Abstract
This paper presents a design methodology for high-order class-D amplifiers, based on their similarity with sigma---delta ( $$\Upsigma\Updelta$$ Σ Δ ) modulators, for which established theory and toolboxes are available. The proposed methodology, which covers the entire design flow, from specifications to component sizing, is validated with three design examples, namely a second-order, a third-order, and a fourth-order class-D amplifier. Moreover, the third-order class-D amplifier has been integrated on silicon and characterized, further confirming the validity of the whole design flow. The achieved results demonstrate that high-order class-D amplifiers can achieve total-harmonic-distortion (THD) performance compatible with the specifications of high-end audio applications (THD ? 90 dB), which would be unfeasible with conventional first-order class-D amplifiers.
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