a digital to analog {HEAD ~ converter} that converts {TAIL ~ the digital output signal} into an analog output signal, wherein 
a digital to analog { HEAD ~ converter } that converts { TAIL ~ the digital output signal } into an analog output signal , wherein
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH