33 results about "Pulse shaping circuits" patented technology

The invention provides a high-integration-level signal reading module for a neutron proportional counter tube, and belongs to the technical field of neutron detection, the high-integration-level signal reading module comprises stacked double-layer circuit boards, and the upper circuit board and the lower circuit board are connected through pin interfaces; the upper circuit board is provided with a signal processing circuit which is used for reading, amplifying, discriminating and shaping signals of the neutron proportional counter tube. The lower-layer circuit board is provided with a positive and negative dual-power-supply support circuit which provides + / -3.3 V power supply support for the signal processing circuit of the upper-layer circuit board. The module supplies power through the lower-layer power panel, and the lower-layer circuit board supplies positive and negative power to the upper-layer circuit board after completing power conversion. Signals are input through the IPX interface of the upper-layer circuit board and are output through the other IPX interface after being processed. The charge sensitive pre-amplifier, the broadband voltage amplifier, the pulse discriminator circuit, the pulse shaping circuit and the power management module are integrated in the same module, so that the real integrated design is realized.

The invention discloses a continuous pulse shaping circuit based on a multi-module pulse transformer and a control method, and belongs to the technical field of pulse power. Which comprises a plurality of groups of single-module transformer units which are connected in series, and a primary charging power supply is connected in parallel with the two ends of all the single-module transformer units, and is characterized in that a bridge circuit is arranged in each group of single-module transformer unit and is connected with a primary winding of a pulse transformer; the secondary windings of the pulse transformers in all the single-module transformer units are respectively connected with a load in parallel; the bridge circuit comprises two branches which are connected in a staggered mode, the energy storage capacitor is connected between the two branches, and the two branches share the energy storage capacitor and are reversely turned off in a time-sharing mode under driving of voltages at the two ends of the energy storage capacitor. According to the continuous pulse shaping circuit based on the multi-module pulse transformer and the control method, the bridge circuit is reliably turned off through the energy storage capacitor, so that the continuous pulse shaping circuit has relatively high through-current capability and relatively low cost; and the energy storage capacitor reversely turns off the main switch thyristor, so that the utilization efficiency of energy is improved.

The utility model particularly relates to an SIPM dose rate detector based on an amplifying circuit. The SIPM dose rate detector comprises a scintillator and SIPM coupling module, a pulse shaping circuit and a data receiving and displaying module. A signal amplification circuit and a voltage comparison circuit are arranged between the pulse shaping circuit and the data receiving and displaying module; the scintillator and SIPM coupling module is used for receiving input radiation energy; the pulse shaping circuit is in signal transmission connection with the output end of the scintillator and SIPM coupling module and is used for receiving signals output by the scintillator and SIPM coupling module; the signal amplification circuit is in signal transmission connection with the output end of the pulse shaping circuit and is used for receiving a signal output by the pulse shaping circuit; the voltage comparison circuit is in signal transmission connection with the output end of the signal amplification circuit and is used for receiving a signal output by the signal amplification circuit; the output end of the voltage comparison circuit is in signal transmission connection with the data receiving and displaying module. The structural design of the SIPM dose rate detector is helpful for improving the sensitivity of the SIPM dose rate detector.

The invention provides a multi-input pulse shaping circuit based on current addition and electronic equipment, and relates to the field of integrated circuits. The input end of each path of detection unit in the multiple paths of detection units is connected with one pixel, and the output end of each path of detection unit is connected with the input end of one path of trigger signal unit. According to the comparator circuit, the amplitude of the signal transmitted to the input end of the comparator through the summing circuit is far higher than that of the signal transmitted to the input end of the comparator through a traditional circuit structure, the threshold voltage range can be set to be high, and the comparator circuit meeting the requirement can be designed with a small area. A good measurement dynamic range can be achieved under the condition that the area of a chip is saved, and meanwhile the risk of false triggering is avoided. And tiny disturbance generated by a single pixel under the condition of no input signal cannot be detected, so that the working reliability of a chip is improved. The multi-input pulse shaping circuit structure based on current addition can enable a front-end circuit to reach an excellent dynamic range under the condition of saving the area of a comparator.

The present invention relates to an ultra-fast 10ps differential Gaussian pulse generator with adjustable amplitude. The generator comprises a pulse shaping circuit, a high-voltage conversion circuit, a low-voltage conversion circuit, a high-voltage regulation circuit, an avalanche circuit, a first low-voltage regulation circuit, a first step circuit, a second low-voltage regulation circuit, a second step circuit, a differential circuit, a bandpass filter, and an impedance converter. The ultra-fast picosecond differential Gaussian pulse generator disclosed herein utilizes avalanche technology, with the adjustment circuit added to the avalanche circuit to achieve adjustable pulse amplitude.

A superconducting controller for superconducting quantum bits is used for implementing a high-fidelity quantum gate through magnetic flux driving. The controller comprises an inductor which forms an inductance loop and is used for being coupled with a low-mutual-inductance quantum bit inductor; and a pulse shaping circuit for applying a current pulse having a predetermined shape to the inductor. The pulse shaping circuit includes: a superconducting circuit for outputting a single flux quantum (SFQ) pulse; and a digital counting circuit for generating the shape of the current (flux) pulse by controlling the number of SFQ pulses applied to the inductive loop by incrementing or decrementing the current of the inductor by one SFQ pulse at a time.

The invention belongs to the field of wireless communication, relates to a pulse shaping technology in an IR-UWB wireless transmitter, and particularly provides a UWB pulse shaping circuit based on a frequency divider, which comprises a TSPC frequency divider, combinational logic, an adjustable delay unit and an SCPA adder, wherein the TSPC frequency divider converts a rectangular pulse of a base band into four paths of pulse signals phi 1 to phi 4, the duty ratios of the four paths of pulse signals phi 1 to phi 4 are sequentially increased, the pulse signals phi 1 to phi 4 are combined through combinational logic to form pulse signals S1 and S3, the pulse signals S1 and S3 correspondingly obtain pulse signals S2 and S4 after respectively passing through the adjustable delay unit, the pulse signals S1, S2, S3 and S4 are synthesized through the SCPA adder, and a shaped pulse waveform is output. Based on a traditional frequency divider architecture, the frequency divider is combined with the adjustable delay unit to realize adjustment of multiple dimensions such as pulse shape, pulse width, amplitude and the like, and the frequency divider is simpler in circuit implementation, higher in degree of freedom, simpler to control, better in circuit robustness and capable of being applied to more application scenes.

Disclosed herein is a radiological instrument (100, 200, 300, 400, 600, 700, 800) comprising at least one pulse shaper circuit (102) configured for a direct conversion radiation detector (108). The at least one pulse shaper circuit comprises an amplifier (110). The pulse shaper further comprises: a feedback circuit (118) in parallel with the amplifier; a first switch unit (120) in series with the feedback circuit; a second switch unit (122) in parallel with the amplifier; a discrimination circuit (124) providing a discrimination signal (128) when the output exceeds a controllable signal threshold; and a control unit (124) for controlling the first switch unit and the second switch unit, wherein the control unit controls the second switch unit such that when the second switch unit is closed, a majority of the signal is integrated.

A superconducting controller for a superconducting qubit to execute high fidelity quantum gates using magnetic flux drive. The controller comprises: an inductance forming an inductive loop and configured to be inductively coupled to a qubit with a small mutual inductance; a pulse shaping circuit configured to apply a current pulse with a predefined shape across the inductance. The pulse shaping circuit comprises: a superconducting circuit configured to output single flux quanta (SFQ) pulses and a digital counter circuit configured to produce the shape of the current (magnetic flux) pulse by controlling the number of SFQ pulses applied to the inductive loop by incrementing or decrementing the current across the inductance by one SFQ pulse at a time.

The invention discloses a neutron counter with accumulated pulse amplitude calibration. The neutron counter comprises a charge sensitive preamplifier, a pulse processing circuit and a master control counting circuit, an electric signal output by the detector is converted into a negative exponential pulse signal through the charge sensitive preamplifier, the negative exponential pulse signal is output to the pulse processing circuit and then counted through the main control counting circuit, and a count value is obtained. The pulse shaping circuit is additionally arranged, accumulated pulse signals are decomposed, the overall pulse passing rate is improved, the amplitude of the accumulated pulses is reduced through the subtracter, and miscounting caused by amplitude superposition is greatly reduced. The neutron counter is modulated by introducing the accumulation pulse amplitude calibration technology, pulse accumulation caused by a large number of neutron events in the monitoring process of the BNCT beam field is reduced, and the influence of reduction of the pulse passing rate and pulse miscounting on the final counting value is avoided. The performance of the neutron counter can be improved to a certain extent, so that the accuracy and reliability of BNCT beam monitoring are improved.

A superconducting controller for a superconducting qubit to execute high fidelity quantum gates using magnetic flux drive. The controller comprises: an inductance forming an inductive loop and configured to be inductively coupled to a qubit with a small mutual inductance; a pulse shaping circuit configured to apply a current pulse with a predefined shape across the inductance. The pulse shaping circuit comprises: a superconducting circuit configured to output single flux quanta (SFQ) pulses and a digital counter circuit configured to produce the shape of the current (magnetic flux) pulse by controlling the number of SFQ pulses applied to the inductive loop by incrementing or decrementing the current across the inductance by one SFQ pulse at a time.

The present invention provides a pulse shaping circuit for wireless communication and a calibration method thereof, the circuit comprising a plurality of pulse formers, each of the plurality of pulse formers comprising at least one rising delay unit and at least one falling delay unit, the specific delay time of the at least one rising delay unit and the specific delay time of the at least one falling delay unit can be independently controlled, and an input signal forms a required wireless pulse shape as an output signal after being subjected to aliasing through output signals of the multiple pulse forming devices. The at least one rising delay unit and the at least one falling delay unit are respectively provided with a built-in delay unit. According to the pulse shaping circuit for wireless communication and the calibration method thereof provided by the invention, the required pulse shape is formed through delay superposition.

The utility model discloses a valve opening control circuit which comprises a power supply circuit, and a reflection switch circuit, a pulse shaping circuit, an MCU (Microprogrammed Control Unit) main control circuit, an in-place sensor, a motor driving circuit and a direct-current brush motor which are all connected with the power supply circuit, a rear shaft of the direct-current brush motor is provided with a disc with a reflective area and a non-reflective area, and the upper portion of the end face of a reflective switch in the reflective switch circuit is close to the edge of the disc. During working, through acquisition control of the in-place sensor and the MCU, the total number of motor operation pulses from full opening to full closing or from full closing to full opening of the valve is firstly acquired, and then the number of motor operation pulses required by an opening gear is calculated according to the total opening gear requirement of the valve; accurate control of each opening degree is achieved by collecting the number of rotation turns of the motor and controlling the motor through the MCU.

A superconducting controller for a superconducting qubit to execute high fidelity quantum gates using magnetic flux drive. The controller comprises: an inductance forming an inductive loop and configured to be inductively coupled to a qubit with a small mutual inductance; a pulse shaping circuit configured to apply a current pulse with a predefined shape across the inductance. The pulse shaping circuit comprises: a superconducting circuit configured to output single flux quanta (SFQ) pulses and a digital counter circuit configured to produce the shape of the current (magnetic flux) pulse by controlling the number of SFQ pulses applied to the inductive loop by incrementing or decrementing the current across the inductance by one SFQ pulse at a time.

A multi-cycle path circuit includes a logic circuit, a memory, and an on-chip clock controller. The multi-cycle path circuit is configured to operate in a functional mode in which the logic circuit controls reading and / or writing of the memory, and in a full-speed test mode in which the logic circuit controls reading and / or writing of the memory. The invention uses a clock pulse shaping circuit to control a functional mode clock gating element and a clock divider to establish a multi-cycle phase relationship between a clock into the logic and a secondary cache DRAM memory timing path. It also ensures that the clock path into and out of the secondary cache DRAM is the same in the functional mode and the full-speed test mode to avoid hold and set timing conflicts between these modes.

