206 results about "Noise figure" patented technology

Devices and methods enable optimizing a signal of interest based on identifying and analyzing the signal of interest based on radio frequency energy measurements. Signal data is compared with stored data to identify the signal of interest. Signal degradation data is calculated based on noise figure parameters, hardware parameters and environment parameters. The signal of interest is optimized based on the signal degradation data. Terrain data is also operable to be used for optimizing the signal of interest.

Systems, methods, and devices enable spectrum management by identifying, classifying, and cataloging signals of interest based on radio frequency measurements. Signal data is compared with stored data to identify the signal of interest. Signal degradation data is calculated based on noise figure parameters, hardware parameters and environment parameters.

Apparatus and methods for identifying a wireless signal-emitting device are disclosed. The apparatus is configured to sense and measure wireless communication signals from signal-emitting devices in a spectrum. The apparatus is operable to automatically detect a signal of interest from the wireless signal-emitting device and create a signal profile of the signal of interest; compare the signal profile with stored device signal profiles for identification of the wireless signal-emitting device; and calculate signal degradation data for the signal of interest based on information associated with the signal of interest in a static database including noise figure parameters of a wireless signal-emitting device outputting the signal of interest. The signal profile of the signal of interest, profile comparison result, and signal degradation data are stored in the apparatus.

A ladder type acoustic wave filter is disclosed. The acoustic wave filter can include a plurality of parallel arm resonators and a plurality of series arm resonators, in which an electromechanical coupling coefficient of a parallel arm resonator closest to an input node of the acoustic wave filter among the plurality of parallel arm resonators can be smaller than an electromechanical coupling coefficient of a series arm resonator closest to the input node among the plurality of series arm resonators.

Certain aspects of the present disclosure are directed towards techniques and apparatus for implementing concurrent matching for a transmitter and a receiver. An example transceiver may include: a transformer having a primary winding and a secondary winding; a first amplifier having a first output coupled to the primary winding; a second amplifier having an input coupled to a first terminal of the secondary winding, wherein a second terminal of the secondary winding is coupled to an antenna port of the transceiver; and a first inductive element coupled between the first terminal of the secondary winding and a reference potential node.

A measurement system for determining a noise figure of a device under test is described. The measurement system determines a first total error power based on the output signal by a first noise canceling technique, wherein the first total error power includes systematic errors originating in the device under test and in the measurement system. The measurement system determines a second total error power based on the output signal by a different, second noise canceling technique. The second total error power includes systematic errors originating in the measurement system. The second total error power further includes noise originating in the device under test and in the measurement system outside of the measurement instrument. The measurement system is configured to subtract the first total error power from the second total error power, thereby obtaining an external noise power.

This invention relates to the field of data processing, and more particularly to an oscilloscope signal data processing method and system for bearing testing. The method involves acquiring bearing vibration data using an oscilloscope, extracting data from a first time moment for frequency domain analysis, obtaining its power spectrum, and dividing it into frequencies to obtain a first frequency sequence. Similarly, a second frequency sequence is obtained from the data at a second time moment. Aligning the two frequency sequences yields frequency matching pairs. Utilizing the frequency variations of neighboring frequencies within a single matching pair, the noise figure of each frequency in the matching pair is calculated, resulting in the noise figure for any frequency in the first frequency sequence. Based on these noise figures, a first mean sequence is constructed. The distribution consistency of each frequency point in the first mean sequence is obtained, and the segmentation effectiveness of each frequency point is calculated. Combined with a noise segmentation threshold, oscilloscope signal processing is completed. This invention denoises bearing vibration data acquired by an oscilloscope, improving the accuracy of the denoised oscilloscope signal data.

