Abstract
In this paper, a new high-precision, pressure sensor for sensing gas molecules using a controllable voltage-mode instrumentation amplifier (VMIA) in carbon nanotube field-effect transistor (CNTFET) technology is designed. The sensing mechanism is based on the applied force by Oxygen atoms on the surface of the carbon nanotube (CNT), which is considered as a movable electrode of sensing capacitor. The sensing mechanism is simulated in ANSYS which justifies the variations of sensing capacitance, while the sensor’s output voltage is applied to an accurate instrumentation amplifier (IA) via a switched-capacitor sensor driver. Therefore, due to the controllability of the transconductance and gain parameters of a CNTFET, the IA circuit provides a constant and controllable differential gain of up to 52 dB in a flat −3dB bandwidth of up to 3.6 MHz, which provides a tunable common-mode rejection ratio (CMRR) of up to 121 dB in a 1.8 GHz flat, −3dB frequency bandwidth. Moreover, due to the use of the differential pair stage, the total harmonic distortion (THD) value is obtained less than 0.67%. Finally, the proposed IA circuit consumes only 45.1 µW with a 22.52 nV/√Hz equivalent input referred noise value at ±0.5 V supply.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: AEU - International Journal of Electronics and Communications
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
