32 results about "Circuit noise" patented technology

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.

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 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.

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.

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.

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.

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.

It is required to obtain an electric rotating machine apparatus that secures a heat-radiation property, suppresses upsizing, and can suppress the effect of noise generated from a current-supply circuit. The electric rotating machine apparatus according to the present disclosure includes an electric rotating machine, a heat sink having a plate-shaped portion extending toward axial-direction one side, a current-supply circuit board that is disposed on one surface of the plate-shaped portion of the heat sink and on which a current-supply circuit for supplying an electric current to the electric rotating machine is mounted, and a control circuit board that is disposed in such a way as to be spaced apart from and in parallel with the current-supply circuit board and on which a control circuit for controlling the current-supply circuit is mounted. In addition, an electric power steering apparatus according to the present disclosure includes the foregoing electric rotating machine apparatus.

The invention relates to a high-sensitivity unmanned aerial vehicle laser detection system and method, and the system comprises a pulse laser transmitting module which is used for transmitting a pulse laser signal to a target; the pulse laser receiving module is used for receiving an echo laser signal reflected by a target; the rotary scanning module is connected with the pulse laser emission module and is used for driving the laser emission direction to scan within a preset angle range; the distance measurement module is connected with the pulse laser receiving module and is used for carrying out target distance measurement based on the flight time of the pulse laser; the system driving control module is respectively connected with the pulse laser transmitting module, the rotary scanning module and the distance measuring module; through optical system optimization, circuit noise suppression and related detection algorithms, within the detection distance of 2 km, the signal-to-noise ratio of echo signals of the unmanned aerial vehicle is increased by 20.2 dB, the minimum detectable power of the system is reduced to 72 pW, and weak reflection signals of a long-distance'low, slow and small 'target can be effectively captured.

The application discloses a kind of logic circuits based on high electron mobility transistor, belong to semiconductor device technical field, including by or non-gate and non-gate combination or gate circuit, and by and non-gate and non-gate combination and gate circuit.Or non-gate, and non-gate and non-gate are respectively integrated by parallel / series connection of depletion-mode HEMT device and enhancement-mode HEMT device.Construction is adopted in the present application lower layer gradual barrier layer or ladder gradual barrier layer, in combination with ion implantation area design, accurately control threshold voltage from material growth source, completely solve the technical problems of poor threshold voltage consistency and low stability caused by traditional gate recess etching process.Circuit noise tolerance is improved, static power consumption is effectively reduced, and is suitable for high-performance, low-power radio frequency and digital integrated electronic system.

The utility model provides a high-fidelity I / V conversion circuit for an audio DAC, which relates to the technical field of conversion circuits, and uses zero devices including operational amplifiers U1 and U2, a resistor R2 and a capacitor C2. The operational amplifier U1, the resistor R2 and the capacitor C2 form a subtractor with low-pass filtering, the positive end and the negative end of the subtractor are connected to the output end L-and the output end L + of the DAC respectively, and the output is L-out; the operational amplifier U2, the resistor R2 and the capacitor C2 form another subtractor with low-pass filtering, the positive end and the negative end of the subtractor are connected to the output end L + and the output end L-of the DAC respectively, and the output is L + out. As the potentials of L + and L-are the same, the direct-current potential of the output end is 0 potential, the alternating-current voltage is doubled, and meanwhile suppression on in-phase alternating-current signals is enhanced. According to the utility model, the suppression of the subtraction circuit to the in-phase alternating current signal is doubled, so that the circuit is lower in bottom noise and lower in distortion degree.

A clock output device includes a noise detector circuit and a clock buffer circuit. The noise detector circuit is configured to be enabled according to a request signal to determine whether a reference clock signal is a noise according to at least one of a common-mode level or a frequency of the reference clock signal and generate an enable signal. The clock buffer circuit is configured to be enabled according to the enable signal to generate an output clock signal according to the reference clock signal.

Systems and devices are disclosed that provide for stackable electrical power systems that provide poly-phase alternating current electricity output. Each electrical power system can be configured with a synchronizer to communicate with at least one other synchronizer, whereby each of the communicating synchronizers becomes synchronized. The synchronizers enable stacking a plurality of electrical power systems without creating feedback, circuit noise, or other drawbacks of the currently existing technology, thus enabling stacking to greater degrees and in more configurations than presently possible.

