Different design configurations of charge pumps may include more than just two switches but charge pumps {HEAD ~ all} operate in {TAIL ~ principle} the same way 
operate in
Different design configurations of charge pumps may include more than just two switches but charge pumps { HEAD ~ all } operate in { TAIL ~ principle } the same way
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH