Further, as a voltage measuring means for measuring a voltage at {HEAD ~ the other end T2} of {TAIL ~ the reference capacitor Cs}, a comparator COMP is provided at the other end T2 
Further , as a voltage measuring means for measuring a voltage at { HEAD ~ the other end T2 } of { TAIL ~ the reference capacitor Cs } , a comparator COMP is provided at the other end T2
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH