【摘要】 从体表获得的心电信号经导联输入后,由模拟多路开关进行切换,经前置放大器放大及滤波器滤除高频干扰后,再经一个50Hz陷波器进一步抑制电源干扰,然后通过电平位移进入A/D转换得到数字化的心电信号。以BiFET LF411型运放构成的前置放大器和以有源高通-低通滤波器为主要部件的高性能心电放大器可实现输出电压高增益、低噪声、高灵敏度,保证心电信号清晰稳定,满足临床监护以及病理分析的要求。更多还原

【Abstract】 The electrodermal signal which is transmitted by a multiplex selector can be enlarged first transited a preamplifier, next passed a band-pass filter in order to separate high-frequency interfere, and then through a 50Hz noise rejector, finally the digital signal of Electrocardiogram can be gained. The design of Electrocardiogram Amplifier (ECG) is mainly consisted of a preamplifier and a band-pass filter, which is made up of four BiFET LF411 operational amplifiers, some resistances and capacitances. It can achieve high gain, high sensitivity and low noise. It can make electrocardiogram stable and clear.更多还原