66results about "Pulse frequency/rate modulation" patented technology

The invention discloses a peak code modulation circuit based on a dynamic memristor, which comprises the dynamic memristor and a signal conversion module, and is characterized in that the signal conversion module comprises a signal isolation module, a feature extraction module and a pulse conversion module which are connected in sequence. The dynamic memristor generates a voltage signal with a slow-rising and steep-falling characteristic under constant current input. The signal isolation module comprises a high-impedance input buffer circuit; the feature extraction module comprises an asymmetric time constant signal processing circuit used for performing enhanced extraction on the steep drop feature of the memristor output signal; and the pulse conversion module comprises a dual-threshold positive feedback hysteresis comparison circuit and is used for converting the output signal of the feature extraction module into a rectangular digital pulse. The circuit is specially designed according to the characteristics of the memristor, is simple in structure, is easy to integrate, can achieve the efficient conversion from an analog signal to a standard digital pulse, and is suitable for the fields of neuromorphic calculation and low-power-consumption signal processing.

The present disclosure provides an approach that determines a pulse frequency modulation (PFM) period of a buck regulator. The PFM period comprises a first charging stage and a first discharging stage, and wherein the buck regulator switches from the first discharging stage to the first charging stage based on comparing a feedback voltage to a low threshold voltage. The approach generates a pseudo random pulse at a pseudo random period, wherein the pseudo random period is independent from the low threshold voltage. Then, the approach initiates a transition from a second discharging stage to a second charging stage based on the pseudo random pulse.

A correction circuit for a switching converter counters undesired reduction of switching frequency in response to a decrease in a load current at a converter output node. Detection circuitry receives a reference clock signal indicative of a lower bound for the switching frequency of the converter and a pulsed drive signal indicative of the switching frequency of the converter. In response to the switching frequency of the converter falling below said lower bound for the switching frequency of the converter, the detection circuitry produces an error signal. Current sink circuitry coupled to the output node of the converter sinks from the output node of the converter corrective current in response to receipt of the error signal from the detection circuitry.

The invention relates to the technical field of crystal oscillator calibration, and discloses a frequency calibration method, device and equipment of a crystal oscillator and a storage medium. Clock signals are continuously output, the signals and environment data are recorded, the signals and the environment data are fused, deviation analysis characteristics are generated, and the deviation characteristics are transmitted to a network platform. According to the method, through real-time monitoring, intelligent analysis and prediction, the precision and efficiency of frequency calibration are improved, the system stability is enhanced, and the system reliability is improved. The method is suitable for crystal oscillator frequency adjustment in a complex environment, and solves the problem that a crystal oscillator depends on manual regular calibration in the prior art.

A switching converter controller includes: mode control logic; and a pulse-frequency modulation (PFM) timer circuit coupled to the mode control logic. The PFM timer circuit includes: a first terminal; a second terminal; a digital-to-analog converter (DAC); a current source; a capacitor; and a comparator. A first terminal of the DAC is coupled to the first terminal of the PFM timer circuit. The current source has a first terminal, a second terminal, and a third terminal. The second terminal of the current source is coupled to a second terminal of the DAC. A first terminal of the capacitor is coupled to the first terminal of the current source. The comparator has first, second, and third terminals. The first terminal of the comparator is coupled to the first terminal of the capacitor. The third terminal of the comparator is coupled to the second terminal of the PFM timer circuit.

A power converter system, comprising: a main device; one or more secondary devices, each comprising: one or more switching converters; and a signal generator configured to generate a modulated signal for controlling the one or more switching converters, wherein a period of the modulated signal is pseudo- randomly adjusted within a predetermined period range; and a data bus comprising a data line for data transmission between the main device and the plurality of secondary devices, and a clock line for transmitting an interface clock signal; wherein the main device is configured to transmit a synchronization frame to the plurality of secondary devices; wherein each of the one or more secondary devices is configured to time align generation of the modulated signal in dependence on the synchronization frame.

The present disclosure provides a method of determining a pulse frequency modulation (PFM) period of a buck regulator. The PFM period comprises a first charging phase and a first discharging phase, and wherein the buck regulator switches from the first discharging phase to the first charging phase based on comparing a feedback voltage to a low threshold voltage. The method generates a pseudo-random pulse at a pseudo-random period, where the pseudo-random period is independent of the low threshold voltage. The method then initiates a transition from a second discharge phase to a second charge phase based on the pseudo-random pulse.

A switching converter is presented. The switching converter has a high side power switch coupled to a low side power switch at a switching node, a driver and a timing circuit. The driver generates a drive signal having a on-time to drive the high side power switch. The timing circuit generates a control signal to adjust the on-time during a load transient period.

The invention discloses a V-type frequency modulation signal generation method and system, and the method comprises the steps: obtaining a discrete model of a V-type frequency modulation signal, and obtaining a frequency increment and a frequency initial parameter through the first-order difference relation between the frequency and the phase of the discrete signal; taking the frequency increment, the frequency initial parameter and the constant term as positive frequency modulation digital control parameters, constructing a linear increasing sequence based on the frequency increment, obtaining instantaneous frequency values at different moments by sequentially superposing the frequency initial parameter, and superposing the constant term on the instantaneous frequency values at different moments to obtain a phase sequence of the positive frequency modulation slope; negation processing is carried out on the positive frequency modulation digital control parameters, and a phase sequence of a negative frequency modulation slope is obtained through calculation; and according to the sinusoidal waveform, converting the phase sequence into amplitude data, and generating a V-shaped frequency modulation signal. By optimizing parameter configuration logic and simplifying operation, the operation amount of control parameters and the data transmission amount in the signal generation process can be greatly reduced, the calculation efficiency is remarkably improved, and the consumption of calculation resources is reduced.

The subject matter of the present disclosure is a phase modulation system and method. In a phase modulation method, an enable signal may be sequentially generated based on a clock signal to generate an enable signal sequence, and a signal is delayed based on the enable signal sequence and a digital bit value by a delay value generated from a delay unit. The phase modulator may include a first delay circuit configured to: delay a clock signal based on a first delay value to generate a first delayed clock signal; and delaying a carrier signal based on the first delayed clock signal to generate a first delayed carrier signal; and a second delay circuit configured to: delay the first delayed clock signal based on a second delay value to generate a second delayed clock signal; and delaying the first delayed carrier signal based on the second delayed clock signal to generate a second delayed carrier signal.

The invention relates to the technical field of radio frequency power supplies, in particular to a high-power radio frequency power supply system and a fast automatic frequency modulation method, the high-power radio frequency power supply system comprises a radio frequency power supply system, and the radio frequency power supply system comprises a power supply module, a radio frequency signal driving module, a radio frequency power amplification and synthesis module, a load signal V / I detection module and a processor module; according to the rapid and automatic frequency modulation method for the radio frequency power supply, the reflection coefficient of the second modulation signal under the specific frequency is detected in real time, the output frequency of the radio frequency power supply is rapidly and automatically adjusted to the optimal state, and therefore efficient and stable operation of the radio frequency power supply system is ensured.

The embodiment of the utility model provides an atomizer circuit and an atomizer, and relates to the technical field of atomizers. The atomizer circuit comprises an oscillation signal generating module, a frequency adjusting module and an atomizing sheet. The oscillation signal generation module is connected with the frequency adjusting module and the atomization sheet. According to the atomizer circuit, the frequency of the output signal of the oscillation signal generation module can be adjusted through the frequency adjusting module, so that the frequency of the output signal of the oscillation signal generation module is matched with the lead-free piezoelectric ceramic atomization piece, and the good atomization effect is achieved.

The utility model belongs to the technical field of radars. The utility model provides a novel analog Doppler frequency shift signal generating circuit. The novel analog Doppler frequency shift signal generating circuit comprises a high-frequency signal input module, a mixer I, a mixer II, a filter module I, a filter module II, a local oscillator signal input module I, a local oscillator signal input module II and a radio frequency signal output module, the high-frequency signal input module is connected with the frequency mixer I, the frequency mixer I is respectively connected with the filtering module I and the local oscillator signal input module I, the filtering module I is connected with the frequency mixer II, the frequency mixer II is respectively connected with the filtering module II and the local oscillator signal input module II, and the filtering module II is connected with the radio-frequency signal output module. According to the utility model, the frequency difference between a frequency mixing spurious signal and a useful signal is increased by reasonably improving the frequency of an intermediate frequency signal, so that the purpose of filtering the frequency mixing spurious signal through the band-pass filter is achieved, and finally, a high-quality Doppler frequency shift signal is generated.

The invention provides a non-uniform double-pulse modulation method based on a TCM. The non-uniform double-pulse modulation method comprises the steps that 1, a non-uniform double-pulse period modulation model is constructed; 2, carrying out radar echo modulation analysis; 3, analyzing a pulse compression result; and step 4, regulation and control effect analysis based on a CFAR detector. According to the method, the key parameter of the time delay factor is innovatively introduced, the modulation flexibility and unpredictability are greatly improved through the collaborative design of three degrees of freedom, and the problems of insufficient flexibility and the like existing in a radar target feature regulation and control method are solved. Compared with a regulation and control method based on TCM uniform monopulse period modulation, the generated harmonic peak amplitude distribution is diversified, screening of regular signals by a radar CFAR detector is effectively avoided, and the number of effective harmonic peaks passing detection is remarkably increased. According to the invention, precise suppression or enhancement of specific-order harmonics can be realized, and a technical approach is provided for implementing flexible and dynamic radar target feature regulation and control.

The present invention relates to a method for setting a system clock of an integrated circuit (1), wherein the integrated circuit (1) has an oscillator module (2) designed to specify a system clock (100) of the integrated circuit (1), a counter module (3), a signal input (4), and a communication interface (5), wherein the method comprises the following steps: a) receiving a reference signal (100) at the signal input (4) for a predefined duration (t), b) incrementing the counter module (3) by one per system clock (100) of the integrated circuit over the duration (t) of the application of the reference signal (200), c) determining a counter value (3a) of the counter module (3) after the duration (t) has elapsed, d) receiving a counter setpoint at the communication interface (5) that corresponds to a number of system clocks during the duration (t) at a setpoint frequency,and e) comparing the counter value (3a) of the counter module (3) with the counter target value and correcting a frequency of the oscillator module (2) based on a deviation of the counter value (3a) from the counter target value.,

A wireless power system has a wireless power transmitting device and a wireless power receiving device. A clock signal may be provided to inverter circuitry in wireless power transmitting circuitry at a power transmission frequency. The clock signal may cause transistors in the inverter circuitry to turn on and off to create AC current signals through the wireless power transmitting coil. The clock signal may be processed to mitigate electromagnetic interference in the system.

A tunable device is provided. The tunable device includes a plurality of tunable units. Each of the plurality of tunable units includes a driving circuit and a frequency tunable circuit. The frequency tunable circuit includes a tunable component. The control terminal of the tunable component is coupled to the driving circuit, and the driving circuit and the frequency tunable circuit are isolated in terms of a tuned frequency of the frequency tunable circuit.

The invention relates to the technical field of piezoelectric transformers, in particular to a radial vibration piezoelectric transformer with asymmetric protruding electrodes and a preparation method of the radial vibration piezoelectric transformer. A primary side and a secondary side of the piezoelectric transformer can be formed by alternately stacking piezoelectric ceramic materials with the same or two different dielectric constants, and no isolation piece or an isolation piece is arranged between the primary side and the secondary side; the intelligent temperature control layer is arranged on the outer layer of the transformer and comprises a thermosensitive phase change material; the self-adaptive frequency regulation circuit is connected with the input end of the transformer; and the insulation heat dissipation channel structure forms an annular insulation heat dissipation gap at the edge of the ceramic single sheet. Through reasonable matching of primary and secondary structure parameters and a load relation, the piezoelectric transformer has excellent characteristics of constant current output, constant power output, same phase or pi phase difference between input voltage and input current and the like, the efficiency of the piezoelectric transformer is improved to the greatest extent, the loss of the piezoelectric transformer is reduced, and the reliability of the piezoelectric transformer is improved.

