12 results about "Flicker noise" patented technology

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.

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.

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.

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 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.

This application discloses a display device and a backlight control method. The signal acquisition module includes a light-collecting unit for collecting ambient light intensity to generate a light detection signal; a signal amplification module for spectral shifting and amplification of the light detection signal followed by demodulation to obtain an amplified signal; a display resolution module for obtaining the average brightness of the image to be displayed on the display panel based on the image data; and a backlight control module for adjusting the brightness of the backlight provided by the backlight module to the display panel based on the amplified signal and the average brightness. By spectrally shifting and amplifying the light detection signal to obtain the amplified signal, the flicker noise of the signal amplification module itself can be reduced during the amplification process, improving the signal-to-noise ratio of the amplified signal and thus enhancing the accuracy of the backlight control module in adjusting the backlight brightness based on the amplified signal and the average brightness.

An IR thermopile sensor and a method of manufacturing the same. In the IR thermopile sensor, a substrate defines an annular first groove provided therein with a thermal conductivity enhancement layer made of an electrically conductive material. A plurality of thermocouple components are spaced apart from one another above an insulating layer and a support layer extend from above the thermal conductivity enhancement layer towards the inside of an internal annular wall of the first groove. The additionally included thermal conductivity enhancement layer can stabilize the temperature of cold ends of the thermocouple components and reflect IR radiation, helping maintain cold junctions at the same temperature as the ambient temperature. Thus, a temperature gradient can be more easily established across hot and cold ends, resulting in improved performance. The thermal conductivity enhancement layer can be made of a material, which is selected to make the present invention easy to implement in terms of structure. Additionally, since the only cost increase is caused by the thermal conductivity enhancement layer, facilitating commercial large-scale production. The insulating layer is disposed between the thermal conductivity enhancement layer and the thermocouple components and can reduce flicker noise in signals output from the IR thermopile sensor.

A 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 a current control feedback loop has a differential input which receives a base current. A compensation current sink circuit operates to sink a compensation current from the output node corresponding to the base current received at the differential input of the transconductance amplifier.

In some embodiments, an optical communication system may include a light source, a modulator, and an optical receiver. The light source may be configured to generate a beam comprising a series of light pulses. The optical receiver may have a detection window duration of 1 nanosecond or less. As the first pulse travels through a variable refractive medium, photons in the first pulse may be refracted, thus traveling along different ray paths to reach the optical receiver according to a time distribution curve. The full width at half maximum (FWHM) value of the time distribution curve may be greater than the coherence time value of the first pulse, and the detection window of the optical receiver may be greater than the FWHM value of the time distribution curve.

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 relates to a method for preparing a metal oxide semiconductor (MOS) device, the prepared MOS device and application thereof, and the method comprises the following steps: S1, forming a gate oxide layer on a substrate, and then forming a polycrystalline silicon layer on the gate oxide layer; s2, respectively forming a source electrode and a drain electrode in the substrate at two sides of the gate oxide layer to obtain a first device; s3, first ion implantation is carried out on the first device, the implanted ions are fluorine, and a second device is obtained; and S4, performing first annealing treatment on the second device. The MOS device prepared by adopting the method disclosed by the invention has relatively low flicker noise.

This invention discloses a method for denoising event data based on triple polarity attenuation, belonging to the field of image sensor technology. The method targets background activity noise and flicker noise in event camera output data by constructing and dynamically maintaining three two-dimensional weight maps: positive polarity, negative polarity, and polarity change, to simulate the spatiotemporal distribution characteristics of event data. The steps include: acquiring event data; performing global attenuation on the three weight maps; updating the corresponding polarity weight map locally based on the current event polarity, enhancing the center and attenuating the neighborhood; updating the polarity change weight map by enhancing or attenuating it depending on whether the polarity changes; and finally, performing dual threshold judgment based on the updated weight maps to accurately distinguish between real signals and noise and remove noise. This invention achieves low-latency denoising through event-by-event processing, effectively preserving scene details, significantly improving the quality of event data, and is suitable for high dynamic range visual tasks.