Title :
A low-power integrated circuit for interfacing a capacitive micromachined ultrasonic transducer (CMUT) based resonant gas sensor
Author :
M. Kumar;C. Seok;M. M. Mahmud;X. Zhang;O. Oralkan
Author_Institution :
Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC, USA
Abstract :
In this work we present a complete end-to-end interface for a capacitive micromachined ultrasonic transducer (CMUT) intended for low-power gas sensing applications. A prototype chip was designed in a 0.18-μm BiCMOS process. Different blocks (a BJT-based Colpitts oscillator, an inverter-based oscillator, a sine-to-square wave converter, a digital frequency counter, and a parallel-to-serial converter) required for the complete system are discussed, designed, and tested for their standalone performance. Consequently, a complete system interfaced with a 3.6-MHz CMUT and providing a digital frequency output is presented. With duty cycling for one measurement per minute the system consumed 10 μW power.
Keywords :
"Oscillators","Radiation detectors","Inverters","Logic gates","Frequency measurement","Resonant frequency"
Conference_Titel :
SENSORS, 2015 IEEE
DOI :
10.1109/ICSENS.2015.7370639