The invention relates to the technical field of signal processing, and provides a multi-channel pulse low and medium frequency signal generation system, which comprises a signal generation unit used for generating a multi-channel pulse signal, a low frequency signal and a carrier signal; the multi-channel pulse signal modulation unit is used for modulating the multi-channel pulse signal to generate a multi-channel modulation pulse signal; the power control unit is used for performing power control on the low-frequency signal and the multi-channel modulation pulse signal to generate a target low-frequency signal and a multi-channel target pulse signal; and the low and medium frequency signal modulation unit is used for synthesizing the target low frequency signal, the multi-channel target pulse signal and a carrier signal to generate a multi-channel pulse low and medium frequency signal. According to the system, through multi-channel pulse signal modulation and power control, multi-channel pulse low and medium frequency signals are accurately generated, and the flexibility and adaptability of the signals are enhanced.

A circuit includes a switching converter, an oscillator, and a spread spectrum modulator (SSM). The oscillator has a modulation input and a clock output. The clock output is coupled to the switching converter. The oscillator is configured to generate a clock signal at the clock output having a frequency based on a modulation signal at the modulation input. The SSM has a modulation output coupled to the modulation input of the oscillator. The SSM is configured to generate the modulation signal at the modulation output while adjusting a rate of change of the modulation signal based on a magnitude of the modulation signal at a boundary of a modulation time period.

The embodiment of the invention provides a dynamic frequency modulation method, a dynamic frequency modulation device, electronic equipment and a storage medium, and is used for limiting the peak current of an inductor in a boost chopper circuit, and the method comprises the steps: obtaining the peak current of the inductor in the boost chopper circuit; and dynamically adjusting a clock frequency output by a clock generation circuit in the boost chopper circuit according to the peak current, so that the peak current is within a target current range. According to the dynamic frequency modulation method provided by the embodiment of the invention, the peak current of the inductor is located in the target current range while the small-size inductor is set by dynamically adjusting the clock frequency of the boost chopper circuit, so that the boost performance of the boost chopper circuit is not influenced while the space occupation of the boost chopper circuit is reduced; the circuit area and the cost are reduced while the same boosting performance is realized.

The invention relates to a system and method for controlling a switching converter operating at pulse frequency modulation. A control unit for controlling a converter having a PFM regulated switching operation is configured to generate a square wave control signal to control switching of at least one switching element of the converter, the square wave control signal having a switching period defining a first time interval and a second time interval, the first and second time intervals are associated with respective values of the control signal, where the control unit determines a constant duration of the first time interval and a minimum duration of the second time interval in order to determine a maximum operating frequency of the converter. The control unit implements a detection stage for detecting an abnormal current event as a function of a count of a predetermined number of temporally consecutive cycles of the control signal, during which the converter operates at a minimum duration of a second time interval, and thus at a maximum operating frequency.

The utility model discloses a high-voltage sine wave generating circuit and a PFA high-voltage pulse ablation system. The high-voltage sine wave generating circuit comprises a digital control module and more than two sine wave generating modules. The sine wave generation module comprises a sine wave generation assembly which is connected with a voltage input end and is used for generating pulses and generating sine waves by using the generated pulses; the output isolation assembly is connected with the output end of the sine wave generation assembly and used for voltage isolation and sine wave output; the digital control module controls the frequency of sine waves generated by the sine wave generation assembly. The output isolation assemblies of the more than two sine wave generation modules are connected in series to superpose generated sine waves, and high-voltage sine waves are obtained. The sine wave is generated under the low input voltage, the frequency and the amplitude of the sine wave are controlled and adjusted, the requirements of the high-voltage pulse ablation system for the ablation voltage, the ablation power and the working frequency are met, and the stable and safe ablation voltage is provided for the high-voltage pulse ablation system.

The invention discloses a clock spread spectrum method, system and device, and relates to the technical field of electronic circuits, and the method comprises the steps: obtaining the frequency of an input clock, the modulation amplitude of clock spread spectrum, and the modulation frequency of clock spread spectrum; based on the frequency of the input clock and the modulation amplitude of the clock spread spectrum, calculating a target value of the frequency amplitude of a spread spectrum signal; according to the modulation frequency of the clock spread spectrum and a preset rule, generating a spread spectrum signal of which the frequency amplitude gradually changes every preset period; the preset rule is a rule determined according to a preset period and a target value of the frequency amplitude of the spread spectrum signal; the preset period is a value determined based on the frequency of the input clock; synthesizing the frequency of the input clock and the frequency of the spread spectrum signal to obtain a frequency control code; and generating an output clock after spectrum spreading according to the frequency control code. According to the invention, the lock loss of the output clock caused by sudden frequency change due to clock spread spectrum can be avoided, and the robustness of the system is improved.

