14 results about "Cascade amplifier" patented technology

A cascade amplification circuit module based on complementary parameter amplifiers belongs to the technical field of integrated circuit amplifiers and comprises a first-stage complementary parameter amplifier (CPA) and a second-stage amplifier (floating inverting type or transconductance resistance type). The first-stage CPA adopts an NMOS and PMOS complementary structure, passive amplification is achieved through grid multiplexing, a grid capacitor is used for storing signals in the sampling stage, a depletion layer capacitor is switched to improve gain in the amplification stage, common-mode voltage is stabilized through complementary design, and an extra feedback circuit is not needed. And the second-stage amplifier provides driving capability and is combined with passive gain to suppress noise. The cascade structure does not need frequency compensation, the design is simplified, the problem of balancing gain, noise and power consumption of a traditional amplifier is solved, and the cascade amplifier has the advantages of being high in energy efficiency and low in complexity.

The embodiment of the present disclosure provides a low-offset circuit structure with a cascade amplifier, comprising: an amplification link comprising cascaded amplifiers, a first-stage amplifier for receiving a radio frequency input signal, and a last-stage amplifier for outputting a radio frequency output signal; a rectifier comprising a first input end and a second input end, connected with a non-inverting output end and an inverting output end of the amplifier respectively, and outputting a detection signal; a calibration circuit comprising a logic circuit, connected with an output end of the rectifier, generating a target calibration signal based on a detected offset voltage and an initial calibration signal, and when the detected offset voltage reaches a preset value, a corresponding initial calibration signal is used to determine the target calibration signal; the calibration circuit further comprises a current output unit for outputting a compensation current to a second target amplifier based on the target calibration signal. The embodiment of the present disclosure can reduce the offset voltage of the circuit structure and improve the stability and dynamic response performance of the circuit.

The invention relates to the technical field of electrophysiological signal recording and stimulation of cerebral neurons, in particular to a distributed electrophysiological signal recording and stimulation system for cerebral neurons. The system comprises a recording path and a stimulation path, wherein the recording path is composed of an analog switch, a multi-stage cascade amplifier, a plurality of analog-to-digital converters, an FPGA main control board and a computer, and electrophysiological signals are collected and uploaded; the stimulation channel is composed of the computer, the FPGA main control board, a digital-to-analog converter and the analog switch and is used for issuing an electrical stimulation signal; wherein the amplifier, the converter and the power supply module are integrated on an independent PCB (Printed Circuit Board) and are connected with the FPGA main control board through an FMC (Frequency Management Controller) interface. The system configures the oversampling multiplying power of the analog-to-digital converter through the FPGA main control board so as to optimize the actual sampling rate and the signal-to-noise ratio. According to the invention, integration of acquisition and stimulation functions, hardware modularization and dynamic adjustment of signal quality are realized, and the flexibility and signal fidelity of the system are improved.

This invention discloses a low-noise amplifier and receiving system. The low-noise amplifier includes: an input matching circuit, a primary circuit, an interstage matching circuit, a secondary circuit, an output matching circuit, and a common bias circuit. The input matching circuit is connected to the primary circuit and the common bias circuit; the interstage matching circuit is connected to the primary circuit and the secondary circuit; the secondary circuit is connected to the common bias circuit and the output matching circuit; the common bias circuit is connected to a power supply; and the power supply voltage is connected to the primary circuit and the secondary circuit. For the primary and secondary amplifier circuits used to amplify signals, the active bias structure of the common bias circuit effectively reduces the number of components in the multi-stage cascaded amplifier circuit, thereby reducing the overall chip area and mitigating the coupling and parasitic risks caused by component layout and wiring within a limited layout area.

This 2μm single-frequency pulsed laser, based on synchronous modulation and solid-state graded-doping, comprises a fiber-optic synchronous modulation cascaded amplifier and a solid-state non-uniformly graded-doped two-way amplifier. Synchronous modulation in the fiber section suppresses noise, improving the signal-to-noise ratio and solid-state amplification efficiency. The non-uniformly graded-doped gain crystal group in the solid-state section enables small-signal amplification, high-energy extraction, and high amplification efficiency. This allows for high-efficiency, high-repetition-rate, high-energy, narrow-linewidth pulsed laser output in the tens to hundreds of millijoules range, significantly improving the detection accuracy and capability of radar systems.

