Temperature Sensor IC Design for Intracranial Monitoring Device

Authors: Wai Pan Chan, Minkyu Je

Abstract:

A precision CMOS chopping amplifier is adopted in this work to improve a CMOS temperature sensor high sensitive enough for intracranial temperature monitoring. An amplified temperature sensitivity of 18.8 ± 3*0.2 mV/oC is attained over the temperature range from 20 oC to 80 oC from a given 10 samples of the same wafer. The analog frontend design outputs the temperature dependent and the temperature independent signals which can be directly interfaced to a 10 bit ADC to accomplish an accurate temperature instrumentation system.

Keywords: Chopping, analog frontend, CMOS temperature sensor, traumatic brain injury (TBI), intracranial temperature monitoring.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1077521

References:

[1] C.S. Rumana, S.P. Gopinath, M. Uzura, A.B. Valadka, and C.S. Robertson, "Brain temperature exceeds systemic temperature in headinjured patients," Crit Care Med., vol. 26, 1998, pp.562-567.
[2] C. Childs, "The Role of Temperature in the Damaged Brain," Raised Human Brain Temperature Good or Bad After Traumatic Brain Injury? Symposium and Workshop, The University of Manchester, 2008.
[3] W.P. Chan, and Minkyu Je, "A Review of CMOS Multimodal Neuromonitoring Sensors and Systems," Integrated Circutis (ISIC) 2011, pp. 416-419.
[4] M.A.P. Pertijs, K.A.A. Makinwa, and J.J. Huijsing, "A CMOS Smart Temperature Sensor With a 3¤â Inaccuracy of ┬▒0.1oC From -55 oC to 125 oC," Solid-State Circuits Journal of., vol. 40, 2005, pp. 2805-2814.
[5] M.A.P. Pertijs, and J.J. Huijsing, Precision Temperature Sensors in CMOS Technology, Springer, 2006.
[6] C.C. Enz, E.A. Vittoz, and F. Krummenacher, "A CMOS Chopping Amplifier," Solid-State Circuits, IEEE Journal of, vol. 22, pp. 335-342, 1987.