In particular, the present invention provides {HEAD ~ a circuit} having a voltage generator for producing {TAIL ~ blocking polarity voltage} 
In particular , the present invention provides { HEAD ~ a circuit } having a voltage generator for producing { TAIL ~ blocking polarity voltage }
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 TAIL