62 results about "Circuit noise" patented technology

Disclosed in the present invention is a high-dynamic capacitive digital microphone system based on electrostatic force feedback. The system comprises an MEMS microphone and an interface circuit chip thereof, wherein the interface circuit chip comprises a charge pump, an analog front end, an analog-to-digital conversion circuit, an amplitude detection module, an amplitude adjustment control module and a pulse density modulation module. In the present invention, the characteristic of the sensitivity being able to be adjusted by means of changing a bias voltage by a capacitive sensor is used, and a charge pump with an adjustable output voltage is used to provide electrostatic force feedback, thereby further expanding the adjustable range of a front-end gain, and also reducing requirements for the noise performance of a readout circuit. Therefore, the system in the present application has the characteristics of high dynamic range and high-precision quantization.

The invention discloses a piecewise linear quantization mixed structure analog-to-digital converter with a noise shaping function, and belongs to the field of analog-to-digital converters, the analog-to-digital converter comprises an input control circuit, a nonlinear quantization circuit, a noise shaping modulation circuit, an output control circuit and a digital decimation filter circuit, the control circuit samples an input signal; the non-linear quantization circuit determines a non-linear section where an input signal is located and provides reference voltage for the noise shaping modulation circuit; the noise shaping modulation circuit is used for performing noise shaping and fine quantization on an input signal; the output control circuit combines the two parts of quantization output and generates a high-speed low bit code stream; the digital decimation filter circuit receives a high-speed code stream and generates a high-precision digital code through decimation filtering; according to the technology provided by the invention, suitable nonlinear quantization characteristics are provided according to different signal characteristics, and meanwhile, higher quantization precision and a wider dynamic range can be realized.

The invention relates to the technical field of sequential control, and discloses a sequential logic control circuit for a noise shaping SAR ADC (Synthetic Aperture Radar Analog to Digital Converter), which comprises an analog signal acquisition circuit for receiving and preprocessing an initial input signal; the noise shaping circuit is used for performing frequency spectrum shaping on quantization noise in the analog signal and generating the analog signal subjected to noise shaping; the successive approximation type analog-to-digital converter is used for performing bit-by-bit comparison with the analog signal subjected to noise shaping and gradually completing conversion from the analog signal to the digital signal from the highest bit to the lowest bit; and the clock control circuit is used for coordinating sequential logic among the analog signal acquisition circuit, the noise shaping circuit and the successive approximation type analog-to-digital converter. According to the method, frequency spectrum remodeling is carried out on the quantization noise in the signal, the signal-to-noise ratio of the signal is remarkably improved on the premise that the hardware complexity is not additionally increased, and then interference of the noise on follow-up analog-to-digital conversion is reduced.

The invention relates to the technical field of circuits, in particular to a wide-voltage power supply band-gap reference source circuit, a ferroelectric memory and a circuit control method.The circuit comprises a voltage stabilizing circuit, a starting circuit, a control circuit, a temperature compensation circuit and an amplifying circuit, and the voltage stabilizing circuit conducts voltage stabilizing adjustment on a received voltage signal to obtain a voltage stabilizing signal; the starting circuit is used for generating an activation signal according to the voltage-stabilizing signal; the control circuit is respectively connected with the voltage stabilizing circuit and the starting circuit to generate a reference control signal; the temperature compensation circuit obtains a temperature compensation signal according to the reference control signal; and the amplifying circuit is respectively connected with the other circuit points to generate a final reference circuit signal, so that the problem that the performance of the ferroelectric memory is reduced due to the fact that the suppression capability of the circuit on external power supply noise and ripple waves is reduced under the condition that the external power supply voltage is relatively wide and relatively high in the prior art is solved, and the overall performance of the ferroelectric memory is improved.

The present application relates to the technical field of laser detection, in particular to a laser striking target detection device and method for terminal defense. Firstly, the peak intensity of the light spot and the deflection vector of each channel of the wavefront sensor are collected in a single frame detection period, the real-time light intensity characteristics and the circuit noise are combined to generate a servo light intensity filtering threshold, the effective channel set with calculation value is screened out by dynamically adapting to the battlefield noise fluctuation; the direction consistency of the deflection vectors of the adjacent effective channels is calculated, the light spot connected weight network with coherent weight is constructed, the sub-aperture grouping area is obtained by clustering, and the automatic aggregation of the scattered same target light spots is realized; then the integrated light intensity connectivity is generated by fusing the peak intensity of the light spot and the local connected weight, the signal intensity and the spatial correlation attribute are considered, the real target tracking effective area is accurately stripped out, and finally the calculation accuracy is greatly improved by relying on the channel number characteristics and the deflection vector calculation servo command in the area.

