Design and analysis of a micropower low-voltage bang-bang control class D amplifier

Abstract

We describe the design of a novel bang-bang control class D amplifier for low-voltage power-critical applications, including hearing instruments (hearing aids). We analyze the design parameters for the amplifier and determine the relationships between these parameters. The relationships derived herein provide good insight to the design of the amplifier to meet a given specification. We verify our theoretical analyses of some of the design parameters by comparing them against computer simulations. We also show that our bang-bang control class D amplifier features micropower dissipation, low harmonic non-linearities and is suitable for hearing instruments.