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Spectrum analyzer with local oscillator calibration function

A technology of spectrum analyzer and local oscillator frequency, which is applied in the field of spectrum analyzer, can solve the problems of mixer frequency conversion loss, frequency conversion distortion, etc., and achieve the effect of small circuit interference, good calibration effect, and flexible and adjustable gain

Active Publication Date: 2015-06-10
SUZHOU RIGOL PRECISION ELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the technical problems such as frequency conversion loss and frequency conversion distortion in the mixer in the prior art, and provide a spectrum analyzer with local oscillator calibration function

Method used

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  • Spectrum analyzer with local oscillator calibration function
  • Spectrum analyzer with local oscillator calibration function
  • Spectrum analyzer with local oscillator calibration function

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Embodiment Construction

[0038] The preferred embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] refer to image 3, the spectrum analyzer 300 in this preferred embodiment 1 includes a radio frequency front-end module 301, an intermediate frequency channel module 302 and a display module 303, the radio frequency front-end module 301 includes a signal input port 3011, and pre-positions the input signal introduced by the signal input port 3011 A front-end circuit 3012 that amplifies, filters, and outputs a front-end measured signal a3. The RF front-end module 301 includes a local oscillator unit 3014 that outputs a local oscillator signal b3. The local oscillator signal b3 includes a local oscillator frequency value and a local oscillator signal amplitude. , the mixer unit 3013 that outputs the intermediate frequency signal c3, the variable gain module 3016 and the drive unit 3015 that are sequentially connected between t...

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Abstract

The invention provides a spectrum analyzer with a local oscillator calibration function and relates to the field of spectrum analyzing devices. The spectrum analyzer comprises a local oscillator unit outputting a local oscillator signal, a frequency mixer unit outputting an intermediate frequency signal, a drive unit connecting the local oscillator unit and the frequency mixer unit, a variable gain module, a control unit, a digital-to-analog conversion module and a storage, wherein the local oscillator signal includes local oscillator frequency value and local oscillator amplitude, the variable gain module is disposed between the local oscillator unit and the drive unit, and the control unit adjusts the gain of the variable gain module through the digital-to-analog conversion module. Due to the fact that the variable gain module which can control the amplitude of the local oscillator signal is added, the amplitude of the local oscillator signal can be adjusted under different local oscillator frequency values, the frequency mixer is allowed to reach optimal performance easily, and the corresponding indexes of the whole spectrum analyzer are increased.

Description

technical field [0001] The invention relates to the field of spectrum analysis devices, in particular to a spectrum analyzer with a local vibration calibration function. Background technique [0002] A spectrum analyzer is a receiver used to perform spectrum analysis on the signal under test. It can measure the frequency, amplitude, distortion and other related parameters of unknown signals, and usually has a wide frequency and amplitude measurement range. Mainly used in base station maintenance, electronic product research and development, production and other fields. Spectrum analyzers can also be called frequency domain oscilloscopes, tracking oscilloscopes, analytical oscilloscopes, harmonic analyzers, frequency characteristic analyzers or Fourier analyzers. Modern spectrum analyzers can display analysis results in analog or digital modes, and can analyze electrical signals in all radio frequency bands from very low frequencies below 1 Hz to submillimeter bands. The ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/167H03G3/20
Inventor 沈艳梅王悦王铁军李维森
Owner SUZHOU RIGOL PRECISION ELECTRIC TECH