Image cancellation in frequency converters for spectrum analysers

一种频率转换、频率的技术，应用在消除影像谱线的处理领域，能够解决不令人满意等问题

Inactive Publication Date: 2007-10-17
ADVANTEST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0055] The invention is also based on the new problem that the prior art operation of doing two scans may not be satisfactory in certain cases

Method used

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  • Image cancellation in frequency converters for spectrum analysers
  • Image cancellation in frequency converters for spectrum analysers
  • Image cancellation in frequency converters for spectrum analysers

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Embodiment Construction

[0071] Further characteristics and advantages of the invention will become clearer in the following description of embodiments of the invention given as non-limiting examples with reference to the accompanying drawings.

[0072] The invention also proposes to eliminate image spectral lines from the screen display, as will be described.

[0073] The present invention also proposes to proceed with the third scan to distinguish the actual spectral lines from the image spectral lines. A third scan was performed based on the lines identified in the first and second scans to remove any possible confusion about actual and imaged lines.

[0074] More generally, the invention proposes to perform at least a first scan providing actual and image spectral lines, and then perform further scans to distinguish between actual and image spectral lines that the at least first scan cannot distinguish. Further scans are performed based on the spectral lines determined in said at least first scan...

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Abstract

The process eliminates image rays generated in a frequency converting device generating actual rays and image rays from frequency rays of an input signal. The frequency converting device comprising a mixer (2) mixing the input signal and a signal provided by a local oscillator (4) and a filter assembly (6) filtering the mixed signals output by the mixer (2). In a first sweep and a second sweep, the frequency of the oscillator is varied and the signal level at the output of the frequency converting device is recorded for a set of converted frequencies. The second sweep is carried out so that the frequency of the actual ray generated in the second sweep by an input ray is the same as the frequency of the actual ray generated in said first sweep by said input ray, and the frequency of the image ray generated in the second sweep by an input ray is not the same as the frequency of the image ray generated in said first sweep by said input ray. Then, the process determines if a ray-including signal level was recorded both during the first sweep and the second sweep for at least one converted frequency and displays an indication of the presence of a ray for said at least one converted frequency on a screen (14) only if said determination is positive.

Description

technical field [0001] The present invention relates to frequency converters. More specifically, it relates to the process of eliminating image rays in frequency converters. Background technique [0002] A spectrum analyzer is a measuring instrument that quantifies the energy or electromagnetic energy contained in each frequency in the electromagnetic spectrum of the signal being analyzed. Such analyzers typically operate in the frequency range from a few hundred hertz or less to several gigahertz. This instrument is used in the design of radio frequency and microwave systems, especially for measuring electromagnetic perturbations that disrupt wireless transmissions. It is also used for calibrating and tuning communication systems installed on higher points such as private towers, tall buildings, etc. For these reasons, and because wireless transmission is a rapidly growing industry, weight and bulk are becoming more and more important to the user's safety and working con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/173
CPCG01R23/173
Inventor 雅基·格里福
Owner ADVANTEST CORP
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