62 results about "Trans impedance amplifier" patented technology

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 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.

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 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 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.

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.

The invention relates to the technical field of integrated circuit design, in particular to an APC adjusting circuit and method. The logarithmic converter is used for replacing a trans-impedance amplifier TIA, so that the extraction of the current IPD of the monitoring diode MPD is realized, and the logarithmic conversion of the IPD is realized; the target optical power AOPdBm is converted into the target MPD current in the linear relation, debugging is visual and convenient, and the problem of large errors under low optical power is solved.

The invention discloses a photoelectric co-packaging structure which comprises a substrate, a photon integrated circuit and a trans-impedance amplifier. The transimpedance amplifier is arranged on the first surface of the photon integrated circuit, the photon integrated circuit is arranged on the second surface of the substrate, the first surface of the photon integrated circuit and the second surface of the substrate are oppositely arranged, the second surface of the substrate is concavely provided with a first accommodating space, and at least part of the transimpedance amplifier is accommodated in the first accommodating space. In the photoelectric co-packaging structure, through the position layout of each device, the routing path can be reduced, so that the distortion and delay of a high-frequency signal are reduced, the link energy consumption is reduced, the signal transmission rate can be effectively improved, and the requirement of a data center for the transmission capacity is met. Meanwhile, due to the position and structural design of all the devices, at least part of the trans-impedance amplifier can be contained in the first containing space, and miniaturization design of the packaging structure is facilitated.

According to the single-photon ranging laser radar receiving device, a first pulse signal generated by an SPAD quenching circuit passes through a current generator and a trans-impedance amplifier and then is converted into a voltage waveform signal, a peak holder monitors and tracks a detected highest peak to obtain a shaped signal, an alternating current coupling circuit tracks a derivative of the shaped signal, and the shaped signal is transmitted to the SPAD quenching circuit. A comparator triggers a multi-hit TDC to store TOF information, and at the end of a frame (before next laser shooting), the uniquely stored TOF value is the TOF of the last event, namely the highest signal peak value detected in the current frame. The scheme does not need to collect histograms, does not need to store more TOF data in each frame, does not need to execute post-processing, can work in a single shooting state, and avoids repetition of laser on the same point of a scene, thereby improving the scene acquisition rate of the scanning single-point laser radar.

The application relates to a power consumption monitoring circuit and a temperature compensation method applied to a large-array image sensor and belongs to the technical field of image sensors. The application comprises a transimpedance amplifier, a modulator, a multiplier, a selector, an analog-to-digital converter, a temperature sensing circuit and a band gap reference circuit; the band gap reference circuit is connected with the transimpedance amplifier, the modulator, the temperature sensing circuit and the analog-to-digital converter respectively and provides a power supply reference signal; the output end of the temperature sensing circuit is connected with the input end of the selector, and temperature compensation is provided through the output signal of the temperature sensing circuit. The application provides temperature compensation through multiplexing of the band gap reference circuit and the ADC, improves the temperature stability of the whole power consumption monitoring circuit without increasing the circuit complexity, and realizes the synergistic optimization of the temperature compensation and the power consumption monitoring function.

The application belongs to the technical field of analog integrated circuit design, and discloses a transimpedance amplifier based on a three-stage amplifier and a feedforward inverting amplifier, which comprises a first-stage amplifier, a second-stage amplifier, a third-stage amplifier, a feedforward inverting amplifier and a Miller compensation circuit; the first-stage amplifier, the second-stage amplifier and the third-stage amplifier are connected in series in sequence, the feedforward inverting amplifier is connected with the input end of the first-stage amplifier and the output end of the third-stage amplifier respectively; and the Miller compensation circuit is connected with the second-stage amplifier in parallel; the application can enable the transimpedance amplifier to realize high gain, high bandwidth and high stability at the same time.

A micro-electro-mechanical system (MEMS) apparatus includes at least one semiconductor device, a power supply, a transimpedance amplifier, a lock-in amplifier, a signal analyzer, and a processor. The semiconductor device has a MEMS structure, an input electrode, and two anchors. The two anchors of the MEMS structure are respectively fixed and could serve as output electrodes, the input electrode is adjacent to a long side of the MEMS structure, and the MEMS structure includes five sections having different widths. The power supply is electrically connected to the input electrode. The transimpedance amplifier is electrically connected to the output electrode. The lock-in amplifier is electrically connected to the transimpedance amplifier and the input electrode. The signal analyzer is electrically connected to the transimpedance amplifier. The processor is electrically connected to the signal analyzer.

