Novel spectrum analyzer and method

Abstract

The invention relates to a novel spectrum analyzer and a method, wherein a measured signal sequentially passes through an attenuator or an amplifier and a filter and is input to a radio frequency input terminal of a first mixer; a frequency sweeping signal generated by a first local oscillator is input to the first mixer and is subjected to frequency mixing with the measured signal to generate a first intermediate frequency signal; the first intermediate frequency signal is amplified via the amplifier and the filter in sequence and is input to a radio frequency input terminal of a second mixer; a local oscillation signal of a second local oscillator is input to the second mixer and is subjected to frequency mixing with the first intermediate frequency signal to generate a second intermediate frequency signal; the second intermediate frequency signal is amplified via the amplifier and the filter in sequence and is input to a radio frequency input terminal of a third mixer; a local oscillation signal of a third local oscillator is input to the third mixer and is subjected to frequency mixing with the second intermediate frequency signal to generate a third intermediate frequency signal; the third intermediate frequency signal passes through the amplifier and the filter and is input to an ADC (analog-to-digital converter); and a digital signal output via the ADC is input to a digital signal processing module and output to a display module for displaying after data processing.

Description

technical field [0001] The invention relates to a spectrum analyzer, in particular to an intermediate frequency digital spectrum analyzer. Background technique [0002] Spectrum analyzers are divided into analog spectrum analyzers, digital spectrum analyzers, and analog / digital hybrid spectrum analyzers according to the signal analysis and processing methods. The analog spectrum analyzer is based on the scanning type. It uses filters or mixers to separate the frequency components of the analyzed signal one by one, and then cooperates with subsequent detection to obtain the signal spectrum. Almost all early spectrum analyzers belong to analog filtering. Formula or superheterodyne structure, and is still in use today. The intermediate frequency circuits all use analog devices, so the accuracy is low, the consistency is poor, and the volume is large, and its performance changes with temperature and is greatly affected by the environment. When the temperature and humidity chang...

AI Technical Summary

Problems solved by technology

[0003] In the existing spectrum analyzer solutions, some use radio frequency signal segmentation, but the hardware circuit is large in size and the scanning speed is slow

An implementation scheme that has been retrieved (patent application number: 200610013096.0, patent publication number: CN1804642A) uses two frequency conversion methods, but the frequency range of the measurement signal is small, only 1000MHz, and the technical indicators are relatively low

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