73 results about "Flicker noise" patented technology

A system for audio segmentation for context change detection in speech is disclosed. The system accesses a speech signal of a user and identifies the user based on the voice print associated with the user. The system detects a potential context change between a first audio frame and a second audio frame of the speech signal. The system splits the speech signal into a first set of split audio frames based on the potential context change. The system generates a noisy speech signal by modulating a flicker noise signal into the speech signal. The system splits the noisy speech signal into a second set of split audio frames. The system detects a difference between the first and second sets of split audio frames. The system reconfigures a modulation of the speech signal with the flicker noise signal to reduce the difference between the first and second sets of audio frames.

The invention discloses a multi-step capacitive sensor reading circuit and an implementation method thereof. An incremental zoom capacitive sensor reading circuit is improved. A sampling method for improving chopping is designed, extra hardware overhead is not introduced, the working time sequence of the CDC is fully utilized, sampling noise and offset and flicker noise of a first-stage integrator are eliminated together, and the problems that power consumption is increased, measurement time is prolonged and the like existing in common methods of multiple sampling averaging and sampling noise elimination technologies are solved. A self-biased floating inverting amplifier is prepared, and the self-biased floating inverting amplifier is used as a first-stage integrator, so that the energy efficiency of the system is improved, and the use of a common-mode feedback circuit is also avoided. The method realizes high energy efficiency, high precision and low delay, and can be widely applied to the fields of robots, unmanned aerial vehicles and the like.

The invention relates to a method and system for extracting a flicker noise model of a high-voltage MOS device, and the method comprises the steps: designing high-voltage MOS devices of different sizes, and carrying out the measurement to obtain the DC characteristic data of each device in an operable voltage range and the flicker noise characteristic data of each device under different bias voltage conditions; based on the direct-current characteristic data, performing model fitting on the direct-current performance of the high-voltage MOS device to obtain a direct-current characteristic model, the direct-current characteristic model comprising an intrinsic current part and a collision ionization current part; and based on the direct current characteristic model and the flicker noise characteristic data, carrying out model fitting on flicker noise brought by the intrinsic current part and flicker noise brought by the collision ionization current part to obtain a flicker noise model. By fitting the noise source model associated with the magnitude of the collision ionization current, the flicker noise characteristics of the collision ionization current part are subjected to function characterization, and the flicker noise characteristic characterization precision of the high-voltage MOS device under high-voltage bias is improved.

The invention discloses a pulse wave signal detection-oriented transimpedance amplifier circuit with input voltage clamping and current offset functions, and relates to the technical field of integrated circuit design, the pulse wave signal detection-oriented transimpedance amplifier circuit comprises a pseudo-differential structure, a current offset module and a photosensitive diode, the pseudo-differential structure is composed of two independent operational amplifiers with double-end input and single-end output, the trans-impedance amplifier of a pseudo-differential structure composed of two independent operational amplifiers with double-end input and single-end output is used, the same voltage is connected to the same-direction input end of the trans-impedance amplifier, voltage clamping is carried out on double-end input, the differential mode precision and low-frequency stability of an input virtual site are improved, differential mode imbalance and flicker noise caused by operational amplifier mismatch are eliminated, and the stability of the trans-impedance amplifier is improved. The dynamic range of the pulse wave detection system is improved, and the pulse wave detection system has the advantages of high-precision and wide-range ambient light suppression effect, high circuit reliability, low circuit complexity, easy implementation, high loop stability, small area and low power consumption.

A four-dimensional (4D) light-detection-and-ranging sensor using frequency modulated continuous wave is provided with an ultra-high velocity resolution. At a transmitting terminal, the hybrid waveform of a driving laser is used to minimize the phase noise generated by a distributed-feedback laser during wavelength scanning. The hybrid waveform is obtained by combining direct-current signal (not modulated) and alternating-current (AC) signal. The AC signal is a predistorted triangle or AC waveform for extracting location. The continuous wave (CW) extracts velocity. At a receiving terminal, a radar radio-frequency receiver is combined with an avalanche photodiode (APD) with multiple layers accumulated in series to obtain excellent responsivity and saturated current. The mixed waveform coordinated with the APD prevents Doppler shift frequency from being contaminated by low-frequency flicker noise. Thus, a good-quality 4D image is provided; and the use of the APD improves the pixel contrast between the object and background.

