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实现12v输入1.8v输出，R1,R2，Cff该如何选择？实现9v输入3.3v输出，Cff如何选择？
请参考下面的设计参数：
Vin=12V，Vout=1.8V，R1=301kohm，R2=240kohm，Cff=21pF
Vin=9V，Vout=3.3V，R1=576kohm，R2=180kohm，Cff=11pF
