91 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 C / X wave band ultra-wideband GaAs MMIC low-noise amplifier, and mainly relates to the technical field of radio frequency front ends. Comprising an input matching network used for receiving a radio frequency signal and performing impedance matching so as to effectively transmit the signal to a subsequent active amplification part; and the active amplification part adopts an improved cascode-cascode cascade amplification structure and is used for amplifying the radio frequency signal transmitted by the input matching network. The amplifier has the advantages that an improved cascode-cascode cascade amplification structure is adopted, the gain is improved through an improved Cascode structure, the noise coefficient of the circuit is reduced, and the performance indexes of ultra wide band, low noise and high gain are achieved. The design of the structure not only improves the overall performance of the amplifier, but also enables the amplifier to keep stable gain output in a broadband range, and effectively solves the problems of low gain and high noise of a traditional low-noise amplifier in broadband application.

The invention discloses a noise suppression circuit and image acquisition equipment, the noise suppression circuit comprises a power supply noise sampling circuit, a noise conversion circuit and a noise elimination circuit, the power supply noise sampling circuit is connected with an interface and a power supply circuit, and is used for extracting electric power from the interface and providing the electric power for the power supply circuit, sampling current of the power supply circuit and eliminating noise; obtaining a current interference signal; the noise conversion circuit is connected with the power supply noise sampling circuit and is used for converting the current interference signal into a voltage interference signal; the noise elimination circuit is connected with the interface and the noise conversion circuit, and is used for carrying out noise reduction processing on the uplink signal received by the interface based on the voltage interference signal. Through the above mode, the problem that the current fluctuation signal and the low-frequency uplink signal cannot be eliminated when the frequency bands are overlapped can be solved, so that the probability of error codes in uplink data demodulation is reduced, and the communication reliability and the communication efficiency are improved.

The invention provides a control circuit applied to TFT LCD display screen drive to reduce EM noise, which at least comprises a polarity exchange circuit (2), an EM noise control module (1) and N columns of first channel loads 31, second channel loads 32, S3... SN, and the adjacent first channel loads (31) and second channel loads (32) are used as a group of basic working units; a first NMOS switch tube (CSP1) and a second NMOS switch tube (CSP2) are respectively grounded at the positions of intermediate nodes EX1P and EX2P of the polarity exchange circuit (2), and grid electrodes of all positive polarity channel NMOS discharge tubes in N columns of first channel loads 31, second channel loads 32, S3... SN are connected together; a first PMOS switch tube (CSN1) and a second PMOS switch tube (CSN2) are respectively grounded at positions of intermediate nodes EXN1 and EXN2 of the polarity exchange circuit (2), and grid electrodes of all negative polarity channel PMOS discharge tubes in N columns of first channel loads 31, second channel loads 32, S3... SN are connected together. According to the invention, soft discharge and hard discharge are well fused to reach the optimal level.

The invention particularly relates to a noise evaluation method for a fiber-optic gyroscope circuit, and solves the technical problem that the performance index of a fiber-optic gyroscope is influenced as a certain difference exists between theoretical estimation and theoretical calculation according to a noise parameter model of a component in a traditional circuit noise evaluation method. The invention relates to a noise evaluation method of a fiber-optic gyroscope circuit, which comprises the following steps: S1, inputting a reference voltage signal into a pre-amplification circuit of the fiber-optic gyroscope circuit to be tested, amplifying the reference voltage signal, and sending the amplified reference voltage signal into an analog-to-digital conversion unit; s2, collecting the amplified reference voltage signal according to the set sampling frequency; s3, the summation of the first m data and the summation of the last m data of each sampling period are solved; (n-1) difference values # imgabs0 # are obtained through subtraction, then sliding filtering is carried out on the difference values # imgabs1 #, the sum of # imgabs2 # of each sliding period is obtained and recorded as data # imgabs3 # S4, and the data # imgabs4 # are sent to an external control unit; and S5, calculating a peak-to-peak value and / or a standard deviation of the curve for representing the noise level of the fiber-optic gyroscope circuit.

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.

The utility model relates to a teaching instrument for measuring Boltzmann constants and electronic charges through a noise method. The teaching instrument comprises an amplifier, a change-over switch, a resistance box, a shot noise measuring device, an analog-to-digital converter and a data processing device. The fixed end of the change-over switch is electrically connected with the input end of the amplifier; a semiconductor device is arranged in the shot noise measuring device, and the switching end of the change-over switch is used for switching between the measuring end of the resistor box and the measuring end of the shot noise measuring device; the analog-to-digital converter is electrically connected with the output end of the amplifier; the input end of the data processing device is electrically connected with the output end of the analog-to-digital converter. The circuit noise is used for measuring the Boltzmann constant and the electronic charge, the data measurement object is only voltage data, the operation is simple, the learning demand of students on the circuit noise is met, and the market demand of such teaching instruments except the PN junction measurement principle is filled up. According to the teaching instrument, integrated experimental equipment is used, and two different college physics experiments can be carried out only by replacing a circuit.

