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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-input hysteresis comparator using floating-gate MOSFETs, the amplifier is capable of low voltage operation. On Alcatel 0.5 μm double poly CMOS process, this amplifier demonstrated up to 0.88W with 95% efficiency with a 2.8V 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.
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on (Volume:5 )
Date of Conference: 2002