A device and method for realizing ultra-wideband spread spectrum of signal/spectrum analyzer

Abstract

The invention proposes a device for realizing ultra-wideband frequency expansion of a signal / spectrum analyzer. The radio frequency signal is input through an ultra-wideband coaxial connector, and is divided into an original frequency band and an expanded frequency band by a first switch duplex assembly. The expanded frequency band includes One or more frequency bands; the spread-spectrum frequency band signal is input to the mixer after band-pass filtering, amplification or pass-through processing; the built-in point frequency local oscillator source is locked on the signal reference provided by the external signal / spectrum analyzer, through The frequency multiplication component performs multiple frequency multiplication to generate one or more point-frequency local oscillator signals required for frequency spreading, which are respectively input to the mixer corresponding to the frequency spreading frequency band, and mixed with the RF signal to generate the original signal / spectrum analysis The signal in the working frequency band of the instrument; the signal generated by the spread spectrum frequency mixing is combined into one, filtered and amplified, then input to the second switch duplex component, combined with the original frequency band signal into one output, and entered into the RF of the signal / spectrum analyzer Port for subsequent analysis and 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...

AI Technical Summary

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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