A Non-Interruptive Link-Variation Monitoring Circuit for Wireless Sensor Applications

Author

Kim, Stephen T. ; Choi, Jaehyouk ; Chae, Kwanyeob ; Beck, Sungho ; Kim, Seong-Hyok ; Bien, Franklin ; Lee, Chang-Ho ; Lim, Kyutae ; Laskar, Joy ; Tentzeris, Manos M.

Author_Institution

Sch. of ECE, Georgia Inst. of Technol., Atlanta, GA, USA

Volume

21

Issue

12

fYear

2011

Firstpage

691

Lastpage

693

Abstract

As wireless sensor devices are usually deployed where the operating environment changes unpredictably, the ability to evaluate the variation in the wireless link is required for reliable and efficient operations. In this paper, a novel link-variation-to-digital-converter (LDC) that provides real-time assessments on the link variations is proposed. Due to its unique structure, the proposed LDC can adjust the resolution of the output data and does not interrupt the original system functionality. A wireless power receiver prototype with a proposed circuit is implemented in CMOS 0.18 μm with an active area of 500 μm-by-20 μm. Measurements of the prototype show that link-variations due to mismatches in the resonant matching condition as well as physical misalignments can be successfully evaluated with the proposed LDC.

Keywords

CMOS integrated circuits; convertors; wireless sensor networks; CMOS; LDC; link-variation-to-digital-converter; noninterruptive link-variation monitoring circuit; original system functionality; physical misalignments; resonant matching condition; size 0.18 mum; wireless link; wireless power receiver prototype; wireless sensor applications; Capacitors; Inductors; Magnetic hysteresis; Prototypes; Receivers; Wireless communication; Wireless sensor networks; Adaptive matching; link variation; resonant matching; wireless power transmission;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2011.2170828

Filename

6070987