Title :
Evaluation of low-voltage CMOS differential amplifier for smartphone sensing
Author :
Kawamura, Kei ; Matsumoto, Yuki
Author_Institution :
Dept. of Appl. Physic & Physico-Inf., Keio Univ., Yokohama, Japan
Abstract :
The purpose of this study is to design a low voltage differential amplifier circuit driven by the audio interface to realize the sensing device without external power supply. The pseudo-differential amplifier was designed using a inverter-based subtracting circuit with 0.18μm standard CMOS process. The maximum differential gain was measured as 51.4dB at 1V supply voltage, and the CMRR was 45.1dB. The input offset temperature drift is 1.5μV/ "C. In addition, the simulation was carried out for the sensing circuit in the smartphone configuration.
Keywords :
CMOS analogue integrated circuits; differential amplifiers; low-power electronics; sensors; smart phones; CMRR; differential gain; gain 51.4 dB; inverter-based subtracting circuit; low-voltage CMOS differential amplifier circuit; pseudodifferential amplifier; size 0.18 mum; smartphone sensing device; voltage 1 V; CMOS integrated circuits; Differential amplifiers; Inverters; Operational amplifiers; Sensors; Temperature measurement; Voltage measurement;
Conference_Titel :
Sensors, 2012 IEEE
Conference_Location :
Taipei
Print_ISBN :
978-1-4577-1766-6
Electronic_ISBN :
1930-0395
DOI :
10.1109/ICSENS.2012.6411458
