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OPA210: 有限开环增益仿真 / 输出摆幅

Part Number: OPA210


Hi all,

Question 1:阅读TI资料“运算放大器失调电压和偏置电流限制”一文中,有如下疑问,请您帮忙答疑解惑,期待您的回复,感谢您

①为什么资料中仿真Aol参数,采用闭环系统,而非开环系统,Aol定义式:▲Vout = Aol * ▲Vos

②如上图3-1,采用闭环系统仿真Aol,以下理解是否准确:Vout = (Vin - Vos)/ Rg * Rf + Aol * Vos,等式两边对时间求导,Vin取定值,▲Vout = -Rf / Rg * ▲Vos + Aol * ▲Vos = (Aol-Rf / Rg)* ▲Vos 

Question 2:OPA210,轨到轨,±15V电源轨,为什么下图6-30的输出信号峰峰值超过了30V