26results about "Pulse combined modulation" patented technology

The invention discloses a single side band time modulator with ultra-wideband instantaneous bandwidth. The single side band time modulator is provided with an orthogonal generation unit, an I-path modulation unit, a Q-path modulation unit, an output buffer unit and a time sequence control unit. Radio frequency input differential signals RFin + and RFin-are connected with the orthogonal generation unit, the output of the orthogonal generation unit is connected with the I-path modulation unit and the Q-path modulation unit, then input signals are modulated in the I-path modulation unit and the Q-path modulation unit respectively, the output end of the output buffer unit is the output end of the single-side-band time modulator, a modulation signal RFout is output at a single end, and the output end of the output buffer unit is connected with the output end of the single-side-band time modulator. The digital time sequence unit controls the I-path modulation unit and the Q-path modulation unit to realize vector modulation, so that a single sideband time modulation function is realized, extremely high modulation frequency input is realized, and the ultra-wideband instantaneous bandwidth is realized.

The signal generator includes the following: an oscillation generation circuit, configured to generate an initial oscillation signal based on an oscillation control signal; a duty cycle correction circuit, connected to an output end of the oscillation generation circuit and configured to adjust a duty cycle of the initial oscillation signal based on a duty cycle control signal, to generate an adjusted oscillation signal; an output interface, connected to an output end of the duty cycle correction circuit and configured to output the adjusted oscillation signal to an external test system; and an amplitude adjustment circuit, connected to the output end of the duty cycle correction circuit and configured to adjust an amplitude of the adjusted oscillation signal based on an amplitude control signal, to generate a test signal.

The invention discloses a signal acquisition control method, a matching controller, a matcher and semiconductor process equipment, and the method comprises the steps: recording the power value of a radio frequency power signal collected by a sensor according to a preset period, determining the period and the duty ratio of the radio frequency power signal according to the power value and the preset period, and outputting the period and the duty ratio of the radio frequency power signal; a sensor is controlled to acquire a radio frequency power signal according to a period and a duty ratio, so that a matcher comprising the sensor can acquire the radio frequency power signal without having a corresponding matched pulse signal hardware port to send and receive a pulse signal, impedance matching is performed according to the radio frequency power signal, and the matching precision is improved. And the applicability of the matcher can be further improved.

The invention discloses an electronic device which comprises a first transistor, a second transistor, a plurality of driving units and an electronic unit. The first transistor includes a first control terminal. The second transistor is coupled to the first transistor and includes a second control terminal for receiving the pulse signal. The pulse signal has a pulse width. The driving units are connected in parallel. Each driving unit comprises an input end, an output end and a control end. The input end is coupled to a first control end, the output end is coupled to a node, and the control end receives an enable signal. The electronic unit is coupled to the node. The driving units respectively provide current to the electronic unit according to the received enable signals, and the current passing through the electronic unit is modulated according to the pulse width of the pulse signal.

The present application relates to a kind of multi-mode noise interference signal generation method, belong to signal interference technical field, solve the problem that existing cannot dynamically flexibly generate the interference signal of multiple modulation modes and the high development complexity.For method includes: according to noise kind and interference mode, obtain first noise sequence, second noise sequence, third noise sequence, noise interference bandwidth and center frequency;Carrier signal is generated based on center frequency;First noise sequence and noise interference bandwidth are passed into first multiplier, then the output result and carrier signal are passed into adder, and first complex signal is output by direct digital synthesizer;First complex signal and second noise sequence are passed into complex multiplier, and second complex signal is output;Second complex signal and third noise sequence are passed into second multiplier, and noise interference signal is output.The generation of multi-mode noise interference signal dynamically flexibly is realized.

According to an embodiment of the present disclosure, a multi-phase clock generation circuit and a multi-phase clock calibration circuit are provided. The multi-phase clock generation circuit includes a multi-phase clock generation circuit; a multi-phase clock error detection circuit, including a first set of DC component extraction modules, a phase difference detection circuit, a second set of DC component extraction modules, a multiplexing module, and a comparison module, wherein the multi-phase clock signals are input to the comparison module via the first set of DC component extraction modules and the multiplexing module, and the multi-phase clock signals are input to the comparison module via the phase difference detection circuit, the second DC component extraction module, and the multiplexing module, and the comparison module outputs a detected error; a digital control circuit that assigns a selection module number to each sub-module in the multiplexing module; a multi-phase clock adjustment circuit that includes a duty cycle adjustment circuit and a phase adjustment circuit. The embodiments of the present disclosure can effectively reduce the calibration process of the chip, simplify the chip design, and reduce costs.

The present electronic generator of modulated subcarrier pulse signals includes a module for modulating a pulse train, the position and amplitude of which are controllable, forming a switching signal; a switching module, connected to the output of the module for modulating the pulse train, including at least one transistor, controlled by the switching signal, a voltage-controlled frequency-locking oscillator having a frequency-locking band around a free oscillation frequency controlled by a control voltage, connected to the output of the switching module, the switching module making possible the injection of a periodic pulse signal having a frequency spectrum including at least one frequency line within the frequency locking band. Such arrangement makes it possible to obtain, at the output of the oscillator, frequency-controlled, phase-controlled and amplitude-controlled modulated subcarrier pulsed signals.

The invention discloses a variational mode decomposition method based on quaternary Fourier transform, which comprises the following steps of: selecting parameters, mode number, iteration step length and convergence tolerance by using a sliding window, and calculating short-time quaternion Fourier transform of a signal along an imaginary number unit axis; the method comprises the following steps: initializing an iteration round, quaternary short-time Fourier transform of modals, a time-varying center frequency and a dual operator, updating the short-time quaternary Fourier transform and the time-varying center frequency of each modal, performing dual rising, updating the dual operator, calculating an iteration error, judging whether the iteration error is smaller than a convergence tolerance or not, performing inverse transformation on all modals, and performing inverse transformation on all modals. And time domain estimation of the mode is obtained. The method can effectively process non-stationary and complex-valued signals, improves the precision and reliability of multi-channel signal processing, solves the problems of frequency alignment, mode aliasing and the like, can effectively process the non-stationary and complex-valued signals, improves the precision and reliability of multi-channel signal processing, and improves the accuracy and reliability of multi-channel signal processing. And meanwhile, the problems of frequency alignment, mode aliasing and the like are solved.

The present invention provides a method for modulating the envelope of a GHz pulse train, a laser envelope modulation system, and a femtosecond laser. According to a first aspect of an embodiment of the present application, a method for modulating the envelope of a GHz pulse train is proposed, comprising: downconverting the main frequency of the pulse train; modulating the sub-pulse frequencies in the pulse train after the main frequency downconversion to the GHz level; waveform-modulating the pulse train after the sub-pulse modulation; and amplifying the power of the waveform-modulated pulse train. The present invention enables an envelope independent of the rising and falling edge speeds of an acousto-optic modulator (AOM) and optimizes the amplified pulse envelope.

The invention provides a low-power-consumption analog signal direct modulation microsystem and method which can be applied to the technical field of signal modulation. The system comprises: an information source module configured to obtain an external signal in a predetermined time period and generate an initial analog signal according to the external signal; the filter circuit module is electrically connected with the information source module and is configured to filter interference signals in the initial analog signals to obtain intermediate analog signals; the matching circuit module is electrically connected with the filter circuit module and is configured to adjust the amplitude and the frequency of the intermediate analog signal based on the target amplitude and the target frequency to obtain a matching signal; and the oscillation module is electrically connected with the matching circuit module and is configured to generate and output a target frequency modulation signal according to the amplitude change and the frequency change of the matching signal in the preset time period.

