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Dear editor,rnLow power transceivers are essential in the wireless personal area network(WPAN)applications[1].To reduce transceivers'power in standby mode,wake-up receivers(WuRx's)are now widely used in WPAN applications[2].Those WuRx's are always-on in the system and are usually powered by batteries.A compact low-dropout(LDO)volt-age regulator with very small quiescent current is required to convert the battery voltage to the de-sired working voltage.