Title :
Micropower CMOS temperature sensor with digital output
Author :
Bakker, Anton ; Huijsing, Johan H.
Author_Institution :
Inst. for Microelectron. & Submicron Technol., Delft Univ. of Technol., Netherlands
fDate :
7/1/1996 12:00:00 AM
Abstract :
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
Keywords :
CMOS integrated circuits; calibration; digital readout; electric sensing devices; intelligent sensors; mixed analogue-digital integrated circuits; sigma-delta modulation; temperature measurement; temperature sensors; -40 to 120 C; 2.2 V; 7 muW; calibration; digital output; low-power consumption; micropower CMOS temperature sensor; sigma-delta converter; smart temperature sensor; standard CMOS process; substrate bipolar transistor sensor; CMOS process; Calibration; Circuits; Delta-sigma modulation; Interference; Measurement standards; Power supplies; Switches; Temperature distribution; Temperature sensors;
Journal_Title :
Solid-State Circuits, IEEE Journal of
