本文提出了一種符合HART 通信協議的全數字調制解調芯片設計方案。調制部分實現CPFSK 調制，對傳統的DDS 技術進行改進，使其數字部分的雜散性能改善且具有較低的相位連續誤差。解調部分實現CPFSK 解調，利用數字濾波技術使其具有良好的解調精度和抗干擾能力。性能分析和仿真結果表明，芯片具有良好的性能。
關鍵字：HART；連續相位頻移鍵控；直接數字頻率合成器；調制；解調

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