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ADS1292R输入信号幅值较小,如何测其频谱?且让波形显示明显?

Other Parts Discussed in Thread: ADS1292R

输入心电信号幅值太小,一般都是几毫伏,相较基准电压2.42太小,如何对其进行fft运算,算其频谱、频率等。且ADS1292R的精度为24位AD,想让测量信号的波形在TFTLCD上显示,波形变化都太不明显,这些该如何解决,是在前级加运放吗?如果要加是不是得加2~3个运放来放大心电信号,分别放大RL、RA、LA信号进而进行测量?