The application discloses a light source device, a system and a water window band full-coherent free electron laser generating method. The device comprises: a harmonic generation unit for connecting an electron beam and a seed laser and generating low-order harmonics; at least two cascaded amplifier units connected with the harmonic generation unit, for connecting the low-order harmonic radiation and generating coherent harmonic radiation, and for tuning the coherent harmonic laser to high-order harmonic radiation to obtain water window band full-coherent free electron laser pulses. The application constructs a multi-stage amplifier unit in the rear stage of the harmonic generation unit, and each subsequent amplifier unit is configured to resonate on a high-order harmonic of the radiation output by the previous amplifier unit, so that the harmonic radiation of the previous stage is used as the effective seed of the subsequent stage, the frequency is up-converted stage by stage, the frequency of the coherent radiation is converted to the target high-order harmonic stage by stage, and the water window band full-coherent free electron laser is obtained.

An amplifier circuit comprises a multi-stage amplifier having a plurality of amplifiers cascaded between an input port Vin and an output port Vout to form a differential input stage and N subsequent gain stages, a capacitive load CL coupled to the output port Vout, and a compensation network coupled to the multi-stage amplifier and configured for positioning Pole-Zero pairs of each stage of the multi-stage amplifier below a unity gain frequency ωt of the multi-stage amplifier when compensated, with Zeros positioned lower than Poles so as to increase the unity gain frequency ωt.

The application discloses a kind of multi-mode dual-frequency low-noise amplifiers, chip and equipment, wherein amplifier adopts three-stage cascade amplifier topological structure design, including: first common-source common-gate amplifier, input adopts broadband input matching, output end adopts inductive switching module as load;Different inductance values are switched by bias voltage control inductive switching module;Second common-source common-gate amplifier, its load adopts reconfigurable dual-frequency load of inductive coupling;The frequency response of reconfigurable dual-frequency load is switched by bias voltage control;Third common-source common-gate amplifier, switch wave trap module is arranged between common-source common-gate amplifier;The working state of switch wave trap module is controlled by bias voltage.This application realizes multi-mode dual-frequency switching by controlling corresponding bias in variable inductance, reconfigurable dual-frequency load and switch inductive capacitance wave trap module, i.e.it realizes the switching between broadband, parallel and reconfigurable dual-frequency.The application can be widely applied in mobile communication technology field.

The application provides a high-speed high-voltage comparator suitable for an analog-digital conversion circuit, comprising a front signal voltage conversion module, a middle signal amplification module and a rear signal latch module connected in sequence; the devices contained in the front signal voltage conversion module are high-voltage devices, receive a high-voltage input signal, convert the high-voltage input signal into a low-voltage input signal and send the low-voltage input signal to the middle signal amplification module; the middle signal amplification module comprises multiple cascaded amplifiers, the devices contained in the middle signal amplification module are low-voltage devices, the low-voltage input signal is amplified and processed to generate an intermediate analog signal which is sent to the rear signal latch module; the devices contained in the rear signal latch module are low-voltage devices, the intermediate analog signal is converted into a digital signal by the clock signal and outputted. The high-speed high-voltage comparator can meet the application requirement of high speed and high voltage, has small noise, small mismatch and strong anti-interference ability.

