9 results about "Noise matching" patented technology

This invention provides a method and system for testing high-frequency transformer winding coils, relating to the field of high-frequency transformer technology. The method includes the following steps: generating a standard calibration signal matching the target test frequency range, connecting it to an unloaded test link, a short-circuit test link, and a standard impedance load link respectively; collecting noise signal characteristics of each link; and establishing a noise database and calibration coefficient table. Through sensing units deployed around the winding coil, the method non-contactly collects electromagnetic field change data during coil operation in real time. This invention addresses interference problems caused by cable parasitic inductance, environmental electromagnetic noise, and instrument noise in high-frequency scenarios through pre-calibration and adaptive anti-interference compensation mechanisms. By establishing a noise database, it achieves accurate noise matching. Combined with adaptive filtering algorithms and dynamic adjustment of the excitation signal, it significantly improves the testing accuracy of sensitive parameters such as leakage inductance and distributed capacitance, ensuring test reliability.

The application relates to a millimeter wave reconfigurable common-source common-gate amplifier and a reconfigurable method thereof, which comprises an input reconfigurable matching network, a common-source common-gate transistor and an output reconfigurable matching network. The millimeter wave reconfigurable common-source common-gate amplifier of the application realizes impedance and noise matching of different frequency bands by reconfiguring the capacitance value of the input matching network and the inductance value of the output matching network, and simultaneously combines a transformer coupling gain promotion structure to make different frequency bands have larger amplification gains. The millimeter wave reconfigurable common-source common-gate amplifier circuit structure and the reconfigurable method of the application are simple and suitable for use in a multi-frequency band millimeter wave transceiver system. A conventional millimeter wave amplifier works at a fixed frequency, which limits the application in a multi-frequency communication system.

The invention discloses a doubly-fed ultra-wideband low-noise amplifier architecture based on three-coil magnetic coupling, which is characterized in that a radio frequency signal is input to a first cascode amplifier unit through a first matching network, and the first cascode amplifier unit is connected with a second cascode amplifier unit through a second matching network; the second cascode amplifier unit outputs the amplified radio frequency signal through a third matching network; the first matching network is a double-fed ultra-wideband input noise matching network based on three-coil magnetic coupling, and three-coil magnetic coupling is formed through a source degeneration inductor and a first L-shaped matching network inductor; the second matching network is a double-fed ultra-wideband inter-stage matching network based on three-coil magnetic coupling, and three-coil magnetic coupling is formed through a second parasitic compensation inductor and a second L-shaped matching network inductor; the third matching network is a doubly-fed ultra-wideband output impedance matching network based on three-coil magnetic coupling, and three-coil magnetic coupling is formed through a third parasitic compensation inductor and a third L-shaped matching network inductor.

The invention discloses a low noise amplifier for realizing broadband noise matching, which comprises a broadband input power matching network, a minimum noise coefficient expansion network, an amplification stage and an output stage, the input end of the broadband input power matching network is electrically connected with a signal source, and the broadband input power matching network is used for carrying out impedance matching on an input signal; the minimum noise coefficient expansion network is used for performing noise coefficient expansion on the input signal; the input end of the amplification stage is connected with a signal subjected to impedance matching and noise coefficient expansion, and the amplification stage is used for counteracting signal noise and amplifying the signal; and the input end of the output stage is electrically connected with the output end of the amplification stage, and the output stage is used for carrying out buffering and impedance conversion on the amplified signal from the amplification stage and outputting the buffered signal to an external load. According to the low-noise amplifier, the contradiction between broadband input power matching and broadband noise matching can be broken through, broadband noise matching is achieved on the basis of broadband input power matching, the noise coefficient is made to be matched with the theoretical minimum noise, and the performance of the low-noise amplifier is improved.

The present application relates to a vehicle and a control method thereof. Specifically, a vehicle selectively providing an important sound to an occupant includes a microphone configured to receive a noise, a speaker, a storage configured to store a plurality of sound waveforms and a warning sound source corresponding to each of the plurality of sound waveforms, and a controller configured to generate a noise cancellation signal based on the noise, control the speaker to output a noise cancellation sound corresponding to the noise cancellation signal, compare a waveform of the noise with the plurality of sound waveforms when a sound pressure level of the noise is greater than a threshold, and control the speaker to play the warning sound source corresponding to the sound waveform matching the noise when the waveform of the noise matches any one of the plurality of sound waveforms.

The application provides a small sample positioning algorithm based on electromagnetic flying ring space-time inseparable characteristics, and is used for solving the technical problems that the existing technology needs more training amount to have higher accuracy and that too many classification numbers result in low sample fitting effect in the background art.The application discloses a small sample positioning algorithm based on electromagnetic flying ring space-time inseparable characteristics, and comprises the following steps: step one: selecting a line segment on a half space plane along a propagation axis as a boundary to measure, and obtaining space spectrum data on the line segment; step two: for the data detected by the electromagnetic flying ring, after normalization, the data is decomposed according to the detection sequence, r-axis and z-axis, so that the number of categories is reduced and the number of samples is increased; step three: the data is subjected to noise addition and expansion, the sample amount is increased, and the generalization ability is enhanced, training noise and test noise with different variances are set to carry out combination experiments, and relatively accurate noise matching results are obtained.

This invention discloses a high-gain, miniaturized millimeter-wave low-noise amplifier. It includes an input matching network, a noise level circuit, a gain stage circuit, and an output matching network. The low-noise amplifier uses a series gate inductor for noise matching and wide-bandwidth input impedance matching. The gain stage employs a slow-wave transmission line feedback mechanism to achieve high gain and wide bandwidth, and miniaturization is achieved through a spiral inductor and a slow-wave transmission line. The output matching network uses an L-shaped matching network. Unlike traditional inductors or transmission lines, this invention uses a slow-wave transmission line for feedback, achieving high gain while also possessing foldable characteristics and allowing the same inductance value to be achieved with a shorter length, thereby reducing chip area and manufacturing costs.

The invention discloses a broadband low-noise amplifier, relates to the technical field of radio frequency integrated circuits, and solves the problem that a single-stage low-noise amplifier is difficult to realize noise matching and impedance matching in a broadband at the same time. According to the broadband low-noise amplifier, broadband noise matching and impedance matching are achieved based on a three-coil transformer structure, meanwhile, a reverse coupling transformer acts on a common-gate transistor to expand the gain bandwidth, and therefore the effects of broadband input matching, broadband low noise and broadband gain are achieved at the same time under the power consumption of a single-stage circuit.

The application relates to a millimeter wave reconfigurable common-gate amplifier and a reconfigurable method thereof, which comprises an input reconfigurable matching network, a common-gate stage transistor and an output reconfigurable matching network. The millimeter wave reconfigurable common-gate amplifier of the application realizes impedance and noise matching of different frequency bands by reconfiguring the capacitance value of the input matching network and the inductance value of the output matching network, and simultaneously combines a transformer coupling gain promotion structure to make different frequency bands have larger amplification gains. The millimeter wave reconfigurable common-gate amplifier circuit structure and the reconfigurable method of the application are simple and suitable for use in a multi-frequency millimeter wave transceiver system. A conventional millimeter wave amplifier works at a fixed frequency, which limits the application in a multi-frequency communication system.