D.A.(Tony)Stewart
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Is the signal seen by the left hand side on the inductor a 300Khz switched audio signal, as in isn't it basically the 300Khz signal being switched to produce the audio signal??? Below is the signal on the inductor
View attachment 123103
Isnt this why the LP filter is used to remove this 300KHz?
Yes the PWM of the triangle yields an AC component from the modulator which shifts the threshold of the comparator.
Your waveform looks at the differential input with the slicer being at 0V so in this case it swings full scale with no DC offfset.
It's not really accurate to model the frequency reponse of a reactive filter unless you consider the reactive impedance of a dynamic speaker.
But I suppose accurate enough for government work.