Referring now to FIG 1 {HEAD ~ an input digital word}, representing a desired carrier frequency, is input to {TAIL ~ an adder} 12 
is input to
Referring now to FIG 1 { HEAD ~ an input digital word } , representing a desired carrier frequency , is input to { TAIL ~ an adder } 12
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH