Each current control stage includes first, second, and third terminals, and means for conducting {TAIL ~ current} between the first and second terminals in {HEAD ~ response} to a control signal present at the third terminal 
Each current control stage includes first , second , and third terminals , and means for conducting { TAIL ~ current } between the first and second terminals in { HEAD ~ response } to a control signal present at the third terminal
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH