Spectrum analyzer with calibration function

Abstract

The invention discloses a spectrum analyzer with a calibration function and relates to the field of spectrum analyzing devices. The spectrum analyzer with the calibration function comprises a signal processing unit for measuring a calibration signal and a to-be-measured signal in a time-dividing mode, a calibration signal generation unit generating a calibration signal, and a switch unit arranged between the calibration signal generation unit and the signal processing unit for gating a calibration signal. As the switch unit is arranged between the calibration signal generation unit and the signal processing unit for gating the calibration signal, in need of calibration, the signal processing unit selects to be connected with the calibration signal, the calibration signal is gated to be connected with the switch unit, and the calibration signal can enter the signal processing unit smoothly via the switch unit; after calibration is finished, on the basis when the signal processing unit breaks the calibration signal, the switch unit is controlled to be broken, the switch isolation degree between the calibration signal generation unit and the signal processing unit is enhanced, and stray signals caused by the calibration signal when the spectrum analyzer measures the to-be-measured signal are reduced.

Description

technical field [0001] The invention relates to the field of spectrum analysis devices, in particular to a spectrum analyzer with a calibration function. Background technique [0002] Spectrum analyzer is a receiver used to analyze the spectrum of the signal under test. It can measure the frequency, amplitude, distortion and other related parameters of unknown signals. It usually has a wide range of frequency and amplitude measurement. Mainly used in base station maintenance, electronic product research and development, production and other fields. Spectrum analyzers are generally divided into two types: frequency sweep and real-time analysis. [0003] refer to figure 1 , the spectrum analyzer 100 of the prior art mostly adopts a superheterodyne structure, and the input signal introduced by the RF front-end module 101 and the intermediate frequency channel module 102 are subjected to multiple frequency conversions to make it become an intermediate frequency signal, and the...

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Problems solved by technology

[0006] However, it has been found in the research that the calibration method adopted in the prior art is flawed. In the spectrum analyzer 100 or the spectrum analyzer 200, even if the single-pole double-throw switch 4 inputs the signal to be tested into the front-end link 104 when it is selected. Or the front-end link 204, a part of the calibration signal output by the calibration signal output unit 3 will also be coupled to the front-end link 104 or the front-end link 204 through the SPDT switch 4, thereby forming unwanted stray on the display screen, if There are other interference signals coupled or crosstalked into the calibration signal, then other interference signals coupled or crosstalked into the calibration signal will also be coupled to the front-end link 104 or the front-end link 204 through the SPDT switch 4, forming more spurious

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