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