Reduction of spectral distortion in class D amplifiers by an enhanced pulse width modulation sampling process
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169 citations
Cites background or methods or result from "Reduction of spectral distortion in..."
...More recently, PWM has become important in e=cient energy processing and management in all types of communication systems and audio applications [5,10]....
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...n=1 Jn(k M) jk [{ (f − (kfc − nf1))− (f + (kfc − nf1))} +(−1)n{ (f − (kfc + nf1))− (f + (kfc + nf1))}]; (70) which is exactly the result obtained by the double Fourier series method in [2,10]....
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...This result matches those obtained in [2,10] by the double Fourier series method....
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...Previous studies [3,10], have used a double Fourier series method to obtain the spectrum of the PWM signal when the modulating signal is a pure sinusoid, that is, a single tone....
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130 citations
Cites background from "Reduction of spectral distortion in..."
...Since the square-wave Fourier series and transform are well known, knowledge of the signal-dependent spectrum will lead toPWM SQ ....
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Cites methods from "Reduction of spectral distortion in..."
...Similar approaches have been used in [ 8 ] and [9] to analyze the harmonic characteristics of an H-bridge converter....
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64 citations
Cites background from "Reduction of spectral distortion in..."
...Note that we have not included the double Fourier series expression for the LI given in reference [4] due to its imprecision....
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...The reported sampling processes for the algorithmic PWM methods include the linear interpolation (LI) [4], [5], pseudonatural PWM [5], static-filter PWM [8], weighted PWM and its variants [9], derivative PWM [10], parabolic correction PWM [23], prediction correction PWM [28], [29] and more recently, our earlier proposed Delta compensation ( C) PWM [11] sampling processes....
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...LI is arguably first reported in [4] but inadvertently for and in [22] instead of ; we can show that and are poorly optimized, resulting in high nonlinearities....
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...The time-domain pulsewidth expressions reported in [4] [see (2a)] and in [5] [see (2b)] are somewhat different due to the different normalizations (equivalent to the bounded range) assumed for...
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...It is interesting to note that reported work on the LI process [4], [5], [22], the mechanisms for the nonlinearities of the LI process, in particular the harmonic distortion and foldback distortion, are not well understood; the reported double Fourier series expression [4] for the LI process is imprecise....
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References
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