66 results about "Voltage noise" patented technology

A low dropout regulator includes output terminal circuit and amplifier. The output terminal circuit is configured to generate output voltage according to input voltage and is configured to generate feedback voltage according to the output voltage. The amplifier is configured to generate control voltage to the output terminal circuit according to reference voltage and the feedback voltage, so as to adjust the output voltage, wherein the amplifier includes input stage circuit, current mirror circuit and filter circuit. The input stage circuit is configured to receive the reference voltage and the feedback voltage to generate a differential output. The filter circuit is configured to filter the input voltage to generate dependent current related to noise of the input voltage on the current mirror circuit, wherein the current mirror circuit is configured to output the control voltage according to the differential output and the dependent current.

According to the synchronous programmable two-way current source relative deviation calibration device and method, the influence of the thermal effect of the sampling resistor on relative deviation data is avoided through specific connection among the two-way synchronous current source, the programmable resistor module and the sampling resistor. The programmable resistor module is used, and the influence of voltage noise output by the current source on relative deviation data is reduced. According to the invention, the upper computer controls the double-throw switch to act and sends the corresponding response code value to the corresponding synchronous current source for output, so that the relative deviation signal data of the two-way synchronous current source under all output current gears is obtained. Relative deviation signal compensation is carried out on the reference current source, the problem that the deviation of current responding to the same code value is too large under the combined action of the difference value of reference voltage values of two synchronous current sources, the error of a transconductance amplifier and the nonlinear difference of a DAC chip is solved, and then the problem that a superconducting quantum interference device loses lock in a CCC system is solved.

The embodiment of the invention provides a multi-lead wireless wearable myoelectricity acquisition system, and belongs to the crossing field of biomedical engineering and electronic technology. The electromyographic acquisition system comprises an electromyographic electrode pair module used for acquiring electromyographic signals and sending the electromyographic signals to an active circuit module; the active circuit module is used for processing the received electromyographic signals so as to improve the anti-interference capability and the acquisition accuracy, and sending the processed electromyographic acquisition input signals to the electromyographic acquisition module; due to the special design of the active circuit module, the active circuit module has the characteristics of ultrahigh input impedance, low voltage noise, bias current and the like, noise interference of electromagnetism, environment, motion and the like can be effectively resisted, meanwhile, power frequency interference is further reduced by processing common-mode signals through the auxiliary driving module, the stability and reliability of electromyographic signal acquisition in a complex environment are ensured, and the electromyographic signal acquisition efficiency is improved. And signals can be accurately acquired in sports venues or places with dense electronic equipment.

Aspects presented herein relate to methods and devices for graphics processing including an apparatus, e.g., a GPU. The apparatus may obtain an indication of a set of graphics instructions. The apparatus may also determine whether each graphics instruction in the set of graphics instructions is associated with a resonance frequency that is above or below a threshold. Further, the apparatus may adjust an activity level for each graphics instruction in the set of graphics instructions based on the resonance frequency being above or below the threshold.

The present disclosure provides an operational amplifier current noise testing device and method, relates to the technical field of operational amplifier noise testing, aims to find the position of the introduced pole by testing the input end capacitor, and compensate the influence of the introduced pole of the sampling resistance and stray capacitor through the mathematical correction method, so as to accurately measure the current noise characteristics of the operational amplifier. The device comprises: a device under test module comprising an operational amplifier to be tested and a sampling resistor, wherein the sampling resistor is used to convert the current noise at the input end of the operational amplifier into voltage noise; an auxiliary amplifier module for further amplifying the voltage noise; a capacitor testing module for testing the total input capacitance of the device under test module, the total input capacitance comprising the input capacitance of the operational amplifier itself and the stray capacitance introduced by the system; wherein after the total input capacitance is obtained, the attenuation frequency of the noise signal is corrected according to the total input capacitance to obtain the corrected noise signal.

