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Automatic Topology Selection and Sizing of Class-D Loop-Filters for Minimizing Distortion

Guilherme, DG ; Guilherme, J.G. ; Horta, N.

Automatic Topology Selection and Sizing of Class-D Loop-Filters for Minimizing Distortion, Proc International Workshop on Symbolic and Numerical Methods, Modeling and Applications to Circuit Design - SM2ACD , Gammarth, Tunisia, Vol. 1, pp. 1 - 4, October, 2010.

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Abstract
This paper presents an optimization methodology for continuous time loop-filters design applied to Class-D amplifiers. The methodology is based on an evolutionary optimization approach which integrates both the topology selection and circuit sizing by automatically generating optimal sized topologies and performance tradeoffs for the Class-D amplifier. The presented approach is demonstrated for the design of an half-bridge Class-D loop filter topology for portable applications that achieves less than 0.005% THD at 340mW output power with a 3.3V supply in typical 0.18um CMOS technology.