Real-time spectrum analyzer tracking generator design method

Abstract

The invention discloses a real-time spectrum analyzer tracking generator design method. 100 MHZ reference serves as phase demodulation reference of a first local oscillator and a tracking generator local oscillator loop; a first local oscillator signal is divided into two paths through a coupler, wherein one path of local oscillator signal passes through an amplifier 1 and then, reaches a reception down-conversion channel, and the other path of local oscillator signal passes through an amplifier 2 and then, reaches a frequency mixer; the reception down-conversion channel outputs an Intermediate-frequency signal to a high-speed ADC; and the high-speed ADC carries out digitization on an analog signal, and then, carrying out signal processing analysis. A tracking generator local oscillator output signal realizes mixed output or direct output with the first local oscillator signal through selection of switches 1 and 2, and then, passes through an amplifier 3, a low-pass filter 2 and a radio-frequency attenuator in sequence to serve as tracking generator output. On the basis of an original hardware architecture of a real-time spectrum analyzer, the method increases a tracking generatorand output channels thereof, conveniently realizes spectrum analyzer all-band tracking generator design, enables the spectrum analyzer to have a tracking generator measurement function, and greatly expands the application range of the real-time spectrum analyzer.

Description

technical field [0001] The invention relates to the technical field of realizing a tracking source of a spectrum analyzer, in particular to a design method for a tracking source of a real-time spectrum analyzer. Background technique [0002] The tracking source is one of the important options of the spectrum analyzer. The spectrum analyzer with the tracking source option can realize the measurement of amplitude-frequency characteristics and voltage standing wave ratio, which greatly expands the application range of the spectrum analyzer. Because the local oscillator of the traditional sweeping frequency spectrum analyzer is sweeping, it is easy to realize the tracking source as follows: figure 1 shown. The first local oscillator is coupled to the tracking source mixer, and mixed with the tracking source local oscillator to generate the tracking source output; in the design, the frequency of the tracking source local oscillator remains unchanged, so that the tracking source ...

AI Technical Summary

Problems solved by technology

[0003] At present, the first local oscillator of the real-time spectrum analyzer works in the point frequency mode, and the high-speed ADC performs fast acquisition and performs FFT transformation to realize spectrum analysis. The signal processing performs real-time spectrum analysis according to the bandwidth set by the user, so generally there is no tracking source option, which cannot be realized. Amplitude-frequency characteristic and VSWR measurement

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