140 results about "Trans impedance amplifier" patented technology

The broadband weak current signal detection system comprises a signal acquisition mother board and an upper computer system, the signal acquisition mother board is provided with a signal input interface, a channel switching circuit, a transimpedance amplification circuit, an analog-to-digital conversion circuit, a control core board and the upper computer system, and a three-coaxial BNC interface is adopted. Electromagnetic noise interference in the environment is shielded by a metal noise shielding structure; detecting the switching of a wide measuring range and the switching of an alternating current and direct current coupling mode; weak current signals are converted into measurable voltage signals through a trans-impedance amplifier, and the voltage signals obtained after conditioning are converted into digital quantized values through an analog-to-digital converter (ADC); after being processed by a digital noise reduction algorithm, the data are stored; therefore, the real-time measurement of the broadband weak current signal is realized. The broadband weak current signal detection system has the characteristics of high resolution, good repeatability, high measurement accuracy and good real-time performance, and has good detection capability on weak current signals.

A calibration circuit includes a replica transconductance stage that is a replica of a transconductance amplifier in a serializer / deserializer (SerDes) interface and a replica transimpedance stage that is a replica of a transimpedance amplifier in the SerDes interface. The replica transimpedance stage has an input coupled to its output. A comparison circuit is configured to generate a difference signal representative of a difference between voltage levels of an input signal received at an input of the replica transconductance stage and an output signal representative of voltage level at the output of the replica transimpedance stage. Replica feedback resistors are configured to couple an output of the replica transimpedance stage to the input of the replica transconductance stage. The difference signal can be used to select resistance values provided by the replica feedback resistors and by corresponding gain control resistors in the transimpedance amplifier in the SerDes interface.

The invention provides a gain calibration method for a receiving link of a vehicle gauge level chip and related equipment, and the method comprises the steps: enabling a chirp signal for gain calibration to pass through a trans-impedance amplifier, a first gain amplifier and a second gain amplifier in sequence for adjustment processing, and enabling the chirp signal to pass through an analog-to-digital converter when the chirp signal reaches the analog-to-digital converter; obtaining a digital signal corresponding to the adjusted chirp signal output by the analog-to-digital converter through an algorithm adjusting circuit; obtaining a signal energy value corresponding to the digital signal based on a preset digital algorithm through an algorithm adjusting circuit; the signal compensation value corresponding to the signal energy value is obtained through the algorithm adjusting circuit based on the preset gain compensation table, and the signal compensation value is sent to the trans-impedance amplifier, the first gain amplifier or the second gain amplifier corresponding to the chirp signal to perform gain compensation, so that the problems of poor timeliness, low precision and high efficiency of traditional receiving gain adjustment can be effectively solved. And due to the limitation of poor channel consistency of different channels, the reliability and the precision of gain calibration of the vehicle gauge level chip receiving link are improved.

The invention provides a zero-seeking phase-switchable photoelectric encoder chip design. The zero-seeking phase-switchable photoelectric encoder chip design is characterized in that the zero-seeking phase-switchable photoelectric encoder chip design is mainly composed of an incremental code channel photodiode PD array (1), a zero signal detection photodiode PD array (2), a trans-impedance amplifier TIA array (3), a switch unit array (4), a control switching circuit (5) and a photoelectric encoder chip (6). According to the invention, the problem of precision loss caused by the phase error of the increment signal and the zero signal in the practical application process of the photoelectric encoder chip can be effectively solved, the fault tolerance and reliability of the photoelectric encoder system can be effectively improved, and the photoelectric encoder chip can be widely applied to the fields of industrial automation, medical equipment, aerospace and the like.

