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LMH6518: 缓冲驱动电路疑问,LMH6518手册的P34页的电路???

Part Number: LMH6518

红框2 中R22, R15,R11,c3是怎样工作的? 下面的  Gain(DC) = ....   (18)怎么理解, R1 || R2看不懂啊???  有个设计中用此电路驱动lmh6518,别的部分都理解 就是红框2中的运放是怎么调节 JFET-N的输入的比较含糊,请教一下???