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Output Filter Solutions for Class D Power Amplifiers: Analysis, Characterization and Recent Developments

Ferreira, C. ; Borges, B. ; Sá, L. V.

Output Filter Solutions for Class D Power Amplifiers: Analysis, Characterization and Recent Developments, Proc AES - Conf. Class D Audio Amplification, Hillerød, Denmark, Vol. -, pp. - - -, August, 2009.

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Abstract
This paper focus class D amplifiers output filter topology’s and characterizes the tradeoffs in its design: output ripple, negative feedback loop gain, bandwidth, attenuation of differential/common components, and minimization of the system gain variation in face of load impedance changes. The paper then describes, evaluates and compares recent developments on class D output filter topologies by analyzing its design principles, advantages and drawbacks.