目的 右腿驱动(driven-right-leg,DRL)电路是生物电采集中降低共模电压的重要方法,但是DRL电路的参数选取尚有分歧,本文探讨了DRL电路中主要参数的选取问题.方法 首先通过研究DRL电路抑制50Hz共模电压的动态过程,给出了DRL电路主要参数选取的合理建议,并用一组参数进行了实验测试.结果 本文建议的DRL电路参数可以在确保人体安全的前提下将共模干扰电压降至最低.结论 DRL电路参数的确定,对在生物电采集中使用DRL电路具有重要作用.%Objective The driven -right-leg (DHL) circuit is very important in reducing the 50 Hz common mode voltage in biopotential measurements, however the main parameters in DHL circuit are not chosen certainly. This article studies the selection of the main parameters in DHL circuit. Methods We deduced the formula on reducing 50 Hz common-mode interferences in DHL circuit, and given some advices related to choosing the parameters for DHL circuit. Some experiments were completed to investigate the advices. Results It is believed that the advices proposed can make sure the security of patients and weaken the common voltage to the least level. Conclusions The ascertainment of the main parameters in DHL circuit is important for using DHL circuit in biopotential measurements.
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