42results about "Pulse generation by differential amplifiers" patented technology

The invention discloses a nanosecond high-voltage steep pulse generator, which relates to the technical field of high-voltage pulses and comprises a microcontroller, a Marx circuit, a trigger control module, an isolation high-voltage driving module, a safety module and a power management module, the microcontroller comprises a main chip, and parameters of the output end of the Marx circuit are collected in real time through the microcontroller. The trigger control module generates a nanosecond synchronous trigger signal; the isolation high-voltage driving module converts a low-voltage signal of the microcontroller into a high-voltage driving signal; the safety module is used for monitoring the state of the system, immediately cutting off a trigger signal when a fault occurs, and protecting the Marx circuit and the microcontroller; according to the invention, the microcontroller is used for generating synchronous trigger pulses and accurately triggering charging and discharging of the capacitor of the Marx circuit, and the high-speed ADC arranged inside can accurately control and detect voltage balance, trigger signals and fault protection.

The invention provides a differential signal generator and a calibration method thereof, and the differential signal generator comprises a control processing unit which is used for obtaining a common-mode bias voltage set value and a differential-mode bias voltage set value, determining a common-mode bias voltage code word according to a first mapping relation, determining a differential-mode bias voltage code word according to a second mapping relation, and setting the common-mode bias voltage set value and the differential-mode bias voltage set value; the common-mode bias voltage code word and the differential-mode bias voltage code word are output to the output amplification unit; the waveform generation unit is connected with the output amplification unit and is used for providing a positive-end alternating-current signal and a negative-end alternating-current signal for the output amplification unit under the control of the control processing unit; the output amplification unit is used for obtaining a positive-end bias intermediate voltage and a negative-end bias intermediate voltage according to the common-mode bias voltage code word and the differential-mode bias voltage code word so as to output a positive-end output signal and a negative-end output signal; the differential signal generator solves the problem that an existing differential signal generator cannot adjust common-mode bias output voltage and differential-mode bias output voltage.

The invention provides a pulse excitation microwave generation device for a quantum limit amplifier, and relates to the technical field of superconducting quantum calculation and other weak microwave signal measurement. The pulse excitation microwave generation device for the quantum limit amplifier comprises a microwave source used for generating continuous microwave signals; the microwave signal direct generation device is used for generating a pulse microwave signal; the frequency mixer is used for carrying out frequency mixing on the continuous microwave signal and the pulse microwave signal to generate a frequency mixing signal; the band-pass filter is used for filtering the frequency mixing signal; and the power amplifier is used for amplifying the filtered frequency mixing signal and generating pulse excitation microwaves for the quantum limit amplifier, so that the implementation cost is greatly reduced, the space occupied by equipment is reduced, and the space is saved.

The present invention belongs to the technical field of integrated circuits and relates to a stable on-chip clock generation circuit. The present invention includes a charge and discharge circuit, a comparator, and a timing logic circuit. Four switches are used in the charge and discharge circuit to jointly control the charging and discharging of the charging capacitor C1 to generate a linearly rising triangular wave signal. The compensation capacitor C2 in the charge and discharge circuit is used to offset the negative voltage mutation caused by the capacitor flip, effectively stabilizing the waveform and frequency of the triangular wave at the charging node VC. The comparator compares the charging triangular wave signal VC with the reference voltage source VREF, and the output signal is supplied to the timing logic circuit. The timing logic circuit is connected to the output of the comparator and is used to generate the first clock SW and the second clock SW_B, and the two are non-overlapping clock signals. By swapping the charging and discharging of the upper and lower plates of the capacitor C1 and combining with the compensation capacitor C2, the present invention can achieve rapid discharge of the charge on the capacitor, with a stable output clock frequency, a simple circuit structure, and low power consumption.

