6results about How to "Improved Gain Flatness" patented technology

The invention provides a low-noise amplifier and a radio frequency front-end module, and the low-noise amplifier comprises an input matching circuit, a first-stage power amplification circuit, an inter-stage matching circuit, a second-stage power amplification circuit and an output matching circuit. The inter-stage matching circuit comprises a first inductor, a second inductor and a first capacitor; the second-stage power amplification circuit is of a cascode structure; and the output matching circuit comprises a third inductor and a fourth inductor which are coupled with each other. According to the low-noise amplifier, the high-frequency gain, the in-band gain flatness, the isolation degree, the stability and the output matching bandwidth of the low-noise amplifier can be improved.

The present application relates to the field of optical communication technology, in particular to a kind of optical fiber dispersion compensation adaptive amplification method and device thereof, comprising: obtaining the dispersion compensation value of dispersion compensation module;According to the total gain of dispersion compensation module, the dispersion compensation value is redistributed to multiple fiber amplifiers;According to the gain of each fiber amplifier after redistribution, the first expected attenuation value of the variable optical attenuator arranged in each fiber amplifier is calculated respectively, and the attenuation compensation amount of each variable optical attenuator is calculated according to the dispersion compensation value;According to the first expected attenuation value and attenuation compensation amount, the second expected attenuation value is calculated;According to the probe power of the first input end of variable optical attenuator and the probe power of the first output end, the actual attenuation value is calculated;Actual attenuation value and second expected attenuation value are compared, if consistent, then stop adjusting variable optical attenuator;Otherwise, continue to adjust.

The application discloses a wide-angle frequency scanning antenna based on a dual-band coupling filter, comprising a power divider module, a dual-band filter module and an antenna radiation unit. The power divider module is used for power distribution of an input signal; the dual-band filter module is used for phase modulation of the output signal of the power divider; and the antenna radiation unit is used for signal radiation of the dual-band. The application adopts the dual-band filter to modulate the signal phase, realizes two groups of different phase distributions changing with frequency in the specified two frequency bands respectively, and covers different angle ranges in the positive and negative directions respectively, so that the wide-angle scanning from-60° to 60° is realized finally. The dual-band design reduces the design pressure of the single-band scheme. With the flexible bandwidth design function of the filter, the frequency scanning antenna can be customized according to the actual demand. The wide-angle frequency scanning antenna realized by the application has the advantages of large scanning range, small scanning gain fluctuation and customizable frequency band range.

The invention discloses an LNA (low noise amplifier) with high gain flatness and multi-band adjustment for aerospace information acquisition. Comprising a first low-noise amplification module, a first radio frequency switch, a first filtering module, a second radio frequency switch, a first adjustable attenuation module, a second low-noise amplification module, a second adjustable attenuation module, a third low-noise amplification module, a third radio frequency switch, a second filtering module and a fourth radio frequency switch which are connected in sequence. Each of the first filtering module and the second filtering module comprises a plurality of signal paths with different frequency response characteristics; a signal path of the first filtering module comprises an equalizer and a band-pass filter, and a signal path of the second filtering module comprises a band-pass filter; and the first radio frequency switch, the second radio frequency switch, the third radio frequency switch and the fourth radio frequency switch are used for selecting signal paths, so that the technical problems that in the prior art, extremely low noise and high and flat power gain are difficult to maintain in a wide frequency band, and switching in different frequency bands cannot be flexible are solved.

The invention belongs to the technical field of optical fiber communication, and particularly discloses an annular pump cavity multiplexing module and a broadband optical fiber amplification system thereof, specifically, a pump supply unit in the annular pump cavity multiplexing module provides a plurality of wave bands of pump light required by each optical fiber amplification module; the pump light coupling unit controls the transmission direction of pump light and splits the pump light, one part of the pump light enters the pump light circulating unit, and the other part of the pump light enters the pump distribution unit; the pumping distribution unit provides pumping light for each optical fiber amplification module according to wavelength and power; the pump light circulation unit compensates the absorption and loss of the pump light; and after the signal light of each optical fiber amplification module is amplified by the gain optical fiber, the pump light recovery unit recovers the residual pump light to the pump light coupling unit so as to be reused by the system. According to the broadband optical fiber amplifier, the cyclic utilization rate of the pump light is increased, fluctuation of the power of the pump light is reduced, and high-gain and low-noise integrated flat amplification of the broadband optical fiber amplifier can be achieved.

This invention discloses a high-bandwidth, notch-free hybrid magnetocurrent sensor circuit, comprising a low-frequency path, a high-frequency path, a differential amplifier, a compensation path, and a dual-to-single converter. The low-frequency path utilizes a Hall effect sensor and auxiliary bias circuitry to detect the low-frequency component of the current, and simultaneously suppresses sensitivity drift and common-mode drift by replicating a negative temperature coefficient voltage. In the high-frequency path, the integrator consists of two paths with the same gain-bandwidth product but different low-frequency gains, and gain flatness is improved through compensation technology. The servo loop employs active capacitor amplification technology, using small-area resistors and capacitors to achieve ultra-low-frequency poles. The outputs of the high- and low-frequency paths are combined via a differential amplifier and then pass through a subtractor and a high-pass filter to form a compensation path for eliminating chopper ripple. Finally, the signals are converged in the dual-to-single converter to obtain a notch-free broadband output. This invention simultaneously solves problems such as chopper notch, gain unevenness caused by pole-zero mismatch, and the use of large-area passive components.