195results 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.

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.

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.

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.

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.

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).

Provided is a comparator of an image sensor, the comparator including a first input transistor configured to receive a reference signal, a second input transistor configured to receive an input signal, a first load transistor configured to output a first output signal to a first output node based on a difference between the reference signal and the input signal, and a first cascode transistor coupled to the first input transistor and the first output node.

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 application relates to the field of optoelectronic technology and discloses a multi-frequency voltage amplification device applied to electro-optic modulation, which comprises a signal source, a primary structure, multiple secondary structures and a load end; the signal source is connected with the primary structure and is used for providing a multi-frequency excitation signal; the primary structure is used for generating an alternating electromagnetic field; the multiple secondary structures are respectively connected with the primary structure through electromagnetic coupling, each secondary structure resonates with the primary structure in a respective preset frequency range; and the load end is provided with multiple pairs of electrodes, each pair of electrodes is connected with one secondary structure and forms a multi-frequency mutual inductance structure. The application realizes impedance matching and voltage amplification under multiple working frequencies. Meanwhile, the etalon effect is reduced without changing the laser propagation direction.

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.

This invention discloses a bandwidth enhancement and dynamic pole tracking circuit for a high-speed burst-mode transimpedance amplifier, comprising a core loop module and a bandwidth enhancement module. The input terminal of the core loop module constitutes the input terminal of the transimpedance amplifier bandwidth circuit, and the output terminal of the core loop module constitutes the output terminal of the transimpedance amplifier bandwidth circuit. The core loop module and the bandwidth enhancement module are connected. The input terminal of the core loop module receives the current to be processed and, in conjunction with the bandwidth enhancement module, converts the current to obtain a corresponding voltage, which is output from the output terminal of the core loop module. This reduces the link bandwidth of the transimpedance amplifier bandwidth circuit for the current to be processed. This invention, through bandwidth enhancement and dynamic pole tracking circuitry, can ensure higher bandwidth across the entire dynamic range of the input signal, thereby achieving excellent bandwidth and sensitivity indicators, significantly improving chip security and signal transmission quality.

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.

The present disclosure relates to the field of amplifier circuits (driver amplifiers) for electro-optical modulators, in particular for amplifying an electrical signal for driving electro-optical modulators, an amplifier circuit (101) is proposed for amplifying a signal comprising a gain amplifier (102), a distributed amplifier (103), a resistor (Rg), and a current source (104), wherein the input of the distributed amplifier is electrically connected to the output of the gain amplifier; the resistor terminates the input of the distributed amplifier; and the current source is electrically connected in parallel to the resistor. A method of setting a bias voltage of such an amplifier circuit is also proposed. Furthermore, a transmitter, in particular an optical transmitter, comprising such an amplifier circuit and a system comprising such a transmitter and a signal source are also proposed.

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.