Spectrum analysis method of FPGA (Field Programmable Gate Array) digital logic signal

Abstract

The invention relates to a spectrum analysis method of an FPGA (Field Programmable Gate Array) digital logic signal. The method comprises the following steps of implementing computer logic simulation on a logic function which occurs during the process of realizing an original digital logic signal Ls; converting the digital logic signal LS of computer logic simulation output to a digital signal Fs available for spectral analysis; implementing discrete Fourier transformation on the Fs to obtain a spectrum Ms(e<jw>) of the digital signal; actually outputting the logic function which occurs during the whole realization process of the digital logic signal Ls, and implementing actual spectral measurement on the FPGA digital logic function through a spectrum analyzer to obtain a spectrum Mr(e<jw>) of an actual output digital signal Fr; comparatively analyzing the Fs spectrum Ms(e<jw>) and the Fr spectrum Mr(e<jw>). According to the method, the analysis method of the digital logic signal is expanded from time domain to frequency domain; compared with a traditional analysis method of the digital logic signal, the method has the advantage of judging whether the digital logic signal quality, the digital logic function and the time sequence are correct or not by using a method of combining the frequency domain simulation of the digital logic signal and the spectrum analysis of the actual signal.

Description

technical field [0001] The invention belongs to the technical field of high-speed signal spectrum, and more specifically, relates to a spectrum analysis technology of high-speed digital logic signal. Background technique [0002] In high-speed digital systems, there are many ways and means of simulation software and logic analyzers to verify whether the digital logic function and timing are correct, but whether it is the simulation software used for function and timing simulation or the logic analyzer for actual measurement The analysis is done in the time domain. However, when the high-speed digital signal is output, it is often aperiodic due to the reflection, interference or ground potential jump caused by the mismatch or unconnected terminal transmission line, and the burr and oscillation caused by the bus competition; The edge signals of edge signals also often contain important harmonic information above their fundamental frequency. Therefore, for traditional time-doma...

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Problems solved by technology

[0002] In high-speed digital systems, there are many ways and means of simulation software and logic analyzers to verify whether the digital logic function and timing are correct, but whether it is the simulation software used for function and timing simulation or the logic analyzer for actual measurement The analysis is done in the time domain. However, when the high-speed digital signal is output, it is often aperiodic due to the reflection, interference or ground potential jump caused by the mismatch or unconnected terminal transmission line, and the burr and oscillation caused by the bus competition; The edge signals of edge signals also often contain important harmonic information above their fundamental frequency. Therefore, for traditional time-domain test instruments, the requirements for bandwidth, real-time sampling and data processing capabilities are relatively high, and the technical implementation is difficult and costly. In addition, the analysis of digital logic signals from the time domain cannot fully reflect the characteristics of the signals

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