130results 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.

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 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 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.

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.

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.

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.

To provide a current-to-voltage signal converter which may operate at an adjusted voltage.SOLUTION: A current-to-voltage converter includes a trans-impedance amplifier which converts a current input into a voltage output. The voltage output may operate around an undesirable predetermined voltage, and must therefore be adjusted in order to make it suitable for any downstream signal processing circuitry, such as an ADC. As such, a subtractor circuit is coupled to an output of the trans-impedance amplifier. At an input of the subtractor circuit, a voltage adjustment circuit is employed, to adjust a voltage input to the subtractor circuit. As such, the input to the subtractor is adjusted between a first predetermined voltage threshold and a second predetermined voltage threshold, and the subtractor circuit may therefore be a low-voltage component.SELECTED DRAWING: Figure 1

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).

The relay control system of the present application, the signal strength acquisition circuit acquires the amplitude of the relay input signal, and outputs to the attenuation amount calculation circuit after filtering and following, calculates the difference with the relay output standard signal, and obtains the attenuation amount added to the gate of the field effect transistor T1, controls the resistance between the drain and source of the field effect transistor T1, the amplifier amplification adjustment circuit adopts frequency selection to receive the relay input signal, and adds to the input end of the photoelectric coupler U1 through the amplification of the operational amplifier AR4, the amplified voltage controls the amplification multiple of the feedback control operational amplifier AR4, the resistance R15, the resistance R16 or the resistance R16 to ground in series, which is used to further adjust the input end voltage of the photoelectric coupler U1, so as to realize the two-stage dynamic adjustment of the amplification multiple, the amplifier power supply adjustment circuit receives the voltage after the voltage division of the resistance R8, the resistance between the drain and source of the field effect transistor T1 and the resistance R9, and adds to the control electrode of the thyristor BCR1, adjusts the output voltage of the thyristor BCR1, provides appropriate power supply for the operational amplifier AR4, and reduces the power consumption.

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.

A pulse current signal amplification circuit and its operating method are disclosed, comprising an APD module, a transimpedance amplifier module, an AC coupling module, and a reverse current cancellation module. The APD module is connected to the AC coupling module, the AC coupling module is connected to the transimpedance amplifier module, and the reverse current cancellation module is connected to the input and output terminals of the transimpedance amplifier module as its input terminals. To ensure that the DC bias voltage at the signal input terminal of the APD is adjustable and does not interfere with the DC bias voltage of the receiving circuit, AC coupling is used at the input. When a large signal is input, the AC coupling capacitor charges; after the signal ends, the AC coupling capacitor discharges, generating a reverse current that affects the circuit's operating state. This invention accelerates the recovery of the circuit from abnormal operating states. The reverse current cancellation circuit of this invention is configured to open an internal current path to compensate for the reverse current when the output potential of the transimpedance amplifier module is lower than that at the input terminal, thereby reducing the reverse current flowing through the transimpedance amplifier module and thus reducing the potential change at the output terminal of the transimpedance amplifier module.

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.