The utility model discloses an optical analysis circuit for molecular diagnosis equipment, which belongs to the field of medical molecular diagnosis equipment, and a light-emitting circuit of the optical analysis circuit is good in consistency due to the fact that current amplification is carried out in an operational amplifier; the detection circuit reads the reference voltage before the DAC1 works each time, so that the influence caused by natural light, circuit noise and operational amplifier drift can be effectively eliminated, and the depth of stripes can be effectively read. The circuit mainly comprises a light-emitting circuit and a detection circuit, the detection circuit comprises an operational amplifier U3 and a voltage follower circuit, the negative input end of the operational amplifier U3 is connected with a photosensitive diode PD, and the output end of the voltage follower circuit is connected with the positive input end of an operational amplifier U4. The output end of the operational amplifier U3 is connected with the negative input end of the operational amplifier U4 through a resistor R18. The utility model is mainly used for optical analysis of molecular diagnosis equipment.

A system for secure cryptographic key generation using chaotic oscillator-based entropy units, wherein the system comprises the following: a housing designed for integration into a machine or electronic device; one or more chaotic oscillator units physically arranged within the housing, each chaotic oscillator unit comprising a nonlinear electronic circuit configured to operate in a chaotic dynamic regime to generate an aperiodic analog signal sensitive to initial conditions and intrinsic circuit noise; a signal acquisition unit electrically connected to one or more chaotic oscillator units and configured to receive the aperiodic analog signal, wherein the signal acquisition unit includes an analog conditioning circuit configured to normalize the signal amplitude and limit the signal bandwidth to a predefined operating range; a converter unit that is electrically coupled to the signal acquisition unit and is configured to sample the processed analog signal at time-varying sampling intervals to generate a digital entropy data stream; a processing unit comprising one or more processors operationally linked to a non-volatile memory, wherein the processing unit is configured to perform entropy conditioning operations on the digital entropy data stream to suppress distortions and reduce temporal correlation; a key generation unit that is operationally coupled with the processing unit and configured to convert conditional entropy data into cryptographic key material of a predefined key length; and a secure storage unit that is operationally connected to the key generation unit and is configured to store the cryptographic key material while preventing unauthorized external access, wherein the system is configured to generate cryptographic keys from physically chaotic behavior without relying on deterministic, purely software-based entropy sources.

The application discloses a feedforward low-voltage linear voltage stabilizing circuit with a symmetrical structure and a voltage stabilizing output method, and belongs to the field of integrated circuit design. The application amplifies power noise by a feedforward current channel, carries out summation operation with circuit noise amplified by an error amplifier in a summation operation current channel, inputs the amplified noise to a gate of a power tube, and is used for eliminating extra noise generated at an output end, so that the power supply rejection ratio under high frequency can be improved without increasing loop bandwidth to increase static power consumption; the circuit structure is symmetrical, the feedforward current channel is multiplexed, and an output is connected to two symmetrical summation operation amplifiers, so that the power supply rejection ratio of the LDO is improved, and the linear adjustment rate and the load adjustment rate of the LDO are also improved to a certain extent. The application can be applied to an IP module sensitive to power noise, and high-precision and low-noise stable voltage is provided for the IP module.

The utility model relates to the technical field of millimeter-wave radars, and discloses a power management circuit of a millimeter-wave radar, which comprises a filter circuit; a switching voltage stabilizing circuit; a linear voltage stabilizing circuit; a protection circuit; a power supply regulation and control circuit; the filter circuit, the switching voltage stabilizing circuit and the linear voltage stabilizing circuit are connected in sequence, and the filter circuit, the switching voltage stabilizing circuit, the linear voltage stabilizing circuit and the protection circuit are electrically connected with the power supply regulation and control circuit. According to the utility model, through the design of the filter circuit, unwanted frequencies in signals can be filtered out, the signal-to-noise ratio of the radar is improved, and the purposes of eliminating noise and enhancing the signals are achieved; through the design of the switching voltage stabilizing circuit, the stability of output voltage can be ensured, the influence of voltage fluctuation on the performance of the millimeter wave radar can be reduced, through the design of the linear voltage stabilizing circuit, the circuit structure can be optimized, a filter network can be added, the circuit noise can be reduced, normal work can be realized under the condition of small input and output voltage difference, and the power supply utilization rate can be improved.