The utility model provides a kind of electrostatic discharge protection circuit and low noise amplification module, the electrostatic discharge protection circuit is applied to low noise amplification circuit, the low noise amplification circuit includes input matching circuit and the low noise amplifier of the output end being connected to the input matching circuit;The electrostatic discharge protection circuit includes inductance and resistance;The first end of the inductance is used to connect to the signal input end of low noise amplifier;The first end of the resistance is connected to the second end of the inductance, and the second end of the resistance is grounded.The electrostatic discharge protection circuit in the utility model is connected to the input end of low noise amplifier, and the noise coefficient of low noise amplifier will not be deteriorated, and the performance of low noise amplifier will not be affected, and the input stability of low noise amplifier will not be affected simultaneously.

Circuits and methods for providing ESD protection, particularly for LNAs lacking a DC blocking input capacitor (“capless LNAs”). Novel circuitry provides both improved ESD protection and an improved Noise Figure compared to conventional designs. One embodiment includes an integrated circuit including a voltage source pin and a plurality of low-noise amplifiers lacking a respective DC blocking input capacitor, each of the plurality of low-noise amplifiers including: a voltage source terminal coupled to the voltage source pin, an input terminal configured to receive a signal to be amplified, an output terminal configured to output an amplified version of the received signal to be amplified, an ESD protection circuit coupled to the input terminal and to both the voltage source terminal and a reference potential, and a distributed ESD clamp coupled between the reference potential and a node located between the ESD protection circuit and the voltage source terminal.

According to the receiver noise coefficient testing method based on high-precision radiation measurement, a calibration source outputs different brightness temperature signals to calibrate a receiver in real time, and high-precision measurement of the noise coefficient of the receiver can be achieved by calculating the equivalent noise temperature. An actual brightness temperature scene is integrally simulated, the radiation measurement method is more accurate, and the test precision is improved; the calibration source realizes accurate and stable cold source and heat source based on liquid nitrogen refrigeration and physical heating, and has the advantages of high output precision, long stabilization time and the like, and the long-time stabilization precision can reach 0.1 k / 3 days; and meanwhile, the output brightness temperature of the high-precision calibration source is between 90K and 330K and is closer to an actual brightness temperature scene, so that a relatively large nonlinear error caused by nonlinearity of an internal amplifier of the receiver can be avoided, and the test precision is greatly improved.

A variable-gain multistage broadband low-noise amplifier comprises N (N > = 2) stages of amplifying circuits, the first stage of amplifying circuit and the second stage of amplifying circuit are connected through a first inter-stage matching circuit, a main circuit switch and an inter-stage matching circuit are sequentially connected between the subsequent stages of amplifying circuits in series, the input end is connected with an input matching circuit in series to be connected to the first stage of amplifying circuit, and the second stage of amplifying circuit is connected with a second stage of amplifying circuit. The Nth-stage amplification circuit is connected in series with a main switch and an output matching circuit in sequence to a signal output end; from the second stage, each stage of amplifying circuit and the main switch are integrally connected with a bypass switch in parallel; a source degeneration inductance scheme is adopted for input matching, and the noise performance is optimized; the overall gain flatness is improved through inter-stage matching; a multi-stage LC structure is adopted for output matching, and broadband matching in different gain modes is achieved; according to the invention, control of each switch is realized through logic level signals, switching of multiple gain modes is realized, the designed bandwidth reaches more than 10GHz, and the overall gain flatness and the noise coefficient in different gain modes are kept consistent.

The invention discloses an automatic temperature compensation traveling wave low-noise amplifier and a chip, and belongs to the technical field of low-noise amplifiers. The amplifier comprises a plurality of high-frequency attenuation amplification modules which are connected in parallel, a grid electrode absorption load, a grid voltage temperature compensation bias module, a drain electrode absorption load and a drain voltage temperature compensation bias module. According to the low-noise amplifier, automatic temperature compensation at different temperatures is achieved, the change of the gain and the noise coefficient of the amplifier along with temperature fluctuation is reduced, and the stability of the amplifier is improved; according to the low-noise amplifier, an additional temperature compensation circuit module is not needed, the system integration degree is improved, the redundant design of equipment is reduced, and therefore the reliability of the equipment is improved; according to the low-noise amplifier, the high-frequency attenuation module effectively reduces gain fluctuation, and the high-frequency stability of the circuit is improved.

