The present system defines {HEAD ~ a different way} of making and operating a variation on {TAIL ~ a pinned photodiode} 
The present system defines { HEAD ~ a different way } of making and operating a variation on { TAIL ~ a pinned photodiode }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL