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