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运放输入端如何保护?比如TL064。

Other Parts Discussed in Thread: TL064

请问Fig1中的R1是怎样保护运放的?Fig2中的R2会不会是画蛇添足?TL064的输入阻抗为10的12次方欧姆。

希望TI能给菜鸟一个回复。