A low power low inaccuracy linearity-compensated temperature sensor for attachable medical devices

In this paper, an accurate, low power CMOS temperature sensor for attachable medical devices (AMDs) is presented. The proposed temperature sensor consists of a high-slope proportional to absolute temperature (PTAT) current and reference voltage generator, a current controlled relaxation oscillator (ICRO), a digital counter, and a reference clock generator. By adopting a temperature conversion linearity compensation technique, simulation results show -0.10 °C ~ +0.13°C temperature inaccuracy in a range of 20°C ~ 50°C with a 100 samples/s sampling rate. The presented sensor dissipates 2uW under 1.2-V supply in a 0.13um CMOS technology.