Objective The driven-right-leg(DRL)circuit is very important in reducing the
50Hz common mode voltage in biopotential measurements,however the main parameters in DRL
circuit are not chosen certainly.This article studies the selection of the main parameters
in DRL circuit.Methods We deduced the formula on reducing 50Hz common-mode interferences in
DRL circuit,and given some advices related to choosing the parameters for DRL 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 DRL circuit is
important for using DRL circuit in biopotential measurements.
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