The invention relates to a W-band low-noise voltage-controlled oscillator based on a transformer resonant cavity and harmonic extraction. The W-band low-noise voltage-controlled oscillator comprises a dual-core in-phase coupled oscillator core, a two-bit switched capacitor bank, a linear variable capacitor bank and an output buffer, the dual-core in-phase coupled oscillator core comprises a transformer resonant cavity and a harmonic extraction network, a fundamental wave oscillation signal is generated in the transformer resonant cavity and is coupled and output to the output buffer, and a high-power second harmonic oscillation signal is generated in the harmonic extraction network and is output as a target oscillation signal; the two-bit switched capacitor bank adopts an HBT switch with excellent high-frequency performance, the tuning range of the oscillator is divided into four sub-bands, and the tuning gain is reduced; the capacitance value of the linearized variable capacitor bank is linearly changed along with the tuning voltage height, and a conversion mechanism of flicker noise is inhibited; and the output buffer realizes load isolation and buffering of the fundamental wave oscillation signal. The voltage-controlled oscillator has low tuning gain and high output power in the W wave band, and excellent phase noise is achieved.

In one aspect, a transistor includes a diffusion region having a drain, a source, and a channel between said drain and source. The transistor further includes an isolation region around said diffusion region for electrically isolating said transistor. In addition, the transistor includes a gate poly overlapping at least a part of said channel, wherein said diffusion region extends laterally beyond said gate poly in a channel width direction.

The present invention discloses a low phase noise voltage controlled oscillator, which receives the output voltage of LPF, and includes: a three-stage delay unit, a first NMOS tube, a second NMOS tube, a first PMOS tube, a second PMOS tube, a third PMOS tube, a fourth PMOS tube, a resistor and a capacitor, wherein the gates of the first NMOS tube and the second NMOS tube respectively receive the output voltage of LPF; the sources of the first NMOS tube and the second NMOS tube are respectively grounded; the drain of the first NMOS tube is connected to the drain of the first PMOS tube; the drain of the second NMOS tube is connected to the drain of the third PMOS tube. The present invention effectively compresses the low-frequency flicker noise of VCO.

[Problem] To provide a noise event removal device making it possible to maintain the detection accuracy of true events while also removing flicker noise events. [Solution] An optical detection device according to one embodiment of the present disclosure is provided with: a noise event mask unit for performing mask processing to remove illumination flicker noise from an event signal indicating a result of detecting, as an event, a change in the amount of light reception at pixels when a subject lit by the illumination was imaged in a predetermined frame; and an event restoration unit for performing event restoration processing to restore a true event that was lost due to the mask processing.

The utility model discloses a band-gap reference current source and a power-on reset circuit, and relates to the technical field of power-on reset circuits. The reset circuit comprises a low-noise current reference circuit and a reference current and power-on reset signal output circuit, and the signal output end of the low-noise current reference circuit is connected with the signal input end of the reference current and power-on reset signal output circuit. The low-noise current reference circuit is used for generating a current signal required by the reference current and power-on reset signal output circuit, and the reference current and power-on reset signal output circuit is used for processing the input current signal and respectively outputting a band-gap reference current signal and a power-on reset signal. According to the low-noise band-gap reference current circuit, the NPN low-noise transistor and the PMOS transistor are adopted to design the low-noise band-gap reference current circuit, substrate noise, 1 / f flicker noise and far-end phase noise introduced by the NMOS transistor are reduced, and the precision is high.