The utility model relates to an optical path detection alarm circuit for a fiber laser. The optical path detection alarm circuit comprises a photoelectric detection circuit, a pulse shaping circuit, a first synthesis circuit and a second synthesis circuit, the photoelectric detection circuit receives and amplifies an optical signal output by the laser; the pulse shaping circuit receives a laser enable signal consistent with the optical signal in frequency, and outputs a shaping signal of a TTL level under the triggering of the laser enable signal; the first synthesis circuit performs NAND logic operation on the laser enable signal and the shaping signal and outputs a first synthesis signal; and the second synthesis circuit is used for carrying out OR logic operation on the first synthesis signal and the optical signal and outputting a constant TTL level detection signal. According to the utility model, when the laser outputs quasi-continuous laser or continuous laser, a path of constant TTL level detection signal can be generated, the applicability is strong, the occupied resources are few, the circuit can detect optical signals with any frequency and any duty ratio, and a guarantee is provided for the use safety of the laser.

The invention relates to the technical field of steep-edge pulse forming of pulse forming circuits, in particular to a steep-edge pulse energy forming method based on a pulse forming circuit, which comprises the following steps: charging an energy storage capacitor bank in a preset charging period, and performing initial gating on a forming network formed by PFN sections and Blumlein transmission line sections and an impedance gradient matching network; when the charging voltage reaches a target value, a shaping switch is triggered to output a test pulse, an incident component and a reflection component are obtained through an output sampling branch, and a reflection characteristic quantity is generated; the reflection characteristic quantity executes gating updating on matching network segment impedance configuration and forming network segment combination according to a minimum reflection criterion, and a retest pulse is triggered to obtain a retest reflection characteristic quantity; and when the remeasured reflection characteristic quantity is smaller than or equal to the reflection judgment threshold value, triggering working pulse output, and obtaining a steep edge pulse energy forming result at the load end. According to the invention, impedance matching consistency and waveform stability are improved through reflection quantity closed-loop gating.

The application provides a background signal processing circuit and method for a quadrupole mass spectrometer, which comprises a pre-signal processing circuit and a data acquisition circuit, the pre-signal processing circuit comprises an amplification circuit, a fast discrimination circuit, a pulse shaping circuit and a differential output circuit connected in series, the amplification circuit is connected with an electron multiplier, and weak current pulse signals output by the electron multiplier are input to the amplification circuit; the data acquisition circuit comprises an FPGA core circuit and a pulse receiving circuit, a network port communication circuit, a quadrupole power voltage control circuit and an SPI interface circuit connected with the FPGA core circuit respectively, the differential output circuit is connected with the pulse receiving circuit, and the SPI interface circuit is connected with the fast discrimination circuit. By improving the hardware circuit structure, the application can automatically filter various noise signals in front of pulse counting, ensure the accuracy of pulse counting, and solve many problems caused by background signal interference in mass spectrum.

A spatial high-reliability single-photon avalanche diode timing control circuit, wherein a current-sense resistor converts an avalanche current signal into a detectable voltage signal, which is then converted into a level signal by a single-photon signal readout circuit, and a single-photon pulse shaping circuit shapes the level signal; a high-side and low-side quenching timing circuit uses the level signal output by the single-photon signal readout circuit as a trigger signal to generate high-side and low-side quenching control signals; a low-side reset timing circuit uses the QCHN signal output by the high-side and low-side quenching timing circuit as a trigger signal to output a low-side reset control signal and a high-side reset timing circuit trigger signal SRN to generate a high-side reset control signal; and a global reset circuit shapes an externally input enable signal to generate a global reset signal RST, which puts the SPAD in a ready state for generating single-photon signals. The present invention can ensure that the SPAD timing is not disordered and improve the working reliability of the SPAD, and is mainly used in spatial high-reliability single-photon avalanche diode timing control occasions.

A pulsed power generator includes a first plurality of capacitive stages coupled together. Each capacitive stage of the first plurality of capacitive stages includes a plurality of capacitors, one or more switches for erecting the plurality of capacitors, and a conductive band forming a loop around the plurality of capacitors. The conductive band is to carry a current between the plurality of capacitors and to couple adjacent capacitive stages of the first plurality of capacitive stages. The pulsed power generator includes a pulse shaping circuit at an output of the first plurality of capacitive stages.

