A capacitor is coupled to the source of current to receive {HEAD ~ current} therefrom, thereby forming {TAIL ~ an integrating circuit} 
forming
A capacitor is coupled to the source of current to receive { HEAD ~ current } therefrom , thereby forming { TAIL ~ an integrating circuit }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL