A preselector fast tracking compensation circuit and method

A technology of tracking compensation and preselector, applied in the field of testing, can solve problems such as limited compensation effect and cumbersome process, and achieve the effect of ensuring linearization and improving tuning speed

Active Publication Date: 2018-02-06
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Abstract
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Problems solved by technology

The disadvantage of this method is that an additional compensation circuit needs to be added, and it is necessary to fit the YTF tuning state at different scan speeds through experiments to determine the voltage output characteristics of the compensation circuit. The process is cumbersome, and is affected by factors such as the external environment. It will also change, the compensation effect is limited, and the highest tuning speed of YTF can reach 200MHz / ms

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  • A preselector fast tracking compensation circuit and method
  • A preselector fast tracking compensation circuit and method
  • A preselector fast tracking compensation circuit and method

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Embodiment Construction

[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0063] The invention deduces the step response function in the tuning process of the preselector (YTF) through analysis, and compensates and corrects the distortion in the fast tuning process of the preselector according to the function, thereby improving the distortion-free tuning speed of the preselector. The method can increase the tuning speed of the preselector to 300MHz / ms, and greatly improves the scanning speed of the spectrum analyzer.

[0064] Such a...

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Abstract

The present invention proposes a fast tracking compensation circuit for a preselector, comprising: a YTF tuning slope compensation circuit and a YTF tuning offset compensation circuit, the slope compensation voltage output by the YTF tuning slope compensation circuit is coupled to the reference voltage terminal of the tuning DAC device, and the YTF The offset compensation voltage output by the tuning offset compensation circuit is coupled to the offset setting terminal of the tuning DAC device; the tuning DAC device receives the pre-stored DAC data for YTF tuning, and adjusts the voltage of the tuning DAC device according to the voltage of the reference voltage terminal and the offset setting terminal. Compensate the above DAC data and output the actual required tuning drive voltage. The present invention obtains the actual tuning characteristics of YTF by performing simulation analysis and calculation on the characteristics of YTF itself, and corrects the YTF tuning driving voltage in real time according to the characteristics, so as to ensure that the intermediate frequency frequency will not shift when YTF is quickly tuned, thereby improving YTF tuning speed.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to a fast tracking compensation circuit for a preselector, and also to a fast tracking compensation method for a preselector. Background technique [0002] Modern spectrum analyzers have higher and higher requirements for scanning speed. At present, the design scheme of domestic broadband spectrum analyzers adopts superheterodyne design technology, and the preselector (YTF) technology is used for frequency bands above 3 GHz. Since the preselector itself is a magnetic device , its tuning speed is limited by its own excitation coil inductance characteristics, so that when the linear input drive current flows through the YTF coil, it will be affected by the excitation inductance and cause hysteresis and delay, so that the output frequency of YTF will be lower than the ideal state. The output frequency of YTF causes signal measurement errors (mainly amplitude accuracy), and the faster t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/00
Inventor 任水生邓旭亮马风军杜念文毛黎明
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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