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