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

Mingyang Gong1, Haichun Zhang1, Zhenglin Liu1

  • 1School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.

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|September 9, 2020
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Summary
This summary is machine-generated.

This study introduces an improved short-range-controlled communication (RCC) system using subscriber identity module (SIM) cards for near-field payments. The enhanced design significantly boosts low-frequency (LF) communication distance, even in metallic phones.

Keywords:
low-frequency circuitsrail-to-rail amplifierrange-controlled communication

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Area of Science:

  • Electrical Engineering
  • Computer Science

Background:

  • Short-range-controlled communication (RCC) systems, utilizing subscriber identity module (SIM) cards, are proposed as alternatives to near-field communication (NFC) for payment applications.
  • Current RCC systems face compatibility challenges, particularly with low-frequency (LF) communication distances being less than 0.5 cm in phones with metallic shells.

Purpose of the Study:

  • To propose an improved LF communication system design for RCC to overcome existing compatibility issues and enhance communication range.
  • To develop a novel LF receiver chip and an LF-HF communication protocol for more robust near-field payment applications.

Main Methods:

  • Design of an improved LF transmitter circuit, LF receiver chip, and LF-HF communication protocol.
  • The LF receiver chip incorporates a rail-to-rail amplifier and a self-correcting clock recovery differential Manchester decoder.
  • Fabrication of the LF receiver chip using 0.18 μm CMOS technology (die size: 1.05 mm × 0.9 mm, current consumption: 41 μA).

Main Results:

  • The improved RCC system demonstrates enhanced compatibility compared to existing systems.
  • Experimental results show a significant increase in LF communication distance, reaching 4.2 cm even in phones with completely metallic shells.
  • The new LF receiver chip overcomes limitations related to accurate gain and high system clock requirements.

Conclusions:

  • The proposed improved LF communication system design effectively addresses compatibility issues in RCC systems.
  • The enhanced RCC system offers a viable solution for near-field payment applications, providing a greater communication range, especially in challenging metallic environments.
  • The developed LF receiver chip is power-efficient and suitable for integration into mobile devices.