The Frequency Spectrum of PulseWidth Modulated Signals

kimi_cxl · 发表于 2011-7-28 12:40:35

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关键词：PWM频谱，自然采样，均匀采样，单边调制，双边调制

Abstract
The determination of the frequency spectrum of a pulse width modulated (PWM) signal
with general band-limited input x(t)has been an open problem for many years.We describe
a new approach that gives exact analytical expressions for the spectra of uniform-sampling
PWM signals and natural-sampling PWM signals with single-edge as well as with doubleedge
modulation. For the special case of single tone modulating signals, our results reduce
to those obtained previously using a double Fourier series method. We also show that if the
maximum magnitude of the derivative of x(t)is smaller than twice the carrier frequency,
then a PWM signal consists of a baseband signal y(t)together with y(t)phase-modulated
onto each carrier harmonic, where, for uniform-sampling PWM, y(t)is a nonlinear function
of the modulating signal x(t), while for natural-sampling PWM, is just x(t)itself, that
is, there is no distortion in the baseband when natural sampling is used.

kimi_cxl · 发表于 2011-7-28 12:53:49

The frequency spectrum of pulse width Modulated signals.pdf (296.13 KB, 下载次数: 45 )
重传附件，刚才貌似没成功的嘛

mypcbok01 · 发表于 2011-7-28 15:55:40

非常感谢

zain · 发表于 2011-7-28 23:41:53

顶一个下来看先

vensen · 发表于 2011-7-31 10:13:04

谢谢共享

hao55555 · 发表于 2011-8-4 06:01:56

Thanks

11m · 发表于 2011-9-1 22:25:03

非常需要这样的文章。

wrzyred123 · 发表于 2013-8-12 10:22:17

dinging

jingxin_xd · 发表于 2019-4-18 23:59:43

非常感谢!!!

joshuacp · 发表于 2019-4-19 07:47:35

Good.

[资料] The Frequency Spectrum of PulseWidth Modulated Signals

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