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高场核磁共振波谱仪频率合成器设计

, PP. 91-99

Keywords: 核磁共振(NMR),频率合成器,锁相环,直接数字合成,低相位噪声

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Abstract:

提出了一种基于锁相环(Phase-lockedLoop,PLL)与直接数字合成(DirectDigitalSynthesis,DSS)等技术相结合的高场核磁共振波谱仪频率合成器设计方案.该系统以单片机为控制器完成算法运行、参数配置和CAN总线通信功能,运用PLL技术和DDS技术相结合的频率合成方案,通过两次混频,使频率粗调和细调灵活可控,实现宽带低噪声频率输出.将该频率合成器用于自主研制开发的核磁共振波谱仪上进行实验验证,测试得到的线形和灵敏度均达到指标要求,结果证明该设计方案具有可行性.

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