The invention discloses a broadband low-noise amplifier, and belongs to the technical field of monolithic microwave integrated circuits. Comprising a current multiplexing structure low-noise amplifier and a balanced low-noise amplifier which are cascaded, the current multiplexing low-noise amplifier comprises a first-stage amplification circuit and a second-stage amplification circuit which are cascaded in sequence, the balanced low noise amplifier comprises two folding Lange couplers and two amplification branches, the two amplification branches are of the same two-stage amplification circuit structure and comprise a third-stage amplification circuit and a fourth-stage amplification circuit which are cascaded and have the same structure; pHEMT (Pseudomorphic High Electron Mobility Transistor) tubes are adopted as amplifying devices in each amplifying circuit, and the broadband low-noise amplifier is integrated on a monolithic gallium arsenide. By combining the current multiplexing technology, the Lange coupler folding technology, the negative feedback technology and the balanced structure, the noise coefficient is effectively reduced, the power consumption is reduced, the layout area is reduced, and the performance of a traditional balanced low-noise amplifier is improved.

The invention discloses a defect coupling low-noise amplifier. The low-noise amplifier solves the problem that the performance of a low-noise amplifier in the prior art is influenced by a grid source inductance coupling coefficient. Forward coupling of an input inductor and a grid inductor and reverse coupling of the input inductor and a source inductor are achieved through a unique defect coupling transformer matching network, meanwhile, reverse coupling of a grid inductor and the source inductor is achieved, and the coupling coefficient of the grid-source inductor is reduced through coupling counteracting inductance; by combining a differential common-source transconductance amplification stage, a four-order magnetic coupling resonance unit, a differential transconductance amplification stage with a neutralizing capacitor and an output transformer matching network, the characteristics of high gain bandwidth and low noise are realized; simulation and actual tests verify that the low-noise amplifier can effectively reduce the noise coefficient and broaden the input matching range, has good compatibility and wide application prospects based on a conventional integrated circuit production process, can be applied to a phased array system, and can also form a receiver system with other circuits.

The present invention discloses a method for calibrating the clock of an SOC chip based on a 2.4GHz signal in the air, belonging to the technical field of chip clock calibration. The method for calibrating the clock of an SOC chip based on a 2.4GHz signal in the air includes the following specific steps: Step 1: 2.4GHz signal reception and preprocessing: A miniaturized ceramic patch antenna is used, and an integrated low-noise amplifier (LNA) is used to amplify the signal to above -20dBm, with a noise figure ≤ 3dB. The 2.4GHz carrier is down-converted to the baseband through a quadrature mixer, and the image interference is suppressed by a 10MHz low-pass filter. The present invention does not require an external crystal oscillator design for calibrating the clock of the SOC chip through a 2.4GHz signal, and completely relies on the wireless signal in the air to achieve clock synchronization. At the same time, it experiments with multi-protocol compatibility: supports 2.4GHz protocols such as Wi-Fi 802.11b / g / n, Bluetooth 5.0, and ZigBee, and automatically adjusts the calibration period and compensation strategy according to the signal quality.

The invention discloses a wide dynamic range frequency-selecting ultrahigh frequency conditioning method and system based on logarithmic detection, and relates to the technical field of high-voltage electrical equipment partial discharge detection, and the method comprises the steps: capturing a signal, and transmitting the signal to a conditioning circuit; a required path is controlled to be conducted based on the logic control circuit; filtering out-of-band noise signals and carrying out logarithmic detection. The circuit structure is clear and simple, ultrahigh frequency signals are analyzed by selecting different frequency band ranges, external interference is effectively removed, the detection sensitivity is higher, and the detection result is more accurate. The design of logarithmic detection after band-pass filtering avoids the problem of output nonlinearity caused by large signal input outside the frequency band, and effectively protects the device. According to the frequency band range characteristics of interference signals, a corresponding filter network is arranged on the frequency-selecting switch, and the detection frequency band is changed according to the field environmental noise. The signal is subjected to second band-pass filtering before entering the logarithmic detection circuit, so that the noise coefficient of the whole link is effectively reduced, and the influence of a noise signal newly generated by the conditioning circuit is reduced.

