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有哪些运放是超低偏置电流适合用在ph电极 前置信号提取
亲；一般，CMOS和BiMOS工艺运放是极低偏置电流的。这种放大器也有高低频和高低噪音之分。你打算做什么？建议有明确的技术指标。
OPA657，OPA847，LMP7721，不知你的放大倍数，信号频率多少
可以参看下这篇app notehttp://www.ti.com.cn/cn/lit/an/snoa529a/snoa529a.pdf
