105 results about "Noise figure" patented technology

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.

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.

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.

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 ...

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.

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 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.

The invention discloses a noise component calculation method and device of a hemispherical resonator gyroscope. The method comprises the following steps: acquiring a test result of the zero-bias stability of the hemispherical resonator gyroscope; carrying out ALLAN variance analysis on the test result of the zero bias stability, and determining a quantization noise coefficient, an angle random walk coefficient, a zero bias instability coefficient, a rate random walk coefficient and a rate slope noise coefficient; and calculating and determining a quantization noise component, an angle random walk noise component, a zero offset instability noise component, a rate random walk noise component and a rate slope noise component according to the quantization noise coefficient, the angle random walk coefficient, the zero offset instability coefficient, the rate random walk coefficient and the rate slope noise coefficient. According to the method, contributions of different noise components in the zero offset error source of the hemispherical resonator gyroscope can be obtained, and the long-term stability and the measurement precision of the hemispherical resonator gyroscope are improved.

The invention discloses a low-noise amplifier circuit design method, a low-noise amplifier circuit and a low-noise amplifier chip. The low-noise amplifier circuit design method comprises the following steps: constructing a small-signal equivalent circuit diagram of a transistor added into a feedback network; obtaining the input impedance and the output impedance of the transistor according to the small signal equivalent circuit diagram; according to the input impedance and the output impedance, obtaining a feedback gain of a transistor added to the feedback network and an intrinsic gain of a transistor without the feedback network, and according to the feedback gain and the intrinsic gain, obtaining a proportionality coefficient; constructing a noise analysis equivalent circuit diagram of the transistor added into the feedback network; obtaining a total noise coefficient according to the noise analysis equivalent circuit diagram, and obtaining an influence coefficient according to the total noise coefficient; and constructing a contour map about feedback parameters of the feedback network according to the proportionality coefficient and the influence coefficient, and analyzing the gain flatness and noise performance of the transistor according to the contour map. According to the invention, a low noise coefficient, a high power gain and an excellent gain flatness index are synchronously realized in an ultra-wide frequency band.

FIELD: microwave electronic devices.SUBSTANCE: in a low-noise microwave field-effect transistor on a semiconductor heterostructure, at least three quantum barrier layers of i-AlAs are additionally made, each with a thickness of 2-6 atomic monolayers, wherein each of said quantum barrier layers is located between the actual channel layer of InyGa1-yAs or a group of layers of the latter and the gate, wherein at least one quantum barrier layer is located between the doped layer and, or δ n-layer and the actual channel layer of InyGa1-yAs or a group of layers of the latter and at least one quantum barrier layer is located between the doped layer and, orδ n-layer and a gate, wherein the quantum barrier layers are separated from each other by at least one layer of narrow-band material AlxGa1-xAs, with a molar fraction of the chemical element Al x less than 0.4, with a thickness equal to or greater than 2 atomic monolayers, or a layer of GaAs, with a thickness equal to or greater than 2 atomic monolayers, between the actual channel layer InyGa1-yAs or a group of layers of the latter and the buffer layer, layers of GaAs, transition layers, quantum barrier layers i-AlAs, barrier layers, and layers doped with an acceptor impurity are made, on the last layer of the group of barrier layers, quantum barrier layers i-AlAs, barrier, transition and contact layers are made in a given sequence.EFFECT: increase in the gain factor and a reduction in the noise figure.1 cl, 1 dwg, 1 tbl

The present disclosure relates to a test and / or measurement system for measuring a noise figure of a device-under-test (DUT). The test and / or measurement system comprises: a test port arranged for being connected to a port of the DUT; an interface unit comprising and amplifier; and a first receiver circuit; wherein, if the test and / or measurement system is operated in a noise figure measurement mode, an input port of the amplifier is electrically connected to the test port and an output port of the amplifier is electrically connected to the first receiver circuit; wherein the interface unit further comprises a biasing circuit which is electrically connected to the output port of the amplifier and is configured to provide a biasing current and / or voltage for the amplifier during operation; and wherein the biasing circuit comprises at least one gyrator circuit.

The present application relates to the field of noise figure measurement, in particular to a noise figure Y-factor correction method suitable for noise source mismatch, comprising: 1: performing standard S parameter test on the measured object to obtain input reflection coefficient and forward transmission parameter of the measured object, and saving as an S2P file; 2: loading a noise source super noise ratio file to extract noise source ENR and on-off state reflection coefficient; 3: calculating Y-factor correction coefficient according to the parameters and according to frequency point by point; 4: performing noise figure calibration to obtain measured Y-factor and noise figure of the noise receiver; 5: performing measured object stage connection system noise figure measurement to calculate the corrected Y-factor, stage connection system total noise figure and measured object gain; 6: calculating the noise figure F of the measured object. Through Y-factor correction in the measurement process, the influence of different source impedances in cold and hot states of the noise source on the noise power measurement of the output end of the measured object is reduced, and the measurement precision is improved.

The invention discloses a Ka-band broadband low-noise amplifier based on a mixed feedback mode and a design method and device thereof. The Ka-band broadband low-noise amplifier comprises an input matching network, a single-section microstrip line coupling feedback network, an inter-stage matching network, a resistance negative feedback network, a three-section microstrip line coupling feedback network and an output matching network. And an active bias network is assisted to ensure the working stability. The circuit is composed of two stages of circuits, the preceding stage circuit adopts a cascode transistor amplifier to minimize noise, and the backward stage circuit adopts a cascode structure to improve linearity and bandwidth. Simulation results show that in the frequency band of 25-40 GHz, the amplifier achieves the excellent performance that the gain is higher than 20 dB, the flatness is 0.6 dB, the noise coefficient is 1.43-1.75 dB, the output 1dB compression point is larger than 5.5 dBm, and the direct-current power consumption is only 40.6 mW. According to the low-noise amplifier, the problems of gain roll-off, high noise, limited bandwidth and the like of a traditional low-noise amplifier in broadband application are solved by innovatively combining a resistance negative feedback technology and a microstrip line coupling feedback technology.

The invention relates to the technical field of amplifiers, and discloses a high-reliability low-noise amplifier chip, the circuit comprises an active bias circuit, a cascode low-noise amplifier circuit, a feedback circuit and a large input power protection circuit, a first diode D1 is added in the active bias circuit of the low-noise amplifier, and a second diode D2 is added in the active bias circuit of the low-noise amplifier. The Vgs of the fourth transistor M4 in the cascode low-noise amplification circuit is raised due to the existence of the first diode D1, and after the Vgs are increased, the output power 1dB compression point of the circuit is increased, so that the low-noise amplifier chip can realize high output 1dB compression point and low noise coefficient. When a high-power signal is input, the existence of the high-input-power protection circuit provides a power discharge path for the fourth transistor M4, so that the dynamic voltage swing of the fourth transistor M4 is within a normal range, and the fourth transistor M4 is prevented from being burnt out due to overhigh input power; due to the existence of the twelfth resistor R12, the branch current of the high-input-power protection circuit is reduced, a post-stage diode is protected from being burnt out due to overlarge current, and therefore the reliability of the low-noise amplifier chip is improved.

This invention discloses a packet loss detection method for unmanned surface vessel (USV) formations based on adaptive fuzzy membership filtering. The method includes: establishing state equations describing the motion of both the leader and follower USVs; linearizing these nonlinear equations to simplify the complex curvilinear motion relationships into linear mathematical expressions, thus obtaining simplified state equations for the entire formation system; introducing an adjustable measurement noise figure based on the simplified formation model, dynamically adjusting the filtering intensity according to the current measurement noise level, thereby more accurately estimating the real-time state of the USVs; and simultaneously detecting packet loss during state updates, combining preset communication quality indicators and real-time calculated noise levels to determine the reliability of received data. This invention achieves good detection results for packet loss in noisy channels and can be widely applied in the field of data detection.

