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THS452X与ads1278的配合使用,如何将THS452X的输入阻抗做到1M?

Other Parts Discussed in Thread: OPA1632, ADS1278, THS4524

问题如题,另外我现在按照上图电路做,并将输两入端同时接地测试到的差分输出噪声为30uV峰峰值,因为我的最终应用要求输入端为单端模式,并且输入阻抗要求为1MΩ;需要如何改进?