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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 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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slide2
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。
slide4

本机载波频率:

两者相乘:

slide5
其中第一项包含了所需的调制信号,第二项则是载频为的双边带调制信号,用低通滤波器(LPF)将它滤除,即可得到所需调制信号。
slide6

(a)用乘法器组成的抑制载波

双边带调幅调制与解调电路

slide7

解调器输入u (t)

解调器LPF输出

(b)解调器输入和输出波形

图6.9.1用乘法器组成的抑制载波

双边带调幅调制与解调电路

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