Low-power and accurate operation of a CMOS smart temperature sensor based on bipolar devices and Σ̄ A/D converter

Author

Aita, André L. ; Makinwa, Kofi A A

Author_Institution

Fed. Univ. of Santa Maria, Santa Maria

fYear

2007

fDate

2-5 July 2007

Firstpage

133

Lastpage

136

Abstract

Due to the trend towards low power operation, as in autonomous systems where power constraints are very high, sensors are increasingly being required to dissipate very low power (few microwatts). In this paper, a low-power version of a smart temperature sensor in 0.7 mum CMOS technology is presented. Based on accuracy requirements, a minimum biasing current I_bias for the sensor´s bipolar core is determined. Measurement results for I_bias = 250 nA and C_S = 1.25 pF (ADC sampling capacitor) are shown. An inaccuracy below plusmn0.15degC from -55degC to 125degC is achievable with a two-point calibration.

Keywords

CMOS integrated circuits; intelligent sensors; sigma-delta modulation; temperature sensors; CMOS smart temperature sensor; SigmaDelta A/D converter; bipolar devices; low-power version; size 0.7 mum; temperature -55 degC to 125 degC; CMOS technology; Capacitors; Circuits; Instruments; Intelligent sensors; Laboratories; Power dissipation; Sampling methods; Temperature sensors; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Research in Microelectronics and Electronics Conference, 2007. PRIME 2007. Ph.D.

Conference_Location

Bordeaux

Print_ISBN

978-1-4244-1000-2

Electronic_ISBN

978-1-4244-1001-9

Type

conf

DOI

10.1109/RME.2007.4401829

Filename

4401829