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U4 是两个运算放大器的 1.2V 参考电压。因此 1.2V 出现在 U3A-3 和 U3B-5。您还可以看到,当 VOUT = 3.3V 时,输出电压 (Vout) 被 R26 和 R27 分压以提供 1.2V U3B-6。