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Simple Self-Oscillating Class D Amplifier with Full Output Filter Control

A stable and load-invariant self-oscillation condition is developed for a class D amplifier employing only one single voltage feedback loop taking off after the output filter. The resulting control method is shown to effectively remove the output filter from the closed loop response. Practical discrete implementations of a comparator and gate-drive circuit are presented. A high-performance class D amplifier employing only 16 discrete transistors is constructed. Higher-order extensions of the control circuit are demonstrated which produce extremely low levels of distortion.

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