本文提出了一種符合HART 通信協(xié)議的全數(shù)字調(diào)制解調(diào)芯片設(shè)計(jì)方案。調(diào)制部分實(shí)現(xiàn)CPFSK 調(diào)制，對傳統(tǒng)的DDS 技術(shù)進(jìn)行改進(jìn)，使其數(shù)字部分的雜散性能改善且具有較低的相位連續(xù)誤差。解調(diào)部分實(shí)現(xiàn)CPFSK 解調(diào)，利用數(shù)字濾波技術(shù)使其具有良好的解調(diào)精度和抗干擾能力。性能分析和仿真結(jié)果表明，芯片具有良好的性能。
關(guān)鍵字：HART；連續(xù)相位頻移鍵控；直接數(shù)字頻率合成器；調(diào)制；解調(diào)
Design of Modem Chip Based On HART Communication Protocol Yu Xiao-yi1, 2 Yang Zhi-jia1 ( 1. Shenyang Institute of Automation of the Chinese Academy of Sciences, Shenyang, 110016) (2. Graduate School of the Chinese Academy of Sciences, Beijing, 100039) Abstract: This paper presents a design scheme of digital modem based on HART communictaion protocol. For the modulation part of the design, traditional DDS technology is improved to implement CPFSK modulation. As a result, the performance of spur and error of digital part are optimized. In the demoduation part, CPFSK demodulation is implemented and digital filters are adopted to get good precision and strong ability of anti-jamming. According to performance analysis and simulation results, the advantages of the design scheme above are proved.
Key words: HART ; CPFSK; DDS ;Modulate;Demodulate