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CC2540 使用DCDC供电问题

Other Parts Discussed in Thread: TPS61040, CC2541

在使用TPS61040作为CC2541的电源供电应用时,DCDC的输入电压为2V,输出电压为3.3V,给CC2541供电,模块无法发射广播信号,在DCDC的输出端和CC2541电源输入端串联4欧姆电阻,蓝牙模块就可以工作。已经测试过不是电源纹波的问题。请问有知道什么原因么?