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Design And Implementation Of Multi-channel Parallel Scheme Applied To Broadband High Precision Photonic Analog-to-digital Converter

Posted on:2019-03-10Degree:MasterType:Thesis
Country:ChinaCandidate:Y YuanFull Text:PDF
GTID:2428330590467412Subject:Electronic Science and Technology
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With the rapid development of digital signal processing,the demand for analog-to-digital converters with higher bandwidth,sampling rate and accuracy is growing rapidly in the engineering fields like radar,electronic reconnaissance,high-speed telecommunication.The photonic analog-to-digital converter overcomes “electron bottleneck” of the electronic analog-to-digital converter and has advantages of large sampling bandwidth,high acquisition accuracy and reconfigurable ability to meet the application of different bands,thus it becomes development direction of the future analog-to-digital converters.In this thesis,a novel multichannel parallel de-multiplexing photonic analog-to-digital converter system is proposed.This system utilizes actively mode-locked laser to acquire optical sampling clock with high-speed and low time jitter.Meanwhile,the system reduce the demand for bandwidth and sampling rate of back-end electronic quantizer by adopting a dual-ouput Mach-Zehnder modulator based multichannel de-multiplexing scheme.Eventually,a broadband high accuracy photonic analog-to-digital converter is implemented.In this dissertation,research on the performance of radar transceiver using this system is discussed.Main contents of the thesis are summarized as follows:(1)The four main kinds of photonic analog-to-digital converters and their research status quo both domestic and abroad are summarized.Their advantages and disadvantages are compared.According to the latest research trends,it is leaned that the higher sampling rate and higher precision are the two important research directions of the future photonic analog-to-digital converters.(2)The principle of photonic sampled analog-to-digital converters architecture is theoretically analyzed.Two common multichannel multiplexing technologies for high speed and high precision and the multichannel mismatch problems are pointed out.The principle of band pass sampling in radar application is discussed.(3)The principle of multichannel parallel de-multiplexing scheme,the system architecture of photonic analog-to-digital converter based on 8-channel parallel de-multiplexing scheme at the sampling rate of 25.6 GS/s and the implementation of the system prototype are introduced in details.The level of multichannel mismatch of the analog-to-digital converter is tested and compensated.The experimental results show that the system achieves 7.8-bit and 6.9-bit resolution at X-band and Ka-band carrier,respectively.(4)By applying the implemented broadband high precision photonic analog-to-digital converter system to the radar transceiver,radar transceiver principle experiment was carried out to explore effect of channel mismatch problems of the photonic analog-to-digital converters system on radar performance.Test results show that the radar transceiver's range resolution reaches 6.4 cm when the transceiver receives X-band linear frequency modulated signal with bandwidth of 3.6 GHz.
Keywords/Search Tags:photonic analog-to-digital converter, multichannel parallel de-multiplexing, sampling rate, the effective number of bits, radar transceiver
PDF Full Text Request
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