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MCU内部石英晶体振荡电路详细原理图?

谁能发个MCU内部详细的石英晶体振荡电路,这个电路应该不只有一个反向器吧,还有这个系统的增益只有1,为什么能从一开始的小信号放大起来,如果增益只有1,那这个信号一直没法放大啊,还有从晶体输出到晶体输出这个180度的相移是怎么产生的?哪位高手给解答下