各位技术支持大大，我司用ADS1298做了一款标准12导联产品，在输入阻抗方面实测过小，不合格，改进哪些参数会好些？
测试电路附件可见。要求10M输入阻抗，串联620k时，标准电压的幅值减小不超过6%，实际上串入电阻后幅值减小超过了20%，阻抗应该远不到10M。
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ADS1298产品输入阻抗不够大
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