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为了提高运放的直流增益，采用了复制运放增益增强技术，这种技术的特点是在提高增益的同时不影响输出摆幅，非常适合低电压场合。
The replica-amplifier gain enhancement technique is applied to improve the DC gain of the amplifier, which does not degrade the output swing and is very suitable for low-voltage applications.
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