The present invention discloses a high-temperature superconducting quantum voltage noise thermometer, comprising a detector resistor, a high-temperature superconducting quantum voltage pseudo-noise source, a switch conversion circuit, two-way amplification and filtering circuits, and a data acquisition and processing circuit; the input end of the switch conversion circuit is electrically connected to the output end of the detector resistor and the high-temperature superconducting quantum voltage pseudo-noise source respectively, and the output end is electrically connected to the amplification and filtering circuit and the data acquisition and processing circuit in sequence; the data acquisition and processing circuit comprises two analog-to-digital converters and a cross-correlation data processing circuit, and the input end of each analog-to-digital converter is electrically connected to the output end of one amplification and filtering circuit. The present invention adopts a high-temperature superconducting quantum voltage noise source device based on a pulse-driven high-temperature superconducting Josephson array as a reference noise source, can work in a liquid nitrogen temperature zone, has low refrigeration cost, small size, short refrigeration time and low power consumption, and can realize temperature in-situ calibration under special environments.

The present application relates to the field of integrated circuits and photoelectric detection technology, in particular to a low-noise hybrid domain CMOS detector readout circuit.The circuit includes a capacitance feedback transimpedance amplification unit, a switched capacitor reference unit, an analog domain readout unit, a time domain quantization unit and an output selection unit.The transimpedance amplification unit converts the pixel current into voltage.The switched capacitor reference unit filters out the reference voltage noise in the reset stage and maintains the reference potential in the integration stage.The analog domain readout unit outputs analog voltage, and the time domain quantization unit outputs digital time code through saturation time detection.The output selection unit defaults to output analog signal, and switches to digital output when the transimpedance amplifier output voltage reaches the preset threshold.The present application also provides a corresponding readout method.The present application can effectively filter out the reference voltage source noise and power supply ripple, significantly improve the signal-to-noise ratio of micro-light detection, realize high dynamic range in a single frame, significantly expand the linear response range of the detector, and can be integrated on chip.

Systems and methods are disclosed that monitor for supply noise from a power source using a voltage noise monitor (VNM). For instance, the VNM may include voltage sense circuitry comprising a controllable resistor that is controlled using threshold information. The resistance of the controllable resistor may be changed based on closing and / or opening one or more switches associated with step resistors using the bits from the threshold information. Furthermore, the VNM may include digital circuitry that comprises a hold finite state machine and a sticky hold counter. Using the digital circuitry, the VNM may be configured to hold a noise detection event for a plurality of clock cycles. In addition, the VNM may perform a calibration process based on setting two voltages for the power source to obtain two codes, and determining a transfer function based on the two voltages and the two codes.

The application provides a chip power consumption attack detection method and system based on voltage comparison, and a chip. The method comprises the following steps: deploying an analog voltage comparator between power grid nodes of an integrated circuit, and using the analog voltage comparator to compare voltages between the power grid nodes in real time to detect voltage changes caused by power consumption analysis attacks; extracting features of the power grid nodes based on voltage comparison results, and training the extracted features using a linear support vector machine model to obtain a trained machine learning model; and finally embedding the trained machine learning model into the integrated circuit for power consumption analysis attack detection. The application detects voltage differences between adjacent power grid nodes through the analog voltage comparator, and compensates for the influence of voltage noise through multiple voltage comparisons; the linear support vector machine model is selected as the power consumption analysis attack detection model, which can detect power consumption analysis attacks in real time and ensure the security of the hardware system.

The utility model relates to a power supply management module which comprises a power supply, a DC-DC voltage reduction chip, a first linear voltage stabilization chip, a second linear voltage stabilization chip, a multipath linear voltage stabilization chip and a voltage reference chip, the output of the power supply is connected with the input of the DC-DC voltage reduction chip, the output of the DC-DC voltage reduction chip is divided into two paths, one path is connected with the input of the first linear voltage-stabilizing chip, one path is connected with the input of the second linear voltage-stabilizing chip, the output of the first linear voltage-stabilizing chip is connected with the digital synthesizer, the output of the second linear voltage-stabilizing chip is divided into three paths, one path is connected with the radio frequency detector, the other path is connected with the input of the multi-path linear voltage-stabilizing chip, and the third path is connected with the input of the voltage reference chip. The output of the multipath linear voltage stabilization chip is divided into multiple paths to be connected with the main control chip, and the output of the voltage reference chip is connected with the analog-to-digital sampling chip. The power supply management module is low in voltage reduction power consumption, low in ripple voltage, low in voltage noise and stable in power supply, so that normal work of the power equipment state monitoring device is ensured.