The invention relates to the technical field of current intelligent decision making, in particular to an acupoint stimulation current decision making method and system based on an integrated fingerstall electrode, and the method comprises the steps: receiving a starting instruction of the integrated fingerstall electrode, enabling a fingerstall in the integrated fingerstall electrode to start collecting a current signal of an acupoint in real time to obtain an initial acupoint current signal, and carrying out the conversion through a trans-impedance amplifier, initial acupoint voltage signals are obtained, the initial acupoint voltage signals are preprocessed, and a target acupoint multi-domain composite feature set is obtained; performing model construction on the acupoint stimulation data set by using a deep learning algorithm to obtain an acupoint stimulation current decision model, and obtaining optimal stimulation current intensity, stimulation current frequency and stimulation current waveform parameters based on a target acupoint multi-domain composite feature set and a pre-constructed evaluation method, a plurality of micro electrodes in the fingerstall are set to obtain a current output fingerstall, and the current output fingerstall and a safety monitoring method are utilized to stimulate the target acupuncture point. According to the invention, intelligent decision of acupoint stimulation current can be realized.

The invention relates to the technical field of silicon optical communication, and discloses a silicon optical module. According to the silicon optical module, a signal transceiver is a bare chip and is arranged on a circuit board, a trans-impedance amplifier is integrated on the signal transceiver and is used for amplifying an electric signal, a digital signal processor is also integrated on the signal transceiver and is electrically connected with the trans-impedance amplifier, and the digital signal processor is used for receiving and processing the electric signal amplified by the trans-impedance amplifier. The extra packaging size of the bare chip signal transceiver is reduced, the trans-impedance amplifier and the digital signal processor are integrated on the signal transceiver, and the occupied area of the components on a circuit board is further reduced. The compact design enables the circuit board to have more space for arranging other elements, the integration level and the space utilization rate of the circuit board are improved, and the manufacturing cost of the silicon optical module is reduced.

The invention provides an alternating-current weak current high-precision detection system and method, and the system comprises a copper-nickel alloy shielding cover which is used for inhibiting space power frequency radiation interference and power system broadband noise, and a magnetic sensitive element which is used for converting the detected magnetic field change into a corresponding initial current signal, the trans-impedance amplifier is used for converting the initial current signal into a voltage signal; the adaptive noise suppression module collects a power frequency fundamental wave reference signal and a harmonic wave reference signal, generates a harmonic wave anti-phase counteracting signal, and performs anti-phase counteracting on real noise of the initial current signal; the analog-to-digital converter is used for converting the voltage signal into a discretized digital signal, and the discretized digital signal comprises a target signal and a random noise signal; and the FPGA coherent demodulation module is used for carrying out cross-correlation operation and narrow-band filtering on the target signal and the random noise signal to separate out a micro-current signal. The technical problems that in the prior art, composite noise covering is limited, the frequency fluctuation adaptability is poor, and microvolt-level signals are difficult to capture are solved.

The utility model provides an optical module. The optical module includes: a circuit board; the optical detector is used for converting an optical signal into an electric signal; the transimpedance amplifier is provided with a chip mounting area for flip-chip bonding of the optical detector and a first signal bonding pad electrically connected with the circuit board; the optical detector is arranged in the chip installation area, the chip installation area comprises a second signal bonding pad electrically connected with the first signal bonding pad, and the second signal bonding pad is electrically connected with a signal electrode of the optical detector. And the second signal bonding pad is positioned on one side, which is adjacent to the first signal bonding pad, of the chip mounting area. The high-speed link of the optical module provided by the utility model has small inductance and impedance, thereby facilitating the improvement of bandwidth and link rate.

The invention discloses a balance detection device based on digital post-processing, and the device comprises a first photoelectric conversion channel which is sequentially connected with a first photodiode, a first blocking capacitor, a first trans-impedance amplifier, and a first analog-to-digital converter; the second photoelectric conversion channel is connected with a second photodiode, a second blocking capacitor, a second transimpedance amplifier and a second analog-to-digital converter in sequence; the digital logic processing module receives digital waveform signals of the two analog-to-digital converters; according to the invention, common-mode noise can be suppressed more effectively.