The embodiment of the invention provides a signal processing method and system for a capacitive accelerometer of a micro electro mechanical system, and the method comprises the steps: detecting a capacitance change caused by acceleration through a differential capacitance structure, and obtaining a differential capacitance variation; inputting the differential capacitance variable quantity into a trans-impedance amplifier, converting the differential capacitance variable quantity into voltage change data, and superposing the voltage change data with a direct current bias voltage to generate a baseband modulation signal; a square wave carrier generation unit generates a square wave carrier signal, and modulates the baseband modulation signal and the square wave carrier signal to generate a modulation signal; synchronously demodulating the modulation signal through an annular diode demodulation circuit and outputting two paths of signals; performing low-pass filtering on the two paths of signals to filter out high-frequency carrier components and reserve low-frequency acceleration signals; and carrying out differential operation on the two paths of filtered signals, outputting a target voltage signal which is in a linear relation with the acceleration, and carrying out constant gain conversion by maintaining the signal processing link.

The embodiment of the application discloses a trans-impedance amplifier and a control method thereof, and is applied to the technical field of circuits. The trans-impedance amplifier TIA comprises an inverting amplifier circuit and a voltage clamping circuit. The inverting amplifier circuit and the voltage clamping circuit are connected in parallel. The inverting amplifier circuit comprises a first PMOS tube and a first NMOS tube with a common gate. The source of the first PMOS tube is connected with the drain of a second NMOS tube. The voltage clamping circuit comprises a second PMOS tube and a second NMOS tube with a common gate. The gates of the two are connected with the input end of the TIA. The source of the second NMOS tube and the drain of the second PMOS tube are connected with the output end of the TIA. The voltage clamping circuit can provide a compensation current, so as to avoid that the output voltage of the trans-impedance amplifier is too high or too low. In this way, the voltage difference between the source and the drain of the first PMOS tube and the first NMOS tube can be controlled, so as to avoid overvoltage phenomenon, thereby prolonging the service life of the first PMOS tube and the first NMOS tube.

The utility model discloses an optical engine based on the CPO technology, which relates to the technical field of optical communication, and is characterized by comprising a transmitting end module, a receiving end module, a PCB (printed circuit board), an optical fiber connecting line assembly and a shell 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 invention discloses an electrochemical sensor control circuit and system. The control circuit comprises a bias driving module which is electrically connected with a counter electrode and a reference electrode of the electrochemical sensor and is used for outputting a driving signal to the counter electrode so as to maintain a constant potential difference between the reference electrode and a working electrode of the electrochemical sensor; the input end of the transimpedance amplifier module is connected to the working electrode of the electrochemical sensor, and the transimpedance amplifier module is used for converting a current signal generated by the working electrode into a voltage signal; the dynamic feedback module is connected between the output end and the input end of the transimpedance amplifier module and is used for switching feedback impedance of the transimpedance amplifier module, so that the bias control circuit alternately works in a bias maintenance mode and a data acquisition mode; the input end of the analog-to-digital converter is connected to the output end of the transimpedance amplifier module, and the analog-to-digital converter is used for collecting the voltage signal output by the transimpedance amplifier module in the data collection mode. According to the invention, the tolerance of the sensor to abnormal electric leakage can be greatly improved.

The application provides a zero-phase switchable photoelectric encoder chip device, which mainly comprises an incremental code channel photoelectric diode (PD) array (1), a zero signal detection photoelectric diode (PD) array (2), a trans-impedance amplifier (TIA) array (3), a switch unit array (4), a control switch circuit (5) and a photoelectric encoder chip (6). The application can effectively solve the precision loss problem caused by the phase error of the incremental signal and the zero signal of the photoelectric encoder chip in the actual application process, can effectively improve the fault tolerance and reliability of the photoelectric encoder system, and can be widely applied in the fields of industrial automation, medical equipment, aerospace and the like.

The optical module provided by the utility model comprises a circuit board which is provided with a limiting amplifier and a reset signal generation circuit; the light receiving component comprises a photoelectric detector and a trans-impedance amplifier, the photoelectric detector is used for receiving burst light receiving signals, the input end of the trans-impedance amplifier is electrically connected with the photoelectric detector, and the output end of the trans-impedance amplifier is electrically connected with the limiting amplifier; the reset signal generation circuit comprises: a time delay sub-circuit, the input end of which is used for inputting a detection signal and performing time delay processing on the detection signal; the exclusive-OR gate comprises a first input end and a second input end; the first input end is used for inputting a detection signal, and the second input end is connected with the output end of the delay sub-circuit; the output end of the exclusive-OR gate is connected with the reset input end of the transimpedance amplifier, and the exclusive-OR gate outputs a first reset signal based on a detection signal and a delayed detection signal, so that the transimpedance amplifier is reset based on the first reset signal. And rapid resetting of the transimpedance amplifier is facilitated.