HighSNRCapacitive Sensing Transducer
MuhammadS . Qureshi, Paul E. Hasler, Levent F. Degertekin · 2006
Thispaperdescribes a highsignal-to-noise ratio capacitive sensing transducer withhighpowerefficiency andhighcl areaefficiency. Thecircuit isanexample ofcapacitive circuit and v. 0V isbased onacapacitive feedback charge amplifier. 78.6dB SNRinCl audio bandisachieved withless than0.51iWpowerconsumption C- - volt bymakinguseofafloating-gate transistor. Thisdesign gives us theflexibility ofcontrolling thecharge onthefloating node.The + microphone sensor isinterfaced withtheamplifier tomeasure theperformance ofthetransducer. Vt nc1c2