The invention discloses an SOC chip clock calibration method based on an air 2.4 GHz signal, and belongs to the technical field of chip clock calibration. The SOC chip clock calibration method based on the air 2.4 GHz signal comprises the following specific steps: step 1, 2.4 GHz signal receiving and preprocessing: adopting a miniaturized ceramic patch antenna, and using an integrated LNA (low noise amplifier) to amplify the signal to be more than-20dBm, the noise coefficient is less than or equal to 3dB, the 2.4 GHz carrier wave is down-converted to a base band through an orthogonal frequency mixer, and mirror image interference is inhibited through a 10MHz low-pass filter. According to the method, SOC chip clock calibration is carried out through 2.4 GHz signals, external crystal oscillator design is not needed, clock synchronization is achieved completely depending on air wireless signals, meanwhile, multi-protocol compatibility is tested, 2.4 GHz protocols such as Wi-Fi 802.11 b / g / n, Bluetooth 5.0 and ZigBee are supported, and the calibration period and the compensation strategy are automatically adjusted according to signal quality.

The invention relates to the technical field of optical test analysis, in particular to an intelligent water quality monitoring method, system and device based on data analysis, and the method comprises the steps: carrying out the iterative decomposition of original spectral data to obtain a component signal tree, and analyzing the extreme point distribution characteristics of data points in any component signal in the component signal tree; calculating spectral noise factors of the component signals according to the number difference corresponding to the extreme points and the data points among the different component signals; combining the spectral noise factors of all the component signals and the amplitude difference and frequency information in the component signals, performing similarity analysis on the component signals and the original spectral data, obtaining an updated noise coefficient of the original spectral data, denoising the original spectral data, and obtaining a water quality monitoring result of the water body sample by using new spectral data. According to the invention, the denoising effect on the spectral signal is improved, and the accuracy of the water quality monitoring result is further improved.

This invention provides an OTFS peak-to-average power ratio (PAPR) suppression method, apparatus, electronic device, and readable storage medium for high-reliability transmission, applied in the field of wireless communication technology. The method includes: embedding a pilot signal into an OTFS delay-Doppler domain signal frame and setting a guard interval to obtain an initial delay-Doppler domain transmitted signal; performing amplitude-limiting filtering on the transmitted signal to obtain amplitude-limited filtered noise; obtaining approximately iteratively ...

Systems, methods, and devices enable spectrum management by identifying, classifying, and cataloging signals of interest based on radio frequency measurements. Signal data is compared with stored data to identify the signal of interest. Signal degradation data is calculated based on noise figure parameters, hardware parameters and environment parameters.

The present invention provides a high-frequency module and a communication device capable of suppressing deterioration of the noise figure of a low-noise amplifier. The high-frequency module (1) includes a mounting substrate (2), a low-noise amplifier (12), an input switch (20), and a matching circuit (30). The input switch (20) is connected to the input terminal of the low-noise amplifier (12). The matching circuit (30) achieves impedance matching between the input switch (20) and the low-noise amplifier (12). The matching circuit (30) is disposed on the first main surface (21) in the first direction (D1) of the mounting substrate (2). The input switch (20) and the low-noise amplifier (12) are disposed on the second main surface (22) opposite to the first main surface (21). When the mounting substrate (2) is viewed from above, at least a part of the input switch (20) overlaps with the matching circuit (30).

This invention discloses a method and system for testing the noise figure of frequency converter devices. The method includes: constructing a parameter configuration model for the noise figure testing system of frequency converter devices; wherein the objects of parameter configuration include the device under test (DUT) and the noise figure testing instrument; configuring the parameters of different parameter configuration objects according to the type of DUT to form different noise figure testing modes for different types of DUTs; and completing the noise figure testing of different types of DUTs based on different noise figure testing modes. Simultaneously, before performing the noise figure testing of the DUT, a calibration method for the frequency converter device noise figure testing system is also included. This invention supports noise figure testing of single frequency converter devices and cascaded frequency converter links with various frequency conversion mechanisms, solving the problems of complex measurement modes, difficult parameter configuration, and low testing efficiency in existing frequency converter device noise figure testing, simplifying the calibration method, and saving testing time for various types of frequency converter devices.

The present invention discloses a broadband high-gain low-noise amplifier, comprising: an amplifier stage circuit, a buffer stage circuit, an output stage circuit, and a feedback circuit. The amplifier stage circuit sequentially generates an output signal through the buffer stage circuit and the output stage circuit. The amplifier stage circuit adopts a cascode resistor feedback amplifier structure, which includes a cascode amplifier, a field-effect transistor M1, and a feedback resistor Rf. The gate of the field-effect transistor M1 is used to connect to the input signal, the source of the field-effect transistor M1 is grounded, and the drain of the field-effect transistor M1 is connected to the cascode amplifier. The present invention can achieve broadband matching while meeting high gain and low noise coefficient, and simultaneously achieves input and output matching. The input and output do not require a matching network structure, are simple to use, and adopt a design without inductance components to reduce cost and chip area.

Devices and methods enable optimizing a signal of interest based on identifying and analyzing the signal of interest based on radio frequency energy measurements. Signal data is compared with stored data to identify the signal of interest. Signal degradation data is calculated based on noise figure parameters, hardware parameters and environment parameters. The signal of interest is optimized based on the signal degradation data. Terrain data is also operable to be used for optimizing the signal of interest.

The utility model discloses a power supply driving device for an external noise source and a noise coefficient testing system. The power supply driving device comprises a shell, a USB (Universal Serial Bus) connecting interface, a switch logic control module, a power supply management module and a switch circuit, the switch logic control module is used for establishing communication connection with an upper computer through the USB connection interface and responding to a switch control instruction output by the upper computer to send a switch control electric signal to the switch circuit, and the power management module is used for converting a direct-current power supply of the USB interface of the upper computer into a target level signal and then outputting the target level signal to the switch circuit. And the switch circuit is used for responding to the switch-on or switch-off of the switch control electric signal so as to send a driving pulse electric signal to the external noise source. The power supply driving device of the USB interface sends the driving pulse electric signal to the external noise source, so that the spectrum analyzer without a special noise source interface can be used in a noise coefficient test system, and the application scene of the spectrum analyzer is expanded; and different external noise sources can be flexibly replaced so as to adapt to different devices to be tested.

The present invention discloses a low dry-to-noise ratio interference detection method and a positioning method based on a multi-beam double-star system, including: determining the interference frequency according to the main satellite interference, and establishing an interference model of the main satellite interference and the secondary satellite interference based on this; performing matched filtering on the interference forwarded by the two multi-beam satellites to the ground receiving station to improve the dry-to-noise ratio between the interferences; performing wavelet decomposition on the interference after matched filtering to obtain wavelet coefficients of different scales and frequencies; then determining a threshold, performing threshold processing on the wavelet coefficients to remove the noise coefficients and retain the interference coefficients. Using the retained interference coefficients for wavelet reconstruction to obtain the denoised interference. The present invention breaks through the double-star positioning limitation condition that the double stars need to jointly cover the interference source, and can realize the positioning of the interference source in a vast area, providing an effective tool for the positioning and troubleshooting of the interference source in the multi-beam satellite communication system.

