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中文摘要：
为了实现生物电阻抗测量系统功能抽象设计的通用性、互用性和可移植性，运用抽象化的思想，将生物阻抗测量系统抽象为信号源模块、激励选通模块、测量选通模块和解调模块。在信号源模块、激励选通模块和测量选通模块中，采用单片机为主控单元，通过设计通用的接口电路和通信协议，实现了数据交换的一致性；在解调模块中，设计了一种能对混频信号解调的乘法解调电路。最后利用抽象化的功能模块构建了双频混频激励下的生物电阻抗测量系统。
英文摘要：
In order to implement universality, interoperability and transplantability in bioelectrical impedance measurement system, using the idea of abstract, this paper divides the system into four parts ： signal source module, excitation selection module, measurement selection module and demodulation module. In the signal source module, excitation selection module and measurement selection module, MCUs （Micro Controller Unit） are used as the main con- trol unit. The universal interface circuit and communication protocol are designed, which implements the uniformity of the data exchange. The multiplication demodulation circuit, which can demodulate the mixed frequency signal, is designed in the demodulation module. Finally, a mixed frequency bioelectrical impedance measurement system was constructed using these abstract modules.
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