Dual-mode wide-range linear CMOS interface circuit for resistive sensors

Author

Sung-Woo Kim ; Won-Jin Eom ; Jaehyouk Choi ; Jae Joon Kim

Author_Institution

Sch. of Electr. & Comput. Eng., Ulsan Nat. Inst. of Sci. & Technol., Ulsan, South Korea

Volume

50

Issue

22

fYear

2014

fDate

10 23 2014

Firstpage

1575

Lastpage

1577

Abstract

A dual-mode adaptive method to provide a wide-range linear sensing characteristic over various resistive sensors is presented. A high-R mode acts as a resistance-to-digital converter without an analogue-to-digital converter (ADC), and a low-R mode utilises an adaptive current source to keep the required ADC resolution below 8 bits. A prototype of the dual-mode sensor interface was fabricated in a 0.18 μm CMOS process, and its measured coverage of sensor resistance was from 750 to 1.2 MΩ. The power dissipation with a 1.8 V supply was 2.6-3.1 μW in the high-R mode and 0.31-2.1 mW in the low-R mode.

Keywords

CMOS integrated circuits; analogue-digital conversion; sensors; ADC; RDC; adaptive current source; analogue-to-digital converter; dual-mode adaptive method; dual-mode sensor interface; dual-mode wide-range linear CMOS interface circuit; high-R mode; power 2.6 muW to 3.1 muW; power dissipation; resistance 750 kohm to 1.2 Mohm; resistance-digital converter; resistive sensors; size 0.18 mum; voltage 1.8 V; wide-range linear sensing;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2014.1411

Filename

6937277