scholarly journals An Improved Design and Implementation of a Range-Controlled Communication System for Mobile Phones

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4997
Author(s):  
Mingyang Gong ◽  
Haichun Zhang ◽  
Zhenglin Liu
Keyword(s):  
Communication System ◽  
Near Field ◽  
Low Frequency ◽  
Cmos Technology ◽  
Clock Recovery ◽  
Current Consumption ◽  
System Clock ◽  
Communication Distance ◽  
Communication System Design ◽  
Improved Design

The Short-range-controlled communication system (RCC) based on a subscriber identity module (SIM) card is a replacement for the standard near-field communication (NFC) system to support near-field payment applications. The RCC uses both the low-frequency (LF) and high-frequency (HF) wireless communication system. The RCC communication distance is controlled under 10 cm. However, current RCCs suffer from compatibility issues, and the LF communication distance is lower than 0.5 cm in some phones with completely metallic shells. In this paper, we propose an improved LF communication system design, including an LF transmitter circuit, LF receiver chip, and LF-HF communication protocol. The LF receiver chip has a rail-to-rail amplifier and a self-correcting clock recovery differential Manchester decoder, which do not have the limitations of accurate gain and high system clock. The LF receiver chip is fabricated in a 0.18 μm CMOS technology platform, with a die size of 1.05 mm × 0.9 mm and current consumption of 41 μA. The experiments show that the improved RCC has better compatibility, and the communication distance reaches to 4.2 cm in phones with completely metallic shells.

High-precision high-sensitivity clock recovery circuit for a mobile payment application

2011 ◽  
Vol 32 (5) ◽  
pp. 055007 ◽  
Author(s):  
Lichong Sun ◽  
Wenliang Ren ◽  
Na Yan ◽  
Hao Min
Keyword(s):  
High Precision ◽  
High Sensitivity ◽  
Clock Recovery ◽  
Mobile Payment

Performance and scalability of an all-optical clock recovery figure eight laser

1996 ◽  
Vol 8 (1) ◽  
pp. 55-57 ◽  
Author(s):  
L.E. Adams ◽  
E.S. Kintzer ◽  
J.G. Fujimoto
Keyword(s):  
Optical Clock ◽  
Clock Recovery ◽  
All Optical ◽  
Optical Clock Recovery
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