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Micropower CMOS temperature sensor with digital output

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2 Author(s)
Bakker, A. ; Inst. for Microelectron. & Submicron Technol., Delft Univ. of Technol., Netherlands ; Huijsing, J.H.

A CMOS smart temperature sensor with digital output is presented. It consumes only 7 μW. To achieve this extremely low-power consumption, the system is equipped with a facility that switches off the supply power after each sample. The circuit uses substrate bipolars as a temperature sensor. Conversion to the digital domain is done by a sigma-delta converter which makes the circuit highly insensitive to digital interference. The complete system is realized in a standard CMOS process and measures only 1.5 mm2. In the temperature range from -40 to +120°C, the inaccuracy is ±1°C after calibration at two temperatures. The circuit operates at supply voltages down to 2.2 V

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:31 ,  Issue: 7 )