The present invention provides a current conditioning method and circuit, a power conversion circuit, and electrical equipment. The current conditioning method first merges, stores, and outputs noise and current signals obtained by conversion sampling, and then synthesizes low-energy secondary voltage noise of different time sequences and a high-energy primary current signal reflecting the switching timing of the inverter into a single monotonic single-value boost signal in which the primary current signal plays a dominant role in timing and intensity and can reflect the magnitude of the primary current of the current transformer. At the same time, when the output voltage rises to a second preset voltage, discharge and voltage stabilization processing are performed, so that the output voltage returns to a monotonic single-value step-down signal with a constant negative value within at most half a PWM cycle, thereby forming a noise-free triangular wave voltage signal that is proportional to the magnitude of the primary current of the current transformer and has the same frequency and phase as the primary current of the current transformer, thereby improving the reliability of inverter control, avoiding false triggering and false protection, and ensuring the safety and normal operation of the inverter.

The application discloses a method and device for arranging attenuators in a read input link and a storage medium, comprising: determining a total attenuation value required by the read input link according to a first thermal noise photon number of a read signal transmitted from a room temperature environment to a read cavity of a quantum chip along the read input link and a second thermal noise photon number of the read cavity when normally working; arranging at least one attenuator in a higher temperature zone and a lowest temperature zone of a refrigerator according to the total attenuation value; determining a total voltage noise power spectral density of all temperature zones according to attenuation values, numbers and temperature zones of the attenuators; determining an equivalent temperature of the read cavity according to the total voltage noise power spectral density; and judging whether the equivalent temperature is lower than a threshold value, if yes, the arrangement of the attenuators is reasonable, and if not, adjusting the number and / or attenuation value of the attenuators until the equivalent temperature is lower than the threshold value. The method can accurately select an arrangement of the attenuators whose thermal noise meets the normal working of the quantum chip.

An electronic device according to an embodiment may comprise a port configured to receive an alternating current signal. The electronic device may comprise a transistor disposed on a power path extending from the port and configured to control transmission of the alternate current signal. The electronic device may comprise a control circuit configured to generate a control signal to be transmitted to the transistor by using the alternating current signal. The electronic device may comprise a diode connected to a signal path between the control circuit and the transistor and configured to maintain the voltage of the control signal at or below a threshold voltage.

The present invention provides a method, device, equipment, and medium for testing electrochemical impedance spectroscopy of new energy batteries, and relates to the technical field of electrochemical impedance spectroscopy of new energy batteries. The method comprises: using a preset generalized S transform to process a one-dimensional time-series signal of output voltage and a one-dimensional time-series signal of output current to obtain a two-dimensional time-frequency matrix of output voltage and a two-dimensional time-frequency matrix of output current; determining a target frequency response function estimation method based on the minimum value of the average current noise level and the average voltage noise level; when it is determined that the noise comes from voltage, calculating a weight matrix based on the energy of the measured current signal to obtain a target impedance value; when it is determined that the noise comes from current, calculating a weight matrix based on the energy of the measured voltage signal to obtain a target impedance value. The energy-weighted frequency response function estimation technology of the present invention extracts effective harmonic information from the two-dimensional time-frequency matrix, and accurately obtains the electrochemical impedance spectrum by giving priority to the more contributing frequency components.

