70results about "Sinusoidal oscillations train generator" patented technology

The invention relates to a high-precision calibration method and system for a digital sinusoidal signal generator. According to the method, an ideal sine array is generated through a script program to serve as DAC input; the Raspberry Pi 4B and the DA-AD board form a sinusoidal signal error extraction module, a DA-AD conversion process is executed, and an actual output array is obtained at an ADC output position and used for extracting errors; calculating to obtain a DAC error curve according to the actual output array and the ideal input array, and performing polynomial type fitting and trigonometric function type fitting on the error curve by adopting a least square method and a particle swarm algorithm respectively; and compensating an error fitting result to DAC input, running DA-AD conversion again to obtain an output array, and calculating a compensated DAC output error to represent the precision of the sinusoidal signal. According to the method, the error curve in the sine function form can be accurately fitted, the consumed time is short, and the error fitting in the sine function form better conforms to the theoretical error rule when the DAC is used for generating the sine signal.

Disclosed are a method and an apparatus for generating a qubit control signal, wherein a main pulse and a DRAG pulse used to control a superconducting quantum computer are generated with low power and without a memory. The method comprises the steps of: generating a first sine curve having a first phase obtained by multiplying an angular velocity by a predetermined time of each period, the angular velocity being obtained by adding a first angular velocity of a center frequency and a second angular velocity at a predetermined time of each period; and generating a second sine curve having a second phase obtained by multiplying an angular velocity by a predetermined time, the angular velocity being obtained by subtracting the second angular velocity from the first angular velocity. The DRAG pulse is generated through an operation of adding the first sine curve and the second sine curve.

A high-voltage transmitting circuit (100) for a catheter, and an ablation tool (1000). A first electrode (P1) and a second electrode (P2) are provided on the catheter. The high-voltage transmitting circuit (100) comprises: a first transmitting circuit (110), wherein a first end of the first transmitting circuit (110) is connected to a high-voltage positive electrode (+HV), a second end of the first transmitting circuit (110) is connected to a high-voltage ground (GND), and a third end of the first transmitting circuit (110) is connected to a high-voltage negative electrode (−HV); a filtering circuit (120), wherein an input terminal of the filtering circuit (120) is connected to a transmitting terminal of the first transmitting circuit (110), an output terminal of the filtering circuit (120) is connected to the first electrode (P1), and the second electrode (P2) is connected to the high-voltage ground (GND); and a control circuit (130), wherein the control circuit (130) is used for controlling the first transmitting circuit (110) to output an alternating-current (AC) square wave, which is subjected to filter processing by the filtering circuit (120) to form a sine wave between the first electrode (P1) and the second electrode (P2). In this way, the output of pulsed voltage waveform of the sine wave is realized, and therapeutic requirements in some ablation operations by pulsed electric field are satisfied, thereby expanding the application prospects of ablation technique by pulsed electric field in arrhythmia treatment.

The radio frequency (RF) generator includes a pulse generation circuit configured to obtain an input signal indicative of a pulse pattern that defines an envelope of a pulsed RF signal. The pulse generation circuit stores data values ​​that define power levels and durations of segments of the pulse pattern. The pulse generator generates pulse modulation control signals in response to the stored data values, the pulse modulation control signals indicative of the power levels and durations of each segment of the pulse pattern, and the pulse modulation control signals are provided to a control circuit to generate control signals to adjust the amplitude and duration or width of the RF signal to generate a pulsed RF signal having the pulse pattern.

The utility model discloses an auxiliary power supply EMC universal jittering frequency circuit, comprising a frequency selection module used for determining the frequency of an output sine wave; the in-phase amplification module is electrically connected to the frequency selection module and is used for starting oscillation of the circuit; the normal-phase gain network is electrically connected with the in-phase amplification module and used for being matched with the in-phase amplification module to adjust and self-stabilize the signals; the third capacitor C3 is electrically connected to the output side of the in-phase amplification module and used for removing the direct-current component and leaving an alternating-current component; one end of the output voltage-dividing module is electrically connected to the capacitor C3, the other end of the output voltage-dividing module is grounded, and a voltage-dividing wiring end is used for being connected with the analog control IC and the oscillator at the same time. According to the invention, the EMC radiation interference of the auxiliary power supply of a power supply product of a company can be optimized with relatively low cost.

The invention relates to an electrical stimulation device, an electrical stimulation signal generation method and a readable storage medium. The electrical stimulation device comprises: a control unit for outputting a control signal; the signal generation unit is used for generating a first signal and a second signal according to the control signal; the output unit is used for outputting a first signal and a second signal, the difference value of the first signal and the second signal is smaller than a threshold value, the first signal acts on a first time period of the stimulation period, and the second signal acts on a second time period of the stimulation period. By adopting the method, the problem of user pricking caused by unreasonable waveform design in the stimulation period can be solved.

A sine wave generation circuit includes: a first direct digital synthesizer generating a digital sine wave fundamental signal having a frequency f0 in a normal operation mode and a calibration mode; a second direct digital synthesizer generating a digital second harmonic correction signal having a frequency 2f0 in the normal operation mode; a correction circuit superimposing the digital second harmonic correction signal on the digital sine wave fundamental signal; a D / A converter converting an output of the correction circuit into an analog sine wave signal; an output buffer receiving the analog sine wave signal and outputting an analog sine wave output signal; an A / D converter converting the analog sine wave output signal into a digital signal in the calibration mode; and a processing circuit generating a spectrum based on the digital signal in the calibration mode and setting a parameter of the second direct digital synthesizer based on the spectrum.

This invention provides systems, apparatus, methods, and computer programs for RF pulses within pulses for semiconductor radio frequency (RF) plasma processing. [Solution] A method for generating a high-frequency (RF) waveform includes the step of defining an ON-OFF pulse train separated by an OFF state that does not have an ON-OFF pulse. The method further includes the step of generating an RF waveform by applying a multilevel pulse waveform that adjusts the magnitude of each ON-OFF pulse. The method includes the step of sending the RF waveform to an electrode.

The present invention provides a filtering and compensating device for a test transformer, which includes a harmonic detection unit, an instruction current operation unit, a trigger pulse generation unit, and a compensating current generation unit that are electrically connected in sequence; the harmonic detection unit is used to collect the voltage and current signals output by the induction voltage regulator; the instruction current operation unit is used to generate an instruction signal, the trigger pulse generation unit is used to send a pulse drive to the compensating current generation unit; the compensating current generation unit is used to generate a compensating current; the present invention can realize the automatic tracking compensation of the voltage waveform of the induction voltage regulator of the test transformer, effectively limit the high-order harmonics, and make the voltage waveform output by the induction voltage regulator as close to a sine wave as possible. The active filtering and compensation method can also compensate for the capacitive or inductive reactive power during the withstand voltage test, solve the under-compensation or over-compensation phenomenon that occurs when a capacitor or inductor with a fixed capacity is connected in parallel, and improve the capacity utilization rate of the test transformer.

The invention belongs to the technical field of micro-nano plasma switches and radio frequency and power circuits, and particularly relates to a frequency-adjustable high-power pulse signal generation circuit based on a micro-nano plasma switch, which comprises a sinusoidal signal generation module, a tuning module and a micro-nano plasma switch module, the sinusoidal signal generation module comprises an NMOS cross coupling pair, a PMOS cross coupling pair and an LC resonant cavity. The tuning module comprises a capacitor array and a frequency tuning module. A micro-nano plasma switch is used for realizing large-current transmission and is matched with a sine wave signal to generate a specific pulse signal. An inductor and a variable capacitor are introduced into the LC resonant cavity and the frequency tuning unit, and the capacitance value is adjusted by changing the end voltage of the capacitor, so that the circuit outputs a pulse signal of which the frequency covers a low frequency band to a terahertz frequency band under the control of different voltages. The pulse signal generated by the circuit has the characteristics of high power, picosecond-level rising edge and different repetition frequencies, and is suitable for terahertz communication, radar and other systems.

A system and method for generating a radio frequency (RF) waveform are described. The method includes defining a train of on-off pulses separated by an off state having no on-off pulses. The method further includes applying a multi-level pulse waveform that adjusts a magnitude of each of the on-off pulses to generate an RF waveform. The method includes sending the RF waveform to an electrode.