The invention discloses a satellite-borne SAR (synthetic aperture radar) receiver gain distribution method, and belongs to the technical field of satellite-borne SAR receivers. The method comprises the following steps: forming initial gain distribution according to a receiver total gain and a noise coefficient index; the input signal power is increased until the final-stage amplifier reaches a compressed state; adjusting the gain before the front-stage numerical control attenuation to enable the difference between the output of the first-stage low-noise amplifier and a compression point to be greater than or equal to 60dB; adjusting the gain between the pre-stage numerical control attenuation and the post-stage numerical control attenuation to enable the difference between the output of the final-stage amplifier before the post-stage numerical control attenuation and the compression point to be greater than or equal to 30dB; and rechecking the index and repeating the previous steps when the link changes. Through step-by-step progressive gain distribution and adjustment, after the receiver is arranged in the system, the input dynamic range meets the index requirement that the input dynamic range is larger than or equal to 60 dB, meanwhile, a clear linkage relation among receiver input P-1, receiver output P-1 and numerical control attenuation is established, and the technical problem of matching design of the satellite-borne SAR receiver and the system is solved.

The present application belongs to the technical field of radio frequency microwave integrated circuit design, and specifically relates to a wideband full duplex receiver sharing an interference cancellation circuit. The full duplex receiver of the present application is composed of a receiver module and an interference cancellation circuit. The receiver comprises a transconductance, a mixer, a transimpedance amplifier and a frequency conversion loop. The interference cancellation circuit comprises an input matching network, an input down-mixer, a quadrature selection phase shifter and a baseband variable gain low-pass filter. The interference cancellation circuit transfers the adjustment of the delay and gain in the radio frequency domain to the baseband, so that the overall area and power consumption are small, and the delay amount of 3.86-8.33 ns can be realized in a wide radio frequency band of 0.5-3.5 GHz. Meanwhile, the interference cancellation circuit is synthesized by the mixer in the frequency conversion loop of the receiver to form a double-path cancellation mode, which avoids the interference cancellation circuit being directly connected to the front end of the receiver module, and the noise figure deterioration of the receiver module is very small, only 0.9-1.2 dB.

This invention belongs to the field of nasal alar pulse wave signal processing technology, and provides a method, apparatus, medium, and wearable device for nasal alar pulse wave signal processing. The method includes: extracting the respiratory cycle based on the respiratory signal; determining the length of the mean sliding filter window to filter out the DC component of the original nasal alar pulse wave signal, obtaining a filtered nasal alar pulse wave signal; extracting the amplitude of the AC component of the filtered nasal alar pulse wave signal; adjusting the current of the light source element corresponding to the pulse wave signal sensing element to make the amplitude of the AC component of the filtered nasal alar pulse wave signal greater than or equal to a preset amplitude threshold; further filtering the nasal alar pulse wave signal using an adaptive weighted moving average filtering algorithm; and determining whether a nasal alar pulse wave signal meeting preset quality requirements is obtained based on a comparison between the noise figure of the further filtered nasal alar pulse wave signal and a preset noise figure threshold.

The present application discloses a dynamic power consumption management system, comprising: an equalization algorithm circuit, a carrier recovery algorithm circuit, and an IQ imbalance algorithm circuit; an equalization algorithm coefficient update circuit connected to an output end of the carrier recovery algorithm circuit and configured to provide equalization algorithm update coefficients to the equalization algorithm circuit; a carrier recovery frequency offset and phase noise calculation circuit connected to an output end of the equalization algorithm circuit and configured to provide carrier recovery frequency offset and phase noise coefficients to the carrier recovery algorithm circuit; an IQ imbalance algorithm coefficient update circuit connected to an output end of the IQ imbalance algorithm circuit and configured to provide IQ imbalance algorithm coefficients to the IQ imbalance algorithm circuit; a signal-to-noise ratio reporting circuit connected to an output end of the IQ imbalance algorithm circuit and configured to acquire a signal-to-noise ratio of the entire system; and a management circuit configured to determine the equalization algorithm update coefficients, the carrier recovery frequency offset and phase noise coefficients, and the IQ imbalance algorithm coefficients based on the signal-to-noise ratio. The present application can reduce the power consumption of chips.