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