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用MSP430G2553的AD进行采样,为什么采样的频率越高,采样的波动范围越大
你好,请注意一下采样保持时间,在ADC10CTL0寄存器里设置:
你好!
能否提供你实测的数据供大家分析。
设置一个较长的采样保持时间,可以使信号采出来更稳定,但是注意要满足采样定律。
Regards,
Hardy
注意,AD的采集是基于电容的充电,也就是说如果信号源的输出阻抗太大,采样率越高,电容的充电就少,采集的数据波动性就会增大!