3832 results about "Signal production" patented technology

The invention relates to the technical field of power system automation, in particular to a real-time monitoring and fault positioning system for a vehicle-mounted mobile substation. The system comprises a signal acquisition and processing unit which monitors and acquires line parameters and environmental parameters of a transformer substation and traveling wave signals generated when a fault occurs in real time; the fault type identification unit calculates the confidence coefficient of each fault type based on the traveling wave signal so as to judge the fault type generated by the traveling wave signal, and marks the arrival time of the traveling wave head; an algorithm fusion positioning unit preliminarily positions a fault point according to the fault type and the arrival time of a traveling wave head, and then constructs a fitness function through a particle swarm optimization algorithm in combination with line topology and environmental parameters to correct a preliminary positioning error; according to the system, high-precision fault positioning and rapid isolation recovery are realized, the accuracy of fault section division in the complex power distribution network is ensured by modeling switch state and branch change, and misjudgment caused by topological change or equipment overload is effectively avoided.

The embodiment of the invention discloses a phase adjustment circuit and method and a memory. The phase adjustment circuit includes: a multi-phase clock signal generator configured to generate an initial multi-phase clock signal, a phase error detector configured to detect a phase error of the initial multi-phase clock signal, and a phase error canceller configured to cancel a phase error of the initial multi-phase clock signal; the phase error detector is connected with the multi-phase clock signal generator and is configured to perform phase error detection on the initial multi-phase clock signals to obtain error signals used for representing phase difference information among the initial multi-phase clock signals; the phase error eliminator is connected with the phase error detector and is configured to detect the error signal to obtain an error elimination code; and the multi-phase clock signal generator is also connected with the phase error eliminator and is configured to receive the error elimination code and perform phase adjustment on the initial multi-phase clock signal based on the error elimination code to obtain a target multi-phase clock signal.

The utility model provides a bootstrap voltage charging circuit applied to a switching converter. The bootstrap voltage charging circuit comprises a bootstrap capacitor, a first switching tube, a first time delay circuit, a second time delay circuit and a logic judgment unit. The second end of the bootstrap capacitor is coupled with the switch node; the first end of the first switch tube receives a charging voltage signal, the second end of the first switch tube is coupled with the first end of the bootstrap capacitor, and the control end of the first switch tube receives a charging control signal; the first end of the bootstrap capacitor generates a bootstrap voltage signal; the first time delay circuit receives the switch control signal and outputs a first time delay signal; the second time delay circuit receives the switch control signal and outputs a second time delay signal; the logic judgment unit generates a charging control signal according to the first delay signal, the switch control signal and the second delay signal. According to the utility model, the diode is replaced by the switch tube with smaller conduction voltage drop, and by controlling the switch tube, the same effect as that of the diode can be achieved, and the problem of insufficient voltage can be avoided.

The invention provides a clock signal generating circuit, a wired communication transceiver and electronic equipment, and the circuit outputs a first DC voltage comprising phase difference information and frequency difference information of a reference clock signal and a feedback clock signal through a phase frequency detection module. The pulse generator generates a narrow pulse signal based on the DC voltage and a reference clock signal, the oscillation frequency of each secondary ring oscillator in the cross-coupled ring oscillator is controlled by the first DC voltage, and the cross-coupled loop performs synchronous coupling and phase sequence adjustment processing on each secondary ring oscillator. One output node in the cross coupling ring oscillator receives the narrow pulse signal, frequency and phase locking is completed in an injection locking mode, and the frequency divider is used for conducting frequency division processing on any high-frequency clock signal and outputting a feedback clock signal. Therefore, a high-frequency multi-phase clock signal with low phase noise and high phase precision can be generated by using the low-frequency reference clock signal.

A method for performing a multiplication operation in the optical domain using an apparatus (100), the apparatus comprising: an optical waveguide (101) and a modulation element (102) optically coupled to the optical waveguide (101), the modulation element (102) modifying the transmission, reflection or absorption characteristics of the waveguide (101) according to the state of the modulation element, wherein the state of the modulation element (102) can be adjusted by a write signal (103). The method comprises: encoding a first value into the write signal (103), mapping the first value to the state of the modulation element (102) using the write signal (103); encoding a second value into a read signal (104); generating an output signal intensity of the read signal as a transmission or reflection, wherein the product of the first value and the second value is encoded in the output signal intensity.

A time-interleaved analog-to-digital converter includes a plurality of sampling circuits, a plurality of analog-to-digital converter circuits, an output circuit, and a calibration circuit. The plurality of sampling circuits are configured to sequentially sample an input signal to generate a plurality of first signals, in which a circuit parameter of each of the plurality of sampling circuits is set according to a corresponding control signal in a plurality of control signals. The plurality of analog-to-digital converter circuits are configured to generate a plurality of first digital codes according to the plurality of first signals. The output circuit is configured to output a second digital code according to the plurality of first digital codes. The calibration circuit is configured to generate the plurality of control signals and adjust the plurality of control signals according to the second digital code.

The invention discloses a self-calibration high-resolution PWM (Pulse Width Modulation) signal generating circuit, which belongs to the field of electronic circuits and comprises a PWM signal generating module, a high-resolution module, a calibration module, a register module and an AHB (Advanced High-performance Bus) interface. The PWM signal generation module generates a coarse adjustment PWM signal based on a comparison result of the comparison register and the counter; and the high-resolution module performs fine edge positioning on the coarse adjustment PWM wave to generate a fine adjustment PWM signal. Under the condition that the clock frequency is not changed, the high-resolution module can improve the resolution of the PWM signal. The calibration module has a high-resolution calibration function, and the high-resolution calibration function can avoid the deviation of a delay value caused by the environment and ensure the accuracy and stability of the high-resolution PWM. The register module is responsible for register read-write control. The AHB bus interface part is responsible for processing bus interface signals. The self-calibration high-resolution PWM signal generation circuit has the advantages of being high in precision, high in stability, easy to IP and the like.

The invention discloses a frequency hopping carrier signal detection method, system and device based on time-frequency analysis and a storable medium, and belongs to the technical field of frequency hopping carrier signal detection. According to the detection method, firstly, a sampling signal is subjected to combined time-frequency analysis transformation (STFTamp; according to the method, a to-be-detected time-frequency graph is obtained through a WVD method, structural elements of different scales are constructed through self-adaptive morphological filtering to process the time-frequency graph, noise and burst signals are removed, influences on to-be-detected frequency hopping signals are avoided, and the detection accuracy is improved. And then, aiming at the residual fixed-frequency signal and sweep-frequency signal interference, Hough transform is used for carrying out feature extraction on a straight line, and a frequency hopping signal is judged according to different time-frequency features of different signals, so that the detection process of the frequency hopping signal is completed. The detection method can be applied to a wireless sensor network and is used for realizing data communication and information transmission between sensor nodes. Through detection and analysis of the frequency hopping signal, the communication stability and reliability of the sensing network in a complex electromagnetic environment can be effectively improved.

Disclosed are a synchronous rectification control circuit, a synchronous rectification control method and a switching power supply, the synchronous rectification control circuit comprising: a volt-second setting unit for processing a volt-second product reference value into at least any two of a first volt-second product threshold to a third volt-second product threshold; the first control driving unit is used for sending a first conduction signal to conduct the synchronous rectifier tube and controlling the pulse width of the first conduction signal according to a first volt-second product threshold value; the second control driving unit is used for calculating a first volt-second product of voltages at two ends of the secondary winding within first time after the first conduction signal is generated, and controlling the synchronous rectifier tube to be conducted for follow current after the first volt-second product is greater than a second volt-second product threshold value; and the voltage judgment unit is used for calculating a second volt-second product of voltages at two ends of the secondary winding within a second time after the first conduction signal is generated, and judging the state of the input voltage according to the second volt-second product and a third volt-second product threshold value. Through the arrangement, the volt-second setting pin of the synchronous rectification control circuit can be reused to execute various functions.

A system and method for therapeutic electrical stimulation of a wrist. A flexible band is secured around the wrist. The flexible band supports an electrode carrier, including a set of electrodes, one of which is in physical contact with a dorsal side of the wrist and a second of which is in physical contact with a ventral side of the wrist. A stimulation module is in electrical communication with the electrode carrier and includes signal generation circuitry that generates an electrical stimulation signal as a direct current pulse at a frequency between 10 kHz and 50 kHz. Control circuitry sequentially activates different subsets of electrodes to act as a signal source or a signal sink for the electrical stimulation signal. The electrodes are configured to deliver electrical stimuli to the arm or wrist for exciting a median, radial or ulnar nerve.