The invention provides a gate driving circuit and a display device, the gate driving circuit comprises multiple levels of gate driving units, and each level of gate driving unit comprises a pre-charging module, a pull-down module, a stabilizing module and an output module; the output module and the pre-charging module are connected to a first node; the output module comprises a first switch element, a pre-output unit and a first pull-down stabilizing unit; a first control end of the first switch element is connected with a first node, a first access end is connected with a third node, and a second access end is connected with an output end; the pre-output unit charges a third node according to a pre-stage grid output signal and a current-stage first clock signal; the first pull-down stabilization unit is used for pulling down the third node to a low level according to the second clock signal of the level in the stabilization stage, and the high level time period of the second clock signal of the level is not overlapped with the high level time period of the first clock signal of the level. The circuit noise can be effectively reduced, the high temperature resistance is improved, and the display device can be used in more use scenes.

The present application discloses a bandgap reference circuit, a system on chip and a chip. The bandgap reference circuit includes a reference acquisition unit, an isolation buffer unit and an operation output unit; the operation output unit is connected to the isolation buffer unit; the isolation buffer unit is connected to the reference acquisition unit; the operation output unit is connected to the reference acquisition unit. The present application can set an isolation buffer unit between the operation output unit and the reference acquisition unit, and the isolation buffer unit can reduce the circuit noise of the reference acquisition unit, thereby improving the accuracy of the circuit output reference voltage. The present application can be widely used in the field of integrated circuit technology.

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.

According to the successive approximation type analog-to-digital converter, on the basis of a traditional ADC capacitor array and a segmented capacitor DAC structure, an additional series switch and an additional output switch are added, the series switch and the output switch are switched in cooperation with corresponding calibration logic, and when the weight of an array capacitor in each segment is calibrated, the weight of the array capacitor in each segment can be calibrated, so that the weight of the array capacitor in each segment is calibrated. A large voltage change amplitude can be obtained at the output end of the capacitor array, so that the sensitivity to circuit noise and comparator imbalance is reduced by 1-2 orders of magnitude or more when a low-order array capacitor is calibrated in the weight calibration process of the array capacitor, and a more accurate weight calibration result of the array capacitor is obtained. Therefore, the successive approximation type analog-to-digital converter has better linearity on the whole, and has the advantages of simplicity in implementation, low extra cost and high universality. The invention discloses a calibration method of the successive approximation type analog-to-digital converter.

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.

A noise control circuit for an isolated switching circuit is disclosed. The noise control circuit generates a reverse noise signal by adjusting off-chip components or feedback signals from circuit noise points, and couples the reverse noise signal to a suitable end point of the circuit, thereby offsetting the noise at the circuit noise point, so as to prevent the noise from being transmitted to the power supply end of the isolated switching circuit and causing noise pollution. The noise control circuit of the present invention reduces the influence of the switching noise caused by the switching action of the isolated switching circuit on the power supply end, and improves the EMI (Electro-Magnetic Interference) characteristics of the circuit.

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.

The utility model provides a high precision inclination angle measuring circuit, including several sets of inclination angle noise reduction circuit, analog-to-digital converter, microcontroller, inclination angle noise reduction circuit include MEMS inclination angle sensor, signal conditioning circuit and output resistor that are electrically connected in proper order, several output resistor are all electrically connected with analog-to-digital converter, and microcontroller is electrically connected with the analog-to-digital converter. The MEMS tilt angle sensor is used for collecting tilt angle information of the structure and converting the tilt angle information into a differential voltage signal, the signal conditioning circuit is used for receiving the differential voltage signal for noise reduction processing and converting the differential voltage signal after noise reduction processing into a single-end voltage signal, and the output resistor is used for reducing disturbance in the single-end voltage signal output process. The analog-to-digital converter is used for gathering analog signals of output voltages of the multiple groups of inclination angle noise reduction circuits and converting the analog signals into digital signals, and the microcontroller is used for processing the digital signals and sending the processed signals to a remote monitoring terminal. The high-precision inclination angle measuring circuit provided by the utility model is low in noise and low in cost.

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 sensor power supply system with bidirectional switching between an adaptive charge pump and a voltage regulator includes a noise extraction circuit, a noise quantizer, a control circuit for switching between a charge pump and a voltage regulator, a charge pump circuit, and a voltage regulator circuit. The noise extraction circuit is connected to the differential voltage signal output of the sensor, and is used to process the differential voltage signal to obtain a noise energy value, and output the noise energy value to the noise quantizer; the noise quantizer is used to compare the noise energy value with a set noise energy threshold, and output a control instruction to the control circuit; the control circuit is used to switch the charge pump circuit and the voltage regulator circuit according to the control instruction; the charge pump circuit and the voltage regulator circuit provide two power supply modes for the sensor. Providing a power supply system for the sensor compensates for the impact of the increased noise of the pressure touch system, so that the system as a whole maintains a sufficient signal-to-noise ratio and stabilizes the signal-to-noise ratio, thereby ensuring a high pressure sensing recognition rate and measurement accuracy.