Device for correcting YIG tuned filter scanning tuning nonlinearity in real time

A tuning filter, nonlinear technology, applied in electrical components, impedance networks, etc., can solve the complex and difficult problems of swept tuning nonlinear compensation

Active Publication Date: 2013-10-09
CHINA ELECTRONIS TECH INSTR CO LTD
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  • Abstract
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Problems solved by technology

[0006] Therefore, considering the influence of factors such as YTF temperature drift and

Method used

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  • Device for correcting YIG tuned filter scanning tuning nonlinearity in real time
  • Device for correcting YIG tuned filter scanning tuning nonlinearity in real time
  • Device for correcting YIG tuned filter scanning tuning nonlinearity in real time

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Embodiment Construction

[0016] The idea of ​​YTF scanning tuning nonlinear correction in the present invention is to adjust the slope of the preset DAC in real time to achieve the effect of linear fitting according to the YTF scanning and tuning nonlinear curve; and the adjustment of the preset DAC slope is to add another path of scanning nonlinear correction circuit to achieve. Different from the commonly used scan tuning compensation method that adds the same offset value in a large frequency range, the present invention can make each frequency point have a separate scan tuning compensation value, the compensation is more accurate and effective, and it is more conducive to the rapid scanning of YTF tuning.

[0017] Such as image 3 , The real-time correction device includes a YTF real-time calibration source part (comprising a comb generator 1 and a switch 2) and a YTF tuning drive and compensation part (comprising a counter 3, a data accumulator 4, an address accumulator 5, a data RAM6, a DAC 1 ...

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Abstract

A device for correcting YIG tuned filter scanning tuning nonlinearity in real time comprises an YTF, an YTF real-time calibration source part and an YTF tuning driving and compensating part, wherein the YTF real-time calibration source part and the YTG tuning driving and compensating part are connected to the YTF. Each frequency point has a single scanning tuning compensation value, therefore, compensation is finer, and the YTF is beneficial to being rapidly scanned and tuned. The device for correcting YIG tuned filter scanning tuning nonlinearity in real time can conduct real-time correction and calibration and avoid the influences of environment temperature change, YTF aging and other factors.

Description

technical field [0001] The invention relates to a device for real-time correction of scanning and tuning nonlinearity of a YIG tuning filter. Background technique [0002] YIG tuned filter (Yttrium Iron Garnet Tune Filter, referred to as YTF) is a bandpass filter whose center frequency can be tuned electrically. It is a YIG device that uses YIG balls as tuning elements. After the signal is filtered by YTF and then mixed, the amplitude of the image signal generated during the mixing process can be greatly reduced, and the harmonic distortion index can also be improved. Therefore, YTF is widely used in microwave and millimeter wave signal receiving and analysis equipment. [0003] Driven by an external DC current, a tuning magnetic field is generated inside the YTF, and the magnetic field acts on the YIG ball to generate a corresponding tuning frequency. The relationship between YTF tuning frequency and driving current is characterized by tuning sensitivity, and the unit is ...

Claims

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Application Information

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IPC IPC(8): H03H9/46
Inventor 杜会文许建华王峰郭小文周钦山
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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