The invention relates to the technical field of numerical control machining, and discloses a sine wave modulation system for numerical control machining control. According to the sine wave modulation system for numerical control machining control, current and voltage data of the input end and the output end of a numerical control equipment power supply are collected, PMW signal high-level data of the numerical control equipment are collected, and the power supply system efficiency and the PMW signal duty ratio of the numerical control machining equipment are calculated according to the data; after a compensated sine wave value is generated, the compensated sine wave value is sent to a numerical control equipment control unit, PMW signal high level data is collected, real-time calculation and analysis are carried out according to the collected data, and the compensated sine wave value is updated in real time along with real-time changes of voltage and current of a power input end and a power output end of numerical control equipment. The voltage and current required by the motor of the numerical control equipment are adjusted in real time, obvious difference between an output signal and an ideal sine wave is reduced, the influence on the machining precision is reduced, and the machining precision is improved.

The invention relates to a driving circuit, electronic equipment and a control method. The driving circuit comprises a control circuit, an oscillating circuit and an energy storage circuit. The control circuit is connected with the energy storage circuit, and the oscillating circuit is respectively connected with the energy storage circuit and an ultrasonic sensor of electronic equipment; the control circuit is used for controlling the energy storage circuit to provide compensation energy for the oscillating circuit according to a control signal; wherein the control signal is determined according to the temperature of the electronic equipment; the oscillating circuit is used for generating a driving signal according to the compensation energy and energy generated by the oscillating circuit; the driving signal is used for driving the ultrasonic sensor to transmit an ultrasonic signal. By adopting the driving circuit, the influence of the temperature of the electronic equipment on the amplitude of the sine wave signal output by the oscillating circuit can be reduced, so that the influence on the emitted ultrasonic energy is reduced, and the fingerprint identification effect is ensured.

Disclosed is an apparatus for excitation signal generation for a resolver. The apparatus includes a sine wave generator that generates a sine wave based on a square wave, an amplifier that amplifies the sine wave, a differential signal generator that converts, into a differential signal, the amplified sine wave, a driver that inputs the differential signal to a coil, and a processor that generates an excitation signal by increasing a voltage of the sine wave from a start voltage to a target voltage through at least one of the sine wave generator and the amplifier based on a transient current that flows into the coil in a transient response interval.

The invention provides a radio frequency power supply device and a radio frequency power supply system, the radio frequency power supply device comprises a radio frequency source, a gating unit and an analog impedance unit, the radio frequency source is used for outputting initial radio frequency electric energy, and the analog impedance unit has a first impedance value. The gating unit is selectively connected with the analog impedance unit and the load, the gating unit is used for being alternately connected with one of the analog impedance unit and the load at a preset period, and the preset period is larger than the period of the initial radio frequency electric energy. When the gating unit is connected with the analog impedance unit, an electric energy transmission path from the radio frequency source to the analog impedance unit is conducted, and the initial radio frequency electric energy is transmitted to the analog impedance unit, so that the electric energy of the initial radio frequency electric energy is consumed through the analog impedance unit; and when the gating unit is connected with the load, the electric energy transmission path from the radio frequency source to the load is conducted, and the initial radio frequency electric energy is transmitted to the load so as to supply energy to the load. According to the invention, the pulse-type radio frequency electric energy can be prevented from generating oscillation electric energy in the output process.

System (100) for generating a sinusoidal signal (90), comprising: an input interface (10) designed to receive a periodic input signal; a variable input path (20) with a path input (21) connected to the input interface (10), a path output (22) and an element (29) electrically connected between path input (21) and path output (22) for forming a square wave signal, wherein the variable input path (20) is configured to output a square wave signal at the path output (22) with the periodicity of the input signal applied to the path input (21); a counter module (30) connected to the path output (22) and designed to count edges of the square wave signal and to output a period and / or a frequency of the square wave signal; a digital signal generation module (40) connected to the counter module (30), which is configured to output a plurality of amplitude values ​​(92) of the sinusoidal signal (90) for a plurality of phase values ​​(91) of the sinusoidal signal (90) based on the period and / or the frequency of the square wave signal.

The invention relates to the technical field of encoder calibration, in particular to an encoder calibration circuit, a calibration method and an integrated circuit chip. According to the circuit, the input end of an analog signal comparison circuit is connected with a signal source and the reference signal output end of a processor, and the analog signal comparison circuit is used for comparing a reference signal output by the processor with an original sinusoidal signal output by the signal source and outputting a first comparison result through the output end; comparing the reference signal with the original cosine signal output by the signal source, and outputting a second comparison result through the output end; the processor obtains a first comparison result and a second comparison result, and outputs a first difference value between the original sinusoidal signal offset and the original cosine signal offset to the offset adjusting circuit; the offset adjusting circuit adjusts the offset of the original sinusoidal signal and the original cosine signal based on the first difference value, and outputs the sinusoidal signal after offset adjustment and the cosine signal after offset adjustment.

The embodiment of the utility model discloses a technical scheme, and provides a sine wave generating circuit which generates PWM signals through an amplification function circuit 11 formed by a PWM controller U1 and control function circuits 12 (U2A and U2B), and then converts the PWM signals into smooth sine waves through LC filtering function circuits L1 and C2-C6 to output. The whole circuit controls the amplitude and frequency of the output sine wave by adjusting the duty ratio of the PWM signal, and is suitable for an application scene needing to stabilize the sine wave signal. Compared with a traditional sine wave generating circuit (an amplifying circuit, a positive feedback network, a frequency selecting network, a radiation stabilizing circuit and the like), the sine wave generating circuit provided by the utility model is simpler in circuit structure and lower in price.

The invention provides an analog signal amplitude modulation circuit, a quartz tuning fork gyroscope circuit and a quartz tuning fork gyroscope, the amplitude modulation circuit comprises an operational amplifier U1, resistors R1, R2, R3 and R4 and a JFET, the JFET is represented by Q1, the number of the resistors R1 is two, an input signal of the amplitude modulation circuit is a high-frequency input signal ui, and an output signal of the amplitude modulation circuit is a high-frequency output signal uo; current generated by a high-frequency input signal ui enters the two branches at the same time, for the first branch, the high-frequency input signal ui flows to the ground after passing through one resistor R1 and parallel connection of R3 and Q1, and input voltage of the in-phase end of the operational amplifier is partial voltage of parallel connection of R3 and Q1; for the second branch, the current generated by the high-frequency input signal ui flows to the ground after passing through another resistor R1 and another resistor R2, and the current generated by the high-frequency input signal ui also flows into the inverting input end of the operational amplifier; in addition, the current generated when the high-frequency output signal uo passes through the R4 flows out of the inverting input end of the operational amplifier to form a negative feedback circuit. According to the invention, the higher harmonic interference of the gyro signal is reduced.

A power factor correction (PFC) controller for a PFC switching power supply is disclosed. The PFC controller includes an AC sense terminal, a DC sense terminal, and a reference signal generator coupled to the AC sense terminal. The reference signal generator is configured to receive a divided reference signal generated based on a modified version of an AC input signal and generate a synthesized reference signal using information indicative of an amplitude and a frequency of the divided reference signal. The reference signal generator is further configured to select one of the divided and synthesized reference signals as an output reference signal based on a current amplitude of the divided reference signal. The PFC controller is configured to, based on the output reference signal and a DC voltage sensed on the DC sense terminal, regulate output power provided to a downstream power converter coupled to the PFC switching power supply.

The present invention relates to the technical field of electronic equipment, and provides an analog signal output circuit, an electrical stimulation device and an electrical stimulation method. The analog signal output circuit includes a boost voltage regulation module, a digital-to-analog module and an output electrode. The boost voltage regulation module includes a chip U2, a resistor R5, a resistor R6, a resistor R8, a transistor Q1 and a capacitor C9; a branch at the FB pin of the chip U2 is connected to the collector of the transistor Q1 through the resistor R6, the base of the transistor Q1 is connected in series with the resistor R8, the emitter of the transistor Q1 is grounded, and the capacitor C9 is connected in parallel between the collector and the emitter of the transistor Q1; another branch at the FB pin is connected to the power supply output terminal VCES through the resistor R5. The digital-to-analog module includes a chip U5, the VCC pin of the chip U5 is connected to the power supply output terminal VCES, the VOUT0 pin of the chip U5 is connected to the first plug of the output electrode; the VOUT1 pin of the chip U5 is connected to the second plug of the output electrode.

The invention provides a double-frequency driving method for a pulse high-frequency ionization device, which comprises the following steps of: generating high-frequency low power for cold start ignition by using a continuous output high-frequency driving signal which is generated by a double-frequency driving device and is used for driving a low-power high-frequency power source; a pulse output high-frequency driving signal generated by the double-frequency driving device and used for driving the low-power high-frequency power source is used for generating high-frequency low power used for maintaining cold start ignition; the pulse output low-frequency driving signal generated by the double-frequency driving device and used for driving the high-power and high-frequency power source is used for generating low-frequency and high-power for generating high-yield plasma; according to the pulse high-frequency ionization device disclosed by the invention, two driving frequencies, the third-party power amplifier and the third-party adjustable vector impedance matching device are adopted; the plasma pulse power requirement of the specific frequency of a user and the pulse power requirement of the pulse high-frequency ionization device in the cold start ignition stage and the plasma continuation state maintaining stage can be considered at the same time.

The utility model discloses an arbitrary waveform generator which comprises an input connector, an output connector, a first waveform generation module, a second waveform generation module, a 40M crystal oscillator, an 8M crystal oscillator, a digital-to-analog conversion module, a first operational amplifier module, a second operational amplifier module, a first gain amplifier module and a second gain amplifier module. The input ports SCLK, SDIO and CS of the first waveform generation module and the second waveform generation module are in communication connection with the SPI; the 40M crystal oscillator and the 8M crystal oscillator are connected between CLKP ports of the first waveform generation module and the second waveform generation module; an SCL input port and an SDA input port of the digital-to-analog conversion module are respectively connected with an I2CSCL1 and an I2CSDA1 on the input connector; according to the utility model, SPI communication is built in, an on-chip mode memory is integrated, complex waveforms can be directly generated, the frequency and the degree of symmetry can be adjusted, and different waveforms, except for common sine waves, square waves and sawtooth waves, can alternately appear.

The invention aims to provide a system and a method for generating a three-phase horn modulated wave from a three-phase sinusoidal modulated wave. The system comprises a three-path multiplier (1), an amplitude conversion module (2), a first summation module (3), a channel selection module (4), a second summation module (5) and a third summation module (6). The method comprises the following steps: a, generating an original sine wave signal by using a sine modulation wave generation system; b, performing equal amplitude transformation on the three-phase original sine wave signal by using an amplitude transformation module 2 to obtain a synthetic amplitude Uamp of the three-phase original signal; c, setting a proportionality coefficient Coe, and rectifying the original sine wave signal by using a multiplier (1); d, obtaining the content Ucom of the injected original signal by using a second summation module (5); and e, superposing the original sine wave signal and the content Ucom of the injected original signal obtained in the step d to obtain a horn modulation wave signal. The invention is applied to the technical field of power electronics.

The invention provides a radio frequency power supply device and a radio frequency power supply system, the radio frequency power supply device comprises a radio frequency source, a gating unit and N output ends, the radio frequency source is used for outputting initial radio frequency electric energy, and the N output ends are used for being connected with N loads in a one-to-one correspondence mode. The gating unit comprises N gating modules, and each gating module is used for selectively connecting or disconnecting an electric energy transmission path between the radio frequency source and the corresponding output end so as to correspondingly transmit or stop transmitting the initial radio frequency electric energy to the corresponding load. Wherein the N gating modules comprise at least two target gating modules, each target gating module periodically conducts an electric energy transmission path between the radio frequency source and the corresponding output end, and when any target gating module conducts the electric energy transmission path between the radio frequency source and the corresponding output end, the radio frequency source is switched on by the target gating module. And the other N-1 gating modules all disconnect the electric energy transmission path between the radio frequency source and the corresponding output end. According to the invention, pulse-type radio frequency electric energy can be output to a plurality of loads.