This application provides an erbium-doped optical fiber, an optical amplifier, and a communication device, relating to the field of optical communication technology. The erbium-doped optical fiber is a radiation-resistant erbium-doped fiber, exhibiting good gain and a low noise figure. The erbium-doped optical fiber includes a core and a cladding, with the cladding enclosing the core. It also includes a radiation-resistant layer disposed between the core and the cladding, comprising germanium, fluorine, and silicon dioxide. The absolute value of the difference between the refractive index of the radiation-resistant layer and the refractive index of the core is less than the absolute value of the difference between the refractive index of the radiation-resistant layer and the refractive index of the cladding.

The application provides a CQI acquisition method, a receiving device and an optical communication system. The method comprises the following steps: receiving a plurality of reference signals transmitted through a channel of optical communication, wherein the transmission power of each reference signal is different; acquiring a channel gain; measuring a plurality of noise powers corresponding to each reference signal according to the received plurality of reference signals; calculating a first noise coefficient related to non-independent noise according to the transmission power of the reference signal, the channel gain and the measured noise power; and acquiring the CQI corresponding to each reference signal by using the corresponding relationship between the first noise coefficient and the CQI stored in advance, and averaging to obtain an average CQI as the CQI of the channel.

The invention belongs to the technical field of communication devices, and particularly relates to a communication device for a communication vehicle, which comprises a mounting plate, a controller is fixedly connected to the upper side wall of the mounting plate, a mounting ring is fixedly connected to the upper side wall of the mounting plate, and a rotating table is rotatably connected to the outer wall of the mounting ring through a bearing. And the upper side wall of the mounting plate is fixedly connected with an adjusting motor. When the middle area of the parabolic antenna carried on the communication vehicle is locally sunken, the reflecting surface and accurate paraboloid form can be quickly recovered, gain attenuation, sidelobe level rise and noise coefficient rise caused by damage of a core area are avoided, and communication continuity and stability of scenes such as emergency communication and on-site command are guaranteed; and the service life of the antenna is prolonged, the equipment utilization rate is increased, repair can be completed without parking and dismounting, and the task reliability and the operation and maintenance efficiency of the communication vehicle in a complex environment are greatly improved.

The invention discloses an ultra-wideband low-noise-coefficient amplifier and communication equipment, the ultra-wideband low-noise-coefficient amplifier comprises a first-stage inverting amplifier, a second-stage cascode amplifier and a third-stage inverting amplifier which are connected in sequence, and the first-stage inverting amplifier adopts a Gm-boost resistance feedback structure. The second-stage cascode amplifier and the third-stage inverting amplifier are in cascade connection to achieve the working capacity of high gain and large bandwidth of the circuit, and meanwhile the third-stage inverting amplifier is connected with a signal output end. The ultra-wide-band low-noise ultra-wide-band antenna has the characteristics of ultra-wide bandwidth, low noise coefficient and high gain in a working frequency band.

An estimation method for a noise figure of a circuit of a dilution refrigerator, and a control system. The method comprises: a measurement and control system outputting a microwave signal to a dilution refrigerator at a first temperature, and calculating a noise figure by means of a first calculation model; calculating, by means of a second calculation model, noise parameters and noise factors when the microwave signal enters several cold plates; and calculating, by means of a third calculation model, a noise factor of the microwave signal passing through the entire dilution refrigerator, substituting the noise factor into the first calculation model and converting same into a noise figure, determining a compensation amount on the basis of electronic components at the cold plates, and performing summation to obtain a total estimated value of the noise figure. In the method, a noise figure of an internal circuit of a dilution refrigerator is estimated by using the derivation of noise figures of a microwave signal passing through different temperature intervals of the dilution refrigerator, such that the noise figure of the internal circuit of the entire dilution refrigerator can be obtained, thereby solving the problem of it being difficult to measure a signal-to-noise ratio of a microwave signal at a quantum chip inlet under a low-temperature environment of a dilution refrigerator.

