier with semiconductor-devices/discharge-tubesControl signalSoftware engineering
An assembly of electronic components for reception of data using an optical fiber wherein data is received in bursts, the assembly including: a photodiode; a transimpedance amplifier coupled to said photodiode, wherein a gain of the transimpedance amplifier is adjusted based on a level of a gain control signal; a received input signal sensor configured to sense a received input signal level; and a signal preamble detector configured to detect the end of at least one of said preamble patterns in a data burst conveyed in said received signal and further configured to generate said settling control signal as an output.
Owner:TOP INTEGRATED CIRCUITS LTD
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
Homodyne detection Doppler wind measurement laser radar device based on silicon optical chip
PendingCN119667714AImprove compactnessminiaturizationElectromagnetic wave reradiationICT adaptationDigital signal processingBeam splitter
A homodyne detection Doppler wind measurement laser radar device based on a silicon optical chip comprises a light source module, a photoelectron chip module, a semiconductor optical amplifier, an erbium-doped optical fiber amplifier, an optical circulator, an optical transceiver antenna, a transimpedance amplifier processing module, an A / D acquisition card module, a digital signal processing module and a display and storage module. Discrete devices such as a beam splitter, a frequency mixer and a detector in an optical fiber link are integrated on one chip, high-density integration with other components is carried out through the photoelectric hybrid packaging technology, and chipping and miniaturization of the all-optical-fiber wind finding radar are achieved. The semiconductor optical amplifier (SOA) is used for chopping, a homodyne detection method is used for eliminating the requirement for frequency shift, and compared with a traditional Doppler wind measurement laser radar, the Doppler wind measurement laser radar has the advantages of being small in power consumption, small in size, light in weight, high in integration level, convenient to produce in a large scale, low in cost of a single device and the like.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Multi-mode optical fiber high-speed light receiving assembly
The invention provides a multimode optical fiber high-speed light receiving assembly. The multimode optical fiber high-speed light receiving assembly comprises a tail fiber assembly, a photosensitive diode assembly, a trans-impedance amplifier, a packaging seat and a packaging cap, the transimpedance amplifier is installed on the packaging base and used for converting current output by the photosensitive diode assembly into a voltage signal to be output; the photosensitive diode assembly is installed on the trans-impedance amplifier and used for receiving an external optical signal transmitted by the tail fiber assembly and converting the optical signal into a current signal. The packaging cap covers the photosensitive diode assembly, the mounting surface of the packaging cap and the second end surface of the packaging seat are welded together, and the packaging cap is provided with a through hole for welding and fixing the tail fiber assembly; the tail fiber assembly is welded in the through hole of the packaging cap, is aligned with the photosensitive area of the photosensitive diode assembly, and is used for receiving an external laser signal. The packaging seat and the packaging cap are welded together to provide an airtight space for the transimpedance amplifier and the photosensitive diode assembly.
Owner:BEIJING AEROSPACE TIMES OPTICAL ELECTRONICS TECH
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
Potentiostat-based electrochemical sensor detection device and system including same
PCT designated stageWO2025198166A1Multiple-port networksDifferential amplifiersDigital signal processingLow-pass filter
Provided is a potentiostat-based electrochemical sensor detection device. The device comprises: a digital-to-analog converter (DAC) configured to receive a digital signal from a waveform generator and digital logic and output an analog signal corresponding to a reference voltage; a control amplifier (CA) configured to receive the analog signal corresponding to the reference voltage and apply the reference voltage to a reference electrode (RE); a gain-boosting current mirror configured to copy a sensor current of an electrochemical sensor and output a copied sensor current; a transimpedance amplifier configured to convert the copied sensor current into a voltage signal; a low-pass filter configured to block a high-frequency band signal component of the voltage signal; and an analog-to-digital converter (ADC) configured to perform digital signal processing on a signal having passed through the low-pass filter, wherein at least one of the gain-boosting current mirror and the transimpedance amplifier employs a dynamic element matching (DEM) technique using a plurality of choppers and a plurality of DEM clock signals.
Owner:KOREA ADVANCED INST OF SCI & TECH
Optical receiver
ActiveUS20250141561A1Amplifiers controlled by lightElectromagnetic receiversParasitic capacitorCapacitance
An optical receiver includes a light receiving element, a capacitor, a transimpedance amplifier, and a base. The light receiving element includes a semiconductor layer, a first conductive film electrically connected to a cathode electrode, a second conductive film electrically connected to the first conductive film through a conductor, and an anode pattern electrically connected to an anode electrode. The transimpedance amplifier has a first pad electrically connected to the first conductive film through a first wire and a second pad electrically connected to the anode pattern through a second wire. The base has a main surface. An electrostatic capacitance between the second conductive film and the main surface of the base is larger than a parasitic capacitance between the first conductive film and the second conductive film, and the inductance of the conductor is smaller than the inductance of the first wire.
Owner:SUMITOMO ELECTRIC INDUSTRIES LTD
Systems and devices for digital-domain temperature compensation in logarithmic transimpedance amplifiers
PendingUS20250244167A1Analogue/digital conversionAmplifier with semiconductor-devices/discharge-tubesA d converterComputational physics
Technologies are provided to calculate a logarithm of an input current to a logarithmic transimpedance amplifier device at a particular temperature. The logarithm of the current is calculated in digital domain based on sampling of analog signals that are internal to the logarithmic transimpedance amplifier device. The sampling can be performed, in some cases, by an analog-to-digital converter device integrated into the logarithmic transimpedance amplifier device. The calculation in digital domain is performed by one or more processor external to the logarithmic transimpedance amplifier device. The calculation includes a determination of a temperature compensation factor based on an internal analog signal indicative of temperature of the logarithmic transimpedance amplifier device. The temperature compensation factor permits removing temperature dependence from a logarithmic output voltage originating from the input current. Operating in the digital domain permits applying corrections that account for residual leakage current and an emitter-resistance correction at high input currents.
Owner:ANALOG DEVICES INC
Ocean laser radar and method for preventing water surface signal saturation
The invention discloses an ocean laser radar and method for preventing water surface signal saturation, and belongs to the technical field of laser radars. The ocean laser radar comprises a laser emission system, an optical system, a signal processing system and a data acquisition and processing system. The laser emission system emits laser and generates a trigger pulse; the optical system splits the backward scattered light into first split light and second split light through a beam splitter prism; in the signal processing system, a first processing branch converts first split light into a first electric signal through a first photoelectric detector, a high-speed switch and a first transimpedance amplifier, and a second processing branch converts second split light into a second electric signal through a second photoelectric detector and a second transimpedance amplifier; and the data acquisition and processing system controls laser emission, high-speed switching and electric signal acquisition and processing. According to the ocean laser radar and method for preventing water surface signal saturation, a high-speed switch can be controlled, water surface high-reflection signals are prevented from entering a trans-impedance amplifier, and underwater signals are prevented from being affected.
Owner:崂山国家实验室
Extinction ratio measuring system and extinction ratio measuring method
The invention discloses an extinction ratio measurement system and an extinction ratio measurement method, and relates to the technical field of optical module extinction ratio measurement. The transimpedance amplification circuit is connected with the optical module to be measured and used for monitoring the optical signal intensity of the optical module to be measured and obtaining a power monitoring voltage signal; decomposing the optical signal of the optical module to be tested to obtain a reference voltage signal and a test voltage signal; the linear output circuit is connected with the transimpedance amplification circuit and used for carrying out linear amplification on a difference value between the reference voltage signal and the test voltage signal to obtain a modulation amplitude voltage signal; and the processing circuit is respectively connected with the transimpedance amplification circuit and the linear output circuit, and is used for determining the light modulation amplitude according to the ratio of the power monitoring voltage signal to the modulation amplitude voltage signal, and determining the extinction ratio of the optical module to be detected according to the light modulation amplitude and the light power corresponding to the power monitoring voltage signal. The measurement cost of the extinction ratio of the optical module can be reduced.
Owner:SICHUAN TRIXON COMM TECH CORP LTD
Techniques for digital-domain temperature compensation in logarithmic transimpedance amplifier devices
PendingUS20250247055A1Amplifier modifications to reduce non-linear distortionThermometers using electric/magnetic elementsA d converterComputational physics
Technologies are provided to calculate a logarithm of an input current to a logarithmic transimpedance amplifier device at a particular temperature. The logarithm of the current is calculated in digital domain based on sampling of analog signals that are internal to the logarithmic transimpedance amplifier device. The sampling can be performed, in some cases, by an analog-to-digital converter device integrated into the logarithmic transimpedance amplifier device. The calculation in digital domain is performed by one or more processor external to the logarithmic transimpedance amplifier device. The calculation includes a determination of a temperature compensation factor based on an internal analog signal indicative of temperature of the logarithmic transimpedance amplifier device. The temperature compensation factor permits removing temperature dependence from a logarithmic output voltage originating from the input current. Operating in the digital domain permits applying corrections that account for residual leakage current and an emitter-resistance correction at high input currents.
Owner:ANALOG DEVICES INC
Miniaturized photoelectric detector
The invention relates to the technical field of photoelectric detection, and particularly discloses a miniaturized photoelectric detector, which comprises a tube shell, one end of the tube shell is provided with a cover plate, and the other end of the tube shell is provided with a radio frequency connector and a pin in a penetrating manner; the photoelectric conversion assembly comprises a first substrate, a second substrate, a photodiode and a transimpedance amplifier which are arranged in the tube shell, the radio frequency connector and the transimpedance amplifier are both electrically connected with the first substrate, the photodiode and the pins are both electrically connected with the second substrate, and the second substrate and the photodiode are both electrically connected with the transimpedance amplifier; the shielding cover is arranged in the tube shell and is arranged outside the radio frequency connector in a surrounding manner; wherein an optical fiber assembly and a lens assembly are arranged on the outer side and the inner side of the cover plate respectively, a through hole is formed in the cover plate, and the optical fiber assembly, the through hole, the lens assembly and the photodiode are located on the same straight line. The system is compact in structure, beneficial to system integration, high in anti-interference capability, high in stability and high in reliability.
Owner:CHENGDU XIJIAO JIERUI OPTOELECTRONICS TECH CO LTD
High-speed multi-channel light receiving assembly
The invention relates to a high-speed multi-channel optical receiving assembly, which relates to the technical field of optical transmission and comprises an optical fiber array, a waveguide type photoelectric detector, a trans-impedance amplifier and a connecting substrate, the optical fiber array serves as an optical input port and is used for receiving the multi-channel optical signals and transmitting the multi-channel optical signals to the waveguide type photoelectric detector; the waveguide type photoelectric detector is fixed on the surface of the connecting substrate and is used for converting an optical signal input by the optical fiber array into an electric signal; the light output end of the optical fiber array is directly coupled with the light input waveguide; the transimpedance amplifier is fixed on the surface of the connecting substrate, is connected with an electric signal output end of the waveguide type photoelectric detector through a transmission line, and is used for converting a current signal output by the photoelectric detector into a voltage signal; and the connecting substrate is used for realizing electric interconnection between the waveguide type photoelectric detector and the trans-impedance amplifier. According to the invention, channel expansion of the optical receiving assembly is facilitated, high-efficiency coupling of optical paths is realized, and large bandwidth and high responsivity are realized at the same time.
Owner:雄安创新研究院
LDO circuit based on current feedback
PendingCN119396242AReduce layout arealow costElectric variable regulationHemt circuitsTransimpedance amplifier
The invention discloses an LDO (Low Dropout Regulator) circuit based on current feedback, which comprises a transconductance amplifier for amplifying reference voltage into current and inputting the current into a positive phase input end of an error transresistance amplifier; the error transimpedance amplifier, the buffer, the second PMOS transistor, the first PMOS transistor and the current-current feedback network form an error current feedback loop, the negative phase input end of the error transimpedance amplifier receives feedback current from the current-current feedback network, and the output end of the error transimpedance amplifier outputs error voltage; the buffer receives the error voltage output by the error trans-impedance amplifier, generates a buffer stage output voltage and drives the second PMOS tube to generate an output voltage; the first PMOS transistor is used for detecting fluctuation of output voltage, if the output voltage fluctuates, current flowing through the first PMOS transistor changes, the current-current feedback network generates feedback current according to the current change of the first PMOS transistor, the feedback current is input to the negative phase input end of the error trans-impedance amplifier, and fluctuation of the output voltage is counteracted.
Owner:上海帝迪集成电路设计有限公司
Continuous time linear equalization (CTLE) feedback for tunable DC gain and mid-band correction
ActiveUS12381527B2Differential amplifiersAmplification control detailsSoftware engineeringHemt circuits
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.
Owner:SAMSUNG DISPLAY CO LTD
Area-efficient power detection subsystem for phased array transmitter
In some aspects, an apparatus may comprise multiple power coupling circuits that are each coupled between a respective power amplifier and a respective antenna element in a phased array, each power coupling circuit configured to generate a current proportional to an output power of the respective power amplifier. The apparatus may comprise a shared transimpedance amplifier (TIA) coupled to the multiple power coupling circuits, wherein the shared TIA comprises an input to receive, from the multiple power coupling circuits, the respective generated currents and an output to provide an analog signal indicating a value of the respective generated currents received from the multiple power coupling circuits. The apparatus may comprise an analog-to-digital converter (ADC) that comprises an input coupled to the output from the shared TIA and an output configured to provide a digital signal indicating the output powers from the power amplifiers. Numerous other aspects are described.
Owner:QUALCOMM INC
A quantum random number generator chip and design method
The present invention discloses a quantum random number generator chip and design method. The chip includes: an optical chip, a transimpedance amplifier chip, and a microcontroller chip connected in sequence, wherein: the optical chip includes a continuous laser, an optical beam splitter, a first optical attenuator, a second optical attenuator, a first photodetector, and a second photodetector; the microcontroller chip includes a first digital-to-analog converter, a second digital-to-analog converter, an analog-to-digital converter, and a processor; the transimpedance amplifier chip includes a transimpedance amplifier; wherein the optical chip, the transimpedance amplifier chip, and the microcontroller chip are packaged to obtain a quantum random number generator chip. The present invention packages the optical chip and the microcontroller chip into a single chip through a systematic packaging method, significantly reducing the size of the quantum random number system, greatly improving the stability of the system and structure, while reducing power consumption and cost, and expanding the scope and application scenarios.
Owner:UNIV OF SCI & TECH OF CHINA