The utility model provides a high-temperature-resistant sinusoidal signal source filter circuit, which comprises a high-stability oscillation source module, the high-stability oscillation source module is composed of a crystal oscillator Y1 and other elements, the frequency stability of an oscillation source is ensured, the output frequency of a sinusoidal signal source can be changed by changing the frequency of the crystal oscillator, an inverter U1B shapes and outputs oscillation source signals, and the signal quality is further ensured. The power supply filtering module effectively eliminates circuit noise and interference, the high-stability voltage source module supplies power to the oscillation source circuit through a resistor R1, a voltage stabilizing diode D1 and a capacitor C5, the temperature stability of the oscillation source circuit is good due to the characteristics of the voltage stabilizing diode D1, and it is guaranteed that the circuit works stably under different conditions. The signal amplitude adjusting module can flexibly change the output amplitude of the sinusoidal signal source, the active band-pass filtering module can accurately convert square wave signals output by the oscillation source into sine wave signals, parameter setting is reasonable, and the characteristics of quality factor Q, gain G, center frequency F and the like enable the signal processing effect to be good. And parameters of the band-pass filter are matched with parameters of the oscillating source during debugging, so that the circuit is stable and reliable in overall performance, and is suitable for high-temperature environments and other scenes with high signal quality requirements.

A kind of high integration 64 channel infrared video processor, including infrared signal processing component and focal plane component, and the size of main body is only 220mm*150mm*105mm, and weight is only 5kg.The present application solves the problems of high orbit super large area array infrared detector, such as many channels, fast readout rate, high real-time image processing on orbit, large data processing capacity, etc., with the progress of simplifying system complexity and improving system integration;At the same time, it solves the problems of traditional large area array infrared detector, such as many output analog channels, large amount of image data real-time processing pressure, leading to traditional infrared video processor, such as many, large volume, heavy weight, poor data transmission capacity, insufficient single video real-time data processing capacity, etc., with the progress of simultaneously collecting detector channel number reaching 64, detector readout rate reaching more than 10MHz, video circuit noise being better than 0.5mV, more than 10 data transmission channels and single transmission rate being up to more than 10Gbps, maximum real-time data throughput being 64Gbit and processing rate being higher than 1Gbps, high integration, miniaturization and light weight.

The application provides a gyro vibration displacement detection device and method, which comprises generation of high-frequency bipolar square wave, modulation of gyro vibration displacement, amplification of signals and demodulation of gyro vibration displacement signals, and is implemented through corresponding circuit modules. The application modulates the gyro vibration displacement signals to a carrier frequency higher than the gyro resonance frequency, avoids the influence of circuit noise and environmental noise on the gyro displacement detection precision and the crosstalk problem of the driving signal through the parasitic capacitance, and avoids the defects of complex circuit, high cost and the like caused by the high-frequency sine wave as the carrier, has the characteristics of low implementation circuit price, less digital circuit resource occupation, simple carrier generation circuit, no need of filter for extracting the gyro vibration displacement, and is suitable for high-performance Coriolis vibration gyro and other vibration body high-precision vibration displacement detection.

The invention relates to the technical field of weak current detection, and aims to solve the problems that a micro-current detection technology is easily influenced by circuit noise, environmental interference and switching delay, the range switching of current depends on a software process, and the risks of sampling delay, judgment lag and program runaway exist; the invention provides a self-adaptive threshold microampere-level current sampling network structure and a control method thereof, a plurality of parallel voltage acquisition amplification branches are connected with a to-be-measured microcurrent, a logic processing control circuit and a switch unit are utilized to complete range switching, a closed-loop feedback control circuit is formed through a latch and a NOT gate, and the self-adaptive threshold microampere-level current sampling network structure is used for sampling the to-be-measured microcurrent. Logic oscillation is avoided in the switching process, and the stability of the detection process is improved; only one voltage acquisition and amplification branch is allowed to be switched on at any moment through optocoupler control, the leakage current phenomenon in micro-current measurement is effectively restrained through the high isolation characteristic of optocouplers, mutual interference between different branch resistors is avoided, thermal noise in a sampling circuit is remarkably reduced, and the sampling precision and the signal-to-noise ratio are improved.

