Title :
High SNR capacitive sensing transducer
Author :
Peng, Sheng-Yu ; Qureshi, Muhammad S. ; Hasler, Paul E. ; Hall, Neal A. ; Degertekin, F.L.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA
Abstract :
This paper describes a high signal-to-noise ratio capacitive sensing transducer with high power efficiency and high area efficiency. The circuit is an example of capacitive circuit and is based on a capacitive feedback charge amplifier. 78.6dB SNR in audio band is achieved with less than 0.5 muW power consumption by making use of a floating-gate transistor. This design gives us the flexibility of controlling the charge on the floating node. The microphone sensor is interfaced with the amplifier to measure the performance of the transducer
Keywords :
amplifiers; capacitive sensors; circuit feedback; low-power electronics; microphones; audio band; capacitive circuit; capacitive sensing transducer; charge amplifier; floating-gate transistor; microphone sensor; signal-to-noise ratio; Electrons; Feedback circuits; High power amplifiers; Power amplifiers; Resistors; Signal to noise ratio; Switched capacitor circuits; Transducers; Tunneling; Voltage;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1692800
