CAJ | 학술논문

现有声表面波( SAW)生物传感器件检测方法需要借助网络分析仪等专业检测设备，且在闭环检测中存在相位噪声和频率稳定性等问题。讨论了一种采用直接数字式频率合成( DDS)技术产生激励源实现开环检测的方法，并对DDS实际输出信号频谱进行了分析，证明了由相位截断引入的基频附近的杂散分量不会对检测结果产生影响。为验证可行性，设计了以AD9858和AD8302为核心的扫频检测系统。测试结果表明，该系统能够完成设计频率为198 MHz的SAW生物传感器的测频功能。
현유성표면파( SAW)생물전감기건검측방법수요차조망락분석의등전업검측설비，차재폐배검측중존재상위조성화빈솔은정성등문제。토론료일충채용직접수자식빈솔합성( DDS)기술산생격려원실현개배검측적방법，병대DDS실제수출신호빈보진행료분석，증명료유상위절단인입적기빈부근적잡산분량불회대검측결과산생영향。위험증가행성，설계료이AD9858화AD8302위핵심적소빈검측계통。측시결과표명，해계통능구완성설계빈솔위198 MHz적SAW생물전감기적측빈공능。
Existing detection methods for surface acoustic wave ( SAW) biosensors, request the aid of professional test equipment including network analyzer, etc. , and it exists the issues of phase noise and frequency stability in closed loop detection. The method by using direct digital synthesis ( DDS) technology to generate excitation source for implementing open loop detection is discussed. The actual signal output frequency spectrum of DDS is analyzed;it is proved that the spurious components near the fundamental frequency caused by phase truncation may not affect the detection result. In order to verify the feasibility, the sweep frequency detection system with AD9858 and AD8302 as the core is designed. The test results show that the system can complete the frequency measurement function for the SAW biosensors with designed frequency of 198 MHz.