一种用于神经肌肉疾病评估系统的幅相测量电路的设计

Amplitude and phase measurement circuit design used on neuromuscular disease assessment system

神经肌肉疾病评估系统的关键是能同时准确提取幅值和相位信息。利用AD8302的高度集成特性设计了一种幅相测量电路。给出了电路原理图,详细论述了测量频率为50 kHz时,幅相测量电路设计的具体方法。性能分析结果表明,幅值和相位的测量性能与额定值比较接近。在±20 dB范围内,幅值测量精度在±0.5 dB以内;在±90°范围内,相位测量精度在±0.9°以内。

Accurately picking up amplitude and phase at the same time is essential for neuromuscular disease assessment system. Based on the feature of highly integration of AD8302, a circuit to measure amplitude and phase was designed in this research, and the schematic diagram was provided. The method of circuit design was provied in detail with the frequency of 50 kHz. As a result of performance analysis of this system, the measured value of amplitude and phase is approach to rated value： 0.5 dB accuracy was achieved over a 20 dB range when measuring gain. Phase accuracy was 0.9° for a 90° range.