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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
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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 instrument, realize down-conversion by narrow-band local oscillator and switch filter, to solve the down-conversion method of traditional technology difficult, cost is high, scanning long time problem

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  • 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

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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...

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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

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Application Information

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IPC IPC(8): H04B1/16G01R23/16
Inventor 梁强
Owner ANHUI EGRETS ELECTRONICS TECH
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