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Dual-channel shortwave RF preprocessing system

A dual-channel, pre-processing technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, etc., can solve the problems of not meeting the design requirements and low linearity, so as to improve linearity, improve linearity, and reduce even-order harmonics wave effect

Active Publication Date: 2017-11-07
CHENGDU ZHONGYA TONGMAO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a dual-channel short-wave radio frequency pretreatment system to solve the problem that the linearity is not high and the design requirements cannot be met

Method used

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  • Dual-channel shortwave RF preprocessing system
  • Dual-channel shortwave RF preprocessing system
  • Dual-channel shortwave RF preprocessing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the dual-channel shortwave radio frequency preprocessing system described in this embodiment includes a bandpass filter, a radio frequency attenuator and a high linearity amplifier, the signal output end of the band pass filter is connected with the signal input end of the radio frequency attenuator, and the radio frequency The signal output terminal of the attenuator is connected to the signal input terminal of the high linearity amplifier. After the radio frequency signal is filtered by the bandpass filter, it enters the radio frequency attenuator to complete the attenuation, and then the signal is amplified by the high linearity amplifier and then output. The radio frequency attenuator and the high linearity The amplifier is powered by a power supply, and the voltage of the power supply can be selected by those skilled in the art according to needs.

Embodiment 2

[0029] This embodiment is basically the same as Embodiment 1, except that the magnetic core for the bandpass filter inductance of this embodiment is a self-made nickel-zinc magnetic core, the length*width*height of the magnetic core is 3.5*2*2mm, and the aperture It is 1mm, and the magnetic permeability is 1k. It is proved by experiments that the bandpass filter of this structure has high linearity.

Embodiment 3

[0031] Such as figure 2 As shown, on the basis of Embodiment 1, this embodiment defines the radio frequency attenuator as follows: the radio frequency attenuator of this embodiment includes an input transformer T9, an output transformer T10, a first radio frequency digital attenuator U1 and a second radio frequency attenuator In the digital attenuator U2, one signal of the input transformer T9 is input to the first radio frequency digital attenuator U1, and the other signal of the input transformer T9 is input to the second radio frequency digital attenuator U2.

[0032] The RF input terminal RF1 of the first RF digital attenuator U1 in this embodiment is connected to the output terminal of the input transformer T9 after the capacitor C12 is connected in series, and the RF output terminal RF2 of the first RF digital attenuator U1 is connected to the output terminal RF2 after the capacitor C14 is connected in series. The input terminal of the transformer T10, the two VDD termi...

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PUM

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Abstract

The invention discloses a dual-channel shortwave radio frequency preprocessing system, which includes a bandpass filter, a radio frequency attenuator and a high linear amplifier, the signal output end of the band pass filter is connected with the signal input end of the radio frequency attenuator, and the signal output end of the radio frequency attenuator The terminal is connected to the signal input terminal of the high linearity amplifier. After the radio frequency signal is filtered by the bandpass filter, it enters the radio frequency attenuator to complete the attenuation, and then the signal is amplified by the high linearity amplifier and then output. The invention can greatly reduce the nonlinear distortion introduced by the conventional preprocessing system, effectively improve the linearity of the radio frequency preprocessing system, and realize the low distortion reception of the radio frequency signal.

Description

technical field [0001] The invention relates to the field of radio frequency signal processing, in particular to a dual-channel shortwave radio frequency preprocessing system. Background technique [0002] Before directly sampling the radio frequency signal, it is necessary to perform necessary filtering, amplification and level control on the radio frequency signal to achieve the best reception of the radio frequency signal. In the short-wave frequency band, due to the dense signal and the great difference in the level between the signals, in order to realize the effective reception of the short-wave signal, a high requirement is put forward for the RF preprocessing system of the short-wave signal. The design of each unit in the chain needs to be very careful so as not to cause deterioration of the performance of the pre-processing link. The conventional radio frequency preprocessing system has poor dynamic index and cannot meet the low-distortion reception of short-wave s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/32
Inventor 郝温利
Owner CHENGDU ZHONGYA TONGMAO TECH