The application belongs to the technical field of amplifiers, and discloses a low-noise amplifier, which comprises an input matching circuit, an amplification circuit, a power supply circuit and an output matching circuit; the output end of the input matching circuit is connected with the input end of the amplification circuit, the output end of the amplification circuit is connected with the first input end of the output matching circuit, and the output end of the power supply circuit is connected with the second input end of the output matching circuit; and the low-noise amplifier can obtain a smaller noise coefficient and a higher gain in a working frequency band, and the reliability of the low-noise amplifier is effectively improved.

Certain aspects of the present disclosure are directed towards methods and apparatus for wireless communication. An example method generally includes: comparing a page local oscillator (LO) frequency for page reception using a first subscriber and data traffic LO frequencies of respective bandwidth parts (BWPs) for data traffic reception using a second subscriber; determining a frequency offset to be applied to the page LO frequency or one or more of the data traffic LO frequencies based on the comparison of the page LO frequency and the data traffic LO frequencies; and performing frequency tuning of the page LO frequency or the one or more of the data traffic LO frequencies based on the frequency offset.

The invention discloses a noise coefficient measuring instrument and method comprehensively integrating a Y factor method and a cold source method, and belongs to the technical field of microwave and millimeter wave testing. The instrument hardware integrates S parameter measuring equipment, a high-sensitivity noise receiver, an impedance tuner, a noise source driving circuit and a low-loss high-isolation switch assembly. Through switching of the switch assembly, a measurement path is reconstructed, and fusion of two measurement modes of a Y factor method and a cold source method is realized on the same instrument. According to the cold source method mode, through impedance allocation and vector error calibration, the measurement error of a tool clamp in a non-ideal matching scene such as a chip is overcome; the Y factor method mode is directly connected with a tested piece through a calibrated noise source, and rapid and high-precision measurement is provided for coaxial interconnection testing. The problem of measurement limitation of a single method is solved, the requirement for high-precision noise coefficient measurement in a complex test environment can be met through a single machine, and the measurement efficiency and the application range are remarkably improved.

This invention discloses a current-multiplexed millimeter-wave variable gain amplifier based on interstage mutual coupling inductor matching. It employs a two-stage cascaded structure, including an input matching network, a low-noise module, an interstage matching network, a variable gain module, and an output matching network. The input terminal of the low-noise module is connected to the output terminal of the input matching network. The low-noise module and the variable gain module are connected through the interstage matching network. The output terminal of the variable gain module is connected to the input terminal of the output matching network. This invention overcomes the problems of high noise figure, high power consumption, and high phase error in existing variable gain amplifiers.

The invention provides an optical fiber amplifier which comprises a gain light path used for amplifying signal light; the first filter is used for filtering backward spontaneous radiation light generated when the gain light path amplifies the signal light and retaining auxiliary light meeting preset requirements; and the coupler is used for combining the auxiliary light and the new signal light to be amplified by the gain light path so as to enhance population inversion generated by amplifying the new signal light by the gain light path after beam combination. When the optical fiber amplifier amplifies the signal light, the signal light can generate stronger population inversion, so that the noise coefficient is effectively reduced, and the transmission quality of the signal light can be improved after the optical fiber amplifier is deployed to an optical communication network.

The application discloses an ultra-wideband GaAs amplitude-phase control transceiver front-end chip, which is applied to the field of phased array radars, and aims at the fact that high-low pass type phase shifters adopted in existing transceiver front-end chips are only applicable to low-frequency phase shift units, and are limited by the problem of filter order; the application proposes a novel phase shift structure based on a magnetic coupling all-pass network and an active complementary dual-mode amplification circuit, the structure can realize a great expansion of available frequency on the premise of ensuring phase shift precision, and a 180-degree phase shift network based on an active structure can effectively provide transmission gain, reduce the number of used link amplifiers, further reduce the noise coefficient of a receiving link and assist in improving the power characteristics of a transmitting link. The application of the technology helps to realize good phase shift precision, input and output return loss and lower phase shift error of the chip in an ultra-wideband range of 2-18GHz.