The utility model discloses a raised cosine pulse forming circuit which comprises a pulse shaping circuit, the output end of the pulse shaping circuit is respectively connected with a rising edge oscillating circuit and a falling edge discharging circuit, and the output end of the rising edge oscillating circuit and the output end of the falling edge discharging circuit are jointly connected with a high-voltage large-current driving circuit. And the rising edge oscillating circuit is connected with the falling edge discharging circuit. According to the raised cosine pulse forming circuit disclosed by the utility model, the problem of deformation of pulse waveform output in the prior art is solved.

A pulse shaping circuit (1) for shaping detector pulses in a spectrometer comprises a circuit input for receiving detector pulses from an analog ion detector, a flip-flop (10) for receiving detector pulses from the circuit input, a delay unit (20) for receiving an output pulse from the flip-flop and feeding a delayed output pulse to a reset input of the flip-flop, and a circuit output for providing the output pulse or the delayed output pulse to a counter. A minimum duration of a duration of the output pulse and a spacing between the output pulses is determined by the delay unit (20). The pulse shaping circuit (1) can comprise at least one Schmitt trigger (40).

The invention discloses an underwater wireless optical communication system based on a pulse position modulation technology, and a transmitting module of the underwater wireless optical communication system comprises a transmitting end FPGA used for modulating target data into digital pulse signals; the driving modulation circuit is used for converting the digital pulse signal into a modulation current signal for controlling a light source; the light source module is used for generating a light signal based on the modulation current signal; the receiving module comprises an optical module used for performing power attenuation and stray light filtering on an optical signal; the photoelectric detector is used for performing photoelectric conversion and amplification on the optical signal to obtain an analog electric signal; the analog-to-digital conversion and pulse shaping circuit is used for performing analog-to-digital conversion and pulse shaping on the analog electric signal to obtain a digital signal; and the receiving end FPGA is used for performing bit synchronization, frame synchronization and demodulation on the digital signal to obtain demodulation data. By adopting the pulse position modulation technology, the FPGA design and the compact modular structure, the purposes of low power consumption, miniaturization and real-time information transmission are achieved.

The invention discloses a high-amplitude picosecond pulse source based on a metal oxide semiconductor field effect transistor and a step recovery diode. The high-amplitude picosecond pulse source is used for driving an ultrafast semiconductor laser. The circuit is composed of a power supply circuit, a pulse generation circuit based on an MOSFET, and a pulse shaping circuit based on an SRD and a short-circuit transmission line. The power supply circuit converts an external input constant voltage into different voltages suitable for each device, and also provides a bias current for the SRD in the shaping circuit, thereby guaranteeing the normal work of each part. The pulse generation circuit adopts an MOSFET driving chip to accelerate and amplify a trigger signal so as to drive a high-voltage-resistant and small-parasitic MOSFET and generate a high-amplitude and fast-leading-edge subnanosecond pulse. The pulse shaping circuit adopts a short-circuit transmission line structure composed of a parallel SRD and a Schottky diode, a preceding-stage pulse is sharpened, and a picosecond Gaussian pulse with the amplitude up to 10V is generated. The design serves as an electric pulse generator, has ultra-short pulse width and high amplitude, and can be applied to semiconductor lasers of various wave bands.

The utility model provides a motor array control system used for a transmission band, comprising a mainboard, a CPU board, an IO board, four motor driving boards, an AC380V external power supply and a voltage reduction module, the CPU board, the IO board and the four motor driving boards are all connected with the mainboard, the mainboard is provided with a voltage detection module, a current detection module, a temperature detection circuit, a phase detection circuit, a pulse shaping circuit, a 595 serial-to-parallel circuit, a filter circuit, a zero cross detection circuit, an indication circuit, a 595 serial-to-parallel circuit and a fan driving circuit, and the motor driving board is provided with a voltage driving circuit, a temperature test circuit and an alarm circuit. The IO board is provided with eight digital quantity input interfaces, 4-20 analog quantity input acquisition interfaces, eight dry node digital quantity output interfaces and eight photoelectric coupling transistor digital quantity output interfaces. According to the utility model, a modular design is adopted, the number of cables can be reduced, wiring time is reduced, cost is saved, and expansibility is strong.

The present application relates to the technical field of steep pulse shaping of pulse forming circuit, and particularly relates to a steep pulse energy shaping method based on a pulse forming circuit, which comprises: charging an energy storage capacitor group in a preset charging period, and initially gating a shaping network composed of PFN segments and Blumlein transmission line segments and an impedance gradient matching network; triggering a shaping switch to output a test pulse when a charging voltage reaches a target value, obtaining an incident component and a reflected component through an output sampling branch and generating a reflected characteristic quantity; the reflected characteristic quantity performs gating update on the matching network segment impedance configuration and the shaping network segment combination according to the minimum reflection criterion, and triggers a retest test pulse to obtain a retest reflected characteristic quantity; triggering a working pulse output when the retest reflected characteristic quantity is less than or equal to a reflected judgment threshold, and obtaining a steep pulse energy shaping result at a load end. The present application improves impedance matching consistency and waveform stability through reflected quantity closed-loop gating.

Fast-charge shaping circuits and methods for shaping the output of a fast-charge one-shot circuit so as to more precisely shape a fast-charge pulse to a bypass switch placed in parallel with an LNA bias resistor in order to decrease the response time of the LNA to circuit mode changes while minimizing perturbations. Accordingly, the settling time of the LNA during mode changes is less dependent on bias resistance, thereby enabling a Noise Figure improvement. A first approach staggers the release of a fast-charge pulse or pulses over multiple resistor segments to gradually increase the effective resistance of bias resistors. A second approach applies a diode and RC filter to a fast-charge pulse to shape the pulse to gradually increase the effective resistance of bias resistors. A third approach uses an op-amp and timing circuit to control the fast-charge pulse shape to gradually increase the effective resistance of bias resistors.

The disclosure provides a control circuit and system of a solid-state switch of an excimer laser high-voltage pulse power supply, comprising: a pulse isolation circuit, which is used for converting an external input TTL pulse trigger signal into a steep pulse edge and isolating a front-stage pulse generation circuit of a high-voltage pulse power supply from a solid-state switch; and a pulse shaping circuit, which is used for receiving the steep pulse edge input and performing pulse shaping to generate a TTL pulse signal with a required frequency and pulse width. The control circuit and system of the solid-state switch of the excimer laser high-voltage pulse power supply can realize stable and reliable operation of the solid-state switch.

Fast-charge shaping circuits and methods for shaping the output (V2) of a fast-charge one-shot circuit so as to more precisely shape a fast-charge pulse to a bypass switch placed in parallel with an LNA bias resistor in order to decrease the response time of the LNA to circuit mode changes while minimizing perturbations. Accordingly, the settling time of the LNA during mode changes is less dependent on bias resistance, thereby enabling a Noise Figure improvement. A first approach staggers the release of a fast-charge pulse or pulses over multiple resistor segments (R1-R5) to gradually increase the effective resistance of bias resistors. A second approach applies a diode (DI) and RC filter (Cf, Rf) to a fast-charge pulse (706) to shape the pulse to gradually increase the effective resistance of bias resistors (Rl). A third approach uses an op-amp (906) and timing circuit (Ml, R2, R3, C) to control the fast-charge pulse shape (704) to gradually increase the effective resistance of bias resistors.

The invention relates to a narrow pulse laser driving system, which relates to the technical field of laser driving, and comprises a main control circuit module, a signal generation and pulse shaping circuit module and a driving circuit module, wherein the main control circuit module obtains a control instruction and then sends the control instruction to the signal generation and pulse shaping circuit module; the signal generation and pulse shaping circuit module responds to the control instruction, generates a trigger signal and sends the trigger signal to the driving circuit module; the driving circuit module drives the laser diode to work according to the trigger signal; and in the driving circuit module, a shaping buffer circuit shapes and buffers the trigger signal to obtain a driving signal, and the wide bandgap semiconductor power switch tube switches the on-off state of the wide bandgap semiconductor power switch tube according to the on-off of the driving signal so as to control the on-off of the working current flowing through the laser diode. According to the invention, ultra-narrow laser pulses with high peak power and high repetition frequency can be stably generated, and low heat consumption can be realized.