To provide a system and a method for accurately detecting recovery from the loss of a signal in an optical receiver.SOLUTION: An optical device, which is part of an optical receiver 310, comprises: a photodiode 311 configured to receive optical signals; and a linear trans-impedance amplifier (TIA) 312 having an input stage 313, an output stage 315, and at least one variable gain amplifier (VGA) 314 provided between the input stage and the output stage. The optical device also comprises: an automatic gain control loop 331 configured to rectify an output of the at least one VGA and compare the rectified output with a threshold gain setting to generate an automatic gain control voltage; and a detection circuitry 330 being configured to detect a rate of change in the automatic gain control voltage and being configured to determine a first state indicative of an absence of the optical signals at the photodiode. At least in response to the determined first state, the detection circuitry is configured to disable the output stage of the linear TIA.SELECTED DRAWING: Figure 3

The invention provides a current measuring circuit and method for a photoelectric conversion device, and the circuit comprises a trans-impedance amplifier which is used for amplifying a current signal of the device and converting the current signal into a voltage signal; the high-pass filtering circuit is used for performing high-pass filtering on the voltage signal; the filter matrix comprises an all-pass filter and a low-pass filter; the first programmed switch is used for selectively outputting an output signal of one of the filter matrixes; the voltage follower is used for following an output signal of the first programmed switch; the subtractor with adjustable gain is used for acquiring the difference between the output signals of the voltage follower and the high-pass filter; the second programmed switch is used for selectively outputting an output signal of one of the high-pass filter, the subtracter and the voltage follower; the ADC module is used for collecting an output signal of the second programmed switch; and the main controller is used for controlling the programmed switch and acquiring a target current measurement value according to an output signal of the ADC module. According to the invention, functions of gain adjustability, bandwidth adjustability and calibration correction can be considered.

The invention discloses a transimpedance amplifier and an optical receiver, and relates to the technical field of transimpedance amplifiers, the transimpedance amplifier comprises a transimpedance circuit and a post-stage circuit; an input end balancing unit is arranged between the transimpedance circuit and the photoelectric detector; the post-stage circuit is connected with the transimpedance circuit, and a post-stage equalization unit is arranged in the post-stage circuit; the design bandwidth of the post-stage circuit is higher than the target bandwidth of the transimpedance amplifier. According to the invention, the bandwidth of the post-stage circuit is designed to be higher than the target bandwidth of the transimpedance amplifier, and the bandwidth of the transimpedance circuit can be designed to be lower than the target bandwidth required by signal transmission under the condition that the overall bandwidth accords with the target bandwidth of signal transmission, so that lower noise can be obtained. And the bandwidth is improved by combining the two-time equalization expansion of the input end equalization unit and the post-stage equalization unit of the post-stage circuit, so that the characteristics of wide bandwidth and low noise of the whole circuit of the trans-impedance amplifier are realized at the same time on the whole.

The invention relates to the technical field of circuit design, in particular to a cascade cross array, a data processing method and electronic equipment, the array comprises at least one first row line, at least one second row line and at least one column line, and memristive devices are arranged at cross nodes of the first row line and the second row line and the column line; the voltage input module comprises at least one output end, the output end is connected with the first row line, and the output end applies input voltage to the first row line; a trans-impedance amplifier and an analog-to-digital converter are arranged on the second row line, the trans-impedance amplifier is used for clamping the voltage of the second row line to 0V and converting the current of the second row line into voltage, and the analog-to-digital converter outputs the voltage of the trans-impedance amplifier. Therefore, the problems of high power consumption, high delay, incapability of introducing nonlinear transformation in calculation and the like when a voltage input module, an analog-to-digital converter and a trans-impedance amplifier are used for many times are solved.

A zero intermediate frequency receiver and wireless communication equipment, the zero intermediate frequency receiver comprises a direct current offset correction circuit and a data receiving link, the data receiving link comprises a trans-impedance amplifier, a low pass filter, a programmable gain amplification circuit and an analog-to-digital converter which are connected in series, the DC offset correction circuit comprises a control module, a first correction module, a second correction module and a third correction module. And the control module is suitable for determining a first target calibration value, a second target calibration value and a third target calibration value based on the DC offset on the data receiving link, outputting the first target calibration value to the first correction module, outputting the second target calibration value to the second correction module, and outputting the third target calibration value to the third correction module. According to the scheme, high-precision correction of the zero intermediate frequency receiver can be realized.

A device may include one or more of a transmit path, a receive path, or an optical interface receiver. The transmit path may include an electrical-optical interface that may receive an electrical signal and send an optical signal. The receive path may include a trans-impedance amplifier (TIA) that may send a bypass signal. The optical interface receiver may be coupled to the receive path. The optical interface receiver may sense the bypass signal.

The invention discloses a common-mode gain suppression active balun architecture, a receiver and a communication system. The common-mode gain suppression active balun architecture comprises a first amplifier unit, a second amplifier unit and a trans-impedance amplifier unit. The first amplifier unit is connected with a first input voltage and a second bias voltage and outputs a first current path and a second current path; the second amplifier unit is connected with a second input voltage and a second bias voltage and outputs a first current path and a second current path; the transimpedance amplifier unit amplifies the first current path and the second current path and then outputs a first differential signal and a second differential signal. The first current path and the second current path generated by the two amplifier units are added to the input node of the trans-impedance amplifier unit in a crossed mode, when differential signals are subtracted, common-mode components can be restrained, and therefore the gain and phase mismatch of output signals can be reduced.

The present disclosure presents glucose sensing methods and systems. One such system comprises an electrospun-nanofibrous-membrane (ENFM)-based amperometric glucose sensor integrated on a silicon chip, in which the glucose sensor has a working electrode, a reference electrode, and a counter electrode, wherein the working electrode comprises an ENFM-based sensing electrode. The system further comprises a potentiostat circuit integrated on the silicon chip such that the potentiostat circuit comprises a voltage control unit to control a voltage difference between the working electrode and the reference electrode and a transimpedance amplifier to measure a current flow between the working electrode and the counter electrode, in which a strength of the current flow corresponds to an amount of glucose present in a sample of blood on the glucose sensor.

This invention relates to the field of high-resolution time measurement systems and integrated circuit technology, providing a time measurement circuit with a two-dimensional address-modulated TOT pulse, comprising: a common-gate transimpedance amplifier, a high-speed high-gain comparator, a current-mode logic output stage, a common-mode feedback threshold setting circuit, and a two-dimensional address-modulated TOT pulse circuit; the address modulation pulse circuit includes an address modulation pulse width circuit and an address modulation pulse amplitude circuit, wherein the address modulation pulse width circuit includes: multiple sets of first modulation units, multiple sets of second modulation units, multiple inverters, and multiple bits of first digital code; the address modulation pulse amplitude circuit includes: multiple sets of third modulation units and multiple bits of second digital code. This invention allows a single TOT signal to simultaneously carry time information, energy information, and address information, reducing wiring, improving reliability, and increasing integration density.

The invention particularly relates to a trans-impedance amplifier circuit with variable gain. The trans-impedance amplifier circuit comprises a photoelectric conversion element, an operational amplifier, a trans-impedance component and a bypass component, by means of the design of the bypass assembly, the overall resistance value of the transimpedance assembly is adjusted, so that the adjustable range of the resistance value of the transimpedance assembly is enlarged, the wide variable gain of transimpedance is achieved, and the optical power detection device is suitable for large-range optical power detection. Meanwhile, by means of the design of the bypass assembly, the series resistors of the transimpedance assembly are bypassed, so that the resistance value of the minimum resistor in the resistance adjusting range of the transimpedance assembly reaches the sum of the resistance values of all the resistors, and the optical power detection can be infinitely small or infinitely large theoretically. Moreover, due to the bypass design of the bypass assembly, the variable gain adjustment of the transimpedance assembly is more flexible and reliable.

The invention discloses an APD focal plane pixel circuit with a ToF calibration function, and relates to the technical field of photoelectricity and microelectronics. The circuit is composed of a T-type transimpedance amplifier circuit 1, a time discrimination circuit 2, a flight time calibration circuit 3, a pulse width voltage conversion circuit 4 and an output voltage buffer 5. The invention provides a small-area, low-power-consumption and high-precision ToF detection scheme, the structure is simple, the method is particularly suitable for a focal plane detector, and the requirements of limited pixel area and power consumption can be met; by reasonably designing a feedback network of the T-type trans-impedance amplifier, the T-type trans-impedance amplifier has the advantages of high gain and small area, and is adaptive to a focal plane detector with limited pixel area; according to the ToF calibration scheme combining the Schmitt trigger and the pulse width voltage conversion circuit, the walking error can be calibrated at the cost of small area and power consumption, and the ToF detection precision can be effectively improved without complex means.

