270results 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.

Disclosed is a method and standard module for amplifying pulsed power. The key point of the technical solution is as follows: a method for amplifying pulsed power is formed by means of the joint action of a LASER mode of a crystal medium, a carrier multiplication amplification mode of a semiconductor medium, and a plasma breakdown amplification mode of a gas medium. Electric power which is amplified is converted into optical power first, the optical power is amplified again, and the amplified optical power is converted into electric power again by a photoelectric conversion and amplification device. A gas switch is triggered based on a photoconductive switch to generate a timing-synchronized high-power electric pulse. The high-power electric pulse may be directly outputted or distributed in multiple channels to obtain multiple timing-synchronized trigger signals. In combination with pulse charge of a capacitor, multiple timing-synchronized high-power electric pulses are outputted.

A photoelectric conversion apparatus includes a pixel which includes a photoelectric conversion element; a signal line connected with the pixel; a voltage-current conversion unit configured to convert a voltage signal of the signal line into current; and a conversion unit that includes an oversampling type analog-to-digital conversion circuit that converts the current outputted from the voltage-current conversion unit into digital signals. The voltage-current conversion unit converts the voltage signal of the signal line into the current without sampling and holding and outputs the converted current to the conversion unit.

A fiber optic based sensing system and method includes a. functionalized optical fiber based sensor including an engineered sensing layer, a light source structured to generate light and couple the light into an input of the functionalized optical fiber based sensor, and an interrogator including a photodetector coupled to the functionalized optical fiber based sensor to receive transmitted or reflected tight, a transimpedance amplifier (TIA) circuit coupled to an output of the photodetector, a controller coupled to an output of the TIA circuit, and a transmitter (e.g., a wired or wireless transmitter) coupled to the controller.

An optical receiver includes a light receiving element, a capacitor, a transimpedance amplifier, and a base. The light receiving element includes a semiconductor layer, a first conductive film electrically connected to a cathode electrode, a second conductive film electrically connected to the first conductive film through a conductor, and an anode pattern electrically connected to an anode electrode. The transimpedance amplifier has a first pad electrically connected to the first conductive film through a first wire and a second pad electrically connected to the anode pattern through a second wire. The base has a main surface. An electrostatic capacitance between the second conductive film and the main surface of the base is larger than a parasitic capacitance between the first conductive film and the second conductive film, and the inductance of the conductor is smaller than the inductance of the first wire.

The optical module provided by the invention comprises a circuit board and an optical modulation chip. The light modulation chip comprises a first substrate and a second substrate which are oppositely arranged. A light modulator is arranged on the surface of the first substrate and used for modulating light signals. And a second coupling waveguide is formed on one side of the light modulator and is used for transmitting the light to be modulated into the light modulator. A light demodulator is arranged on the surface of the second substrate and used for demodulating light signals. An end face coupler is formed on one side of the light demodulator and used for receiving the light to be modulated and continuously transmitting the light to be modulated. A first coupling waveguide is formed on the other side of the optical demodulator. According to the optical modulation chip, the first substrate and the second substrate are mixed and integrated, and the optical modulator and the optical demodulator are arranged on the surfaces of the first substrate and the second substrate respectively, so that the advantages of the two substrates are brought into full play, and the modulation and demodulation performance of an optical module is improved. Meanwhile, transmission of optical signals is achieved through the end face coupler, the first coupling waveguide and the second coupling waveguide.

The invention relates to the technical field of low-temperature infrared radiation detection, and provides low-temperature infrared radiation detection equipment, which comprises a vacuum cold box, an infrared detection device, a control system and a signal processing system, and is characterized in that the infrared detection device comprises an infrared window sheet, an optical shutter, an optical lens, an optical chopper and an infrared detector; the optical chopper adjusts an infrared radiation signal emitted by a target object to a predetermined frequency, and the infrared detector receives the infrared radiation signal and converts the infrared radiation signal into an electric signal; the signal processing system comprises a pre-amplifier, a lock-in amplifier, a signal processing unit and a display unit, the pre-amplifier amplifies the electric signals output by the infrared detector, and the lock-in amplifier extracts signals corresponding to the preset frequency from the electric signals amplified by the pre-amplifier and amplifies the signals. Through the arrangement, the optical chopper, the pre-amplifier and the lock-in amplifier are combined, so that the measurement precision of infrared detection is effectively improved.

An assembly of electronic components for reception of data using an optical fibre wherein said assembly comprises: a photodiode; a first amplifier coupled to said photodiode; a second amplifier, whose electrical behaviour is substantially identical to an electrical behaviour of said first amplifier; an impedance network comprising at least two electronic components coupled between an input of said second amplifier and a reference terminal, wherein those at least two electronic components comprise at least two impedance elements, one impedance element being capacitive and another being resistive or inductive, and wherein said at least two electronic components are adjustable under electronic control to adjust the impedance presented by said impedance network; and circuitry for creating a signal formed from a subtraction of outputs of the first and second amplifiers.

