That circuit isn't suitable for a class D amplifier. Here are some more tutorials:
https://www.infineon.com/dgdl/an-1071.pdf?fileId=5546d462533600a40153559538eb0ff1
http://www.irf.com/product-info/audio/classdtutorial.pdf
https://www.infineon.com/dgdl/an-1071.pdf?fileId=5546d462533600a40153559538eb0ff1
http://www.irf.com/product-info/audio/classdtutorial.pdf
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See the Design Example here: http://www.irf.com/product-info/audio/classdtutorial.pdf
It doesn't say anything about the effects of an opamp used for error correction. I also don't understand why the example circuit shown is using the PWM signal instead of the analog output signal as feedback. It's not going to error correct the absolute signal output that way.
The output filter is passive, and ideally has only linear distortion (aka controlled frequency response). Phase response must be nonlinear in a filter. A first order filter has an arctangent phase curve. Linear phase only delays the original waveform, and an all-pass filter can be used to alter the phase response of a filter without altering its amplitude response.
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Here is some background.
New supply tracking technology for Class D
DSpace@MIT:
A class-D-tracking-rail class-A audio power amplifier
Welcome to AUDERA
Novel Tracking Power Supply for Linear Power Amplifiers - IEEE Journals & Magazine
Improving the efficiency of class-D audio amplifier systems using envelope tracking DC-DC power supplies - Semantic Scholar
http://download.yamaha.com/api/asse...ite-master.prod.exp.yamaha.com&asset_id=53052
New supply tracking technology for Class D
DSpace@MIT:
A class-D-tracking-rail class-A audio power amplifier
Welcome to AUDERA
Novel Tracking Power Supply for Linear Power Amplifiers - IEEE Journals & Magazine
Improving the efficiency of class-D audio amplifier systems using envelope tracking DC-DC power supplies - Semantic Scholar
http://download.yamaha.com/api/asse...ite-master.prod.exp.yamaha.com&asset_id=53052
They use the output filter as part of the design, so that is an advantage. This is one commercial approach.
(PDF) Simple Self-Oscillating Class D Amplifier with Full Output Filter Control
(PDF) Simple Self-Oscillating Class D Amplifier with Full Output Filter Control
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