Abstract
Power consumption and communication distance have become crucial challenges for SIM card RFID (radio frequency identification) applications. The combination of long distance 2.45 GHz radio frequency (RF) technology and low power 2 kHz near distance communication is a workable scheme. In this paper, an ultra-low frequency 2 kHz near field communication (NFC) method suitable for SIM cards is proposed and verified in silicon. The low frequency transmission model based on electromagnetic induction is discussed. Different transmission modes are introduced and compared, which show that the baseband transmit mode has a better performance. The low-pass filter circuit and programmable gain amplifiers are applied for noise reduction and signal amplitude amplification. Digital-to-analog converters and comparators are used to judge the card approach and departure. A novel differential Manchester decoder is proposed to deal with the internal clock drift in range-controlled communication applications. The chip has been fully implemented in 0.18 µm complementary metal-oxide-semiconductor (CMOS) technology, with a 330 µA work current and a 45 µA idle current. The low frequency chip can be integrated into a radio frequency SIM card for near field RFID applications.
Highlights
As communication and computing performance evolves, smart phones with various types of sensors have the potential to become identification cards and credit cards
The 13.56 MHz near field communication (NFC) technology based on ISO 14443 protocol is the popular scheme for mobile phones, and this uses the NFC chip, subscriber identity module (SIM) cards, and the single wire protocol (SWP) interface [3,7]
This paper presents a strategy to tackle the dilemma, and an improved constitution of Radio frequency identification (RFID)
Summary
As communication and computing performance evolves, smart phones with various types of sensors have the potential to become identification cards and credit cards. The metallic shells of phones can cause a frequency shift for 13.56 MHz technology and a reduction of the field intensity, which can affect the communication quality for NFC devices [12,13]. To solve these problems, 2.45 GHz radio frequency (RF). 13.56 MHz is fairly large and is difficult to integrate into SIM cards, especially nano-SIMs. In addition, the metallic shells and card slots of mobile phones can affect the communication quality of 13.56 MHz. a low power near-distance communication chip is discussed and customized.
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