The present application discloses a filter driving circuit, a YIG filtering device and a tuning method, wherein the filter driving circuit includes an adjustable filtering circuit and a voltage / current conversion circuit. The adjustable filtering circuit is used to filter a preset driving control signal according to a preset filtering parameter, and output the first driving control signal obtained after filtering to the voltage / current conversion circuit, wherein the filtering parameter is related to the tuning rate of the YIG filter. The voltage / current conversion circuit is used to output a control voltage signal according to the first driving control signal, so as to adjust the driving current signal of the YIG filter through the control voltage signal. Since the tuning parameter of the driving control signal is set according to the tuning rate when the YIG filter is working, the control voltage noise of the driving control signal is filtered out in a targeted manner, so that the YIG filter can achieve the best additional phase noise while having a faster tuning rate.

The utility model discloses an LDO circuit, LDO and power supply system relates to power supply management technical field, the LDO circuit includes: LDO main body circuit, including first input terminal, second input terminal, output terminal and ground terminal, the first input terminal is used for receiving reference voltage, the second input terminal is connected with power supply, the output terminal is connected with load, the ground terminal is used for ground connection, the ground terminal is used for ground connection. The voltage processing module is used for processing an input voltage input by an input end of the voltage processing module according to a reference voltage to obtain a constant output voltage and outputting the output voltage through an output end of the voltage processing module; the input end of the noise optimization circuit is connected with the input end of the LDO main body circuit, the grounding end of the noise optimization circuit is grounded, and the noise optimization circuit is used for filtering differential-mode noise and common-mode noise accessed to the input end of the LDO main body circuit; according to the technical scheme provided by the utility model, the noise optimization capability in the LDO circuit can be effectively improved.

The embodiment of the invention provides a constant voltage generation circuit, and relates to the technical field of circuit constant voltage. In the constant voltage generation circuit, the input end of a high-voltage domain module is used for being connected with an input power supply, and the voltage of the output end of the high-voltage domain module is the output voltage of the constant voltage generation circuit. The low-voltage domain module is used for adjusting operation of the high-voltage domain module. When the voltage is too high, the low-voltage domain module slowly turns off the MOS tube of the high-voltage domain in a current extraction mode, and compared with the mode that a voltage comparator is arranged to turn off the MOS tube in a switch switching mode, voltage noise generated by slow turn-off in the mode is low.

The present invention provides a measuring device and method that can reliably remove high-frequency, high-voltage noise at the start of arc welding and measure the voltage. [Solution] The measuring device is applied to arc welding using a welding machine. The measuring device comprises a measuring instrument for measuring the voltage of the welding machine, a detector for acquiring information to detect the generation and extinction of arc light, an insulating circuit that can be controlled to either an insulating state that insulates the welding machine and the measuring instrument, or an energized state that conducts electricity between the welding machine and the measuring instrument, and an insulating circuit control unit that detects either the generation or extinction of arc light based on the information acquired by the detector, and controls the insulating circuit to either an insulating state or an energized state according to the detected generation or extinction of arc light.

The invention relates to the technical field of lasers, in particular to a line width adjustable distributed feedback fiber laser, which is characterized in that a phase shift grating and piezoelectric ceramics are mechanically coupled, and a signal generator is configured to output a voltage noise signal with adjustable amplitude or bandwidth to the piezoelectric ceramics so as to apply dynamic strain to the phase shift grating in the working process of laser, so that the phase shift grating can be subjected to dynamic strain; and the effective refractive index or pitch of the phase shift grating is changed, so that the line width of the output laser is broadened, and the controllable adjustment of the line width is realized. By applying a voltage noise signal to the piezoelectric ceramic, a dynamic pulling force can be applied to a phase-shift grating in the distributed feedback fiber laser to realize laser line width broadening of the distributed feedback fiber laser; the line width of the distributed feedback fiber laser can be controlled by applying voltage noise signals with different voltage amplitudes or different bandwidths to the piezoelectric ceramics.

