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