Date of Award

2009

Publication Type

Master Thesis

Degree Name

M.A.Sc.

Department

Electrical and Computer Engineering

First Advisor

Chunhong Chen

Keywords

Applied sciences

Rights

info:eu-repo/semantics/openAccess

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Abstract

Automotive sensors implemented in radio frequency identification (RFID) tags can correct data errors by using BCH (Bose-Chaudhuri-Hocquenghem) decoder, for which Chien search is a computation-intensive key step. Existing low power approaches have drastically degrading performance for multiple-bit-correcting codes. This thesis presents a novel approach of using register-transfer-level (RTL) power management in the search process, leading to significant power savings for BCH codes with higher correction capability. An example for the (255, 187, 9) BCH code has been implemented in 0.18μm CMOS technology.

We also consider ways of conserving power for the sole power harvester on a passive tag – the rectifier. With ST CMOS 90nm technology, a three-stage differential-drive CMOS rectifier is designed by using a new transistor scaling method and a piece-wise linear matching technique. For the standard 915MHz band, simulation indicates high power conversion efficiency (PCE) of 74% and a significantly increased output power of 30.3μW at 10 meters.

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