This invention relates to a high-voltage, capacitor-free, low-noise linear regulator. It comprises a high-voltage switching voltage follower, a self-zeroing error amplifier, and voltage divider resistors. The high-voltage switching voltage follower significantly enhances the system's transient response to load changes and improves power supply rejection in the mid-frequency range. The self-zeroing error amplifier, together with the high-voltage switching voltage follower, forms a global slow loop. The self-zeroing error amplifier employs a ping-pong self-zeroing method, effectively reducing low-frequency flicker noise and offset while ensuring continuous operation in the time domain. This invention introduces a settling phase between the self-zeroing and amplification phases of the ping-pong module, significantly reducing output glitches caused by amplifier settling time. This invention operates stably without an external output capacitor, supports a wide input and output voltage range, and possesses excellent characteristics such as low noise, high power supply rejection, and fast response, making it suitable for various demanding high-voltage power supply applications.

The invention discloses a high-sensitivity and high-precision continuous CV conversion circuit, which comprises a signal modulator module, a capacitance differentiator module, a pseudo resistor module, a capacitance-voltage conversion operational amplifier module and a demodulator module, and is characterized in that the output end of the signal modulator module is connected with the modulation end of an MEMS sensor; the output end of the MEMS sensor, the output end of the capacitance differentiator module and the input end of the capacitance-voltage conversion operational amplifier module are connected, and the output end of the pseudo resistor module is connected with the positive and negative input ports of the core operational amplifier. The output end of the capacitance-voltage conversion operational amplifier module, the input end of the pseudo resistor and the input end of the demodulator module are connected. According to the invention, the gain error problem, the temperature drift problem, the flicker noise problem, the thermal noise problem and the error charge problem of the capacitance-voltage conversion circuit can be suppressed, and the CV conversion precision is improved. The high-sensitivity and high-precision continuous CV conversion circuit can be widely applied to the technical field of hardware conversion circuits.

This invention relates to the field of integrated circuit manufacturing technology and discloses a digital self-calibration circuit and method for a SAR ADC capacitor array. In the process of integrated circuit manufacturing and on-chip analog-to-digital conversion circuit implementation, by causing the target capacitor to generate excitations with opposite polarities and corresponding amplitudes in odd-numbered and even-numbered calibration cycles, the DC offset components of the comparator cancel each other out during the difference calculation. By generating bit decisions through multiple statistical methods for the comparison results of each bit of the sub-ADC, the disturbance of thermal noise to the final calibration result is reduced at the bit decision level. By alternating between odd and even calibration cycles and performing pairing and difference calculation in a short time, the influence of flicker noise in adjacent calibrations is reduced. By solving the capacitor weights of each bit sequentially from low to high bits, the propagation of errors at each level is reduced. By digitally reconstructing the output result after all weights have been solved, the final output of the SAR ADC is made closer to the actual capacitor array weight relationship.

The invention belongs to the technical field of aerospace, and particularly relates to a robust aerodynamic parameter estimation method based on variational Bayesian inference. A traditional scheme, such as a smoothing method of a smoother, for estimating the optimal performance of aerodynamic parameters is often based on the assumption that measurement noise meets Gaussian distribution. However, in practical applications, noise distribution often deviates from Gaussian hypothesis, for example, heavy tail density may occur in applications involving flicker noise, air turbulence and the like. The factors can cause the Gaussian hypothesis of noise measurement to be invalid, so that the performance can be greatly reduced when aerodynamic parameters are estimated based on a filter or smoother method. According to the method, the measurement noise is modeled by using the zero-mean Pearson type VII distribution, the novel, simple and easy-to-implement aircraft aerodynamic parameter estimation method is provided by means of a variational Bayesian inference method, and the requirements of the aerospace field on high-precision estimated values of aircraft aerodynamic parameters are met.

Methods, systems, and devices for wireless communications are described. The described techniques may enable receiving devices to reduce flicker noise and signal distortions around a resource block allocation by applying a frequency offset to adjust a local oscillator frequency of the receiving device. The receiving device may predict that the resource block allocation may fall within a threshold frequency distance from the local oscillator frequency based on one or more previous resource block allocations (or one or more previous control channel decodes) falling within a threshold time duration prior to the resource block allocation. The receiving device may perform fast frequency hopping and apply the frequency offset such that the adjusted local oscillator frequency is non-overlapping with the at least one resource block allocation. The receiving device may adjust a frequency of a received signal based on the applied frequency offset, and may receive one or more downlink messages.