An optical transmission module is provided, including: a substrate, a transmitting side and a receiving side. The substrate defines a thickness direction and includes a optical transmission channel and two refractive portions located at two opposite sides of the optical transmission channel, and each of the two refractive portions is provided with a progressive refractive index progressively increased or decreased in the thickness direction. The transmitting side includes an optical transmitter and a driver, and the optical transmitter is electrically connected with the driver by wire bonding. The receiving side includes an optical receiver and a transimpedance amplifier, and the optical receiver is electrically connected with the transimpedance amplifier by wire bonding. At least one of the optical transmitter and the optical receiver includes a light transmission face and a conductive surface, and each said light transmission face faces toward one of the two refractive portions.

This application provides a photoelectric amplification circuit and a signal processing method. The photoelectric amplification circuit includes a first photodiode and a second photodiode that are connected in parallel. A Doherty circuit structure is used, so that power supply efficiency of the photodiode in a back-off state can be improved. In addition, an impedance modulation unit is used, to implement dynamic load conversion from a back-off point to a maximum output point. This helps maintain high output efficiency of the first photodiode and the second photodiode in an interval between the maximum power point and the back-off point.

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.

The invention relates to an amplifier circuit (1) for broadband and low-noise amplification of a capacitive current source, preferably a thermoelectric sensor, comprising: a signal input (3) which can be connected to the capacitive current source in a node K1; the invention relates to an amplifier (1) for amplifying an input voltage, comprising an input stage (A1), which is connected to a node K1 at an input (7) of the input stage (A1) and has a node K2 at an output (9) of the input stage (A1), the input stage (A1) being designed to amplify the input voltage by at least three times, the input stage (A1) being designed to provide a high-ohm input resistance at the input of the input stage (A1), the input stage (A1) is designed to provide a stable and load-independent voltage at the output of the input stage (A1); the invention relates to a power amplifier comprising a first amplifier (A1) and a second amplifier (A3), an amplifier cascade (11) having at least a first amplifier and a second amplifier (A2, A3), each having an input (13, 17) and an output (15, 19), the output (15) of the first amplifier (A2) being connected in a node K3 to the input (17) of the second amplifier (A3), the input (13) of the first amplifier (A2) being connected to a node K2, the output (15, 19) being connected in a node K3 to the input (17) of the second amplifier (A3). An output (19) of the second amplifier (A3) is connected to a node K4, the amplifier cascade (11) being arranged to produce a high signal gain with a low phase shift over a wide frequency range; a feedback network (F1), which is connected to the input (7) of the input stage (A1) in a node K1 and to the output (19) of the second amplifier (A3) in a node K4, said feedback network (F1) being designed to provide a high-ohm feedback resistance with a parasitic capacitance of less than 0.5 pF, the feedback network (F1) is arranged to provide a negative feedback to a structure comprising the input stage (A1) and the amplifier cascade (11), and a signal output (21) connected to a node K5, which is connected to or corresponds to a node K4. The invention also relates to a sensor system.

An active clamp photoelectric sensing device includes an input terminal, a first output terminal, a current-to-voltage conversion circuit, and an active clamp circuit. The input terminal receives an input current. The first output terminal outputs a first output voltage. The current-to-voltage conversion circuit is coupled between the input terminal and the first output terminal, and is used to discharge and lower potentials of the input terminal and the first output terminal to a first set voltage according to the state of a reset signal, or is used to gradually increase the first output voltage to a second set voltage. The active clamping circuit is coupled to the current-to-voltage conversion circuit, and is used to clamp the upper limit of the first output voltage to the second set voltage.

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.

A transimpedance amplifier (TIA) for converting an input current at an input node into an output voltage at an output node, the TIA comprising: a first amplifier stage having a first input coupled to the input node and a first output; a feedback path between the first output and the first input; a second amplifier stage in the feedback path having a second input, the second input coupled to the first output of the first amplifier stage; a feedback resistor in the feedback path coupled between an output of the second amplifier stage and first input of the first amplifier stage; and an output stage, comprising: a load resistor coupled between a reference voltage node and a T-coil, the T-coil comprising first and second inductors coupled in series at an inductor node, the T-coil coupled between the first output and the load resistor, the inductor node coupled to the output node of the TIA.

The application provides a signal amplifier circuit and a display device. In the signal amplifier circuit, the gate of the drive transistor of the first inverter is connected to the output end of the reset module. When the impedance of the optoelectronic device changes, the potential of the gate of the drive transistor of the first inverter changes, causing potential changes at all nodes of the first inverter to amplify the signal.At the same time, the first compensation transistor is connected between the second gate of the first drive transistor and the first output node, the potential of the first output node is precharged to the second gate of the first drive transistor to adjust the threshold voltage of the first drive transistor, improve the difference in threshold voltage between different transistors, and solve the technical problem of signal unevenness after amplification by the inverter.

The invention discloses a transimpedance amplifier insensitive to high light intensity, which comprises an input signal amplification structure and a double-end output structure which are connected with each other, the double-end output structure is also connected with a current bias structure, and the current bias structure is used for providing stable bias current irrelevant to a triode amplification coefficient for the input signal amplification structure. And under the condition that no signal is input, the output reference voltage is equal to the output voltage, and the input signal amplification structure is used for providing a corresponding amplification factor for a wide-range input signal. According to the transimpedance amplifier insensitive to high light intensity, under the condition that the light intensity is large, the triodes enter a saturation region, the output voltage is divided by the resistors and clamped at the lowest output voltage, and the output voltage is prevented from being lower than the common-mode input range of a post-amplifier; when the input optical signal disappears, that is, the output signal is strained to be a high level, the level jump speed is improved through the rapid discharge path.

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.

The present invention relates generally to a method of use for photoelectric unit and an amplification apparatus thereof, and more specifically, to a method using a photoelectric unit to provide bias for a device that is configured to signal amplification, and an amplification apparatus with good performance. The photoelectric unit comprises a light-emitting element and a receiving element for the conversion of light energy into electrical energy, wherein the receiving element is an energy output element, and connected to a bias electrode of a device that is configured to signal amplification. The present invention is reasonable in design, using the photoelectric unit to provide bias energy, and has the advantage of good performance.

A charge-sensitive amplifier configured to receive an input charge signal from a radiation sensor includes a high-open-loop- voltage gain amplification stage including at least one of an operational amplifier and / or operational transconductance amplifier, a capacitive network electrically coupled between an input and an output of the high-open-loop- voltage gain amplification stage, and an active feedback circuit network electrically coupled between the input and the output of the high-open-loop-voltage gain amplification stage. The capacitive network provides integration of the input charge signal and conversion of the input charge signal to a voltage available at an output of the charge-sensitive amplifier.

To provide an interface circuit for photodiodes capable of making a circuit specification common when performing signal processing upon signals outputted from a plurality of photodiodes.SOLUTION: An interface circuit IFCP comprises a first operational amplifier OA1, a changeover switch SW, a first processor CPU1, and first and second potentiometers DP1 and DP2. A variable resistance region of the first potentiometer DP1 is larger than that of the second potentiometer DP2. The first and second potentiometers DP1 and DP2 are connected to the changeover switch SW. The first processor CPU1 operates the changeover switch SW so as to cause any one of the first and second potentiometers DP1 and DP2 to connect a first input terminal IN1 and a first output terminal OUT1 of the first operational amplifier OA1 according to a current signal I of a photodiode PD.SELECTED DRAWING: Figure 3

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.

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.

To provide a transimpedance amplifier that alleviates disturbance of frequency characteristics.SOLUTION: According to an embodiment, there is provided a transimpedance amplifier including: an input terminal; a first transistor having a source or an emitter connected to the input terminal; a first current-voltage conversion circuit connected to a drain or a collector of the first transistor; a first voltage-current conversion circuit and a second voltage-current conversion circuit that convert an input voltage corresponding to an output voltage of the first current-voltage conversion circuit into a current; an inverting amplifier circuit having an input node connected to the source or the emitter of the first transistor and an output node connected to a gate or a base of the first transistor; a second current-voltage conversion circuit that converts an output current of the second voltage-current conversion circuit into a voltage; and an output terminal that outputs the voltage converted by the second current-voltage conversion circuit.SELECTED DRAWING: Figure 1

The embodiment of the invention discloses an avalanche pulse signal extraction circuit and a photoelectric detector. The extraction circuit comprises an actual photoelectric receiving module, a first reference photoelectric receiving module, a second reference photoelectric receiving module, a first differential amplification module and a second differential amplification module, one end of the actual photoelectric receiving module and one end of the first reference photoelectric receiving module are electrically connected with two input ends of the first differential amplification module respectively; the output end of the first differential amplification module and one end of the second reference photoelectric receiving module are electrically connected with two input ends of the second differential amplification module respectively; and the other end of the actual photoelectric receiving module, the other end of the first reference photoelectric receiving module and the other end of the second reference photoelectric receiving module respectively receive power supply signals. According to the circuit, sunlight noise caused by external ambient light is effectively filtered, and bottom noise caused by electrical characteristics of an avalanche diode is inhibited.

Apparatus and methods for preventing overshoot for a high-to-low input current transient of a logarithmic transimpedance amplifier are disclosed. In certain embodiments, an amplifier system includes a logarithmic transimpedance amplifier having an input that receives an input current signal, and a current pulse injection circuit that injects a current pulse into the input of the logarithmic transimpedance amplifier in response to detecting a transition of the input current signal from a high current value to a low current value.

A microwave integrated circuit (1) includes: a semiconductor substrate (3); a plurality of amplification units formed in the semiconductor substrate; a wiring (W3) formed in one layer wiring (19c) other than the uppermost layer wiring (19d) and the lowermost layer wiring (19a) among the plurality of layer wirings (19a - 19d) formed on the semiconductor substrate and supplying power to the plurality of amplification units; a plurality of vias (21a) connecting a plurality of conductive regions (51) formed in the layer wiring (19c), the wiring being sandwiched between the plurality of conductive regions, other conductive regions (53, WG) formed in regions sandwiching the wiring in two layer wirings (19b, 19d) immediately above and immediately below the layer wiring (19c), each of the plurality of vias forming a via structure that is connected to conductive regions (55, 59) of the lowermost layer wiring through a plurality of other vias (21b, 21d).