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5 振幅调制、解调和混频电路

5 振幅调制、解调和混频电路. 振幅调制的基本原理 相乘器电路 振幅调制电路 振幅检波电路 混频电路. 1. 振幅调制的基本原理. 振幅调制简称调幅 普通调幅 (AM) ： Amplitude Modulation 含有载波的幅度调制 (AMWC) Amplitude Modulation With Carrier 双边带调幅 (DSB) ： Double Sideband Modulation 单边带调幅 (SSB) ： Single Sideband Modulation. 普通调幅波 (AM) . 普通调幅波 (AM) .

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5 振幅调制、解调和混频电路

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  1. 5 振幅调制、解调和混频电路 • 振幅调制的基本原理 • 相乘器电路 • 振幅调制电路 • 振幅检波电路 • 混频电路 1

  2. 振幅调制的基本原理 振幅调制简称调幅 • 普通调幅(AM)： Amplitude Modulation 含有载波的幅度调制(AMWC) Amplitude Modulation With Carrier • 双边带调幅(DSB)： Double Sideband Modulation • 单边带调幅(SSB)： Single Sideband Modulation

  3. 普通调幅波(AM)

  4. 普通调幅波(AM) 更广泛一点，调制信号是非周期信号 uΩ(t) 则：

  5. O t O t O U cm t O t 普通调幅波(AM) uΩ(t) 1 -w w w 0 H H cosωct p p U cm uAM(t) 1 2 w 0 w c

  6. 普通调制波——单频调制 如果调制信号uΩ(t)是单一频率的余弦波 调幅波为： 其中： 对于普通调制波：

  7. 普通调制波——单频调制

  8. 普通调制波——复杂信号调制 对于周期性的复杂信号，我们可以利用傅里叶变换进行信号分解 于是有：

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