708 results about "Noise figure" patented technology

System and method for canceling crosstalk in high-speed communications systems. An embodiment comprises precomputing channel pulse responses for a set of communications channels in a communications backplane, precomputing channel signal responses for the set of communications channels in the backplane with a training sequence, estimating noise coefficients using receiver training and the training sequence, storing noise coefficients for each communications channel in the set of communications channels, and canceling noise in a received transmission of a data sequence using the stored noise coefficients. The regularity of the communications backplane enables the precomputing of various values, which reduces computational requirements. Furthermore, it is often the case that a victim receiver has access to the digital data that is being transmitted by its dominant crosstalking transmitters, thereby simplifying noise cancellation.

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 may also be used for optimizing the signal of interest.

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.

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.

A digital ultrasound beam former for ultrasound imaging, that can be configured by a control processor to process the signals from ultrasound transducer arrays with variable number of elements at variable sampling frequencies, where the lowest sampling frequency allows for the highest number of array elements. The maximal number of array elements is reduced in the inverse proportion to the sampling frequency. Parallel coupling of transmit/receive circuits for each element allow adaption of the receive Noise Figure and transmit drive capabilities to variations in the electrical impedance of the array elements.

The invention discloses an electroencephalogram signal feature extraction and classification method of combining a denoising auto encoder (DAE) and a convolutional neural network (CNN). The method includes the steps of: collecting electroencephalogram data through an electroencephalogram signal collection instrument; carrying out preprocessing of abnormal-sample removing, mean removing, signal filtering and the like on the collected data; using the auto encoder, into which a noise coefficient is added, and electroencephalogram signals for training; using hidden layers of the denoising auto encoder as feature data output; then converting obtained feature data into an image-like format; utilizing the convolutional neural network for classification; and finally, utilizing a test data set to carry out a performance test on the trained network. Compared with other traditional methods, the method of the invention can obtain a higher classification accuracy rate and higher robustness.

An AGC circuit includes both wide-band and narrow-band VGAs. Two power monitors monitor the power level of the two VGAs. Based upon the signals provided by the power monitors, the AGC circuit derives two error terms. The AGC circuit filters and combines the error terms to determine a desired adjustment to the total gain and a desired adjustment to the distribution of the gain between the wide-band VGA and the narrow-band VGA. The AGC circuit also minimizes the noise figure of the narrow-band VGA subject to linearity constraints.

Disclosed herein is a PhotoMultiplier Tube (PMT) designed for use with a surface inspection system such as the Surfscan system, which operates at 266 nm wavelength. The inventive PMT is high efficiency, low noise, and low gain, a combination of features that is specific to the application and contrary to the features of PMT's in the art. The inventive PMT is designed to be tuned to a specific narrow band wavelength of incident light, thereby optimizing the QE at that wavelength. It is further designed to combine a small number of dynodes each having substantially higher secondary electron gain than typical dynodes. By designing the PMT in this way, the excess noise factor is dramatically reduced, yielding a much improved S/N, while still maintaining the overall PMT gain in the lower range suitable for use in a surface inspection system.

Methods and systems for communicating in a wireless network include adjusting power consumption of an analog portion of a receiver in a mobile device based on the needs of the mobile device. In one example, either the gain or noise figure of the low noise amplifier (LNA) in the receiver may be adjusted based on the strength of a received signal. In other examples, the resolution of the receiver analog-to-digital converter (ADC) may be varied based on the signal strength. The dynamic adaptation of analog receiver components for high-end performance when needed and low-end performance when possible further enables a reduction of power consumption in a mobile wireless device.

A semiconductor device simulation method includes the step of storing, in a storage unit, a surface potential and threshold voltage obtained by computation, the step of computing thermal drain noise on the basis of the data of the surface potential and thermal drain noise stored in the storage unit, and the step of determining whether or not to reduce thermal drain noise, and reflecting the computation result in simulation of the model when it is determined that thermal drain noise is to be reduced. A drain current I_ds of a MOSFET is calculated and substituted into a relational expression for a drain current noise spectrum density obtained from a Nyquist theorem equation, thereby calculating a thermal drain noise coefficient γ of the MOSFET by substituting the current I_ds into a relational expression for a thermal drain noise spectrum density which is obtained from the Nyquist logical equation.

