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