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关于运放的一个基础性问题

Other Parts Discussed in Thread: OPA2277, OPA2188, OPA2170

在开发中遇到个小疑问,A图和B图似乎理论上都能实现跟随或放大功能,一般我们绘制电路图时常会使用A图,请问B的方法有没有什么问题呢?请大神指教。