Electronic generator of pulse signals under modulated carrier and associated radio frequency signal transmitter This electronic generator of pulse signals under modulated carrier includes a module (15) for modulating a pulse train whose position and amplitude are controllable, forming a switching signal (S3); a switching module (16), connected at the output of the pulse train modulation module (15), comprising at least one transistor (22), controlled by said switching signal (S3); a voltage-controlled frequency-locked oscillation module (18), having a frequency-locked band around a free oscillation frequency controlled by a control voltage, connected at the output of the switching module (16); the switching module allowing the injection of a periodic pulse signal (S4) having a frequency spectrum comprising at least one frequency line in said frequency-locked band.This arrangement allows the output of the oscillation module to produce pulsed signals (S5) with a modulated carrier controlled in frequency, phase, and amplitude. See Figure 1 for abbreviations.

This invention discloses a hybrid modulation method for suppressing EMI in motor drive chips. Step S1: The oscillation circuit connected to the charge pump circuit combines periodic modulation and random modulation to perform hybrid modulation. Periodic modulation is used for coarse adjustment, modulating the charging and discharging current of the oscillation circuit with a triangular wave signal to obtain a periodically changing oscillation frequency. Random modulation is used for fine adjustment, adjusting the output signal of the oscillation circuit. Based on the coarse adjustment, the oscillation circuit's edge jitters at a certain frequency, randomly changing the delay to slow down the switching edge speed. This invention discloses a hybrid modulation method for suppressing EMI in motor drive chips, employing a combination of periodic and random modulation techniques. Periodic modulation is used for coarse adjustment, and random modulation for fine adjustment, thereby reducing the EMI of the charge pump circuit.

The present invention belongs to the fields of automatic control technology and power electronics technology, and specifically relates to a multi-purpose composite plasma coating bias power supply. The power supply can output DC negative bias, unipolar pulse negative bias, DC superimposed unipolar pulse negative bias mode, asymmetric bipolar pulse bias mode or DC superimposed bipolar pulse bias with different output waveform characteristics as required. In addition, the pulse voltage amplitude, frequency and duty cycle of the negative bias can be adjusted, the DC voltage amplitude of the DC superimposed pulse negative bias can be adjusted, the negative bias can be set to work in two modes: high voltage and low current mode or low voltage and high current mode, and the positive pulse voltage amplitude and duty cycle can be adjusted.

According to an embodiment of the present disclosure, a multi-phase clock generation circuit and a multi-phase clock calibration circuit are provided. The multi-phase clock generation circuit comprises a multi-phase clock generation circuit; a multi-phase clock error detection circuit comprises a first group of direct current component extraction modules, a phase difference detection circuit, a second group of direct current component extraction modules, a multi-path selection module and a comparison module, and multi-phase clock signals are input to the comparison module through the first group of direct current component extraction modules and the multi-path selection module. A multi-phase clock signal is input into the comparison module through the phase difference detection circuit, the second direct current component extraction module and the multi-path selection module, and the comparison module outputs a detection error; the digital control circuit is used for distributing a selection module number for each sub-module in the multi-path selection module; the multi-phase clock adjusting circuit comprises a duty ratio adjusting circuit and a phase adjusting circuit. According to the embodiment of the invention, the calibration process of the chip can be effectively reduced, the chip design is simplified, and the cost is reduced.

An electronic device includes a first transistor, a second transistor, a plurality of driver units, and an electronic unit. The first transistor includes a first control end. The second transistor is coupled to the first transistor and includes a second control end for receiving a pulse signal. The pulse signal has a pulse width. The driver units are coupled in parallel. Each driver unit includes an input end coupled to the first control end, an output end coupled to a node, and a control end for receiving an enable signal. The electronic unit is coupled to the node. The driver units provide currents to the electronic unit according to received enable signals. A current flowing through the electronic unit is modulated according to the pulse width of the pulse signal.

An electronic device (10A, 10B) includes a first transistor (Tcm) with a control end (C1), a second transistor (Tsw) with a second control end (C2) for receiving a pulse signal (VP), a plurality of driver units (20a, 20b, 30a, 30b), and an electronic unit (D1). The driver units (20a, 20b, 30a, 30b) are coupled in parallel. Each driver unit (20a, 20b, 30a, 30b) includes an input end (A) coupled to the first control end (C1), an output end (B) coupled to the electronic unit (D1), and a control end (C) for receiving an enable signal (S1, S2). The driver units (20a, 20b, 30a, 30b) provide currents to the electronic unit (D1) according to received enable signals (S1, S2). A current (Id) flowing through the electronic unit (D1) is modulated according to the pulse width (W1, W2, W3, W4) of the pulse signal (VP).

