PWM and comparing waveform (sawtooth or triangle)

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rtarbell

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Joined 2005
This could be under power supplies as well...

I was wondering, when using PWM (either for designing a SMPS, or a modulated waveform, as in a class-D amplifier), some circuits compare the input waveform with a triangle wave, and other circuits compare the input waveform with a sawtooth wave.

What is the difference, and when would you use one or the other?
 
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