Microwave integrated device of radio frequency front end low waveband circuit of spectrum analyzer

A technology of spectrum analyzer and radio frequency front end, which is applied in the field of spectrum analyzer to achieve the effect of improving zero-frequency suppression ability, increasing integration degree, and improving technical indicators

Active Publication Date: 2014-02-12
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The task of the present invention is to solve the deficiencies in the microwave front-end design of the spectrum analyzer in the prior art, and provide a low-band circuit microwave integrated device for the radio frequency front-end of the spectrum analyzer

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  • Microwave integrated device of radio frequency front end low waveband circuit of spectrum analyzer

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Embodiment Construction

[0025] combine figure 1 A spectrum analyzer radio frequency front-end low-band circuit microwave integrated device, including a printed board, integrated on the printed board:

[0026] The first frequency conversion unit is provided with a first mixer 1 . The first mixer is preferably HMC787LC3B mixer. The second harmonic suppression ability of this mixer reaches 70dB, the isolation between local oscillator and radio frequency reaches 55dB, and the isolation between local oscillator and intermediate frequency reaches 42dB. The input frequency ranges from 3GHz to 10GHz, and the IF bandwidth reaches 4GHz. It can effectively reduce the leakage amplitude of the second harmonic of the radio frequency signal (especially 1.9607GHz) to the IF output terminal, and can also effectively reduce the leakage amplitude of the local oscillator to the IF output terminal, reducing the impact of the leakage signal on the back-end IF circuit.

[0027] The first local oscillator channel 2 is pro...

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Abstract

The invention discloses a microwave integrated device of a radio frequency front end low waveband circuit of a spectrum analyzer. The microwave integrated device comprises a printed board and is characterized in that a first frequency conversion unit, a first local oscillation channel, two 3.9214GHz first band-pass filters, a second frequency conversion unit and a zero frequency restraining unit are integrated to the printed board; a first frequency mixer is arranged on the first frequency conversion unit, and the second harmonic restraining capacity of the first frequency mixer reaches 70dB; a T-shaped resistance attenuation network and a first amplifier are arranged in the first local oscillation channel; the two first band-pass filters are respectively the absorption broadside coupling filter and the comb wave filter, and after the two first band-pass filters are connected in a cascade mode, out-of-band rejection of the two first band-pass filters can reach more than 70dB; the second frequency conversion unit is provided with a second frequency mixer and a second amplifier; the zero frequency restraining unit is provided with a coupler and a phase adjustment module. Double frequency conversion and zero frequency restraining in a low waveband are completed on one printed board, the design principle is greatly optimized, and the structure and layout are greatly simplified.

Description

technical field [0001] The present invention relates to a spectrum analyzer, in particular to a radio frequency front end of the spectrum analyzer. Background technique [0002] Most modern spectrum analyzers adopt frequency-sweeping superheterodyne receiving scheme. Using the method of frequency-sweeping first local oscillator, the measured signal is mixed to obtain a fixed intermediate frequency signal. After passing through filters with different bandwidths, the frequency difference can be observed. The smaller of the two signals. In the design of wideband heterodyne spectrum analyzer, in order to eliminate interference such as image and multiple responses, two schemes are often used: the first is to use a preselector; the second is to use up-conversion. Since the frequency of the preselector is limited by the lower limit, wideband spectrum analyzers are always divided into high and low bands. The low band adopts the scheme of high and medium frequency, it only needs a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/165
Inventor 任水生毛黎明
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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