Therefore {HEAD ~ this circuit} produces {TAIL ~ a digital ramp signal} with a slope and frequency proportional to the numerical value of the input digital word 
produces
Therefore { HEAD ~ this circuit } produces { TAIL ~ a digital ramp signal } with a slope and frequency proportional to the numerical value of the input digital word
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH