The parallel connected differential CMOS sections of each variable delay element are controlled by {TAIL ~ a differential control voltage} whose magnitude sets {HEAD ~ relative levels} of operation of the two differential sections of each variable delay element 
The parallel connected differential CMOS sections of each variable delay element are controlled by { TAIL ~ a differential control voltage } whose magnitude sets { HEAD ~ relative levels } of operation of the two differential sections of each variable delay element
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH