86results about "Amplifiers controlled by light" patented technology

A sensor and method for page-based optical data storage. The sensor includes a partially-reflective mirror, a reflective mirror disposed substantially collinear with and spaced apart from the partially-reflective mirror, and an active layer disposed substantially collinear with and between the partially-reflective mirror and the reflective mirror. The partially-reflective mirror has a first and second side and transmits a portion of light incident on the first side. The reflective mirror reflects light incident on the reflective mirror toward the partially-reflective mirror. The active layer absorbs at least a portion of the light oscillating at the resonant frequency.

Aspects of the subject disclosure may include, for example, first and second operational amplifiers; and a differential pair of NPN transistors in a feedback path of the TLA configured to convert an input current signal into an output voltage signal, where a first emitter of a first NPN transistor of the pair of NPN transistors is connected to an inverting input of the first operational amplifier, and where a second emitter of a second NPN transistor of the pair of NPN transistors is connected to a non-inverting input of the second operational amplifier. Other embodiments are disclosed.

The invention discloses a pulse wave signal detection-oriented transimpedance amplifier circuit with input voltage clamping and current offset functions, and relates to the technical field of integrated circuit design, the pulse wave signal detection-oriented transimpedance amplifier circuit comprises a pseudo-differential structure, a current offset module and a photosensitive diode, the pseudo-differential structure is composed of two independent operational amplifiers with double-end input and single-end output, the trans-impedance amplifier of a pseudo-differential structure composed of two independent operational amplifiers with double-end input and single-end output is used, the same voltage is connected to the same-direction input end of the trans-impedance amplifier, voltage clamping is carried out on double-end input, the differential mode precision and low-frequency stability of an input virtual site are improved, differential mode imbalance and flicker noise caused by operational amplifier mismatch are eliminated, and the stability of the trans-impedance amplifier is improved. The dynamic range of the pulse wave detection system is improved, and the pulse wave detection system has the advantages of high-precision and wide-range ambient light suppression effect, high circuit reliability, low circuit complexity, easy implementation, high loop stability, small area and low power consumption.

A readout circuit (110) is proposed. The readout circuit (110) is configured to convert an analog sensor charge (112) into a digital output count (114). The readout circuit (110) comprises at least one integrate and fire (IAF) circuit (116). The IAF circuit (116) is configured to convert the analog sensor charge (112) into a first digital output count (118). An analog voltage residue (120) after the last IAF cycle is further processed. The readout circuit (110) includes at least one analog-to-digital converter (ADC) (122). The ADC (122) is configured to convert the analog voltage residue (120) into a second digital output (124). Furthermore, the input charge to the readout circuit is a photodetector (182), and a method of readout of the analog sensor charge (112) is proposed.

Particular embodiments disclosed herein provide a surgical laser system comprising a laser source, a lens, a memory, and a processor in data communication with the memory and configured to execute instructions which cause the processor to control the laser source based on a detection signal received from a circuit. The circuit comprises a first amplifier, a second amplifier, and a switch coupled between the second amplifier and a reference potential node and whose state is based on an output of a first comparator. The circuit further comprises a second comparator coupled to the second amplifier and a logic gate coupled to the first comparator and the second comparator.

An amplifier arrangement for providing a variable electrode voltage to an ion optical device. The amplifier arrangement comprises a high speed amplifier designed to receive an input signal to the amplifier arrangement and provide a low voltage output, and a low speed adjustable voltage source arranged to float above the low voltage output and configured to provide a high voltage output of the amplifier arrangement. The high voltage output of the amplifier arrangement is fed back to control the high speed amplifier. Advantageously, the amplifier arrangement forms part of a power supply for providing a varying electrode voltage, for example as part of an ion analysis system.

The invention relates to the field of integrated circuit design, in particular to a burst mode trans-impedance amplifier circuit for a 50G PON (Passive Optical Network), which comprises a high-frequency signal main circuit and a quick response auxiliary circuit, and the high-frequency signal main circuit realizes high-sensitivity amplification of low-optical-power signals and low-gain amplification of high-optical-power signals through the variable-gain transimpedance-stage amplification circuit and the amplitude-limiting post-stage amplification circuit. The quick response auxiliary circuit realizes ordered quick gain control and quick direct current bias elimination through a quick average value detection circuit controlled by different reset signals generated by the two circuits, and realizes quick response to burst signals together with the high-frequency signal main circuit. The device has the characteristics of high bandwidth, quick response and the like, can stably convert and amplify 50Gbps burst signals, and is suitable for a 50G PON uplink burst mode optical receiver system.

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 a bidirectional optical parameter phase-sensitive amplifier system for high-precision optical frequency transmission, which comprises an uplink transmission link, a downlink transmission link and a detection link, the uplink transmission link is used for amplifying an optical signal when the optical signal to be amplified is input from the first optical signal input / output port and outputting the optical signal from the second optical signal input / output port; the downlink transmission link is used for amplifying an optical signal when the optical signal to be amplified is input from the second optical signal input / output port and outputting the optical signal from the first optical signal input / output port; and the detection link is used for performing beat frequency measurement and phase locking on an optical signal input from the first optical signal input / output port and an optical signal input from the second optical signal input / output port so as to eliminate extra noise introduced due to different transmission paths in the uplink and downlink amplification process. According to the invention, an extremely low noise amplification effect can be realized, the signal-to-noise ratio loss generated in the transmission process is effectively reduced, and the transmission distance is increased.

The invention discloses a cascade and cross-coupling bandwidth trans-impedance amplifier for visible light communication, which adopts a fully differential topological structure and consists of a cascade enhanced input stage, an active current source load and a cross-coupling bandwidth compensation network, an enhanced feedback loop is constructed in a multi-stage cascade mode; a multi-stage common-source amplifier is connected in series in a feedback path of an input end; replacing a traditional resistive load with a current source: replacing a common-gate load resistor with the current source; the differential output end of the circuit is connected with a pair of cross coupling transistors, and the grid electrodes and the drain electrodes of the transistors are connected in a cross mode to form a positive feedback mechanism. The invention provides a novel RGC-TIA structure adopting optimized bias and cascade feedback, and by breaking through voltage margin limitation, high gain, wide bandwidth and good linearity and common-mode rejection performance are realized at the same time.

Systems and methods of microscopy include and / or apply a laser light source configured to produce an excitation light; a modulator configured to modulate the excitation light to produce a modulated light; a pulse compressor configured to compress a pulse of the modulated light to produce a pre-compensated light; a beam scanner configured to raster scan the pre-compensated light on a sample; a detector configured to receive a light signal from the sample and produce a detection signal; and a lock-in amplifier configured to receive the detection signal and perform an electronic heterodyne amplification of the detection signal.

This application relates to transimpedance amplifier circuits, which include a frontend amplifier (103) that receives an input current (IIN) and output a corresponding voltage (VTIA), and a processing stage (302) configured to process the voltage output from the frontend amplifier. The application relates to amplifier circuit in which the processing stage has a filter (303) with a frequency response (305) with a local minimum. The transimpedance amplifier circuit may be used to process a signal comprising data within a data frequency band and the filter may be configured such that the local minimum is within the data frequency band. The filter response at least partly compensates for a resonant peak in the frequency response (304) from the frontend amplifier due to an expected resonance at the input to the frontend amplifier.

Provided is a weak-signal reading circuit for a sensor, comprising a sensing signal input amplifying unit and a signal reading unit. The sensing signal input amplifying unit comprises a first transistor, wherein a gate and a drain of the first transistor are connected with a sensor; the signal reading unit is connected to a source of the first transistor, the first transistor is turned on when the sensor generates a sensing signal, so that the sensing signal is captured by the signal reading unit. When the sensor senses a signal and generates a voltage, the first transistor tends to be switched on, then the signal reading unit reads the sensing signal through the first transistor which has been turned on, that is, by providing the first transistor, the weak-signal reading circuit for sensor can be self-driven according to the voltage generated by the sensor without an extra drive circuit, thereby achieving low power consumption.

The application discloses a kind of SOA current automatic control circuit, method and optical module, SOA current automatic control circuit, comprising: SOA, photoelectric conversion circuit, voltage monitoring circuit, SOA drive circuit, the SOA is used to amplify input optical signal, the photoelectric conversion circuit is used to receive the optical signal after SOA amplification, and the amplified input optical signal is converted into electrical signal, the voltage monitoring circuit is used to monitor the electrical signal output by photoelectric conversion circuit, and according to the electrical signal monitored, the voltage size input to SOA drive circuit is automatically controlled, the SOA drive circuit is used to amplify the voltage signal output by voltage monitoring circuit, and automatically adjust the current size of SOA according to the voltage signal output by voltage monitoring circuit.The application adopts the mode of automatically controlling SOA current, to improve product efficiency and increase product reliability.

Logarithm (100) comprehensive an input amplifier (101), a logarithmic component (102), and a feedback capacitor (103) which is designed to stabilize the logarithm (100), characterized by the fact that the logarithm (100) comprises a switching device (110), and the feedback capacitance (103) is divided into a plurality of n partial feedback capacitances (103a, 103b, 103c) connected in parallel, wherein a first partial feedback capacitor (103a) is a permanently stabilizing component of the logarithm converter (100), and wherein a number of n-1 of the n partial feedback capacitors (103a, 103b, 103c) are switchable partial feedback capacitors (103b, 103c), wherein the n-1 partial feedback capacitors (103b, 103c) can be switched on separately as stabilizing components in addition to the first partial feedback capacitor (103a), and where the switching device (110) is configured to individually switch the n-1 switchable partial feedback capacitors (103b, 103c) depending on an input current (I Ph ) of the logarithm (100) to be automatically switched on or off and thus depending on the input current (I Ph ) of the logarithm (100) automatically increases or decreases an effective feedback capacity (103) with which the logarithm (100) is stabilized, wherein the effective feedback capacitance (103) corresponds to a sum of the first partial feedback capacitance (103a) and all switched-on switchable partial feedback capacitances (103b, 103c), and wherein the switching device (110) comprises • at least one reference current source (111, 111a, 111b), • at least one reference transistor (112, 112a, 112b), • at least one switching amplifier (113a, 113b), and • at least one switch (114a, 114b).

Systems for detecting light (e.g., in a flow stream) are described. Light detection systems according to embodiments include a photodetector, an input modulator configured to modulate signal input into the photodetector and an output modulator configured to modulate signal output from the photodetector. Photodetector arrays having a plurality of light detection systems, e.g., as described, are also provided. Methods for matching output signals from two or more photodetectors (e.g., a plurality of photomultiplier tubes in a photodetector array) are also described. Flow cytometer systems and methods for detecting light from a sample in a flow stream are provided. Aspects further include kits having two or more of the subject light detection systems.

An optical sensor circuit for improved background signal cancellation in a musical instrument pickup. An operational amplifier is configured as a transimpedance amplifier (TIA). The TIA is electrically coupled to a first photodetector and a second photodetector in a series connection wherein the anode of the first photodetector and the cathode of the second photodetector are electrically coupled to define a connection node that is electrically coupled to an input of the TIA. In this configuration, symmetric in-band and out-of-band background optical signals and symmetric DC signals received by the pickup are negated. Asymmetric non-DC signals that are output from the photodetectors are passed to the input of the TIA as a signal of interest generated at the connection node.

To provide a transimpedance amplifier circuit capable of amplifying current with low noise and high magnification, and a measuring instrument equipped therewith. [Solution] A transimpedance amplification circuit comprising: a first transimpedance amplifier that converts current to voltage; and at least one circuit block connected downstream of the first transimpedance amplifier, wherein each circuit block includes a conversion circuit that converts voltage to current, and a second transimpedance amplifier connected downstream of the conversion circuit that converts current to voltage. A measuring instrument comprising the transimpedance amplification circuit.

In an embodiment, a system includes: an analog-to-digital converter (ADC); a receiver path including a transimpedance amplifier having an output coupled to the ADC; and a controller coupled to the receiver path and configured to, upon detection of a jamming event of the receiver path, cause an increase in a transconductance of the transimpedance amplifier from a first transconductance value to a second transconductance value.

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.

A method for adjusting the sensitivity of a photodiode in a light detection system is provided. [Solution] According to certain embodiments, a method includes detecting light with a light detection system having a photodiode and an amplifier, determining the responsivity of the photodiode across multiple wavelengths of light, and adjusting one or more parameters of the amplifier in response to the responsivity of the photodiode across the multiple wavelengths of light. A system (e.g., a particle analyzer) having a light source and a light detection system including a photodiode and an amplifier for practicing the subject methods is also described. A non-transitory computer-readable storage medium is also provided.

An optical receiver comprising a light-receiving element, a capacitor, a transimpedance, and a base. The light-receiving element comprises: a semiconductor layer; a first electrically conductive film electrically connected to a cathode electrode provided on a major surface of the semiconductor layer; a second electrically conductive film provided on the reverse side of the semiconductor layer from the major surface and electrically connected to the first electrically conductive film via an electrical conductor; and an anode pattern electrically connected to an anode electrode provided on the major surface of the semiconductor layer. The transimpedance includes a first pad electrically connected to the first electrically conductive film via a first wire, and a second pad electrically connected to the anode pattern via a second wire. The base has a major surface on which the light-receiving element and the transimpedance are mounted. A capacitance between the second electrically conductive film and the major surface of the base is greater than a parasitic capacitance between the first electrically conductive film and the second electrically conductive film, and an inductance of the electrical conductor is smaller than an inductance of the first wire.

This invention discloses a 25Gbps transimpedance amplifier with current compensation to improve overload performance. The current compensation circuit (CMP) is part of the 25Gbps transimpedance amplifier. The main link of the transimpedance amplifier consists of a core amplifier (Tia_core), a single-ended to differential amplifier (S2D), an output buffer, an automatic gain control (AGC) circuit, the current compensation circuit (CMP), and a mirror transimpedance amplifier (Dummy_tia) module. The input current signal is converted into a single-ended voltage signal by the core amplifier (Tia_core), and then the single-ended to differential amplifier (S2D) converts the single-ended signal voltage into a differential voltage. The output buffer transmits this differential signal to the next stage chip, ensuring impedance matching during transmission. The automatic gain control (AGC) circuit automatically adjusts the gain of the core amplifier (Tia_core) circuit according to the input current amplitude. The current compensation circuit (CMP) included in this invention can effectively prevent the transimpedance amplifier link from over-saturating and causing signal distortion when the input current signal is a large signal at the mA level, thus significantly improving the overload performance of the transimpedance amplifier.

The utility model discloses an isolation amplifier, and belongs to the technical field of amplifiers. The isolation amplifier comprises a four-path amplifier, a single-path amplifier, a first resistor, a feedback resistor, a first photoelectric coupling element and a second photoelectric coupling element, an inverted input end of the four-way amplifier is connected with a bias regulator at a high-voltage side and is connected with a signal input end through a first resistor, an in-phase input end of the four-way amplifier is connected to an inverted input end of the four-way amplifier through a photosensitive element of a second photoelectric coupling element, and an output end of the four-way amplifier is connected with a light-emitting element of the second photoelectric coupling element; the inverting input end of the single-path amplifier is connected with a bias regulator at a low-voltage side, and the non-inverting input end of the single-path amplifier is connected to the inverting input end of the single-path amplifier through a photosensitive element of the first photoelectric coupling element; the inverted input end of the single-path amplifier is connected to the output end of the single-path amplifier through a feedback resistor. According to the utility model, the problems of non-linear distortion, limited common-mode rejection capability and the like generally existing in multiple channels of the traditional isolation amplifier in the prior art are effectively solved.

An apparatus includes a transimpedance amplifier (102) having at least one input (302) and an output (306). The apparatus also includes at least one controllable first current source (202) configured to control at least one input current to a selected input current provided to the at least one input (302) of the transimpedance amplifier (102). The at least one controllable first current source (202) may connect to the at least one input (302) of the transimpedance amplifier (102) and may be configured to drain a DC current from the at least one input current applied to the at least one input (302) of the transimpedance amplifier (102). The apparatus may include a second current source (202B), a first resistor connected between a first input (302) of the at least one input of the transimpedance amplifier (102) and the second current source (202B), and a second resistor connected between a second input (304) of the at least one input of the transimpedance amplifier (102) and the second current source (202B).

An optical receiver comprises a photodiode; a transimpedance amplifier (TIA) coupled to the photodiode; a feedback amplifier coupled to an output stage of the TIA; and detection circuitry. The detection circuitry comprises (i) a slope detection circuit coupled to the feedback amplifier and (ii) a logic circuit coupled to the slope detection circuit and the output stage of the TIA. The slope detection circuit is configured to monitor a feedback signal from the feedback amplifier and detect a rate of change in the feedback signal of the feedback amplifier, and provide, in response to the rate of change in the feedback signal being detected, a first slope-status signal indicating the slope is detected. The logic circuit is configured to squelch the output stage of the TIA in response to the first slope-status signal.

The embodiment of the invention discloses a wide-range pre-amplification circuit with a temperature compensation function and photoelectric detection equipment. The wide-range pre-amplification circuit comprises a cross-group amplification module, a filtering module and a logarithmic amplification module which are connected in sequence; for a weak light current signal in a large dynamic range, a transimpedance amplification module is designed by using an operational amplifier to carry out I / V conversion circuit, so that signal distortion caused by parasitic capacitance and gain resistance of a photoelectric conversion device is avoided; a logarithmic amplification module and a temperature compensation module designed by using a cut-off and amplification region of a triode are used for performing piecewise linear amplification on a voltage signal output by a transimpedance amplification module, high gain is used for amplifying when a small signal is input, and low gain is used for amplifying when a large signal is input so as to meet the input range of a high-precision ADC; the problem of high-precision measurement of wide-range weak signals is solved, and the temperature stability of the double-slope logarithmic amplification circuit is improved by utilizing the temperature compensation module.

To provide a transimpedance amplifier circuit capable of amplifying current with low noise and high magnification, and a measuring instrument with the transimpedance amplifier circuit. A transimpedance amplifier circuit includes a first transimpedance amplifier that converts current to voltage; and one or more circuit blocks connected to an output side of the first transimpedance amplifier. Each of the circuit blocks includes a conversion circuit that converts the voltage to current, and a second transimpedance amplifier connected to an output side of the conversion circuit that converts the current to voltage. A measuring instrument includes the transimpedance amplifier circuit.

This invention discloses a signal strength indication circuit for a burst-mode transimpedance amplifier chip, belonging to the field of integrated circuit technology. The circuit includes a first feedback loop, a second feedback loop, a loop state bias current circuit, and peripheral circuitry. Operational amplifiers OPA1 and OPA2 clamp the node voltage, and current mirror transistors MN2 and MN3 pre-establish the loop state. MN4 and MP3 are introduced to avoid dark current misjudgment. Within the input current IPINK range from sensitivity to overload, the output current IMON response time is less than 1 μs, and the output current is consistently less than 1 nA when IPINK = 0, meeting the testing requirements of optical module manufacturers. This application solves the problems of slow response time and dark current misjudgment in existing technologies, significantly improving the reliability and stability of optical communication systems.