One of three AGC windows can be selected through associated register according to {HEAD ~ one embodiment} of {TAIL ~ the present invention} 
of
One of three AGC windows can be selected through associated register according to { HEAD ~ one embodiment } of { TAIL ~ the present invention }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL