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This paper presents a design of an output stage based on Class-D amplifier techniques using Rectangular Wave Delta Modulation (RWDM) topology. This amplifier has a simple structure comprised only of a hysteresis comparator and output drivers. Thanks to the use of a multiple inputs hysteresis comparator using floating-gate MOSFETs, the amplifier is capable of low voltage operations. On Alcatel 0 . 5~ double poly CMOS process, this amplifier demonstrated to deliver up to 0.88Watts with 95% eficiency with a 2.8 Volts power supply. This means implementation as a monolithic chip is possible, making this amplifier suitable for portable applications such as speaker driving circuits in mobile phones, hearing aids and other implantable medical devices.

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