The invention discloses an ultra-low phase noise microwave signal generation method and system based on an electro-optical comb. The method comprises the following steps: 1) locking two lasers with continuously tunable wavelengths in the same FP cavity through two links with different modulation frequencies to realize a dual-wavelength laser with a frequency interval of (v2-v1); 2) reducing the electronic noise of each link to a quantum noise limit by using a residual amplitude modulation noise control technology; 3) coupling the lasers with the center frequencies of v1 and v2 into one path, inputting the laser into an electro-optical frequency comb generator, and generating two sets of electro-optical frequency combs with spectrum overlapping; (4) beat frequency signals of the two electro-optical frequency combs are obtained; the beat frequency signal and a reference signal from a reference signal source are accessed to a phase discriminator for phase discrimination; an output signal of the phase discriminator is sent to a proportional-integral-differential control circuit; and 5) controlling the phase noise of the radio frequency source by using the output feedback of the proportional-integral-differential control circuit to obtain an ultra-low phase noise microwave signal.

The invention provides an array substrate and a display device, and the array substrate comprises a substrate; the gate insulating layer is arranged on the substrate; the data line is arranged on the gate insulating layer; the first passivation layer is arranged on the gate insulation layer and covers the data line; the first shielding electrode is arranged on the first passivation layer, and the first shielding electrode is connected with the direct-current voltage signal output end; the second passivation layer is arranged on the first passivation layer and covers the first shielding electrode; the common electrode is arranged on the second passivation layer, and a part of the common electrode is overlapped with the data line and the first shielding electrode; the pixel electrode and the common electrode are arranged on the same layer or stacked, and the pixel electrode is insulated from the common electrode. The first shielding electrode is connected to the direct-current voltage signal, so that the data voltage signal on the data line does not affect the signal on the common electrode, coupling capacitance between the common electrode and the data line is avoided, and poor display of picture flicker is avoided.

The present invention relates to the field of mixed-signal compute-in-memory, and relates to a storage computing unit, comprising a 1-bit multiplication unit, a capacitor, an accumulation bus, and a control line, and further comprising a differential capacitor and a differential accumulation bus. The storage computing unit makes the use of an approximation standard 6T SRAM storage unit possible, thereby improving the energy efficiency, computing area efficiency, and storage density. Further provided are a storage computing array comprising a plurality of storage computing units and a plurality of 1-bit SAR logic units, a storage computing macro module comprising the storage computing array and a plurality of comparators, and a storage computing upper-level macro module comprising the storage computing macro module and a plurality of dynamic comparator clock generating units. According to the storage computing array and corresponding SAR logic units and dynamic comparator clock generating units of the present invention, the wiring is simplified, the interconnection parasitics are reduced, the energy efficiency is improved, and the number of metal layers for interconnection is reduced, thereby reducing costs.

The utility model relates to a phase interpolator circuit, a clock recovery circuit and a chip, and the phase interpolator circuit mainly comprises a first clock filter which is used for filtering a high-frequency harmonic wave of a first clock signal to generate a first filtering signal; the second clock filter is used for filtering the high-frequency harmonic wave of the second clock signal to generate a second filtering signal; the phase mixer is coupled to the first clock filter and the second clock filter and is used for generating a phase mixed signal according to the first filtering signal and the second filtering signal; and the alternating current coupling output circuit is used for receiving the phase mixed signal and generating an interpolation clock signal according to the phase mixed signal. The phase interpolator circuit can support phase interpolation operation in a wide frequency range, the output linearity performance is optimized, the sensitivity of INL and DNL to power supply amplitude changes is weakened, the duty ratio of the output interpolation clock signal can be optimized, and the interpolation clock signal can support a high-speed interface half-rate transmission mode.

A radar based, fill level measuring device for determining fill levels in containers, wherein the fill level measuring device can be applied for a large number of different applications, includes a signal production unit designed to produce a first transmitted radar signals within a first frequency band and supplementally a second transmitted radar signal within a second frequency band that does not overlap with the first frequency band and is clearly separated therefrom. The evaluation unit of the fill level measuring device can determine a first fill level value based on the first received signal. Based on the second received signal potentially another fill level value can be determined. In this way, the fill level measuring device can be adapted as regards frequency band to the particular application. The ascertained fill level can be checked for plausibility by comparing the fill level values ascertained in different frequency bands.

The invention relates to a phase-locked loop circuit, a clock generator, a chip and electronic equipment, and the phase-locked loop circuit mainly comprises a phase frequency detector which is used for generating a phase detection output signal according to the phase of a reference clock signal and the phase of a feedback clock signal; the proportional path module is used for generating a first control current according to the phase discrimination output signal; the integral path module is used for generating a second control current according to the phase discrimination output signal; the current control oscillation module is used for generating a clock output signal according to the first control current and the second control current; and the feedback frequency divider is used for obtaining a feedback clock signal through frequency division of the clock output signal. According to the phase-locked loop, the advantages of the analog charge pump phase-locked loop and the full-digital phase-locked loop are combined, the generation of a high-performance clock which is small in area, high in bandwidth, stable in loop and low in quantization noise is facilitated, the applicability of the phase-locked loop to the high bandwidth requirement is facilitated, the quantization noise is reduced, and the performance of the phase-locked loop is improved. And unconditional stability of the phase-locked loop is realized theoretically.

The invention discloses a nonlinear ultrasonic guided wave detection system based on multi-channel receiving, and the system comprises a high-energy fundamental frequency ultrasonic excitation module which is controlled by a trigger signal to generate an electric signal and carries out the amplification and filtering processing; the transmitting transducer generates ultrasonic waves to act on a target object under the excitation of the high-energy fundamental frequency ultrasonic excitation module; the variable-angle receiving transducer array is used for receiving the ultrasonic guided wave signal fed back by the target object and converting the ultrasonic guided wave signal into a feedback electric signal; the ultrasonic acquisition module is used for amplifying the feedback electric signal, sampling the feedback electric signal and converting the feedback electric signal into a digital signal under the instruction of the control and signal processing module; the control and signal processing module comprises an FPGA (Field Programmable Gate Array) chip and an ARM (Advanced RISC Machines) main processor, and is used for controlling the generation of an instruction and performing time domain-frequency domain-space domain information extraction on the digital signal sent by the ultrasonic acquisition module, and calculating to obtain a material nonlinear parameter carried by the guided wave signal; and performing micro-damage evaluation and life prediction based on the nonlinear parameters of the material.

According to the driving control circuit for the electrostatic chuck power supply and the electrostatic chuck power supply, the driving control circuit is arranged in the electrostatic chuck power supply, a high-voltage output voltage signal of a high-voltage amplifying circuit can be obtained through a signal generating and processing feedback circuit, and according to a negative feedback adjusting mechanism, the driving control circuit is used for driving the electrostatic chuck power supply. A power supply waveform control signal for controlling a high-voltage amplification circuit to output a high-voltage output voltage signal is adjusted, and the high-voltage output voltage signal output by the high-voltage amplification circuit is adjusted to be output, so that the effect of controlling the signal precision of the high-voltage output voltage signal output by the electrostatic chuck power supply is achieved, and the output stability of the electrostatic chuck power supply is improved. Therefore, the stability of an electrostatic field generated by the electrostatic chuck is guaranteed, and the wafer fixing process precision of the electrostatic chuck is ensured.

The invention discloses a chip reference voltage trimming circuit which is characterized in that when an enable signal is in a high level, a low enable discharge module is turned off, and an adjustable buffer unit generates a preset voltage according to an external reference voltage and a voltage regulating signal; the generated preset voltage generates a reference voltage after passing through a low-pass filtering network consisting of a fast charging path, a slow charging path and a filtering capacitor; the abnormal state detection unit is used for detecting the abnormity of the trimming circuit, if abnormity exists, the output signal of the abnormal state detection unit is high level, the output signal of the quick charging control unit is controlled to be low level, the quick charging access is opened, and the opening time of the quick charging access is controlled through the quick charging control unit; and a following speed trimming signal is input to the fast charging control unit, and the generated reference voltage is trimmed to be the same as the preset voltage. The performance of the reference voltage of the chip is adjusted through the trimming signal, and the performance requirements of equipment in different working states can be met.

