Mr. Graham Maynard mentioned the importance of minimum phase shift (at 20khz being benchmark) for good sounding power amp. But he always use JLH topology.
I read this app note from Analog Device, the number is AN-107, title "Active Feedback Improves Amplifier Phase Accuracy". The "Active Feedback" here is using opamp, not like Scott Wurcer's thread.
In this app note, it shows that if we put 1 or 2 opamps in the feedback path, it can reduce phase shift dramatically, like in table 1 of the app note (from -5.7deg to -0.006deg at 50khz)
If this is the same thing with what Mr. Maynard saying, then this trick can be used to any power amp, not necessarily using JLH topology. Anyone has tried this? Does it making better sounding power amp?
PS. I have the copy of the AN-107, but the pdf is sized of 778kb, how to show it here?
I also wonder, why AN-107 disappears from Analog Device's website. Does this AN-107 defective/not working?
I read this app note from Analog Device, the number is AN-107, title "Active Feedback Improves Amplifier Phase Accuracy". The "Active Feedback" here is using opamp, not like Scott Wurcer's thread.
In this app note, it shows that if we put 1 or 2 opamps in the feedback path, it can reduce phase shift dramatically, like in table 1 of the app note (from -5.7deg to -0.006deg at 50khz)
If this is the same thing with what Mr. Maynard saying, then this trick can be used to any power amp, not necessarily using JLH topology. Anyone has tried this? Does it making better sounding power amp?
PS. I have the copy of the AN-107, but the pdf is sized of 778kb, how to show it here?
I also wonder, why AN-107 disappears from Analog Device's website. Does this AN-107 defective/not working?