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6.9 抑制载波双边带调幅 ( DSB/SC AM) 解调电路 PowerPoint PPT Presentation


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6.9 抑制载波双边带调幅 ( DSB/SC AM) 解调电路. 要从抑制载波的双边带调幅波检出调制信号 来。从频谱上看就是将幅度调制波的边带信号不失真的搬到零频附近。因此 AM 波的解调电路(包括抑制载波的双边带调幅波的解调在内)也属于频谱搬移电路。需要用乘法器来实现这种频谱搬移作用,其电路如图6.9.1所示。. DSB/SC AM 波的 电压可表示为 :. 若. (6.9.1). 本机载波频率:. 两者相乘:.

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6.9 抑制载波双边带调幅 ( DSB/SC AM) 解调电路

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6 9 dsb sc am

6.9 DSB/SC AM


6 9 dsb sc am

AM6.9.1


6 9 dsb sc am

DSB/SC AM :

6.9.1


6 9 dsb sc am


6 9 dsb sc am

LPF


6 9 dsb sc am

a


6 9 dsb sc am

u (t)

LPF

b

6.9.1


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