The invention provides a small-sized double-frequency active navigation antenna device which comprises a suppression plate, a first microstrip patch, a second microstrip patch, a first substrate and a second substrate. The first microstrip patch is arranged on the top face of the first substrate, the second microstrip patch is arranged on the top face of the second substrate, the second microstrip patch is arranged between the first substrate and the second substrate, and the second substrate is arranged on the top face of the suppression plate; the first microstrip patch, the second microstrip patch, the first substrate and the second substrate are arranged in a 45 degrees inclined angle in an axial direction with the suppression plat. The device improves the the axial ratio, the impedance bandwidth, the stability of a phase center of the antenna, the signal receiving ability of a low elevation GNSS (Global Navigation Satellite System) and an ability to resist multipath interference, and the placing form of the antenna microstrip patch is more applicable to the actual handheld device application. By means of a combination way of a low insertion loss filter and a out-of-band high suppression filter, the noise figure is low and the antijamming capability is improved. The inside antenna and the outside arranged antenna have the advantages of being quick in switching speed, simple in operation and high in insulation.

The invention discloses a detection system for radio frequency performance of a repeater product, which comprises a control computer, a testing instrument unit, a signal control unit and tested equipment. The control computer is respectively connected with the testing instrument unit, the signal control unit and the tested equipment through communication cables, and is also connected with a printer through a data wire. A method for realizing the detection system comprises the steps of starting the detection system, calibrating the system, connecting the tested equipment, automatically testingvarious radio frequency indexes, saving test data, disconnecting the tested equipment, performing system inquiry, exporting a test report form, closing the detection system and so on. The detection system can automatically, accurately and quickly test performance indexes of the repeater product such as maximum gain, output power, in-band fluctuation, noise factor, transmission time delay and so on, and form a report form with a unified form to be convenient for the maintenance and management of engineering personnel.

A digital ultrasound beam former for ultrasound imaging, that can be configured by a control processor to process the signals from ultrasound transducer arrays with variable number of elements at variable sampling frequencies, where the lowest sampling frequency allows for the highest number of array elements. The maximal number of array elements is reduced in the inverse proportion to the sampling frequency. The beam former can be operated both in a RF-sampling mode and a quadrature mode. Parallel coupling of transmit/receive circuits for each element allow adaption of the receive Noise Figure and transmit drive capabilities to variations in the electrical impedance of the array elements.

The invention provides a high-linearity low-noise amplifier of the front end of an ultrahigh-frequency RFID (radio frequency identification) receiver. The amplifier detects two common levels from two differential output ends of a full-differential amplifier through a common-feedback circuit, bias current of the amplifier is adjusted validly and feedback voltage is outputted to a grid of a tail current source, and accordingly, overdrive voltage of the tail current source is increased, input current is increased and linearity is improved. Meanwhile, the problem of non-linear distortion caused by instability of the output common levels is solved. In addition, a coupling capacitor is crossed interstagely to increase power grain, and noise figure is reduced to improve noise performance. The high-linearity low-noise amplifier has the advantages of low noise figure, low power consumption, and high linearity, and solves the problem of carrier leak in ultrahigh-frequency RFID receivers and zero intermediate frequency receivers, and linearity of the low-noise amplifier is improved, so that weak available signals can be amplified linearly and distortionlessly in the process of receiving block signals.

Provided are a heating element that includes: a transparent substance; a conductive heating line that is provided on at least one side of the transparent substance; bus bars that is electrically connected to the conductive heating line; and a power portion that is connected to the bus bars, wherein 30% or more of the entire area of the transparent substance has a conductive heating line pattern that is formed of closed figures where a distribution is continuous and a ratio (area distribution ratio) of a standard deviation in respects to an average value of areas of the closed figures is 2% or more, and a method for manufacturing the same.

A front-end circuit of the wireless transceiver is disclosed to reduce the number of the pin count of the chip, and achieve the impedance matching. The circuit comprises an antenna unit, a receiver, and a transmitting block, all of which are connected together, wherein there is no switch provided between the receiver and the antenna unit, such that the loss of switch can be avoided for reducing the noise figure and improve the sensitivity of the receiving path accordingly.