Most of the analog circuit testable design based on boundary scan which still uses the analog test bus prescribed by IEEE1149. 4 standard has not been realized the built-in-test design actually. The extraction and comparison of analog signal are difficult. According to these problems, a design of BIT structure for analog circuit based on boundary scan is presented, which takes the rectangular pulse as actuator and uses analog switch as auxiliary bridge. Each module function timing results show the rationality of the design, and to integrate op-amp uA741 as measured circuit, the pulse count of the signal rising edge fully proves the feasibility of the structure.%边界扫描技术在模拟电路的可测性设计大多仍停留在IEEE1149.4标准所规定的模拟测试总线上,并没有做到真正意义上的内建自测试设计；针对模拟电路信号提取和比较相对困难的测试难点,提出采用方波脉冲作为测试激励信号的方法,并以模拟开关为辅助桥梁,设计了基于边界扫描的模拟电路BIT结构；通过各个模块功能的时序仿真证明了该结构设计的合理性,并以集成运放uA741作为被测电路,通过信号上升沿脉冲计数充分证明该结构的可行性.
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