The invention provides a waveform agility high-power microwave generation system based on time reversal and a working method. The system comprises a computer, an arbitrary waveform generator, a first broadband power amplifier, m second broadband power amplifiers, a first time reversal pulse compression cavity, m second time reversal pulse compression cavities, a power divider, a high-speed sampling oscilloscope, m phase shifters, m directional couplers and m radiation antennas. The computer is connected with the arbitrary waveform generator, the high-speed sampling oscilloscope, the phase shifter and the directional coupler; the arbitrary waveform generator is connected with the high-speed sampling oscilloscope through the first time reversal pulse compression cavity on one hand, and is connected with an input port of the power divider through the first broadband power amplifier on the other hand. And m output ports of the power divider are sequentially connected with the radiating antenna through the corresponding second broadband power amplifier, the second time reversal pulse compression cavity, the phase shifter, the directional coupler and the radiating antenna. According to the invention, high-universality broadband internal waveform agility high-power microwave pulse generation can be realized.

An oscillator includes first and second comparators, a first impedance network having a first trim element therein, and a second impedance network having a second trim element therein. The first impedance network is electrically connected to a first input terminal of the first comparator, and the second impedance network is electrically connected to a first input terminal of the second comparator. The first and second impedance networks are configured to cause an improvement in common mode variation within the first and second comparators, in response to trimming of at least one of the first and second trim elements.

In described examples, a retimer includes a reference voltage generator, first, second, third, and fourth comparators, a hit sensor, a window results comparison circuit, and a window control circuit. First inputs of the first, second, third, and fourth comparators receive samples of a data stream. First, second, third, and fourth outputs of the reference voltage generator are coupled to respective second inputs of the first, second, third, and fourth comparators. The third and fourth comparators output to, respectively, first and second inputs of the hit sensor. The hit sensor outputs to an input of the window results comparison circuit. The window results comparison circuit outputs to an input of the window control circuit. The window control circuit outputs to an input of the reference voltage generator.

The invention provides a high-precision low-temperature-drift relaxation oscillation system with a symmetrical double-path architecture and a calibration method thereof. The system comprises a symmetric double-channel relaxation oscillator core framework, a fine adjustment circuit, a coarse adjustment circuit and a band-gap reference source module. The method comprises the following steps: S1, acquiring initial working parameters of a relaxation oscillator by a system, and determining an initial frequency value of the oscillator; s2, executing coarse adjustment calibration by a coarse adjustment circuit, and adjusting the frequency of the oscillator to be within a first preset range of a target frequency value; s3, the fine adjustment circuit executes fine adjustment calibration, and further adjusts the frequency of the oscillator to be within a second preset range of the target frequency value; s4, the band-gap reference source module executes temperature compensation calibration; s5, the system adjusts the proportion of the charging current and the discharging current, and duty ratio adjustment is executed; s6, the system executes frequency stability verification; and S7, generating a final calibration configuration and storing the final calibration configuration for long-term use of the oscillator. The invention is applied to the technical field of integrated circuits.

A fluctuation oscillator (1) is provided with: an adder (11) that has an input terminal (111) into which inputted is an input signal (S1) including a main signal and an uncorrelated signal which is uncorrelated to the main signal and has a higher frequency than the main signal, and that adds a feedback signal (S5) to the input signal (S1); a threshold value discrimination unit (12) for generating a pulse signal (S3) by comparing, against a threshold value, an addition signal (S2) obtained by addition by the adder (11); a transient response unit (13) for causing transient response of the generated pulse signal (S3) and generating an output signal (S4); and a feedback loop (16) for feeding back the output signal (S4) to the adder (11) as the feedback signal (S5).

The invention discloses a low-frequency kiloampere pulse current generator which is characterized by comprising a first working power supply, a second working power supply, a pulse generator and N isolation driver amplification units, wherein the first working power supply is respectively connected with one end of the pulse generator and a first power input end of each isolation driver amplification unit; the other end of the pulse generator is connected with the signal input end of each isolation driver amplification unit; the second working power supply is connected with the second power input end of each isolation driver amplification unit; n is a positive integer. Good test adaptability can be provided for pulse loads such as a TR assembly, and the defect that standard load equipment in the market cannot simulate the instantaneous pulse current is overcome.

The invention discloses a high-reliability pulse trigger circuit for radiation field measurement, and solves the problems that an existing pulse trigger circuit is easy to generate false trigger operation, cannot dynamically adjust and lock time parameters on the premise of not changing hardware configuration, and is weak in reliability and poor in flexibility. The circuit specifically comprises a comparison circuit, a self-locking circuit, a narrow pulse generation circuit and a switching circuit. The in-phase input end of the comparison circuit is used for being connected with external analog signal output equipment, the inverted input end of the comparison circuit is used for being connected with an external threshold voltage power supply Vth, and the output end of the comparison circuit is connected with the B input end of the self-locking circuit; the Q1 output end of the self-locking circuit is connected with the A input end of the self-locking circuit and is used for signal closed-loop feedback; the Y output end of the self-locking circuit is connected with the input end of the narrow pulse generation circuit; the narrow pulse generation circuit is used for generating a narrow pulse trigger signal according to the trigger pulse, and the output end is connected with the input end of the switching circuit; the switching circuit is used for outputting a fast pulse trigger signal.

Disclosed an oscillator circuit device includes: a resistor circuit comprising a first resistor disposed between a first supply voltage level and an output node; a resistor-capacitor circuit comprising a second resistor and at least one capacitor disposed between the output node and a second supply voltage level and connected in series, and a switch capable of discharging electric charges accumulated in the at least one capacitor; and a comparator configured to compare a voltage level to be compared obtained from the resistor circuit with a predetermined reference to allow the switch to be opened and closed according to a comparison result.

The invention discloses a pulse circuit, and relates to the technical field of electronics, the pulse circuit comprises a boost circuit, the boost circuit comprises a boost control circuit, a first diode and a first capacitor, the first end of the boost control circuit is connected with one end of the first capacitor, and the other end of the first capacitor is connected with the negative electrode of the first diode; the anode of the first diode is connected with a first power supply; a first end of the signal amplification circuit is connected with a negative electrode of the first diode and the other end of the first capacitor; the second end of the signal amplification circuit is connected with and controls the on-off of the pull-up switch, the first end of the pull-up switch is connected with a second power supply, the first end of the pull-down switch is grounded, and the second end of the pull-up switch is connected with the second end of the pull-down switch so as to cooperate to output pulse signals; and the main control chip is respectively connected with and controls the boost control circuit, the signal amplification circuit and the pull-down switch. The diode and the capacitor are used for boosting, and the production and manufacturing cost is low.

The present application relates to a phase synchronization circuit, a transceiver circuit, and a semiconductor integrated circuit. The phase synchronization circuit has an oscillation circuit (203) including a variable current generation section (222) that generates a variable current corresponding to a control voltage and a fixed current generation section (221) that generates a fixed current corresponding to a correction code, and generates an output clock signal of a frequency corresponding to a total current amount of the variable current and the fixed current, a feedback circuit (204) that generates a feedback clock signal based on the output clock signal, a control voltage generation circuit (202) that, in a normal operation mode, generates the control voltage based on the feedback clock signal and a reference clock signal so that the frequency of the output clock signal becomes a desired frequency, and a correction code generation circuit (201) that, in a correction mode, generates the correction code based on the feedback clock signal and the reference clock signal, and the control voltage generation circuit outputs a fixed control voltage in the correction mode.

The invention provides a pulse generation method and system, electronic equipment and a storage medium, and relates to the technical field of pulse generation, through a mode of combining a digital phase-locked loop and analog delay control, the pulse generation system realizes fine pulse width regulation and control while maintaining high frequency stability, and the pulse generation efficiency is improved. And the accuracy of digital logic and the flexibility of analog regulation and control are both considered. Moreover, a high-quality differential square wave signal is generated through an amplitude limiting amplifier, and then fine phase difference regulation and control are realized in combination with a time delay module, so that a target pulse signal with narrow pulse width, fast edge and accurate pulse width is generated. The digital phase-locked loop and the delay module are controlled by the controller, so that the pulse width can be flexibly adjusted, the pulse period can be controlled, and diversified requirements of different application scenes on pulse parameters can be met. The introduction of the feedback processing module can provide real-time monitoring and correction functions for the controller, and effectively counteracts the influence caused by environment change and drift of each component in the pulse generation system.

The invention aims to provide the module for controlling three wires by using two wires and the control method, an IO expansion chip is not needed, an additional third signal is generated from the existing clock signal, three control signals are obtained from two IO ports, and the purpose of saving cost is achieved. A clock signal is connected to the positive input end of a first voltage comparator through an input resistor, the negative input end of the first voltage comparator is connected with the negative input end of a second voltage comparator, the negative input end of the first voltage comparator is connected with a node of a first divider resistor and a node of a second divider resistor, and the output end of the first voltage comparator is divided into two paths, one path is connected to the positive input end of the second voltage comparator through a charging resistor, the other path is connected to the positive input end of the second voltage comparator through a discharging resistor and a discharging diode, the positive input end of the second voltage comparator is connected with the system ground through a capacitor, and the output end of the second voltage comparator serves as a port of a third signal. The method is applied to the technical field of IO expansion.

According to the duty ratio calibration circuit and the differential clock signal generation device provided by the invention, the duty ratio of an external clock signal can be calibrated to 50% through a collaborative architecture of the common-mode feedback circuit module and the driving circuit module and by adopting a full-analog circuit. A common-mode feedback circuit module collects common-mode levels of differential signals output by a driving circuit in real time, the common-mode levels are directly compared with reference voltage vref to generate a pair of differential control voltages, and then the driving circuit module dynamically corrects input external differential clock signals according to the two signals. The whole process does not need time-consuming links such as ADC analog-to-digital conversion and digital logic operation, the delay problem of a traditional scheme is thoroughly avoided, microsecond-level and even nanosecond-level real-time calibration is finally achieved, the core requirements for rapid initialization when a high-speed system is started and coping with sudden duty ratio deviation in operation can be accurately matched, and the real-time calibration accuracy of the high-speed system is improved. And the overall response efficiency of the system is greatly improved.

Embodiments of the present application relate to a hybrid driver with low output pad capacitance. The hybrid driver receives complementary high-speed input data signals and paired low-speed input data signals, selects a pair of input data signals from the paired input data signals, and drives output data signals on a first output node and a second output node based on the selected pair of input data signals. The hybrid driver includes a first driver circuit and a second driver circuit coupled to the first output node and the second output node, respectively. Each driver circuit includes a first series transistor and a second series transistor coupled between a first supply voltage node and a reference voltage node, wherein the interconnection of the first series transistor and the second series transistor is coupled to a corresponding first output node or a second output node. Each first driver circuit and the second driver circuit include a third transistor coupled in parallel with the corresponding first transistor. In response to the corresponding low-speed input data signal, each first transistor and the third transistor couples the corresponding output node in parallel to the second supply voltage node.

The utility model discloses a nanosecond pulse generator based on FPGA control and medical equipment. The nanosecond pulse generator comprises a power supply system, a DC-DC module, a pulse forming system, an FPGA control system and a man-machine interaction system, the power supply system comprises a filtering isolation module and a program-controlled direct-current power supply; the pulse forming system comprises an energy storage capacitor and an LTD high-voltage circuit module; the output end of the FPGA control system controls the pulse forming module to respectively control charging of the energy storage capacitor and discharging of the LTD high-voltage circuit module through a photoelectric isolation circuit, and the input end of the FPGA control system is in communication connection with the program control direct-current power supply and the man-machine interaction system. The nanosecond pulse generator designed by the utility model can output nanosecond high-voltage pulses, and does not generate too high voltage at an equipment end.

The utility model discloses a pulse circuit, which relates to the technical field of electronics, and comprises a boost circuit, the boost circuit comprises a boost control circuit, a first diode and a first capacitor, the first end of the boost control circuit is connected with one end of the first capacitor, and the other end of the first capacitor is connected with the cathode of the first diode; the anode of the first diode is connected with a first power supply; a first end of the signal amplification circuit is connected with a negative electrode of the first diode and the other end of the first capacitor; the second end of the signal amplification circuit is connected with and controls the on-off of the pull-up switch, the first end of the pull-up switch is connected with a second power supply, the first end of the pull-down switch is grounded, and the second end of the pull-up switch is connected with the second end of the pull-down switch so as to cooperate to output pulse signals; and the main control chip is respectively connected with and controls the boost control circuit, the signal amplification circuit and the pull-down switch. The diode and the capacitor are used for boosting, and the production and manufacturing cost is low.

This invention discloses a capacitive amplifier circuit and its signal generation method. The capacitive amplifier circuit includes a sampling circuit, a first-stage amplification unit, a second-stage amplification unit, a set of feedback capacitors, and a control unit. The control unit is used to control the on / off states between the first-stage amplification unit and the feedback capacitor, between the first-stage amplification unit and the second-stage amplification unit, and between the feedback capacitor and the second-stage amplification unit, respectively. According to the capacitive amplifier circuit and its signal generation method of this invention, by controlling the on / off states between the first-stage amplification unit, the feedback capacitor, and the second-stage amplification unit, as well as between the feedback capacitor and the second-stage amplification unit, the feedback capacitor can be pre-charged after the sampling circuit finishes sampling and before the capacitive amplifier circuit enters the amplification state. This reduces the operational amplifier switching time and lowers the bandwidth requirements for establishing a high-precision signal.

The present invention discloses a highly stable and adjustable triangular wave generator circuit. It includes a waveform comparison control loop, a waveform generation circuit, and a signal shaping and amplification loop; the waveform comparison control loop includes a comparator U3, the inverting input terminal of the comparator U3 is grounded, and the output terminal is connected to the base of the NPN transistor D2, the cathode of the Schottky diode D1, and one end of the resistor R1. The other end of the resistor R1 is connected to the collector of the transistor D2 and is connected to the positive power supply V+. The emitter of the transistor D2 and the anode of the Schottky diode D1 are connected in parallel to form a control output. The present invention has a brand-new idea for generating triangular carrier waves. Through reasonable design of the parameters of discrete devices, not only can the circuit change the frequency of the triangular wave, but also the amplitude can be adjusted. The most important thing is that the stability and reliability of its circuit system can be self-controlled, and the combined structure is simple and the debugging is very convenient.

In one aspect the present invention relates to an electronic circuit (100) comprising: - a chain (12) of buffers (40, 40', 40"), wherein each buffer (40) comprises a buffer input (45), a buffer output (46), a buffer current source (44) and a buffer capacitor (43) and wherein a transition time of each buffer (40, 40', 40") is controllable by the buffer current source (44, 44', 44"), - an oscillator (70, 71, 72) configured to generate an oscillating reference signal, and - a control circuit (80) coupled to the oscillator (70, 71, 72) and coupled to the buffer current sources (44, 44', 44") of the buffers (40, 40', 40") and operable to adjust the transition time of each buffer (40, 40', 40") on the basis of the oscillating reference signal.

An electronic circuit (100) including: a chain (12) of buffers (40, 40′, 40″), wherein each buffer (40) includes a buffer input (45), a buffer output (46), a buffer current source (44) and a buffer capacitor (43) and wherein a transition time of each buffer (40, 40′, 40″) is controllable by the buffer current source (44, 44′, 44″); an oscillator (70, 71, 72) configured to generate an oscillating reference signal; and a control circuit (80) coupled to the oscillator (70, 71, 72) and coupled to the buffer current sources (44, 44′, 44″) of the buffers (40, 40′, 40″) and operable to adjust the transition time of each buffer (40, 40′, 40″) on the basis of the oscillating reference signal.

To provide a signal receiving device that does not need to consider a jitter characteristic of a reception signal.SOLUTION: A signal receiving device according to the present invention includes a transition detection device that receives first to third input signals with different signal levels for each unit section, outputs a first comparison signal among a plurality of comparison signals by comparing whether or not the signal level of a first differential signal, which is a differential signal between the first input signal and the second input signal among the first to the third input signals, is higher than a first reference signal level, and outputs a second comparison signal among the plurality of comparison signals by comparing whether or not the signal level of the first differential signal is higher than a second reference signal level that is different from the first reference signal level; and a clock data restoration device that restores the clock signal embedded in the first to the third input signals on the basis of the first and the second comparison signals to generate a restoration clock signal.SELECTED DRAWING: Figure 1

The invention relates to the technical field of switching power supplies, and particularly discloses a voltage-controlled oscillation circuit and a switching power supply, the voltage-controlled oscillation circuit comprises an oscillation current generation module, a voltage control module and a charge-discharge proportional current control module, the oscillation current generation module is electrically connected with the voltage control module, and the voltage control module is electrically connected with the charge-discharge proportional current control module; the oscillation current generation module is used for generating corresponding oscillation current according to an external load of the voltage-controlled oscillation circuit; the voltage control module is used for performing voltage stabilization control according to the oscillating current to obtain a stable voltage control signal which does not fluctuate along with the external charging and discharging voltage; and the charge-discharge proportional current control module is used for determining a charge-discharge current proportion according to the stable voltage control signal and carrying out charge-discharge control on an external charge-discharge capacitor according to the charge-discharge current proportion. According to the voltage-controlled oscillation circuit provided by the invention, the precision and the stability of the switching power supply control chip can be improved under the condition that the production process is not changed.

An application specific integrated circuit (A SIC) can drive semiconductor devices, such as, radio frequency amplifiers, switches, etc. The A SIC can include a supply and reference voltage generation circuit, a digital core, a clock generator, a plurality of analog-to-digital converters, low and high-speed communications interfaces, drain and gate sensing circuits (that can include one or more current sense amplifiers), and a gate driver circuit. The ASIC can be a low voltage semiconductor integrated circuit.

The embodiment of the invention provides a clock generation system, a method for the clock generation system and a near field communication terminal. The clock generation system includes: an oscillation circuit configured to generate a clock signal; and a calibration circuit coupled to the oscillation circuit and configured to generate calibration information based on a clock signal to be calibrated of the oscillation circuit, the calibration information being used to adjust an output current of a current source of the oscillation circuit to a capacitor of the oscillation circuit, the oscillation circuit is further configured to vary a frequency of the clock signal to be calibrated based on the adjusted output current. According to the scheme, high-precision clock signals can be provided under the condition of low power consumption.

The application relates to the technical field of switching power supplies, and particularly discloses a voltage-controlled oscillation circuit and a switching power supply, which comprise an oscillation current generating module, a voltage control module and a charge-discharge proportional current control module; the oscillation current generating module is electrically connected with the voltage control module; the voltage control module is electrically connected with the charge-discharge proportional current control module; the oscillation current generating module is used for generating corresponding oscillation current according to the external load of the voltage-controlled oscillation circuit; the voltage control module is used for performing voltage stabilization control according to the oscillation current to obtain a stable voltage control signal which does not follow external charge-discharge voltage fluctuation; and the charge-discharge proportional current control module is used for determining a charge-discharge current proportion according to the stable voltage control signal, and performing charge-discharge control on the external charge-discharge capacitor according to the charge-discharge current proportion. The voltage-controlled oscillation circuit can improve the precision and stability of the switching power supply control chip without changing the production process.

The application provides a clock oscillation circuit and an integrated chip, which comprise a starting circuit, a feedback circuit, a signal conversion circuit and an oscillation unit. The oscillation unit receives a reference signal to generate a clock signal. The feedback circuit receives the clock signal to generate a feedback signal which is inversely proportional to the frequency of the clock signal. The signal conversion circuit converts the feedback signal into a first control voltage. When the clock oscillation circuit starts, the starting circuit generates the reference signal according to a set second control voltage. After the clock oscillation circuit starts for a first period of time, the starting circuit generates the reference signal according to the first control voltage. The application can generate a clock signal with high precision and high frequency.