Title :
A wide temperature range micropower sensor interface circuit
Author :
Geeter, B. De ; Nys, O. ; Bardyn, J.-P.
Author_Institution :
CSEM, Centre Suisse d´´Electronique et de Microtechnique SA, Jaquet Droz 1, CH-2007 Neuchâtel, Switzerland. Phone: +41.38.205.111, Fax: +.41.38.205.770, E-mail: bart.degeeter@csemne.ch
Abstract :
A capacitive pressure sensor interface circuit featuring micropower consumption is presented. The sensitivity to leakage currents has been reduced, allowing operation at temperatures up to 130°C. Special attention has been paid to minimise aliasing in the sampled interface. An optimal combination of contradictory requirements on power consumption, temperature range and sampling speed was obtained by a very careful system and block design. An 11 bit resolution is guaranteed in the temperature range of ¿40°C up to 100°C. It may slowly decay above 100°C but ensures at least 5 bit at 130°C. The power consumption at room temperature is smaller than 4¿A from a 2.4V to 4V battery.
Keywords :
Capacitive sensors; Capacitors; Circuits; Energy consumption; Frequency; Leakage current; Sampling methods; Sensor systems; Temperature distribution; Temperature sensors;
Conference_Titel :
Solid-State Circuits Conference, 1996. ESSCIRC '96. Proceedings of the 22nd European
Conference_Location :
Neuchatel, Switzerland
Print_ISBN :
2-86332-197-8
