Currents from {HEAD ~ the sources} selected by {TAIL ~ the switches} are combined, and the total current is mirrored to the charge pump 
selected by
Currents from { HEAD ~ the sources } selected by { TAIL ~ the switches } are combined , and the total current is mirrored to the charge pump
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH