1Broughton R S.Adaptive clock duty cycle controller: U.S.Patent 5,315,164[P]. 1994-5-24.
2Zhang X,Maksimovic D.Digital PWM/PFM controller with input voltage feed-forward for synchronous buck converters[C]//Applied Power Electronics Conference and Exposition,2008.APEC 2008.Twenty-Third Annual IEEE. IEEE,2008:523-528.
3Dini M,Filippi M,Tartagni M,et al.A nano-power power management IC for piezoelectric energy harvesting applications[C]//Ph.D.Research in Microelectronics and Hectronics(PRIME),2013 9th Conference on./EEE,2013: 269-272.