Digital high speed automatic gain preconditioning device

Abstract

A digital high speed automatic gain preconditioning device comprises a coupler, a wave detector, an analog-to-digital converter, a digital-to-analog converter, a variable gain amplifier, a high-accuracy analog-to-digital converter, an FPGA regular processor and a digital signal processor. The device uses a feedforward structure; the coupler outputs two paths of signals, wherein one path enters the variable gain amplifier, and the other path enters the wave detector; the output of the wave detector obtains an intermediate frequency signal power value after the sampling of the analog-to-digitalconverter; the control quantity of the variable gain amplifier is obtained after the intermediate frequency signal power value is input to the FPGA regular processor and processed according to certain rules; and the control quantity controls the yield value of the variable gain amplifier after the conversion of the digital-to-analog converter. In the device, under the condition of guaranteeing dynamic range, stability and accuracy, quantitative reduction automatically gain and adjust the required time, thereby improving the scanning speed of an electromagnetic signal analyzer; and the controllogic is finished by the FPGA regular processor without occupying the resources of the digital signal processor.

Description

technical field [0001] The invention relates to an intermediate frequency gain adjustment of an electromagnetic signal analyzer, in particular to a digital fast automatic gain pre-adjustment device. Background technique [0002] The electromagnetic signal analyzer needs to sample the intermediate frequency signal, but when the electromagnetic signal analyzer needs to monitor the electromagnetic spectrum in a complex electromagnetic environment, the power of the intermediate frequency signal obtained after the space signal is amplified with a fixed gain sometimes fluctuates up to tens of decibels. Exceeding the input dynamic range of the analog-to-digital converter, it is difficult for the existing analog-to-digital converter to meet the demand of the input dynamic range of the electromagnetic signal analyzer. In order to solve this contradiction, the automatic gain control technology is used in the electromagnetic signal analyzer, and the intermediate frequency gain needs to...

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Problems solved by technology

[0006] The third is the method based on software calculation, which does not require a detector, directly samples, and then obtains the power level of the signal through software calculation and analysis, but this method consumes a long time

Now the intermediate frequency gain adjustment method of the electromagnetic signal analyzer is a bottleneck for improving the speed of data processing, so the existing intermediate frequency gain adjustment method is difficult to meet the requirements of the current electromagnetic signal analyzer

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