12-b Enhanced Input Range On-Chip Quasi-Digital Converter With Temperature Compensation

Author

Azcona, C. ; Calvo, B. ; Medrano, N. ; Bayo, A. ; Celma, S.

Author_Institution

Electron. Design Group I3A, Univ. of Zaragoza, Zaragoza, Spain

Volume

58

Issue

3

fYear

2011

fDate

3/1/2011 12:00:00 AM

Firstpage

164

Lastpage

168

Abstract

This brief presents a monolithic 1.8-V 0.18-μm CMOS temperature-compensated voltage-to-frequency converter for sensor read-out interfaces in wireless sensor network applications. Measurement results show that the proposed converter features are suitable for an output frequency span of 2 MHz with an input voltage range of 0.1-1.6 V. This converter presents a relative error below 4.8% and a linearity error below 0.017% (i.e., 12 b) over the whole frequency span for a range of ( -40°C, + 85°C). Power consumption is 0.423 mW (20 nW in sleep mode), and it occupies an active area of 137 μm x 100 μm.

Keywords

CMOS integrated circuits; analogue-digital conversion; compensation; wireless sensor networks; frequency 2 MHz; monolithic CMOS voltage-to-frequency converter; on-chip quasidigital converter; power 0.43 mW; power 20 nW; sensor read-out interfaces; size 0.18 mum; temperature compensation; voltage 0.1 V to 1.6 V; voltage 1.8 V; wireless sensor network applications; CMOS integrated circuits; Capacitors; Converters; Resistors; Temperature measurement; Transistors; Wireless sensor networks; CMOS mixed integrated circuits; low-voltage low-power; sensor interface; smart sensors; voltage-to-frequency converter (VFC); wireless sensor network (WSN);

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2011.2111550

Filename

5730477