The embodiment of the present disclosure provides a control amplification method and circuit, a sensitive amplifier and a semiconductor memory, the method comprises the following steps: receiving a preset instruction, determining an isolation power value and a control instruction signal according to the preset instruction; generating an isolation control signal according to the isolation power value and the control instruction signal; the amplification circuit receives the isolation control signal and a target signal to be processed according to the preset instruction, processes the signal to be processed, and completes the preset instruction. In this way, the specific voltage value of the isolation control signal is controlled through the isolation power value, the signal amplification process can be optimized, the signal amplification speed can be improved, and the problem of large circuit noise can be improved.

The invention belongs to the field of analog integrated circuits, and particularly relates to a low-power-consumption temperature sensor based on an MOS tube. A relaxation oscillator with a negative temperature characteristic is used as a temperature sensor, and the output square wave period and the temperature are in a linear relation. The MOS tube M1 in the oscillator has the dual functions of signal amplification and temperature sensing: on one hand, the common-gate amplifier is used for amplifying the voltage of an upper pole plate of a capacitor, increasing the input swing of a comparator and reducing the charge quantity of single charge and discharge, so that the power consumption is remarkably reduced; and on the other hand, the amplified signal improves the input slope at the overturning point of the comparator, the comparison speed is increased, and the influence of circuit noise on oscillator jitter is effectively suppressed. According to the invention, temperature sensing is carried out by using the voltage temperature characteristic of the MOS tube working in the sub-threshold region, the limitation of a traditional sub-threshold region current temperature sensing mode is avoided, low-power-consumption, high-resolution and high-precision measurement in a wide temperature range is realized, and the effective temperature sensing range of the MOS type temperature sensor is obviously widened.

The utility model discloses a radio frequency band-pass filter circuit, and belongs to the technical field of filtering. The system mainly comprises a high-frequency signal acquisition unit used for being electrically connected with an ultrahigh frequency sensor, and the high-frequency signal acquisition unit converts a high-frequency electromagnetic wave signal into a voltage signal and inputs the converted signal to an amplification circuit unit for amplification processing; the output end of the amplifying circuit unit is electrically connected with the primary filter; the first-stage filter is used for filtering the electric signals with the frequency value smaller than f1; the electric signal processed by the primary filter is electrically connected with the input end of the low-pass filter, and the output end of the low-pass filter outputs a power-on electric signal to the MCU main control chip; and the cut-off frequency of the low-pass filter is f2. The circuit is simple and reasonable in design, can accurately and effectively screen out the frequency band of a flashover signal, is high in noise reduction capability, is high in anti-interference performance, is low in production cost, is high in cost performance, is low in fault rate, is high in reliability, and is very high in market competitiveness.

A high-precision time interval measurement method based on frequency domain cutting technology, comprising: encoding two time signals to be measured into the same wideband analog signal; filtering and analog-to-digital converting the wideband analog signal to output several narrowband digital signals; performing cross-correlation operation on the corresponding two digital signals to obtain the time interval between the corresponding narrowband signals; and comprehensively processing the time intervals between all the narrowband signals to obtain the measurement result. The method can effectively reduce the interference of the two-way noise on the time interval measurement result, and improve the accuracy and stability of the measurement result. The application provides a high-precision time interval measurement device based on frequency domain cutting technology, comprising: a wideband signal encoding unit, an analog-to-digital conversion and filtering unit, and a digital processing unit. The application effectively reduces the influence of circuit noise on the measurement result in the time interval measurement process, and improves the accuracy and stability of the measurement device.

The invention provides an analog front-end receiving circuit for an active pen, a noise cancellation unit and a noise cancellation method. The circuit comprises a current transmitter, a band-pass filter and a comparator which are connected in sequence, the current transmitter receives an input signal and outputs a current signal; the band-pass filter receives the current signal, filters a noise signal and then outputs a first voltage signal; the comparator receives the first voltage signal and outputs a digital square wave signal. In a multi-channel parallel working mode, in-band common-mode interference with overlapped frequency and active pen signals is actively counteracted through current averaging and subtraction operation by utilizing spatial correlation of common-mode noise on each induction channel, and the signal-to-noise ratio and the anti-interference capability of the system are improved.