94 results about "Trans impedance amplifier" patented technology

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 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 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 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 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 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 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.

This invention discloses a transimpedance amplifier circuit for 50GPON. The main links of the transimpedance amplifier include a core amplifier, a burst switched-capacitor coupling module, a single-ended to differential variable gain amplifier, an output driver, a first automatic gain control module, a second automatic gain control module, a differential offset cancellation module, a differential amplifier, and a DC voltage operating point module. A current signal is input from the IN terminal, converted into a single-ended voltage signal by the core amplifier, and transmitted to the burst switched-capacitor coupling module. After processing, one end outputs a signal with a DC voltage boost, and the other end outputs the average signal voltage, which serves as the input common-mode level for the single-ended to differential variable gain amplifier. The single-ended to differential variable gain amplifier converts the single-ended signal voltage into a differential voltage. The output driver transmits this differential signal to the next stage chip, ensuring impedance matching during transmission.

The invention discloses a transimpedance amplifier circuit, an optical receiver and a communication circuit system. The transimpedance amplifier circuit comprises a common emitter amplifier, an emitter follower, a feedforward common emitter amplifier and a feedback resistor unit. The common-emitter amplifier is used for accessing a photocurrent signal input by the photoelectric detector and is connected with the emitter follower, and the common-emitter amplifier is also used for improving the bandwidth; the feedback resistor unit is connected between the input end of the common-emitter amplifier and the output end of the emitter follower; and the feed-forward common-emitter amplifier is connected with the emitter follower, and is used for multiplexing the current of the emitter follower to eliminate the conjugate complex pole and adapt to the current input change in the dynamic range. According to the invention, the feed-forward common-emitter amplifier multiplexing the current of the emitter follower is adopted, so that the influence of conjugate complex poles can be suppressed, the frequency response bulge is eliminated, the flatter frequency response is realized, and the dynamic bias emitter follower can be realized, thereby realizing the linearity under large-swing input and obtaining high-quality eye pattern signals.

The invention relates to a chip circuit technology, and discloses a multi-channel CdZnTe readout circuit chip and an implementation method thereof, and the multi-channel CdZnTe readout circuit chip comprises a data processing module, an output interface module and a plurality of front-end readout channels. Each front-end reading channel corresponds to one CdZnTe detector pixel, and each front-end reading channel is provided with a trans-impedance amplifier, a charge sensitive amplifier, a shaping filter, a gain adjustment module and a baseline recovery circuit in sequence from input to output; and the data processing module performs analog-to-digital conversion and analysis processing on the analog signals output by the front-end reading channels, and outputs analysis data obtained by processing through the output interface module. The multi-channel CdZnTe readout circuit chip is low in noise and large in dynamic range, can be suitable for radiation sources with the intensity changing in a large range, and has the high anti-noise capacity.

Systems and methods of monitoring electrodermal activity (EDA) in human subjects suitable for use in wearable electronic devices. An EDA monitoring system can include first and second dry electrodes, an alternating current (AC) excitation signal source, a trans-impedance amplifier, an analog-to-digital (A-to-D) converter, a discrete Fourier transform (DFT) processor, and a microprocessor. The AC excitation signal source can produce an AC excitation signal having a predetermined excitation frequency, such as about 100 or 120 Hertz (Hz). The analog-to-digital (A-to-D) converter can include a sample-and-hold circuit that operates at a predetermined sampling frequency, such as about four times (4×) the predetermined excitation frequency of 100 or 120 Hz. The DFT processor can generate complex frequency domain representations of digitized, sampled voltage level sequences provided by the A-to-D converter for use in obtaining measures of a user's skin impedance or skin conductance.

An integrated circuit includes a silicon photonics substrate and includes a transimpedance amplifier (TIA) chip and a driver chip arranged on the silicon photonics substrate. The silicon photonics substrate includes a silicon-based material, includes electrical connections, and includes silicon photonics components configured to receive and transmit optical signals. The TIA chip includes a silicon-germanium material that is different from the silicon-based material, is connected via the electrical connections to at least one of the silicon photonics components configured to receive an optical signal, and is configured to process a received optical signal and to output a processed signal to a digital signal processor. The driver chip includes CMOS material that is different from the silicon-germanium material and the silicon-based material, and is connected via the electrical connections to drive at least one of the silicon photonics components configured to generate an optical signal for transmission.

The application discloses an electrochemical sensor control circuit and system. The control circuit comprises: a bias driving module electrically connected with a counter electrode and a reference electrode of an electrochemical sensor, used for outputting a driving signal to the counter electrode to maintain a constant potential difference between the reference electrode and a working electrode of the electrochemical sensor; a transimpedance amplifier module with an input end connected to the working electrode of the electrochemical sensor, used for converting a current signal generated by the working electrode into a voltage signal; a dynamic feedback module connected between the output end and the input end of the transimpedance amplifier module, used for switching the feedback impedance of the transimpedance amplifier module, so that the bias control circuit alternately works in a bias maintaining mode and a data acquisition mode; and an analog-to-digital converter with an input end connected to the output end of the transimpedance amplifier module, used for acquiring the voltage signal output by the transimpedance amplifier module in the data acquisition mode. The application can greatly improve the tolerance of the sensor to abnormal leakage.

The present invention relates to the field of intelligent current decision-making technology, specifically a method and system for acupoint stimulation current decision-making based on an integrated finger cuff electrode. The method comprises: receiving a start command from the integrated finger cuff electrode, causing the cuff in the integrated finger cuff electrode to begin real-time acquisition of acupoint current signals to obtain an initial acupoint current signal, converting the signal using a transimpedance amplifier to obtain an initial acupoint voltage signal, and preprocessing the initial acupoint voltage signal to obtain a multi-domain composite feature set of the target acupoint; constructing a model of the acupoint stimulation data set using a deep learning algorithm to obtain an acupoint stimulation current decision model; obtaining optimal stimulation current intensity, stimulation current frequency, and stimulation current waveform parameters based on the multi-domain composite feature set of the target acupoint and a pre-constructed evaluation method; setting multiple microelectrodes in the cuff to obtain a current output cuff; and stimulating the target acupoint using the current output cuff and a safety monitoring method. The present invention can achieve intelligent decision-making on acupoint stimulation current.

A programmable gain amplifier that comprises: a transconductance amplifier, a switch leakage compensation circuit and a transimpedance amplifier. The transconductance amplifier provides a transconductance amplifier current signal and includes a switchable resistance network. The switch leakage compensation circuit provides a compensation current signal and comprises a switchable compensation resistance network. The transimpedance amplifier provides the output voltage signal based on the difference between the transconductance amplifier current signal and the compensation current signal. The switchable compensation resistance network comprises a plurality of branches in parallel with each other, wherein each branch includes: a gain-mimicking switch that has a corresponding gain-setting switch in the switchable resistance network; and a leakage-current-conducting switch in series with the gain-mimicking switch. The leakage-current-conducting switch is openable and closable in accordance with the complement of a switch control signal that is used to control the gain-mimicking switch in the same branch.

The utility model relates to the technical field of optical modules, in particular to an optical module receiving device and an optical module.The optical module receiving device comprises a first optical path and a second optical path, the first optical path and the second optical path are arranged in a spaced mode, and the first optical path comprises a first optical assembly and a first secondary optical assembly which are arranged in a spaced mode; one side, close to the first secondary optical component, of the first optical component is provided with a filter; and the filter is used for transmitting light to the first secondary optical component and reflecting the light on the first optical component to the second optical path. The objective of the utility model is to solve the technical problems of large optical path coupling difficulty and high cost when a conventional optical module receiving device faces an eight-channel trans-impedance amplifier.

Memories might include a controller configured to cause the memory to perform a sensing operation on a plurality of selected memory cells while their common source is connected to a first input of a transimpedance amplifier (TIA) and while a switch between the first input and an output of the TIA, and connected in parallel with an impedance of the TIA, is closed; sample a current level from the common source to the first input of the TIA; isolate the common source from the TIA; and supply the sampled current level to the first input of the TIA while the switch is open to develop an output voltage level on the output of the TIA representative of the sampled current level. The controller might further be configured to cause the memory to convert the output voltage level to a digital value representative of the sampled current level.

A measurement system and method can include: a signal generator configured to provide a transmit voltage; a transmit electrode connected to the signal generator; a trans-impedance amplifier having a trans-impedance amplifier input and a trans-impedance amplifier output; a receive electrode connected to the trans-impedance amplifier input; voltage measurement circuitry configured to: acquire a transmit voltage measurement from a first connection connected between the signal generator and the transmit electrode and from a second connection connected to the trans-impedance amplifier input, and acquire a receive voltage measurement from a third connection connected to the trans-impedance amplifier input and from a fourth connection connected to the trans-impedance amplifier output; and a digital processing unit configured to determine an impedance based on the electrodes being in direct contact with a body, the impedance based on a ratio of the transmit voltage measurement and the receive voltage measurement.