The invention discloses a three-phase modulation wave waveform adjustment method and device, equipment and a storage medium. The method comprises the following steps: acquiring a target three-phase modulation wave and preset sampling time in a three-phase motor; determining a target three-phase modulation wave period, a non-zero voltage vector and non-zero voltage vector time corresponding to the non-zero voltage vector from the target three-phase modulation wave; under the condition that the non-zero voltage vector time is smaller than the preset sampling time, complementary non-zero voltage vectors are symmetrically inserted in front of and behind the middle moment of the target three-phase modulation wave period; adjusting the non-zero voltage vector time to obtain non-zero voltage vector adjustment time; and adjusting the target three-phase modulation wave based on the inserted complementary non-zero voltage vector and the non-zero voltage vector adjustment time to obtain a three-phase adjustment modulation wave. According to the invention, the problem of asymmetric periodic waveform of the three-phase modulation wave can be solved and the operation noise of the three-phase motor can be reduced.

A system and method is provided including a first pulse width modulation (PWM) generator circuit including a first timer to generate a first cycle count, a first configuration register to define characteristics of a first electrical pulse to be generated, and a trigger cycle count specifying a timing of a first trigger signal, and a first load enable input to load a new configuration value into the first configuration register, a second PWM generator circuit including a second timer to generate a second cycle count, a second configuration register to define characteristics of a second electrical pulse to be generated, a second load enable input to load a new configuration value into the second configuration register, and a load enable selector to selectively drive the second load enable input based on the first trigger signal.

The present invention belongs to the field of signal processing technology, and discloses a multi-target signal synthesis method supporting loop playback, including parsing signal parameters, processing the center frequency of multiple signals, extracting the periodic parameters that need to be processed from each signal according to its modulation type, calculating the optimal signal sampling point number ram under the sampling rate and maximum ram requirements, independently generating N signals according to the obtained sampling point number and the adjusted parameter value, loading the baseband frequency shift, amplitude and phase information of each signal, and directly superimposing multiple signals in the time domain to obtain the final baseband synthesis signal. The method proposed by the present invention performs periodic control on multiple signals and synthesizes the final signal, does not limit the number, type, parameters, etc. of signals, is implemented through software, and reduces the consumption of hardware resources.

This electronic pulse signal generator under modulated carrier comprises a modulation module (15) for a pulse train whose position and amplitude are controllable, forming a switching signal (S3); a switching module (16), connected at the output of the pulse train modulation module (15), comprising at least one transistor (22), controlled by said switching signal (S3), a voltage-controlled frequency-locked oscillator (18), having a frequency-locked band around a free oscillation frequency controlled by a control voltage, connected at the output of the switching module (16), the switching module allowing the injection of a periodic pulse signal (S4) having a frequency spectrum comprising at least one frequency line in said frequency-locked band.This arrangement allows us to obtain at the output of the oscillator impulse signals (S5) under modulated carrier controlled in frequency, phase and amplitude.

The invention discloses a TLTs-based multi-stage floating superposition high-voltage narrow pulse modulator, which comprises M floating power supplies, M single pulse forming circuits, a driving circuit of the floating power supplies, a high-voltage isolation transformer and a power supply controller, and is characterized in that the driving circuit and the high-voltage isolation transformer supply power to the M floating power supplies; the multi-level floating superposition is formed by superposing W-level transmission line transformers to form a W-time high-voltage pulse amplitude, each single pulse forming circuit outputs a W-time Vin pulse voltage, Vin is a power supply voltage of each single pulse forming circuit and is provided by a corresponding floating power supply, and each single pulse forming circuit outputs a W-time Vin pulse signal; and the amplitude of a pulse signal formed by isolating and superposing the M groups of single pulse forming circuits is N times of Vin. According to the invention, a combined design is adopted, and pulse signals with different high-voltage requirements can be generated by adopting flexible combination of different numbers of single pulse circuits and different numbers of TLTs according to performance and index requirements.