The invention discloses an optical engine based on a CPO technology, and relates to the technical field of optical communication, and the key points of the technical scheme are that the optical engine comprises a transmitting end module, a receiving end module, a PCB, an optical fiber connecting line assembly and a housing assembly; wherein the receiving end module comprises multiple groups of receiving end assemblies, the multiple groups of receiving end assemblies are arranged on the front surface of the PCB side by side in an array manner, and each group of receiving end assembly comprises a trans-impedance amplifier TIA chip, a receiving end PIC chip and a receiving end FA optical fiber array; the transmitting terminal module comprises a plurality of groups of transmitting terminal assemblies, and each group of transmitting terminal assembly comprises a driver chip, a transmitting terminal PIC chip, a first transmitting terminal FA optical fiber array and a second transmitting terminal FA optical fiber array; the Driver chip is electrically connected with the transmitting end PIC chip, and the transmitting end PIC chip is in optical coupling connection with the transmitting end FA optical fiber array; and the light engine is electrically connected with external electronic equipment through a Socket PAD on the back surface of the PCB. The device has the characteristics of small size, low performance loss, low power consumption and high reliability.

The application discloses a common-mode gain suppression active balun architecture, a receiver and a communication system, and the common-mode gain suppression active balun architecture comprises a first amplifier unit, a second amplifier unit and a transimpedance amplifier unit. The first amplifier unit is connected with a first input voltage and a second bias voltage, and outputs a first current path and a second current path; the second amplifier unit is connected with a second input voltage and the second bias voltage, and outputs the first current path and the second current path; and the transimpedance amplifier unit amplifies the first current path and the second current path and then outputs a first differential signal and a second differential signal. In the application, the first current path and the second current path generated by the two amplifier units are cross-added at an input node of the transimpedance amplifier unit, and when the differential signals are subtracted, the common-mode component can be suppressed, so that the gain and phase mismatch of the output signal can be reduced.

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. The current frequency deviation is subtracted from the optical power calculation value on the basis of the reference optical power value, so that the calculated optical power is closer to the actual optical power, and the accuracy of the reported optical power is improved.

The invention relates to a device and a method for detecting a current of a first electrical conductor, in particular of an electrical circuit mounted at least partially on a printed circuit board. The invention relates to a device and a method for detecting a current directly or indirectly by means of a change in current of a first electrical conductor of an electrical circuit, in particular at least partially mounted on a printed circuit board, wherein a short-circuit current proportional to a change in the current in the first conductor is generated in combination with a connected transimpedance amplifier in combination with a change in the magnetic flux given in the first conductor by a change in the current, said sensor sensitive element being embodied according to the invention and placed around the first conductor.

The embodiment of the invention provides a low-noise broadband SerDes receiver analog front end, method and equipment, and belongs to the field of integrated circuit design. The broadband SerDes receiver analog front end comprises an input terminal, a continuous time linear equalizer, a variable gain amplifier and a trans-impedance amplifier which are connected in sequence. The continuous time linear equalizer and / or the variable gain amplifier comprise / comprises at least one reverse coupling peaking inductance structure; the transimpedance amplifier comprises a low-impedance path noise shunting structure; the reverse coupling peaking inductance structure of the variable gain amplifier is mutually coupled with an inductor in the low-impedance path noise shunting structure of the trans-impedance amplifier to form a three-coupling inter-stage feedback structure. According to the invention, the problems of high noise, limited bandwidth and difficult consideration of gain and power consumption in the prior art are effectively solved, and the high-performance and low-power-consumption receiver analog front end supporting 100Gbps PAM4 signal transmission is realized.