The invention provides a cascade amplifier and a laser generation device, and the cascade amplifier comprises N stages of multi-optical-path amplification units which achieve the amplification of a to-be-amplified light beam based on a multi-optical-path pool and a gain medium; and the N-1-stage optical coupling unit is used for converting the light spot size of the light beam to be amplified amplified by the front-stage multi-optical-path amplification unit and coupling the light beam to be amplified to the rear-stage multi-optical-path amplification unit, and converting the light spot size of the pump light beam which is not absorbed by the rear-stage multi-optical-path amplification unit and coupling the light beam to the front-stage multi-optical-path amplification unit. According to the invention, a multi-stage amplification structure is adopted, pumping light beams are fully utilized, and high pulse energy and high pulse peak power can be realized; meanwhile, confocal of the multi-optical-path amplification unit is ensured based on the doping concentration and / or thickness of the gain medium sheet; the cross-section of the light beam at the location of the optical component is also increased such that the pulse peak power density and pulse energy density at the location of the optical component are maintained below a damage threshold, thereby protecting the optical component.

The invention discloses a light source device, a light source system and a water window wave band full-coherence free electron laser generation method. The device comprises a harmonic generation unit used for accessing an electron beam and seed laser and generating low-order harmonics; and the at least two stages of cascaded amplifier units are connected with the harmonic generation unit, and are used for accessing low-order harmonic radiation, generating coherent harmonic radiation and tuning the coherent harmonic laser into high-order harmonic radiation so as to obtain the water window wave band full-coherent free electron laser pulse. According to the invention, the multi-stage amplifier units are constructed at the rear stage of the harmonic generation unit, and each subsequent amplifier unit is configured to resonate on a higher harmonic output and radiated by the previous amplifier unit, so that the harmonic radiation of the previous stage is used as an effective seed of the next stage, and the step-by-step up-conversion of the frequency is realized; and converting the frequency of the coherent radiation to a target higher harmonic step by step to obtain the water window wave band full-coherent free electron laser.

The embodiment of the invention discloses a semiconductor device, a cascade amplifier and a forming method thereof. The semiconductor device includes a substrate having a first conductivity type, a well region formed within the substrate and having a second conductivity type opposite the first conductivity type, and a first transistor formed based on the well region. The first transistor includes a gate contact, a drain contact having a first conductivity type, a source contact having the first conductivity type, and a body contact having a second conductivity type. The semiconductor device also includes an isolation circuit formed over the substrate and coupled between the substrate and a ground voltage through a substrate contact.

The invention relates to the technical field of power electronic devices, in particular to a cascaded millimeter wave broadband low-noise amplifier which comprises a first common source amplifier, a second common source amplifier, a third common source amplifier and a fourth common source amplifier. Wherein the signal source internal resistor, the first T-type matching network, the first common source amplifier, the second T-type matching network, the second common source amplifier, the third T-type matching network, the third common source amplifier, the amplifying element, the fourth common source amplifier, the T-type output matching network and the load end impedance are connected in sequence; the first common-source amplifier, the second common-source amplifier, the third common-source amplifier and the fourth common-source amplifier are each provided with a source inductance negative feedback structure, so that a noise circle and a gain circle of the cascade amplifier can be pulled close at the same time, and synchronous optimization of noise performance and gain in a broadband range is achieved. Therefore, the defects that an existing LNA structure is poor in noise performance and low in gain are overcome, and a low noise coefficient can be kept while high gain is provided.

The embodiment of the invention provides a low-offset circuit structure with cascaded amplifiers, and the structure comprises an amplification link which comprises cascaded amplifiers, the first-stage amplifier is used for receiving a radio frequency input signal, and the last-stage amplifier is used for outputting a radio frequency output signal; the rectifier comprises a first input end and a second input end, the first input end and the second input end are respectively connected with the normal phase output end and the reverse phase output end of the amplifier, and the rectifier connected with the first target amplifier outputs a detection signal; the calibration circuit comprises a logic circuit, the logic circuit is connected with the output end of the rectifier and generates a target calibration signal based on the detected offset voltage and the initial calibration signal, and when the detected offset voltage reaches a preset value, the corresponding initial calibration signal is used for determining the target calibration signal; the calibration circuit also includes a current output unit for outputting a compensation current to the second target amplifier based on the target calibration signal. According to the embodiment of the invention, the offset voltage of the circuit structure can be reduced, and the stability and dynamic response performance of the circuit are improved.