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近年来,人们在临床诊断和医学研究中普遍将生物电放大器与微机连接,进行信号的实时测量和分析。微机系统公共地线上的回流干扰时常影响高输入阻抗、高增益的生物电放大器正常工作,放大器输入共模干扰电压V_n可用下式表示V_n=i_d·Z_g·[1/(CMRR)+Z_e_1)/(Z_C_1+Z_e_1)-(Z_e_2)/(Z_C_3+Z_e_2]式中i_d为流经接地电极的位移电流;Z_g为接地电极砠抗,Z_e_1和Z_e_2为信号电极阻抗;
In recent years, people in the clinical diagnosis and medical research generally bioelectric amplifier connected with the computer, real-time signal measurement and analysis. The return current interference on the common ground of the computer system often affects the high input impedance and high gain of the bioelectric amplifier. The common mode interference voltage V_n of the amplifier can be expressed as V_n = i_d · Z_g · [1 / (CMRR) + Z_e_1) Where Z_g is the ground electrode resistance, Z_e_1 and Z_e_2 are the signal electrode impedances, and Z_e_1 and Z_e_2 are the signal electrode impedances; Z_c_1 + Z_e_1 - Z_e_2 / Z_c_3 + Z_e_2, where i_d is the displacement current flowing through the ground electrode;