任意波形發(fā)生模塊數(shù)字通道的設(shè)計(jì)與實(shí)現(xiàn)
[Abstract]:Arbitrary waveform generator is a special signal source, which has all the characteristics of signal source. In today's communication test system, the single channel arbitrary waveform generator can not meet the requirements of test accuracy and test parameter range. With the development of science and technology and the requirement of the precision of the test system, the excitation signal of two channels or even multiple channels is needed, and an arbitrary waveform generator with multi-standard and high precision is designed. Based on the research background of portable vector signal source, this paper focuses on the baseband waveform generation technology in arbitrary wave mode and the variable sampling rate processing technology of multi-rate arbitrary waveform signal. This paper is based on the idea of software radio, taking "DSP FPGA DDR3 DA board" as hardware platform, through scheme design, test, simulation and verification, the storage rate of baseband signal can reach 800MSa/s and the signal reconstruction of maximum 200 times interpolation multiple is realized. This paper first introduces the overall scheme of this project, which mainly includes two parts: variable rate baseband signal processing and digital-analog conversion of digital arbitrary waveform signal. Variable rate baseband signal processing mainly includes the following three modules: first, the FPGA receives the DSP transmission command and the design of the data channel, completes the signal communication between DSP and FPGA. Secondly, the design of DDR3 SDRAM data storage module, through the configuration, simulation and verification of the DDR3 SDRAM storage controller, ensures the high-speed writing and reading operation of the digital baseband signal, and realizes the playback function of the digital baseband signal. Thirdly, the design of variable sampling rate processing module, through the design of FIR CIC combined filter, can efficiently filter the mirror image component of arbitrary waveform and suppress its harmonic component, so as to obtain smooth and complete arbitrary waveform signal. The digital-analog conversion module of digital arbitrary waveform is another important aspect of this paper. The conversion from arbitrary waveform signal processed by FPGA to analogue arbitrary waveform signal needs high-speed digital-to-analog conversion. The generated analog arbitrary waveform signal is up-converted to the RF module of the arbitrary waveform generator and the waveform output is realized by the corresponding signal conditioning circuit. This paper provides a set of digital path design techniques for arbitrary waveform generation module, some of which are implemented in Airtx-7 series FPGA, the other part is implemented on the D / A board. The function modules are verified by using spectrum analyzer and ChipScope software, which can realize the generation of arbitrary waveforms of two channels and meet the requirements of predetermined digital paths.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TN702
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