Title :
A low power capacitance to pulse width converter for integrated sensors
Author :
Bruschi, P. ; Nizza, N. ; Dei, M. ; Barillaro, G.
Author_Institution :
Dipt. di Ing. dell´´Inf., Univ. di Pisa, Pisa
Abstract :
An interface circuit for integrated capacitive sensors with pulse width modulated output is presented. The circuit is based on an original architecture implementing offset and low frequency noise cancellation by means of chopper modulation. Electrical simulations, performed on a prototype designed using 0.32 mum/ 3.3 V CMOS devices, showed that a sensitivity to temperature lower than 10 ppm/degC with a power consumption of 66 muW can be obtained with this approach.
Keywords :
capacitive sensors; convertors; chopper modulation; integrated capacitive sensor; interface circuit; low power capacitance; noise cancellation; pulse width converter; pulse width modulated output; Capacitance; Capacitive sensors; Choppers; Circuit simulation; Low-frequency noise; Pulse circuits; Pulse width modulation; Pulse width modulation converters; Space vector pulse width modulation; Virtual prototyping;
Conference_Titel :
Circuit Theory and Design, 2007. ECCTD 2007. 18th European Conference on
Conference_Location :
Seville
Print_ISBN :
978-1-4244-1341-6
Electronic_ISBN :
978-1-4244-1342-3
DOI :
10.1109/ECCTD.2007.4529548
