Title :
A chopper modulated low noise instrumentation amplifier for MEMS thermal sensors interfacing
Author :
Butti, Federico ; Bruschi, Paolo ; Piotto, Massimo
Author_Institution :
Dept. of Inf. Eng., Univ. of Pisa, Pisa, Italy
Abstract :
A CMOS instrumentation amplifier for interfacing integrated thermal sensors is proposed. It is based on a Gm-C 2nd order low pass filter, and exploits chopper modulation to improve its performances in terms of offset and low frequency noise. An input noise level of 10 nV/sqrt(Hz) and a current consumption of a few hundred of μA have been obtained by means of a careful design. Moreover, an original technique of input and feedback port swapping improves the amplifier gain precision. A prototype has been designed with the BCD6s STMicroelectronics process, and its functionality has been demonstrated by means of electrical simulations.
Keywords :
CMOS analogue integrated circuits; choppers (circuits); instrumentation amplifiers; low noise amplifiers; low-pass filters; microsensors; BCD6s STMicroelectronics process; CMOS instrumentation amplifier; Gm-C 2nd order low pass filter; MEMS thermal sensors interface; amplifier gain precision; chopper modulated low noise instrumentation amplifier; chopper modulation; current consumption; electrical simulations; feedback port swapping; frequency noise; input noise level; integrated thermal sensors; Choppers; Instruments; Logic gates; Modulation; Noise; Thermal noise; Thermal sensors; chopper modulation; instrumentation amplifier; integrated thermal sensors;
Conference_Titel :
Ph.D. Research in Microelectronics and Electronics (PRIME), 2011 7th Conference on
Conference_Location :
Trento
Print_ISBN :
978-1-4244-9138-4
Electronic_ISBN :
978-1-4244-9136-0
DOI :
10.1109/PRIME.2011.5966235
