Device generating random intermediate frequency output in receiving frequency conversion system

A frequency conversion system, intermediate frequency technology, applied in the direction of transmission system, electrical components, etc., can solve the problems of lack of flexibility, can not be well adapted, etc., to achieve the effect of great flexibility

Active Publication Date: 2014-01-22
CHINA ELECTRONIS TECH INSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The fixed intermediate frequency method commonly used at present lacks flexibility, and cannot well adapt to the requirements of different intermediate frequency frequency inputs of receiving and analyzing devices such as back-end modems, and has great limitations in the use process

Method used

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  • Device generating random intermediate frequency output in receiving frequency conversion system
  • Device generating random intermediate frequency output in receiving frequency conversion system

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Embodiment Construction

[0019] The principle of any intermediate frequency output device in the receiving system is as follows: figure 2 shown. The device includes a first local oscillator circuit ( figure 2 not shown), the first inverter ( figure 2 not shown), the first IF amplifier ( figure 2 not shown in), the first IF filter ( figure 2 not shown), a second local oscillator circuit, a second frequency converter, a second intermediate frequency amplifier, and a low-pass filter. For the post-stage frequency conversion device, 1) the second local oscillator circuit is designed as a circuit with a wide frequency range and continuously variable frequency (the frequency step can be set, the minimum can be 1Hz) instead of the original fixed frequency circuit, and the output frequency The range can be designed according to the output frequency range of the intermediate frequency; 2) In order to prevent the harmonics of the local oscillator from participating in the frequency conversion to generat...

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Abstract

The invention relates to a device generating random intermediate frequency output in a receiving frequency conversion system. The device comprises a second local oscillator circuit with continuously variable frequency. The minimum amount of a frequency step is 1Hz. The device also comprises a local oscillator segmentation filtering circuit and a wide bandwidth high out-of-band inhibition low pass filter. According to the device generating random intermediate frequency output in the receiving frequency conversion system, the range of intermediate frequency output is from 10MHz to 200MHz. Random intermediate frequency output of the microwave and millimeter wave variable frequency receiving frequency conversion system is realized, and greater flexibility is provided for subsequent signal analysis.

Description

technical field [0001] The invention relates to a device for generating intermediate frequency output in a receiving frequency conversion system, especially a device capable of generating arbitrary intermediate frequency output in a receiving frequency conversion system. Background technique [0002] In the receiving frequency conversion system, the RF / microwave signal is converted into an intermediate frequency signal for processing and analysis, and the intermediate frequency is usually fixed. The commonly used IF frequencies are 10.7MHz, 21.4MHz, 70MHz, 140MHz, 160MHz, etc. [0003] The microwave and millimeter wave receiving frequency conversion system usually uses a multi-stage frequency conversion device to convert the RF input signal into an intermediate frequency signal with a lower frequency. For example, a receiving analysis system using a 2-stage frequency conversion. figure 1 As shown, the frequency conversion tuning relationship is: [0004] N*F LO1 -F RF =F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/16
Inventor 许建华杜会文闫亚力杜以涛张超
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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