PAPER SESSION 3: METHODS AND TOPOLOGIES



A Simple Post-Filter Feedback Topology for Class-D Amplifiers


Charles Lehmann
Berne, Switzerland


A feedback topology shall be proposed that allows the straightforward inclusion of the output filter into the feedback loop. It can be adapted to high- or low-Q output filters equally well. It is not restricted to either self-oscillating or carrieróbased modulator topologies. One advantage is that the slew-rate requirements on the operational-amplifiers used for the proposed topology are quite relaxed since they are not forced to handle fast transients. Another advantage is that the feedback branch is based on resistors only.


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