Apparatus and method for realizing ultra-wide band spread spectrum of signal/spectrum analyzer

Abstract

The invention provides an apparatus for realizing ultra-wide band spread spectrum of a signal / spectrum analyzer. A radio frequency signal is input through an ultra-wide band coaxial connector, and is divided into an original frequency band and a spread spectrum band when passing through a first switch duplex component, wherein the spread spectrum band comprises one or more frequency bands; after being subject to band-pass filtering, amplification or straight through processing, a spread spectrum band signal is input to a mixer; a built-in dot-frequency local-oscillation source is locked on a signal reference provided by an external signal / spectrum analyzer and is subjected to frequency multiplication for many times performed by a frequency multiplication component, so that one or more dot-frequency local-oscillation signals required by the spread spectrum are generated, and the dot-frequency local-oscillation signals are respectively input to a mixer corresponding to a spread spectrum frequency band and mixed with the radio frequency signal to generate signals within a working frequency band of the original signal / spectrum analyzer; and signals generated by mixing the spread spectrum frequency bands are combined into one channel, the signals are input to a second switch duplex component after being subject to filtering and amplification, then the signals are combined into one channel with original frequency band signals, and the signals enter a radio frequency port of the signal / spectrum analyzer for subsequent analysis processing.

Description

technical field [0001] The invention relates to the field of signal frequency domain analysis, in particular to a device for realizing ultra-wideband spectrum spreading of a signal / spectrum analyzer, and also relates to a method for realizing ultra-wideband spectrum spreading of a signal / spectrum analyzer. Background technique [0002] Modern signal / spectrum analyzers have excellent test dynamic range, phase noise, test amplitude accuracy and test speed. They are important tools for signal frequency domain analysis and are widely used in microwave communication, radar, navigation, electronic countermeasures, EMC testing and other fields. With the continuous development of science and technology, higher requirements are put forward for the frequency range and test sensitivity of signal / spectrum analyzers. [0003] There are two main schemes for frequency band expansion of existing signal / spectrum analyzers. One is that RS Company adopts the traditional scheme, and realizes th...

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Problems solved by technology

[0005] RS company's integrated ultra-wideband signal / spectrum analyzer solution is costly and expensive; moreover, the front-end program-controlled step attenuator and interconnection cable in this solution have a large insertion loss in the high frequency band, which will reduce the test frequency of the whole machine in this frequency band. Sensitivity index

[0006] Using a series of waveguide band spread spectrum modules, only a single waveguide band can be tested at a time, and ultra-wideband full-band quick scan test analysis cannot be performed.

Moreover, the spread spectrum scheme needs to use the internal local oscillator signal of the signal / spectrum analyzer, and the signal / spectrum analyzer is equipped with special software for control. It is required that the spread spectrum module and the signal / spectrum analyzer must be compatible. If the spread spectrum module It is not the same manufacturer as the signal / spectrum analyzer, or a product of a different period from a manufacturer, there may be problems that cannot be connected for testing

Part of the band scheme is not equipped with a preselector for filtering out mirror, multiple and other parasitic responses. Only the host software algorithm or the secondary calculation method can be used to identify mirror frequency and multiple spurious signals, which reduces the signal measurement accuracy and measurement speed.

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