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430f149频率测量波形转换求助

borui xiao
Intellectual 330 points
Other Parts Discussed in Thread: MSP430F149

频率测量我是用定时器a的捕获来实现的。输入信号为幅值0.5-5v的正弦信号，频率5-50k。怎样设计电路让最小幅值0.5v的正弦信号放大到430定时器a可以捕获的范围。电源供电是usb的5v供电。