A self-adaptive high-dynamic spread spectrum tracking receiver relates to the technical field of satellite communication and comprises an AGC loop, an A / D converter, a PN code capturing and tracking loop, a single carrier loop, a despreading device, a phase discriminator, a phase shift signal generator and a low-pass processor. The method comprises the following steps of: converting a signal into a digital signal, subsequently generating an output tracking signal through a PN code capturing and tracking loop, processing through a single carrier loop to obtain a captured tracking signal and an amplitude excitation signal, and finally carrying out de-spreading and phase discrimination to generate an azimuth error voltage signal and a pitching error voltage signal; the receiver can stably receive and process spread spectrum signals sent by a high-speed target.

The invention provides a radio frequency front end module. The circuit comprises a first matching circuit, a first-stage power amplification circuit, a coupler, a first radio frequency switch, a radio frequency main path, an attenuation path, a second radio frequency switch, a second matching circuit, a second-stage power amplification circuit, a third matching circuit, a power detection circuit, a low-pass filter, a first operational amplifier and a hysteresis comparator. The hysteresis comparator is used for controlling the input end of the first radio frequency switch to be communicated with the first output end of the first radio frequency switch or the second output end of the first radio frequency switch; and meanwhile, the control circuit is used for controlling the first input end of the second radio frequency switch or the second input end of the second radio frequency switch to be communicated with the output end of the second radio frequency switch. According to the radio frequency front-end module, on the premise that the power amplification circuit is not damaged, normal output of the radio frequency signal can be ensured, and meanwhile the situation that a post-stage output signal is distorted due to reduction of the bias voltage is avoided.

A chip-scale mode-locked laser including a cavity including a gain medium for amplifying signal electromagnetic radiation (signal) through stimulated emission, the signal comprising a signal wavelength; and a passive or active mode-locking device to enforce pulse formation in the laser. The mode-locking device includes a thin-film waveguide having a thickness on the order of the signal wavelength so as to confine and guide the signal along the thin-film waveguide, and a material comprising a second-order nonlinear susceptibility to enable active or passive mode-locking of the signal. The mode-locking device leads to generation of pulses of the signal outputted from the mode-locked laser.

The invention relates to the field of pulse signal generation, and discloses an integer frequency signal generation circuit and method for a microprocessor, and the circuit comprises a flipping register, a frequency division register, a counter, a frequency signal flipping module, an integer frequency calculation unit, and a time delay unit. The integer frequency calculation unit is used for calculating the delay series of the fractional part of the frequency division value when the enable signal 1 is valid, and sending the delay series to the delay unit; and the delay unit is used for carrying out delay less than one clock period on the frequency signal output by the frequency signal overturning module according to the delay series sent by the integer frequency calculation unit, and outputting an integer frequency signal. According to the integer frequency signal output circuit disclosed by the invention, the frequency division value and the delay series of the frequency division register are automatically changed through the integer calculation module and the delay series calculation module, and the delay series controls the one-out-of-256 selector to be used for selecting the frequency signal output of the corresponding delay module in the delay unit, so that the generation of the integer frequency signal is realized.

The present invention relates to an on-board redundant controller and standby aviation sensors in-flight reconfigurable autonomous flight system, which includes UAV, primary autopilot module, secondary autopilot module and switching module. The primary autopilot module and secondary autopilot module are equipped with first aviation sensing module and second aviation sensing module. The primary autopilot module produces response signal according to the request signal produced by the secondary autopilot module. When the first response signal is no longer produced by the primary autopilot module for a preset time, the first switching module switches controls of the flight control module from the primary autopilot module to the secondary autopilot module, and the secondary autopilot module uses the aviation data of the second aviation sensing module to provide flight control signals to the flight control module.

The invention relates to the field of semiconductor circuit design, in particular to a memory and a memory system, the memory comprising: n memory blocks, n being a positive integer; the activation control circuit is configured to receive the address signal and the activation signal, count the activation signal corresponding to each storage block based on the address signal, and generate and output a row hammer refreshing indication signal corresponding to the storage block when the number of the activation signal corresponding to any storage block meets an activation preset value; wherein the address signal indicates the memory block which is currently subjected to the activation operation; the row hammer refresh control circuit is coupled with the activation control circuit and is configured to receive a refresh signal and a row hammer refresh indication signal, and generate a target storage block row hammer refresh signal corresponding to the storage block based on the refresh signal and the row hammer refresh indication signal, the target storage block row hammer refresh signal is used for indicating the corresponding storage block to execute a row hammer refresh operation so as to reduce the power consumption of the memory.

An optical system (200) comprising: an optical element (N5); a sensor unit (202) configured to generate a position measurement signal (y) depending on the position of the optical element (N5). k ) to output; a controller unit configured to output a value depending on the position measurement signal (y) k ) to generate a controller control signal; a disturbance estimator unit configured to measure a periodic, externally excited disturbance (d k ) for a next time step, and based on this, a position of the optical element (N1 - N6) in the next time step as a function of the position measurement signal (y) k ) and a control signal (u k ) to estimate and, depending on the estimated position for the next time step, to output a pre-control position correction signal; an adding unit configured to combine the control signal (u k) by summing the controller control signal and the feedforward control correction signal; an actuator (208) configured to control the optical element (N5) depending on the control signal (u k ) to head towards.

The invention discloses a gas concentration detection circuit and method based on differential measurement and reference compensation, and the circuit comprises at least one active gas sensitive element, the electrical parameters of which change along with the concentration of a target gas; the sensitivity of the reference gas sensitive element to the target gas is at least lower than that of the active gas sensitive element by a preset percentage threshold value; the active gas sensitive element and the reference gas sensitive element are connected in a differential pair form to form a differential signal generation unit; the differential amplification circuit is used for amplifying the differential signal output by the differential signal generation unit; the output signal of the differential amplification circuit is used for representing the concentration information of the target gas. According to the invention, environmental interference and baseline drift are directly and effectively suppressed from the hardware level, the stability and selectivity of gas concentration measurement are improved, and meanwhile, the holding circuit is simple in structure, low in cost and convenient for large-scale application.

A driving circuit, a driving method, a driving module and a display device are provided. The driving circuit includes a driving signal generation circuit, a gating circuit, an output control circuit, an output circuit, a voltage control circuit and a third control node control circuit. The third control node control circuit is electrically connected to the first node and the third control node respectively, and is configured to control the potential of the third control node according to the potential of the first node.

The invention relates to the technical field of medical equipment, and provides a focused ultrasound system with multiple treatment modes. The drive circuit comprises a signal generation module which outputs a first ultrasonic generation signal suitable for a thermal ablation mode or a second ultrasonic generation signal suitable for a histotripsy mode; the energy amplification module comprises a signal end, a power supply end and an output end coupled with the ultrasonic transducer; the energy amplification module comprises an isolation driving circuit which outputs a first switch driving signal and a second switch driving signal which are opposite based on an input ultrasonic generation signal; and the power amplification circuit comprises a second switch unit and a first switch unit which are set to be in opposite switch states by opposite driving signals so as to output ultrasonic driving signals to excite the ultrasonic transducer to form focused ultrasound in a histotripsy mode or a thermal ablation mode. The driving circuit is simple in structure and easy to realize, and can meet power supply requirements of various modes such as thermal ablation, histotripsy and the like.

The invention relates to the technical field of wireless communication, in particular to an OTA upgrading method and system for Bluetooth sound equipment. The method comprises the following steps: acquiring to-be-upgraded firmware data and currently played audio data, and acquiring power amplifier current feedback data of a sound speaker by sending a double-frequency detection signal containing 21kHz and 22kHz; acquiring equipment transmission capability confirmation data according to a silent response mode of the sound equipment to the preset handshake signal; and calculating a nonlinear distortion coefficient of the loudspeaker according to the intensity of the 1kHz difference frequency component in the power amplifier current feedback data, and obtaining real-time channel evaluation data based on current waveform deviation analysis. According to the method, the nonlinear distortion degree of the loudspeaker is accurately evaluated through the 1kHz difference frequency component generated by the 21kHz and 22kHz dual-frequency detection signals, so that the reliability of data transmission is more accurately predicted.