Title :
Applying Effective Dynamic Frequency Scaling Method in Contactless Smart Card
Author :
Wang, Mingyu ; Min, Hao
Author_Institution :
State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China
Abstract :
A creative dynamic frequency scaling method in contactless smart card is presented for the first time. A low power magnetic field detection circuit, a simple load detection circuit, the quick load comparator and the simple clock switch scheme in the method are also presented. The test result shows that the longest communication distance is improved from 6 to 8 cm compared to the same contactless smart card (CSC) chip using the fixed frequency divided by 4 and the transaction time is saved by 18% in average, compared to the same CSC chip using the fixed frequency divided by 8.
Keywords :
comparators (circuits); magnetic field effects; power aware computing; smart cards; CSC chip; communication distance; contactless smart card chip; creative dynamic frequency scaling method; low power magnetic field detection circuit; quick load comparator; simple clock switch scheme; simple load detection circuit; transaction time; Clocks; Detectors; Frequency conversion; Smart cards; Communication distance; contactless smart card; dynamic frequency scaling (DFS); load detection circuit; low power; transaction time;
Journal_Title :
Very Large Scale Integration (VLSI) Systems, IEEE Transactions on
DOI :
10.1109/TVLSI.2011.2164560