Aod 是开环差模扩大倍数，输入信号是两个输入端电压的差值。
14 = 5 * 10^5 * Ui
Ui = 2.8 * 10^-5
+Uim = 2.8 * 10^-5
-Uim = - 2.8 * 10^-5
差模输入电压 Uid = (Uin+) - (Uin-) 的绝对值要小于 2.8 * 10^-5
14 = 5 * 10^5 * Ui
Ui = 2.8 * 10^-5
+Uim = 2.8 * 10^-5
-Uim = - 2.8 * 10^-5
差模输入电压 Uid = (Uin+) - (Uin-) 的绝对值要小于 2.8 * 10^-5
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