A low-input-voltage, negative-output, ultra-low-noise linear regulator, relating to integrated circuit technology, comprises a reference circuit, an error amplifier, and a drive circuit. The output of the drive circuit is connected to the gate of a power transistor. The drive circuit has a positive input and a negative input, and the output of the error amplifier is connected to the negative input of the drive circuit. This invention significantly reduces the output noise of the linear regulator. Furthermore, the linear regulator generates a negative output, providing a negative voltage source for the load. The high-gain drive circuit suppresses input voltage noise, extending the input voltage range.

The invention discloses a low-noise LDO (Low Dropout Regulator) circuit which comprises a band-gap reference circuit, reverse biased diodes in triodes are connected in series, the output reference voltage of the band-gap reference circuit is improved, a low-noise band-gap reference circuit structure capable of outputting high voltage is adopted, the amplification factor of reference voltage noise to an output end is reduced, and the output voltage is improved. And meanwhile, under the condition that a filter capacitor is not adopted, full-band low-noise output is realized.

The invention discloses a hidden channel physical attack method based on GPU (Graphics Processing Unit) voltage noise, relates to the field of hidden channel attacks, and solves the problem that hidden channel attacks cannot be realized through physical signals in the prior art. Executing a voltage noise pulse sequence synchronously generated by the grid-level cooperative group through the GPU, and encoding the privacy data into a voltage noise sequence; and the receiver monitors the voltage noise sequence of the sender in real time through data acquisition equipment, and decodes the acquired voltage noise sequence to obtain original data. According to the method, the voltage noise generated when the GPU executes specific operation is used as a data transmission medium, data leakage can be realized in a physical isolation system, and a new view angle is provided for safety research and prevention.

To provide a semiconductor device comprising a switching regulator capable of reducing a voltage noise generated at an output node OUT when transitioning from a Hi-Z state to a lowest frequency operation.SOLUTION: A first control circuit 4 generates a first control signal LGCTL in response to a rise of a feedback voltage FB or assertion of a MINF state signal SMINF. A second control circuit 5 generates a second control signal LGCTLD by which the first control signal LGCTL is delayed, and a third control signal LGDVB thereof. The third control signal LGDVB performs same operation as an inverted signal of the second control signal LGCTLD when the MINF state signal SMINF is negated, and is negated when he MINF state signal SMINF is asserted. A low potential side pre-driver 6 outputs a driving signal LG in response to the second control signal LGCTLD and the third control signal LGDVB, and reduces a slew rate of the driving signal LG when the third control signal LGDVB is negated.SELECTED DRAWING: Figure 1

In an example, a CAN transceiver includes a first transistor having a control terminal, having a drain coupled to a voltage supply terminal, and having a source. The CAN transceiver includes a second transistor having a drain coupled to a control terminal of the first transistor, a source coupled to the source of the first transistor, and a control terminal. The CAN transceiver includes a bias circuit coupled to the control terminal of the second transistor, the second transistor configured to convert the first transistor to a diode configuration responsive to detecting high voltage noise.

The invention provides an operational amplifier current noise testing device and method, relates to the technical field of operational amplifier noise testing, and aims to find out the position of an introduced pole by testing an input end capacitor and compensate the influence of the pole introduced by a sampling resistor and a stray capacitor in a mathematical correction mode so as to test the noise of the operational amplifier. Therefore, the current noise characteristic of the operational amplifier can be accurately measured. The device comprises a tested device module which comprises a to-be-tested operational amplifier and a sampling resistor, and the sampling resistor is used for converting current noise of the input end of the operational amplifier into voltage noise; the auxiliary amplifier module is used for further amplifying the voltage noise; the capacitance test module is used for testing the total input capacitance of the tested device module, and the total input capacitance comprises the input capacitance of the operational amplifier and the stray capacitance introduced by the system; wherein after the total input capacitance is obtained through testing, the attenuation frequency of the noise signal is corrected according to the total input capacitance, and the corrected noise signal is obtained.

