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请问前级放大电路和中间级放大电路使用哪款运放比较合适。
亲；OPA2189有两通道极低失调（3uV）和漂移（5nV/C）的运放，一片IC直接做前放和中放即可。
前级放大电路主要考虑运放的输入失调电压，输入噪声都要小。
