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ADS1292 输入阻抗提升问题

Other Parts Discussed in Thread: ADS1292, OPA735, OPA820, OPA227

TI专家好,我公司使用ADS1292 设计了一款单导联心电(无RLD),样机经测试输入阻抗在10M到20M之间,我们希望能进一步提高该指标,请问在前端电路设计上我们还可以如何改进?  谢谢~