The invention provides a chip power consumption attack detection method and system based on voltage comparison and a chip, and the method comprises the steps: deploying an analog voltage comparator between power grid nodes of an integrated circuit, and carrying out the real-time comparison of the voltage between the power grid nodes through the analog voltage comparator, detecting a voltage change caused by a power consumption analysis attack; extracting features of power grid nodes based on a voltage comparison result, and training the extracted features by using a linear support vector machine model to obtain a trained machine learning model; and finally, embedding the trained machine learning model into an integrated circuit to carry out power consumption analysis attack detection. The voltage difference between adjacent power grid nodes is detected through the analog voltage comparator, and the influence of voltage noise is compensated through multiple times of voltage comparison; the linear support vector machine model is selected as the power consumption analysis attack detection model, the power consumption analysis attack can be detected in real time, and the safety of a hardware system is ensured.

This void ratio acquisition method includes: a measurement results acquisition step of acquiring measurement results by measuring, over a predetermined time period, the voltage in a gas-liquid two-phase flow by using a probe; a frequency distribution creation step of creating a frequency distribution indicating the frequency of voltage values; a phase discrimination step of determining, as a liquid phase level voltage, the value of the voltage of a first peak which is the most frequent; a noise acquisition step of acquiring, as noise, the frequency of the value of the voltage having a small absolute value with respect to the liquid phase level voltage; and a void ratio acquisition step of taking the difference of noise from the frequency of the value of a voltage having a large absolute value with respect to the liquid phase level voltage, acquiring a frequency, from which the noise was removed, as a frequency ratio of the gas phase in the gas-liquid two-phase flow, and acquiring a frequency ratio of the gas phase as a void ratio.

The invention discloses a high-stability and high-power-supply-rejection-ratio LDO based on a BCD technology. The LDO comprises a pre-voltage-stabilizing circuit, a biasing circuit a, a biasing circuit b, a band-gap reference operational amplifier, a band-gap reference circuit, an error amplifier, a low-voltage-to-high-voltage-stage amplifier, a frequency compensation circuit and a power-stage amplifier. A high-voltage power supply domain is converted into a low-voltage power supply domain by utilizing the pre-voltage-stabilizing circuit, and a low-voltage power supply is provided for the band-gap reference circuit and the error amplifier; by isolating a high-voltage noise path and a low-voltage core circuit, the proportion of a high-voltage MOS (Metal Oxide Semiconductor) tube is reduced, and the power supply rejection ratio is improved; the low-frequency characteristic and the loop stability of the LDO are improved by adopting a pseudo ESR compensation technology and matching with a cyclic folded cascode structure; a band-gap reference and pre-voltage-stabilizing technology of a current mode structure is adopted to improve the power supply rejection ratio; the LDO with high stability and high power supply rejection ratio can meet the application requirements of high stability and high power supply rejection ratio, and can be applied to various driving chips.

Methods for arc detection in a system including one or more photovoltaic generators, one or more photovoltaic power devices and a system power device and / or a load connectible to the photovoltaic generators and / or the photovoltaic power devices. The methods may measure voltage, current, and / or power delivered to the load or system power device, and the methods may measure voltage noise or current noise within the photovoltaic system. The methods may periodically, and / or in response to detecting noise, reduce an electrical parameter such as current or voltage in order to extinguish an arc. The methods may compare one or more measurements to one or more thresholds to detect arcing, and upon a comparison indicating that arcing is or was present, an alarm condition may be set.

A laser frequency noise evaluation method for an atomic spin precession detection system comprises the steps that beat frequency signals are obtained through beat frequency of detection laser and reference laser, direct-current voltage forming a linear function relation with the beat frequency signal frequency is obtained through a frequency-to-voltage converter, and then a voltage noise spectrum is analyzed through a spectrum analyzer; and finally, analyzing the influence of the frequency noise in combination with a detection noise spectrum density recording result, thereby quantitatively evaluating the equivalent magnetic noise component in the detection signal caused by the fluctuation of the detection light frequency of the atomic spin precession detection system. Detection noise suppression can be realized through a noise separation method, and the detection sensitivity is improved.