This invention relates to a low-noise, high-gain mixer. It employs a set of current-multiplexed transconductance amplifier circuits and a set of cross-coupled load circuits. Signal amplification is achieved through symmetrical P-type and N-type transconductors, resulting in a larger equivalent transconductance without increasing the path current. Simultaneously, a negative feedback resistor is connected between the input and output of the transconductor, eliminating the need for additional bias circuitry. An inductor is added between the source and ground of the transconductor to form a source negative feedback structure, increasing circuit stability without increasing power consumption or noise. Furthermore, the cross-coupled load circuit generates a larger equivalent load, achieving greater gain and improving circuit noise without increasing power consumption. This mixer exhibits high gain, low noise, and low power consumption.

The embodiment of the utility model discloses a packaging structure of a chip and electronic equipment. The packaging structure of the chip comprises a substrate; the packaging shell is fixed to the substrate, the packaging shell and the substrate jointly define a containing cavity, a through hole is formed in the side, away from the substrate, of the packaging shell, and the through hole communicates the interior of the containing cavity with the exterior of the packaging shell; the chip set is fixed on the substrate and is positioned in the accommodating cavity; and the light-proof glue is filled in the accommodating cavity through the through hole and wraps the chip set, so that external light is prevented from irradiating the surface of the chip set. The packaging shell is filled with the light shielding glue, so that the light shielding glue completely wraps the chip set, direct irradiation of external light to the surface of the chip is effectively avoided, and circuit noise, logic errors and device performance degradation caused by the light induction effect are prevented.

The invention provides an electronic cigarette heating noise suppression method, a readable storage medium and a circuit, and the method comprises the steps: generating a carrier signal with a first carrier frequency and a duty ratio being a current carrier duty ratio based on a battery voltage, and calculating a current fundamental wave duty ratio of a fundamental wave signal; a fundamental wave signal is generated, the carrier signal is modulated based on the fundamental wave signal, a high-frequency voltage control signal is obtained, and the first fundamental wave frequency is smaller than the first carrier frequency; and modulating the battery voltage to obtain a high-frequency voltage signal of which the average value is a target voltage value, and controlling a heating wire to heat under the high-frequency voltage signal. The low-frequency signal is used as the fundamental wave signal to modulate the high-frequency signal as the carrier wave signal, so that the overall frequency is larger than the frequency range capable of being collected by human ears, and the circuit noise generated when the electronic cigarette works is reduced.

The application provides a control circuit for reducing EMI noise in TFT_LCD display screen driving, which comprises at least polarity exchange circuit (2), EMI noise control module (1), N column first channel load 31, second channel load 32, S3…SN, and adjacent first channel load (31) and second channel load (32) as a group of basic working units; first NMOS switch tube (CSP1) and second NMOS switch tube (CSP2) are respectively connected to the ground at the positions of intermediate nodes EX1_P and EX2_P of the polarity exchange circuit (2), and the gates of all positive polarity channel NMOS discharge tubes in the N column first channel load 31, second channel load 32, S3…SN are connected together; first PMOS switch tube (CSN1) and second PMOS switch tube (CSN2) are respectively connected to the ground at the positions of intermediate nodes EX_N1 and EX_N2 of the polarity exchange circuit (2), and the gates of all negative polarity channel PMOS discharge tubes in the N column first channel load 31, second channel load 32, S3…SN are connected together. The application well combines soft discharge and hard discharge, and reaches the best level.

This invention provides an acceleration sensor, a detection method, and a program capable of accurately detecting circuit noise. [Solution] The acceleration sensor A1 comprises a sensor unit 1, a power supply circuit 2, and a detection circuit 3. The detection circuit 3 includes a first selector 6 that outputs one of the first charge signal S3 and the second charge signal S4 as a first select signal S10, a second selector 7 that outputs the remaining signal of the first charge signal S3 and the second charge signal S4 as a second select signal S20, an operation switching unit 30 that switches the operating state of the first selector 6 and the second selector 7, a CV conversion circuit 32 that outputs a first voltage signal S12 and a second voltage signal S22, a third selector 15 that alternately selects one of the voltage signals of the first voltage signal S12 and the second voltage signal S22 according to the pulse signal S0 and outputs the voltage signal as a third select signal S30, and a filter 34 that removes the high-frequency component of the third select signal S30.

