Broadband preselection mixer design method

A design method and mixer technology, applied in the direction of multi-frequency modulation and conversion, can solve the problems of large frequency conversion loss, difficult implementation, narrow passband bandwidth, etc., to improve the frequency conversion frequency response, reduce the design difficulty, and reduce the frequency conversion loss. Effect

Inactive Publication Date: 2014-03-19
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Through the analysis of references and products at home and abroad, the existing domestic microwave and millimeter wave frequency band filter mixers use LAF ferrite resonators, and the passband bandwidth is narrow. When the whole machine is quickly scanned and tested, the hysteresis of the filter mixer Factors such as temperature drift, tuning nonlinearity and other factors will affect the test accuracy, and the higher the frequency, the more obvious this shortcoming is; the current operating frequency range of existing products is 26GHz-40GHz, which cannot meet the development requirements of...

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Embodiment 1

[0029] The design method of a broadband pre-selection mixer designed by the present invention uses the hybrid integration technology to integrate the ferrite magnetic modulation bandpass filter and the harmonic mixer into one component to realize the integrated broadband pre-selection of 26.5GHz-50GHz Mixer. The resonant oscillator in the ferrite magnetically tuned bandpass filter uses NZF (Nickel Zinc Ferrite) balls, which use its extremely high saturation magnetization characteristics to widen the passband bandwidth of the preselector; the harmonic mixer uses dual Balanced frequency mixing circuit, high and low local oscillator schemes are applied at the same time, reducing the difficulty of the design of the local oscillator balance-unbalanced conversion balun, the third harmonic mixing frequency covers 26.5GHz-50GHz, effectively reducing the frequency conversion loss and improving the frequency conversion frequency response of components .

[0030] The principle block dia...

Embodiment 2

[0053] On the basis of the above embodiments, further, the present invention provides a wideband preselection mixer

[0054] Design method, which includes the following steps:

[0055] Step 1: The input 26.5GHz-50GHz radio frequency signal enters the ferrite magnetic modulation bandpass filter through the coaxial cable;

[0056] Step 2: After filtering and pre-selection, a radio frequency signal is coupled from the upper and lower sides of the last-order resonator ball of the ferrite magnetic bandpass filter, and input to the radio frequency end of the double-balanced mixer diode bridge;

[0057] Step 3: After the balanced-unbalanced conversion balun, the local oscillator signal is divided into two local oscillator signals with the same amplitude and a phase difference of 180 degrees, which are respectively added to the other two ends of the diode bridge of the double-balanced mixer, and the mixed frequency The 4.9214GHz intermediate frequency signal is drawn from the local o...

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Abstract

The invention provides a broadband preselection mixer design method. Through preferable ferrite harmonic oscillator of a preselector and by utilizing high-saturation magnetization intensity characteristic of a NZF ball to broaden the passband bandwidth, the 3dB bandwidth can reach 300 MHz-500MHz. By adopting the above scheme, the influence of preselector passband offset on overall performances of a frequency spectrograph due to the inherent characteristics, such as hysteresis lag, temperature drift, and tuning nonlinearity and the like, of a magnetic device is effectively reduced; by adopting optimization coupling structure and magnetic circuit design and the like methods, the frequency range of the preselector is broadened to be 26.5 GHz-50 GHz; high and low local oscillator schemes are applied simultaneously, the design difficulty of a local oscillator Balun is reduced; a double-balanced mixer with third harmonic frequency mixing covering full waveband is established, and finally a broadband preselection mixer, of which the frequency range covers 26.5 GHz-50 GHz is designed.

Description

technical field [0001] The invention belongs to the technical field of design methods for broadband preselection mixers, and in particular relates to a design method for 50GHz broadband preselection mixers based on NZF ferrite filter technology. Background technique [0002] Among modern electronic measuring instruments, the spectrum analyzer is an important tool for signal frequency domain analysis, which is equivalent to a microwave multimeter. It is widely used in microwave communication, radar, navigation, electronic countermeasures, EMC testing and other fields. An essential measuring instrument. A modern broadband spectrum analyzer is a microprocessor-controlled sweeping receiver. Most of the front-end designs use superheterodyne schemes, using front-end pre-selection, harmonic mixing and other technologies. The front-end pre-selector tunes the pre-selected signal under the control of the system, effectively minimizes image and multiple responses. Ferrite magneticall...

Claims

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Application Information

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IPC IPC(8): H03D7/16
Inventor 张枢张永虎
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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