The invention provides a sine wave excitation generation and overcurrent protection circuit of a displacement sensor, which relates to the technical field of airborne displacement sensors and comprises a second-order filter circuit, a blocking circuit, a proportional amplification circuit and a push-pull output circuit. The input of the second-order filter circuit is connected with an input square wave signal, and the second-order filter circuit is used for performing second-order low-pass filtering on the square wave signal; the input of the blocking circuit is connected with the output of the second-order filter circuit and is used for filtering a direct current component in the sine wave signal; the input of the proportional amplification circuit is connected with the output of the blocking circuit, and the proportional amplification circuit is used for conditioning the amplitude of the processed sine wave signal; and the input of the push-pull output circuit is connected with the output of the proportional amplification circuit and is used for improving the driving output capability so as to output a sensor excitation sine wave signal meeting the sensor excitation driving capability requirement. The circuit design structure is simple, the cost is low, hardware closed-loop control is adopted, the response speed is high, excitation signal output and overcurrent cut-off can be effectively carried out, and the precision of the output signal is not affected.

The invention discloses a signal simulator for a nuclear power station loose component monitoring system, and relates to the technical field of nuclear power station equipment monitoring, a man-machine interaction module receives signal parameters of an impact signal to be simulated by the signal simulator, and a controller controls a signal generation module to generate the signal parameters, the method comprises the following steps: generating a sine wave basic signal with a frequency corresponding to a signal parameter through a direct digital frequency synthesizer, converting the sine wave basic signal into an impact pulse with a width corresponding to the signal parameter through a pulse forming network, and carrying out frequency spectrum shaping on the impact pulse through a filter corresponding to the material of a to-be-simulated loose component. And finally, the impact pulse after frequency spectrum shaping is adjusted to an amplitude corresponding to a signal parameter through a gain amplification circuit, and a simulated impact signal is obtained. According to the invention, different signal characteristics of the impact signal generated by the impact of the loose part can be simulated from multiple angles, and the simulation precision of the impact signal generated by the impact of the loose part is improved.

The application relates to a resolver sensor signal simulation circuit. The application comprises a differential amplification circuit, a sine signal conversion circuit, a cosine signal conversion circuit, a first transformer isolation circuit and a second transformer isolation circuit. The excitation signal output end of an external controller is connected with the input end of the differential amplification circuit. The first input end of the sine signal conversion circuit and the first input end of the cosine signal conversion circuit are both connected with the output end of the differential amplification circuit. The second input end of the sine signal conversion circuit and the second input end of the cosine signal conversion circuit are both connected with the external control signal output end. The external control signal output end is used for outputting an external control signal. The output end of the sine signal conversion circuit is connected with the sine signal input end of the external controller through the first transformer isolation circuit. The output end of the cosine signal conversion circuit is connected with the cosine signal input end of the external controller through the second transformer isolation circuit. The application has the advantages of simple implementation and strong anti-interference performance.

A device comprises a radio frequency signal generator (100) which comprises a first signal path, a second signal path, a signal combiner (130), and a quadrature mixer (140). The first signal path is configured to generate an analog pulse (P1). The second signal path is configured to generate a delayed analog pulse (P2). The signal combiner is configured to combine the analog pulse and the delayed analog pulse to generate an analog compensation pulse (P3). The quadrature mixer is configured to utilize the analog pulse and the analog compensation pulse to modulate quadrature local oscillator signals and generate a radio frequency control signal (RF_OUT). The radio frequency control signal comprises a frequency that corresponds to a frequency of the quadrature local oscillator signals, and a pulse shape which comprises a shape of the analog pulse modified by a shape of the analog compensation pulse.

A novel adjustable light-operated memristive circuit belongs to the technical field of circuit design and is specifically provided with a magnetic signal generating circuit, an index signal generating circuit and a signal processing circuit, the input end of the magnetic signal generating circuit is connected with input voltage, the magnetic signal generating circuit is connected with a photoresistor, and the photoresistor is connected with the index signal generating circuit. The output end of the magnetic signal generating circuit is connected with the input end of the signal processing circuit through the index signal generating circuit. The beneficial effects are that the photoresistor is connected to the magnetic signal generation circuit, so that the circuit model can maintain the resistance state during power failure, and the resistance value can be changed according to illumination during power-on. Besides, the input charge state is regulated and controlled through the photoresistor, and the circuit resistance can change along with the charge quantity, so that different memristor hysteresis loop models are simulated, and meanwhile, a hysteresis loop simulation curve can be finely adjusted. The model not only improves the simulation precision of the memristor model, but also provides a new thought for optimizing the performance of the memristor in practical application.