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Multimedia Courseware of High Frequency Electronic Circuits

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Presentation on theme: "Multimedia Courseware of High Frequency Electronic Circuits"— Presentation transcript:

1 Multimedia Courseware of High Frequency Electronic Circuits
高频电子线路多媒体教学课件 Multimedia Courseware of High Frequency Electronic Circuits 西安电子科技大学 电子工程学院 赵建勋

2 知识点19 振幅解调原理和电路(第九讲) 例6. 振幅解调电路如图所示 (1) us = uSSB = Usmcos(wc+W)t, ul = Ulmcoswct, Ulm>>Usm (2) us = uAM = Usm(1 + macosWt)coswct , ul = 0 ; 推导uo表达式,判断能否实现解调。

3 知识点19 振幅解调原理和电路(第九讲)

4 知识点19 振幅解调原理和电路(第九讲) 当uAM1 > uAM2时, VD2截止,VD1、C和R 构成对uAM1的峰值包络 检波器,反之同理。 即该电路对较大的uAM作 包络检波。

5 知识点19 振幅解调原理和电路(第九讲) (2) uo = kdUlm(1 + D|cosWt|)不能实现解调。

6 知识点19 振幅解调原理和电路(第九讲) uo = kdUsm(1 + macosWt) 能够实现解调


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