The application discloses a wireless communication receiver and a wireless communication receiving method. The receiver comprises a signal receiving circuit and a data processing circuit. The signal receiving circuit is used for receiving a wireless data packet transmitted by a remote device, wherein the wireless data packet comprises a preamble signal and a data signal. The signal receiving circuit comprises a transimpedance amplifier, a low-pass filter and an analog-to-digital converter connected in sequence. The transimpedance amplifier and the low-pass filter are configured in a wideband mode and a filtering mode. An input end of the data processing circuit is connected with an output end of the signal receiving circuit. The data processing circuit is further connected with the transimpedance amplifier and the low-pass filter. The data processing circuit is used for sending a control signal to switch the modes of the transimpedance amplifier and the low-pass filter. Compared with a conventional receiver, the application saves area and power and has more accurate signal strength estimation.

The invention belongs to the field of integrated circuits, and particularly relates to a JFET (Junction Field Effect Transistor) input operational amplifier suitable for high-speed weak current detection, which comprises a first biasing circuit, a second biasing circuit, a third biasing circuit, a fourth biasing circuit, a fifth biasing circuit and a sixth biasing circuit, the product of the gain of the differential input stage circuit and the gain of the intermediate amplification stage circuit is used as the gain of the amplifier, the complementary push-pull output stage circuit and the intermediate amplification stage circuit adopt a folded common-emitter common-base structure with emitter feedback, and the intermediate amplification stage circuit converts two differential signals output by the differential input stage circuit into single-ended signals. The complementary push-pull output stage circuit further converts the single-ended signal into an output signal of the amplifier. The problems of a trans-impedance amplifier with high gain bandwidth product, high slew rate, low noise and low input bias current required during high-speed weak current detection in the prior art are solved.

The invention discloses a photonic system and method for simultaneously measuring a microwave angle of arrival and Doppler frequency shift, and belongs to the technical field of microwave photon-assisted radars, the photonic system drives one sub-MZM through an echo signal, and simultaneously drives the other sub-MZM through a combination of a phase delay echo signal and a transmission signal. Two on-chip optical band-pass filters are adopted to select an upper sideband and a lower sideband of an output signal of the high-speed silicon-based dual-parallel Mach-Zehnder modulator, and then two intermediate-frequency signals are generated after detection by an on-chip photoelectric detector and amplified by a trans-impedance amplifier. By comparing the power, phase and frequency of the intermediate frequency signals, the microwave arrival angle and Doppler frequency shift (including direction information) can be obtained at the same time. The device is small in measurement error, is highly integrated, has the advantages of compact size and high system stability, and has a good application prospect in a radar system.

The application relates to a trans-impedance amplifier integrated with automatic reset and fast burst response, which comprises a trans-impedance amplifier front-end circuit, a reset signal automatic generation circuit in communication with the trans-impedance amplifier front-end circuit and an adjustable low-pass filter circuit; the adjustable low-pass filter circuit is in communication with an output signal of the trans-impedance amplifier front-end circuit and in communication with reset signals RST and inverse reset signals RSTB generated by the reset signal automatic generation circuit; the adjustable low-pass filter circuit is used for controlling MOS variable resistors and MOS switches arranged in the adjustable low-pass filter circuit according to the reset signals RST and the inverse reset signals RSTB and forming a low-pass filter with adjustable cut-off frequency, and a signal output by the low-pass filter with adjustable cut-off frequency conforms to a mean interval of a voltage signal output by the trans-impedance amplifier front-end circuit. An external RESET signal provided by an MCU is no longer needed to complete fast burst response of chips such as a trans-impedance amplifier, a limiting amplifier and a CDR.

The embodiment of the utility model discloses a micro-motion signal detector and a coherent optical module. The micro-motion signal detector comprises at least two parallel detection modules, an isolation module and an amplification module. And each detection module comprises an optical detector and a trans-impedance amplifier which are connected in sequence. The isolation module isolates a direct current signal in the micro voltage signal transmitted by the detection module, and outputs a micro voltage signal only containing an alternating current signal. And the amplification module is connected with the output end of the isolation module and is used for receiving the micro voltage signal subjected to the isolation processing and carrying out multi-stage amplification on the micro voltage signal subjected to the isolation processing. Only one multi-stage amplification link is arranged, so that the amplitude of a micro-motion voltage signal output by each detection module is effectively enhanced, and the response sensitivity of the system to a micro-motion optical signal is improved; and the board distribution area of the high-gain micro-motion signal detector is reduced.