The four analog switches are also connected to a controller which provides {HEAD ~ control signals} to {TAIL ~ the switches} to separately activate each switch 
to
The four analog switches are also connected to a controller which provides { HEAD ~ control signals } to { TAIL ~ the switches } to separately activate each switch
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 OTH OTH OTH OTH OTH