The application discloses a kind of based on global chopping's analog-digital converter unbalance voltage and the suppression system of flicker noise, including ADC main body circuit, clock frequency division circuit, input modulation circuit, output demodulation circuit, wave filter.Through input modulation circuit cooperation clock frequency division circuit generation phase synchronization sampling clock and chopping clock, periodically global polarity flip modulation is carried out to input signal in analog domain, then is realized spectrum rearrangement by digital end synchronous demodulation, will ADC whole link inherent direct current unbalance voltage, low frequency 1 / f flicker noise shift to chopping frequency and its odd high frequency harmonic place, finally, high-frequency noise component is filtered by digital mean filter mode, realize low-frequency band error global cancellation.The application does not introduce non-linear error, with low power consumption, small chip area, wide temperature range adaptability, long-term work stability is high The characteristics of, be applicable to high-resolution, precision sensor signal acquisition, low-frequency weak signal detection, aerospace deep space data acquisition and other high-precision application scenarios.

The invention relates to a capacitive touch detection device which comprises a capacitive touch device and a touch detection chip connected with the capacitive touch device. The touch detection chip comprises a capacitance detection module and a calculation unit connected with the capacitance detection module; the capacitive touch device is configured to convert a touch action into a capacitance change signal and send the capacitance change signal to the touch detection chip; and the touch detection chip is configured to sense the capacitance variation of the capacitive touch device through the capacitance detection module, and then obtain a final capacitance value through the calculation unit. According to the invention, the self-capacitance is discharged twice through the two resistors, the discharge resistances of the two times of discharge are different, so that two different discharge curves are obtained, and the relative value of the ground sub-capacitance is obtained through the difference of the two discharge curves. The scheme of two resistors is simple in structure and simple in control time sequence; the low-frequency noise (such as flicker noise) can be effectively suppressed through subtraction of two discharge curves.

The invention relates to the technical field of sensing circuits, and provides a high-performance front-end instrumentation amplifier circuit and a resistive sensing circuit, the high-performance front-end instrumentation amplifier circuit comprises a differential amplifier, a chopping modulation circuit, a ripple reduction loop and a pre-charging loop; the input end of the differential amplifier is connected to the resistive sensor, and the differential amplifier amplifies the input signal; the chopping modulation circuit is connected to the input end and the output end of the differential amplifier and is used for modulating and demodulating the input signal and the output signal; the ripple reduction loop is bridged between the chopping modulation circuit and the input end of the differential amplifier and is used for reducing output ripples caused by chopping modulation; and the pre-charging loop is bridged at the input end of the differential amplifier and is used for improving the input impedance. According to the technical scheme, flicker noise and direct current offset are effectively reduced, the influence of output ripples brought by chopping modulation is reduced, input impedance is improved, and completeness and effectiveness of signal acquisition are guaranteed.

A calibration apparatus and method for nonlinear mismatch in a differential MEMS resonant accelerometer are disclosed. The apparatus includes a differential MEMS resonant accelerometer, a calibration control circuit, and a test signal generator. The differential MEMS resonant accelerometer has identical first and second channels. This invention suppresses flicker noise introduced by nonlinear stiffness mismatch between the two channels of the differential MEMS resonant accelerometer due to manufacturing defects, thereby further improving the performance of the differential MEMS resonant accelerometer. This invention suppresses flicker noise introduced by nonlinear stiffness mismatch without changing the mechanical architecture of the differential MEMS resonant accelerometer and maintains its high bandwidth and high signal-to-noise ratio characteristics.

The present invention discloses a device for measuring flicker noise of MOS devices. An input bias drive circuit provides a DC bias voltage to a MOS transistor to be tested so that the MOS transistor to be tested is in a linear working region. The input bias drive circuit includes a gate drive branch that provides a DC bias voltage to the gate of the MOS transistor to be tested; the gate drive branch includes a capacitor voltage divider unit composed of a plurality of capacitors connected in series to ground, and a switch five; the switch five is a single-pole multi-throw switch, and the plurality of throws are respectively connected to different positions in the capacitor voltage divider unit, and different closed states of the switch five provide different gate voltage values ​​for the gate of the MOS transistor to be tested. A back-end noise signal processing circuit is connected to the target position of the MOS transistor to be tested, and is used to measure and analyze the flicker noise of the target position of the MOS transistor to be tested. The present invention can stabilize the gate voltage and reduce the influence of gate flicker noise and other noise inputs on the entire test system.

The invention provides an LDO circuit. The LDO circuit comprises a chopping stabilization error amplifier, a first transistor and a feedback loop. The chopping stabilization error amplifier comprises an in-phase input end, an inverted input end, a current bias end, a first voltage bias end, a second voltage bias end, a third voltage bias end, a clock end, a power supply end, a reference ground end and an output end. The inverted input end of the chopping stabilization error amplifier is connected with reference voltage, the current bias end is connected with external bias current, the first to third voltage bias ends are correspondingly connected with three bias voltages respectively, the clock end is connected with a chopping clock source, the power end is connected with a power supply, and the reference ground end is grounded; the grid electrode of the first transistor is connected with the output end of the chopping stabilization error amplifier, the source electrode of the first transistor is connected with a power supply, and the drain electrode of the first transistor serves as the output end of the LDO circuit and is connected to the in-phase input end of the chopping stabilization error amplifier through the feedback loop. According to the invention, flicker noise can be reduced.

The application provides a detector microphonic noise suppression method and system, and relates to the field of radiation detection. The method comprises the following steps: receiving an output signal of a detector by a detector signal conditioning circuit and separating a microphonic noise signal from the output signal; processing the microphonic noise signal by an adaptive microphonic noise suppression system running an adaptive noise suppression algorithm, wherein the microphonic noise signal is used as an error signal in the adaptive noise suppression algorithm, and a vibration adjustment signal is output to a vibration absorber driving circuit when the error signal does not satisfy a preset minimization condition in the adaptive noise suppression algorithm; and adjusting the vibration of a vibration absorber installed in the detector according to the vibration adjustment signal by the vibration absorber driving circuit. The application also provides a detector comprising a detector microphonic noise suppression system. The application directly aims at minimizing the microphonic noise in the output signal of the detector, can effectively suppress the microphonic noise in the detector to a certain extent, and has a simple structure.

Devices having impedance measurement circuits that allow for flicker noise reduction can be implemented in a variety of applications. Carrier suppression techniques can be implemented to remove noise artifacts associated with the carrier signal from its sidebands, thereby substantially removing the carrier signal. Carrier suppression in an AC impedance measurement circuit can be achieved by sensing the carrier signal of the measurement circuit at a transmit location of the measurement circuit and subtracting a weighted version of the carrier signal at a receive location of the measurement circuit. One or more compensating impedances can be used to allow the carrier signal's sidebands to be received with the carrier signal suppressed relative to the receive location.

The invention provides a semiconductor device structure and a preparation method thereof, and relates to the technical field of semiconductors, the semiconductor device structure comprises a substrate, a bottom doped region, a drift region, a first doped region and a second doped region, and the drift region is adjacent to the upper part of the bottom doped region; the first doped region is located at one side of the bottom doped region and the drift region and is in contact with the drift region and the bottom doped region, and a first gate connection region is formed at the top of the first doped region; the second doped region is located in the drift region and is spaced from the bottom doped region in the direction perpendicular to the substrate, and a second gate connection region is formed at the top of the second doped region. Compared with the prior art, the embedded conducting channel can be formed, flicker noise can be greatly reduced, meanwhile, device parameters are more stable, and long-term reliability is better. Moreover, the second doped region and the bottom doped region can form a buried shielding layer together, so that the electric field distribution can be optimized, the short-channel effects such as DIBL can be effectively inhibited, and more ideal switching characteristics can be obtained.

The invention discloses a high-performance analog front-end circuit applied to a piezoelectric sensor. The circuit comprises a chopping capacitor transimpedance rail-to-rail output operational amplifier circuit, a servoloop circuit module, a piezoelectric sensor modeling circuit, a buffer circuit and a two-phase non-overlapping clock generation circuit. Wherein the two-phase non-overlapping clock controls the chopping modulation switch to suppress low-frequency flicker noise; a cascode current mirror bias source follower of the servop module outputs nA-level current to compensate input leakage current, high output impedance of the cascode current mirror bias source follower and a Miller capacitor generate a secondary pole, and the lower limit cut-off frequency is reduced to the 0.026 Hz level; and the buffer circuit enhances the driving capability of the amplifier. The device can realize low noise, low lower limit cut-off frequency and leakage current compensation, reduces cost and power consumption, improves stability, and is suitable for measurement of vibration, pressure, acceleration and other physical quantities of the piezoelectric sensor.

A system for audio segmentation for context change detection in speech is disclosed. The system accesses a speech signal of a user and identifies the user based on the voice print associated with the user. The system detects a potential context change between a first audio frame and a second audio frame of the speech signal. The system splits the speech signal into a first set of split audio frames based on the potential context change. The system generates a noisy speech signal by modulating a flicker noise signal into the speech signal. The system splits the noisy speech signal into a second set of split audio frames. The system detects a difference between the first and second sets of split audio frames. The system reconfigures a modulation of the speech signal with the flicker noise signal to reduce the difference between the first and second sets of audio frames.

The invention relates to a flicker-noise-free band-gap reference voltage generator circuit. The bandgap voltage generator circuit is formed using only bipolar transistors. The bandgap voltage generator circuit includes an output node at which a bandgap reference voltage is generated. A transconductance amplifier circuit in the current control feedback loop has a differential input that receives a base current. The compensation current sink circuit operates to sink, from the output node, a compensation current corresponding to a base current received at a differential input of the transconductance amplifier.

Systems and methods for scalable digital beamforming and low power analog amplification are provided. Various embodiments of the present technology provide systems and methods for achieving efficient data distribution and superior signal integrity in multi-chip sensor arrays. Embodiments of the digital beamforming architecture utilizes a plurality of chiplets where sampled analog-to-digital converter bitstreams are distributed wirelessly via low power short-range transmitters in an inherently broadcast manner, thereby achieving scalable interconnectivity complexity. Embodiments include a system and method that uses a multi-stage, multi-path feed-forward compensated operational amplifier configured with a non-idealities reduction loop that employs chopping to frequency-translate and suppress low-frequency non-idealities, such as flicker noise and offset voltage, enabling power- efficient data conversion circuitry like continuous-time sigma delta ADCs.

The invention provides a method and system for removing background noise and flicker noise in a flicker scene step by step, and the method comprises the steps: marking the possibility that each pixel has an event at each moment through the intensity information of light in the scene and the angular velocity information of a camera obtained by an IMU (Inertial Measurement Unit); acquiring event data generated by an event camera, wherein the event data comprises a spatial position, a timestamp and polarity of an event; taking the difference between the timestamp of the event recently generated by each pixel and the timestamp of the marked event as an input feature vector, encoding the input feature vector into a plurality of channels, and inputting the trained background noise removal neural network to remove background noise; estimating a real brightness change threshold value cp and a deviation bp, and correcting the event from which the background noise is removed through the estimated cp and bp, the corrected event comprising flicker noise; modeling the corrected event into a time domain signal; and using a flicker noise removal filter to remove flicker noise in the corrected event. According to the invention, background noise and flicker noise can be removed step by step.

The application discloses a flicker noise filtering system. To solve the flicker noise problem caused by the flickering light source, the flicker noise filtering scheme disclosed by the application is as follows: a first event is received, the time difference between the first event and the previous event of the first event is obtained according to the timestamp of the first event and the timestamp of the previous event of the first event; the size relationship between the time difference and a first threshold value is judged, and the result representing the size relationship is written into a first position in a first list corresponding to the first event in a first storage space; whether the first event is flicker noise is judged according to a plurality of results representing the size relationship stored in a plurality of positions of the first list corresponding to the first event in the first storage space. The application takes the list recording time difference discrimination results as a technical means, solves the flicker noise problem, and obtains the low-power-consumption, low-delay and high-performance noise reduction effect. The application is suitable for the field of event cameras and brain-like computing.