Design Of 10GHz Broadband Data Acquisition Module Based On Subband Decomposition

Due to the rapid development of modern electronic systems,the frequency of the signal is getting higher and higher,the bandwidth is wider and wider,the transient characteristics are becoming more obvious,and the degree of complexity is also increasing.According to the sampling theorem,to deal with several GHz signal testing,an oscilloscope needs to have a high bandwidth above 10 GHz and a high sampling rate of tens of GSps.This paper builds a 40 GSps,10GHz high-speed and high-bandwidth data acquisition system based on subband decomposition technology,and focuses on the research and design of high-speed data transmission,broadband signal triggering and broadband signal amplitude-frequency compensation in the acquisition module and its implementation in FPGA.The main research contents of this article are as follows:1.Study the high-speed data transmission between sub-bands in the sub-band decomposition system.Combining the demand for data transmission volume and rate between subbands,a dual-edge transmission scheme based on Ser Des is proposed,and the problem of transmission errors caused by metastability is analyzed and solved.Based on the characteristics of the subband decomposition system,the Chinese remainder theorem is proposed.The "three-point method" of the "three-point method" of synchronous loss of points finally realizes the high-speed and stable transmission of data between two FPGAs between sub-bands.2.Research the trigger technology of 10 GHz broadband acquisition system.Based on the existing platform,analyze and compare methods to achieve high-bandwidth triggering.For the sub-band decomposition system,a digital triggering scheme of multisubband serial-parallel combination is proposed,and a scheme for quickly finding the trigger location point is proposed,which solves the problem of accurate triggering of the10 GHz high-bandwidth acquisition system.3.Research the amplitude-frequency compensation technology of 10 GHz broadband acquisition system.First,combining the characteristics of large amplitude-frequency fluctuations between multiple subbands in this project,and comparing the traditional frequency domain compensation scheme,an optimized filter coefficient design scheme is proposed.Then,the various FPGA implementation structures of the FIR filter are analyzed,and the results are obtained.A fully parallel systolic array filter structure suitable for this system is developed.The final experiment and test results show that this paper has realized a 40 GSps,10GHz broadband data acquisition system based on subband decomposition,completed high-speed data transmission in the subband,and allocated the use of FPGA resources more reasonably.The trigger design of the 10 GHz broadband acquisition system is realized to ensure the stable display of the full-band waveform.In addition,the amplitudefrequency compensation design of the 10 GHz brodband acquisition system was completed,and the final amplitude fluctuation was within 3dB.