The invention provides a biasing circuit of a voltage-controlled oscillator and the voltage-controlled oscillator, and belongs to the technical field of integrated circuits, and the biasing circuit comprises a current injection unit which is used for providing injection current; the first filtering unit is connected between the power supply voltage end and the control end of the current injection unit; the input end of the noise isolation unit is connected with injection current, the output end is connected to the voltage-controlled oscillator, and the noise isolation unit is used for providing bias current; and the second filtering unit is connected between the input end of the noise isolation unit and the grounding end. The beneficial effects are that the current injection unit is adopted to directly inject current instead of current mirror current, so that the problem of noise deterioration caused by current mirror overturning is avoided; the noise isolation unit can isolate the influence caused by the noise of the current injection unit; the first filtering unit and the second filtering unit can improve the power supply noise suppression capability of the voltage-controlled oscillator on the biasing circuit; all the units cooperate to jointly improve the bias circuit noise of the voltage-controlled oscillator, and the phase noise performance of the voltage-controlled oscillator is improved.

The utility model relates to the field of side sliding door motors, in particular to an EMI noise suppressor with a speed feedback function. The EMI noise suppressor comprises a filter circuit, the EMI noise suppressor is provided with a butt joint interface used for being connected with the motor controller, and the filter circuit is connected with the motor controller through the butt joint interface to suppress noise of the side sliding door motor. A Hall circuit is integrated in the EMI noise suppressor and comprises a Hall element, the Hall element is installed at the position close to an electric brush of the sideslip door motor, the power end of the Hall element is connected with a power input pin of the butt joint interface, and the output end of the Hall element is connected with a feedback signal pin of the butt joint interface through a signal conditioning circuit. And inputting the speed feedback signal into a motor controller. And the function of the EMI noise suppressor and the speed feedback function are combined on one circuit board, so that the size is reduced.

The invention belongs to the technical field of semiconductor device preparation, and discloses a depletion type nickel-zinc-oxygen charged particle detector and a preparation method thereof. The depletion type nickel-zinc-oxygen charged particle detector comprises an aluminum oxide single crystal, a nickel-zinc-oxygen region, a low-resistance zinc oxide region, an insulating layer and a metal electrode. The depletion type nickel-zinc-oxygen charged particle detector is designed, the concentration of a carrier at the back bottom of a detection sensitive region is controlled, the suppression of leakage circuit noise is realized by using a depletion region, meanwhile, the control of a conductive channel is realized, and an effective and simple process manufacturing technology is provided. The preparation problem of an oxide alpha particle detector with a high signal-to-noise ratio characteristic is solved, and the development of a novel depletion type nickel-zinc-oxygen charged particle detector is realized.

This invention relates to the field of weak current detection technology. Microcurrent detection technology is susceptible to circuit noise, environmental interference, and switching delays. Current range switching relies on software processes, which carries risks of sampling delay, judgment lag, and program crashes. This invention provides an adaptive threshold microampere-level current sampling network structure and its control method. Several parallel voltage acquisition and amplification branches are connected to the microcurrent to be measured. Range switching is achieved using logic processing control circuits and switching units. A closed-loop feedback control circuit is formed through latches and NOT gates to avoid logic oscillations during switching, improving the stability of the detection process. Optical coupler control ensures that only one voltage acquisition and amplification branch is allowed to conduct at any given time. The high isolation characteristics of the optocoupler effectively suppress leakage current in microcurrent measurement and avoid mutual interference between resistors of different branches, significantly reducing thermal noise in the sampling circuit and improving sampling accuracy and signal-to-noise ratio.

An estimation method for a noise figure of a circuit of a dilution refrigerator, and a control system. The method comprises: a measurement and control system outputting a microwave signal to a dilution refrigerator at a first temperature, and calculating a noise figure by means of a first calculation model; calculating, by means of a second calculation model, noise parameters and noise factors when the microwave signal enters several cold plates; and calculating, by means of a third calculation model, a noise factor of the microwave signal passing through the entire dilution refrigerator, substituting the noise factor into the first calculation model and converting same into a noise figure, determining a compensation amount on the basis of electronic components at the cold plates, and performing summation to obtain a total estimated value of the noise figure. In the method, a noise figure of an internal circuit of a dilution refrigerator is estimated by using the derivation of noise figures of a microwave signal passing through different temperature intervals of the dilution refrigerator, such that the noise figure of the internal circuit of the entire dilution refrigerator can be obtained, thereby solving the problem of it being difficult to measure a signal-to-noise ratio of a microwave signal at a quantum chip inlet under a low-temperature environment of a dilution refrigerator.

A semiconductor circuit includes: a switching circuit having at least one switching element Q; a ground wiring; and a current detection circuit connected between the switching circuit and the ground wiring. A noise eliminating circuit is connected between the switching circuit and the ground wiring in a parallel relationship with respect to the current detection circuit.

The invention discloses an amplifier power supply voltage stabilizing circuit noise floor detection method and device based on a high-stability crystal oscillator, and the method comprises the steps: enabling a constant-temperature crystal oscillator with excellent phase noise characteristics to input a signal to an amplifier through an adjustable attenuator; the output capacitance of a voltage stabilization chip at the power supply end of the amplifier is kept unchanged, the filter capacitance at the power supply pin end of the amplifier is firstly set to be a fixed value, and the input signal power of the amplifier is adjusted by adjusting the attenuation value of the adjustable attenuator; according to different input power values, phase noise testing is carried out at the output end of the amplifier in sequence, in a set of obtained curves, the positions where near-end noise and far-end noise have the same frequency offset inflection point are determined, and several preliminarily selected curves with the noise on the two sides of the inflection point close to each other when the amplifier is located in an amplified linear interval are found; and selecting the curve with the maximum corresponding input power from the preliminarily selected curves, and determining the noise value brought by the voltage stabilizing chip according to the near-end noise measured in the curve.

The application discloses a kind of N77 frequency band high gain multistage low noise amplifier, N77 frequency band is 3.3GHz-4.2GHz, it is related to radio frequency circuit design field.Gallium arsenide transistor ATF54143 three-stage cascade amplification structure is used, the design purpose of first stage is to obtain minimum noise, two three-stage is to obtain maximum gain and lower flatness, input-output matching uses series microstrip structure, π type microstrip structure is used at cascade, reduce circuit noise, improve overall gain, LC trap wave filter is added at the end to improve the gain uneven problem caused by multistage cascade.Finally, the gain of the low noise amplifier is greater than 34dB, the gain flatness is ±0.4dB, the noise figure is less than 1dB, the input and output return loss is less than-10dB, the input voltage standing wave ratio VSWR1 is less than 2, the output voltage standing wave ratio VSWR2 is less than 2, the output 1dB compression point is 12.5dBm, improve the performance of poor problems such as high noise, low gain and poor stability of N77 frequency band low noise amplifier at present stage.

The present invention discloses a noise reduction method, apparatus, headphone device, and storage medium. The noise reduction method is applied to the headphone device and includes: obtaining a first sound signal collected by a noise reduction microphone in the headphone device and a second sound signal collected by a call microphone; calculating a first correlation between the first sound signal and the second sound signal; when the first correlation is greater than a first preset threshold, extracting a signal from the first sound signal that makes the first correlation greater than the first preset threshold as an external sound signal; and performing active noise reduction processing based on the external sound signal. The present invention avoids the introduction of additional circuit noise during the active noise reduction process, thereby improving the user experience.

The invention relates to an operational amplifier-free high-order compensation band-gap reference circuit based on a CMOS (Complementary Metal Oxide Semiconductor) process, which is characterized in that a low-temperature high-order compensation module and a high-temperature high-order compensation module are designed to provide high-order positive temperature coefficient compensation current and high-order negative temperature coefficient compensation current for a reference core module respectively under low-temperature and high-temperature conditions; the reference core module outputs band-gap reference voltage with first-order temperature compensation and small change in the whole temperature range; the CMOS technology is adopted, under the condition that no operational amplifier is used, the band-gap reference voltage offset in the curvature calibration process is reduced, meanwhile, a very good temperature coefficient is achieved, circuit noise, power consumption and complexity are reduced, design allowance additionally needed by circuit design is reduced, and the band-gap reference with the low temperature coefficient is efficiently obtained; the method is suitable for application scenes requiring high precision and high stability, and the performance of an application scene system is provided.

The invention discloses an SAR ADC circuit, a noise suppression method and a nanopore sequencing chip, and the SAR ADC circuit is a double-sampling circuit, and comprises a first switch module, a second switch module, a third switch module, a fourth switch module, a sampling module, an amplifier, a holding module, a comparator and a logic circuit. According to the invention, the holding module is introduced into the circuit for temporarily storing charges, meanwhile, the logic circuit is matched to carry out four-stage time sequence control on the four switch modules, and a time sequence multiplexing and capacitor charge redistribution technology is utilized, so that noise elimination is completed in a circuit sampling stage. The method does not need an additional calibration period, and the efficiency is improved; the sampling noise can be effectively inhibited only by adding the micro capacitor and the switch, the area of the sampling capacitor is greatly reduced, the array density of the nanopore sequencing chip is improved, and the cost of a chip product is reduced.

The invention discloses a Bluetooth ranging method and system, electronic equipment and a storage medium, and the method comprises the steps: scanning on a Bluetooth channel frequency, and calculating a measurement distance at a t moment according to a channel response signal of the Bluetooth channel frequency; predicting a prior state vector at the moment t by adopting the posterior state vector at the moment t-1 and the control vector at the moment t-1; calculating a posterior state vector at the moment t according to the prior state vector at the moment t, the measurement distance at the moment t and the Kalman gain at the moment t; and extracting a distance parameter at the t moment from the posterior state vector at the t moment. According to the invention, the problem of sudden change of the distance measurement result caused by the influence of environmental electromagnetism, multipath effect and circuit noise can be improved, and the finally obtained distance parameter has higher reliability.

Noise immunity of a protocol determination circuit that determines a communication protocol between circuits is improved. A protocol determination circuit includes: a sampling circuit; and a majority decision circuit. The sampling circuit performs a plurality of number of times of sampling on a protocol specifying signal, the protocol specifying signal being any one of a value indicating a first communication protocol I2C and a value indicating a second communication protocol SPI. The majority decision circuit outputs a majority decision signal, the majority decision signal indicating a communication protocol corresponding to a value sampled majority number of times in the plurality of number of times of sampling.

The invention discloses a vegetable detection system and method, and relates to the technical field of agricultural product quality detection, and the method comprises the following steps: collecting an electromagnetic change signal, a sensing line noise signal and a power supply fluctuation signal at a vegetable detection site, drawing an interference change curve according to the collection result, recording the time positions of sudden rising and zero returning of the detection signal; and identifying an interference source according to the interference change curve, analyzing a propagation direction and a coupling path of electromagnetic waves, extracting an interference frequency band and a continuous time period, and forming a signal anomaly comparison table. According to the invention, through multi-source interference signal acquisition and feature recognition, real-time sensing and adaptive avoidance of electromagnetic interference are realized, and stability of vegetable detection signals is guaranteed; the detection rhythm is planned based on the interference risk list and the sampling and illumination periods are dynamically adjusted, so that signal drift and fluctuation are effectively suppressed, continuous and accurate detection in a complex environment is realized, and the detection reliability and the data consistency are improved.

The invention relates to the technical field of network security, in particular to a fault analysis method and system for FTTR equipment and a medium. The method comprises the following steps: S1, carrying out photoelectric signal acquisition on FTTR equipment to obtain initial light intensity fluctuation data and initial circuit noise data; performing time-frequency conjoint analysis on the initial light intensity fluctuation data and the initial circuit noise data to obtain fusion signal feature data; performing graph neural network modeling on the fused signal feature data to obtain a photoelectric coupling correlation model; performing fault probability calculation and abnormal correlation analysis on the FTTR equipment based on the photoelectric coupling correlation model and the initial circuit noise data to obtain fault positioning data; and acquiring equipment management protocol data and network service flow data. According to the method, the potential fault position and the associated elements of the FTTR equipment can be accurately locked, and the accuracy and the efficiency of fault positioning are remarkably improved.

According to one embodiment, a circuit noise determination system includes a reading unit that reads a netlist representing a target circuit and analysis settings for noise analysis. A noise calculation unit is provided in the system to calculate noise values of circuit elements of in the target circuit according to the netlist along with a circuit classification unit that identifies and classifies circuit element in the target circuit. The system further includes a noise determination unit that outputs a notification regarding elements exceeding a noise upper limit reference value set based on a plurality of noise determinations prepared in advance for each circuit classification.