The present disclosure relates to a circuit system for frequency multiplication and a signal generation circuit system, in which the circuit system includes: a first set of transistors of a first conductivity type including a first transistor and a second transistor connected in parallel; a second set of transistors of a second conductivity type including a third transistor and a fourth transistor connected in parallel, where the second conductivity type is different from the first conductivity type; wherein the first set of transistors and the second set of transistors are coupled between a first potential and a second potential different from the first potential; wherein a gate of the first transistor and a gate of the third transistor are connected and configured to receive an input signal; and wherein a gate of the second transistor and a gate of the fourth transistor are connected and configured to receive an inverted phase of the input signal.

To provide a signal output device that can improve the convenience of communication.SOLUTION: A signal output device 10 outputs a communication signal to a propagation line 30. The signal output device 10 includes a modem 11 that generates one of a first AC signal having a first frequency and a second AC signal having a second frequency as a communication signal, and an amplifier circuit 20 that amplifies the communication signal on the basis of the attenuation of the communication signal in the propagation line 30.SELECTED DRAWING: Figure 2

A circuit includes a switching converter, an oscillator, and a spread spectrum modulator (SSM). The oscillator has a modulation input and a clock output. The clock output is coupled to the switching converter. The oscillator is designed to generate a clock signal at its clock output with a frequency based on a modulation signal at its modulation input. The SSM has a modulation output that is coupled to the oscillator's modulation input. The SSM is designed to generate the modulation signal at its modulation output while adjusting the rate of change of the modulation signal based on the magnitude of the modulation signal at a boundary of a modulation period.

The invention provides a radio frequency pulse modulation method, device and equipment and a computer readable storage medium, and relates to the technical field of radio frequency. The radio frequency pulse modulation method is used for modulating a radio frequency signal into a target radio frequency pulse signal, and the waveform of the radio frequency signal is a sine wave. The radio frequency pulse modulation method comprises the following steps: modulating a radio frequency signal according to the level of an enable signal to obtain an initial radio frequency pulse signal; and in each high-level stage of the initial radio-frequency pulse signal, controlling the initial radio-frequency pulse signal to be subjected to power amplification by applying corresponding power supply voltage in a first stage and a second stage which are at least sequentially included in the high-level stages, so as to obtain a target radio-frequency pulse signal. Wherein the voltage value of the power supply voltage at any moment of the first stage is smaller than the voltage value of the power supply voltage at any moment of the second stage. According to the invention, soft start of radio frequency pulse output can be realized.

The invention discloses a random modulation clock spread spectrum device and a power chip, and the device comprises a frequency divider circuit which is used for receiving a first pulse signal outputted by an oscillator circuit in a t-1 modulation period; the M sequence generation circuit is used for generating a random digital sequence of a t-1 modulation period according to the first pulse signal; wherein the period of the random number sequence is 2n, and n is an integer greater than or equal to 4; the current bias circuit is used for generating a first bias current of a t-1 modulation period according to the random number sequence; and the oscillator circuit is used for generating a clock spread spectrum signal of a t modulation period according to the first bias current, and t is an integer greater than or equal to 2. The circuit can be widely applied to the technical field of electronic circuits.

The invention relates to a spread spectrum modulator. A circuit (400) includes a switching converter (110), an oscillator (130), and a spread spectrum modulator (SSM) (420). The oscillator (130) has a modulated input and a clock output. The clock output is coupled to the switching converter (110). The oscillator (130) is configured to generate a clock signal at the clock output having a frequency based on a modulated signal at the modulation input. The SSM (420) has a modulated output coupled to the modulated input of the oscillator. The SSM (420) is configured to generate the modulated signal at the modulation output while adjusting a rate of change of the modulated signal based on a magnitude of the modulated signal at a boundary of a modulation time period.