Method for realizing down conversion of radio frequency spectrometer by narrow-band local oscillation and switch filtering

A technology of radio frequency spectrum and bandpass filter, which is applied in the field of communication, can solve the problems of high cost, difficulty, and long scanning time, and achieve the effect of low cost, narrow span, and simple circuit form

Active Publication Date: 2010-10-20
ANHUI EGRETS ELECTRONICS TECH
View PDF2 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of method that utilizes narrow-band local oscillator and switch filter to realize down-conversion of radio frequency spectrum instr

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for realizing down conversion of radio frequency spectrometer by narrow-band local oscillation and switch filtering
  • Method for realizing down conversion of radio frequency spectrometer by narrow-band local oscillation and switch filtering
  • Method for realizing down conversion of radio frequency spectrometer by narrow-band local oscillation and switch filtering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Such as Figure 4 As shown, the frequency range of the RF input signal is 9 kHz to 3 GHz. According to the input frequency, it is filtered by five filters and then enters the first mixer. The filter is strobed by two five-select one switches. That is, the RF input signal is divided into five bands BO, B1, B2, B3 and B4 in the whole frequency band. Their frequency ranges are as follows: Figure 4 As shown, the frequency tuning equation of the BO band is:

[0028] f LO1 -F RF =IF1(IF1=1221.4MHz, usually called the first intermediate frequency, that is, the high-frequency)

[0029] The frequency tuning equation for the B1 band is:

[0030] f LO1 -F RF =IF2 (IF2=601.4MHz, usually called the second intermediate frequency)

[0031] The frequency tuning equations for the B2, B3 and B4 bands are:

[0032] f RF -F LO1 =601.4MHz

[0033] where F RF is the RF input signal, F LO1 for the first local oscillator.

[0034] RF signals in BO band and F LO1 The IF1 interme...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for realizing down conversion of a radio frequency (RF) spectrometer by narrow-band local oscillation and switch filtering. RF down-conversion fully utilizes three frequency coordinating modes and divides RF signals into five wave bands for down-conversion; utilizing switch filtering to realize frequency selection of the signal of different wave bands, so that thefirst local oscillation has narrow frequency span and low frequency; utilizing a plurality of band-pass filters in high wave band to realize frequency selection and frequency tuning, so that the design of the RF band filter is easy to realize. The invention has the advantages of simple and easy design, low cost and the like, and can be widely applied in down-conversion modules of economical and hand-hold RF spectrometers, RF receivers and RF network analyzers.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for down-converting radio frequency signals of a radio frequency spectrum analyzer, in particular to a method for realizing down conversion of a radio frequency spectrum analyzer by using a narrow-band local oscillator and a switch filter. Background technique [0002] Most spectrum analyzers use superheterodyne technology to down-convert radio frequency signals to obtain intermediate frequency signals that can be processed (usually from tens of megahertz to hundreds of megahertz). Since a fixed intermediate frequency is obtained after down-converting radio frequencies of different frequencies, a wider radio frequency local oscillator is required to cover the measurement frequency range (generally, the frequency span of the local oscillator signal is required to be equivalent to the frequency range of the radio frequency input signal). In the superheterodyne spectrum analyzer, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04B1/16G01R23/16
Inventor 梁强
Owner ANHUI EGRETS ELECTRONICS TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap