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FFT需要满足采样率需要大于信号带宽的两倍，否则FFT后结果会有偏差。
信号带宽估算为0.5/TR(TR指上升沿)，那么采样率需大于2*信号带宽=1/TR。又因采样率=采样点数/采样时间。采样时间=stop-start。所以要求[2*(maxF/deltaF）+1]/(stop-start)需大于1/TR
其实默认将max freq尽量调大就好
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