The present invention provides a pulse width modulation (PWM) driving circuit, method and testing equipment, which relate to the technical field of integrated circuit design. The PWM driving circuit includes: a PWM signal generation and processing circuit for generating a low-voltage PWM signal with a high slew rate, and amplifying the low-voltage PWM signal; an AC coupling driving circuit for increasing the amplitude of the PWM signal output by the PWM signal generation and processing circuit to the amplitude of the power rail of the first adjustable positive and negative power supply; a driving capability enhancement circuit for enhancing the driving current capability of the PWM signal output by the AC coupling driving circuit; a PWM signal output processing circuit for maintaining the same slew rate as the PWM signal output by the driving capability enhancement circuit, and adjusting the output swing to achieve output of a high-power, high-swing, high-slew rate PWM signal. The embodiment of the present invention can achieve output of a high-power, high-swing, high-slew rate PWM signal.

The application discloses a variational mode decomposition method based on quaternion Fourier transform, uses a sliding window to select parameters, a mode number, an iteration step and a convergence tolerance, calculates a short-time quaternion Fourier transform of a signal along an imaginary unit axis, initializes an iteration round, a quaternion short-time Fourier transform of a mode, a time-varying center frequency and a dual operator, updates the short-time quaternion Fourier transform and the time-varying center frequency of each mode, raises the dual and updates the dual operator, calculates an iteration error and judges whether the iteration error is less than the convergence tolerance, performs inverse transformation on all modes, and obtains time-domain estimation of the modes. The application can effectively process non-stationary and complex-valued signals, improves the precision and reliability of multi-channel signal processing, and solves problems such as frequency alignment and mode aliasing.

Some embodiments include a high-voltage pulse generating power supply. The high-voltage pulse generating power supply may include: a high-voltage pulse generator having an output that provides pulses having an amplitude greater than about 1 kV, a pulse width less than about 1 μs, and a pulse repetition frequency greater than about 20 kHz; a plasma chamber; and an electrode disposed within the plasma chamber, the electrode being electrically coupled to the output of the high-voltage pulse generator to generate an electric field within the plasma chamber.

Electronic generator of pulse signals under modulated carrier and associated radio frequency signal transmitter This electronic generator of pulse signals under modulated carrier includes a module (15) for modulating a pulse train whose position and amplitude are controllable, forming a switching signal (S3); a switching module (16), connected at the output of the pulse train modulation module (15), comprising at least one transistor (22), controlled by said switching signal (S3); a voltage-controlled frequency-locked oscillation module (18), having a frequency-locked band around a free oscillation frequency controlled by a control voltage, connected at the output of the switching module (16); the switching module allowing the injection of a periodic pulse signal (S4) having a frequency spectrum comprising at least one frequency line in said frequency-locked band.This arrangement allows the output of the oscillation module to produce pulsed signals (S5) with a modulated carrier controlled in frequency, phase, and amplitude. See Figure 1 for abbreviations.

The present application provides a write circuit, method and array, including a multi-pulse generation module for generating multiple pulse signals; wherein the multiple pulse signals include multiple first pulse signals and second pulse signals that overlap in sequence, and the writing directions of the first pulse signals and the second pulse signals are opposite; the amplitude of the first pulse signal is gradually decreasing, and the amplitude of the second pulse signal between two adjacent first pulse signals is smaller than the amplitude of the two adjacent first pulse signals, and / or the pulse width of the first pulse signal is gradually decreasing, and the pulse width of the second pulse signal between two adjacent first pulse signals is smaller than the pulse width of the two adjacent first pulse signals; a magnetic storage device in an intermediate state is deterministically flipped by multiple pulse signals. The present application can provide a technical solution that can improve the data writing success rate of a magnetic storage device without optimizing the MTJ etching process.